Patent Publication Number: US-11642892-B2

Title: Member including pad electrode, ink cartridge, recording apparatus

Description:
This application is a division of application Ser. No. 16/645,445 filed Mar. 6, 2020, currently pending, which was a national stage filing under 35 U.S.C. § 371 of international application No. PCT/JP2018/038753 filed Oct. 11, 2018, and claims priority under 35 U.S.C. § 119 from Japan application No. 2017-199622 filed in Japan on Oct. 13, 2017 and from Japan application No. 2018-190401 filed in Japan on Oct. 5, 2018; the content of all of which are incorporated herein by reference as if set forth in full. 
    
    
     TECHNICAL FIELD 
     The present invention relates to a member including a pad electrode, an ink cartridge, and a recording apparatus capable of mounting the ink cartridge. 
     BACKGROUND ART 
     As a recording apparatus such as an inkjet printer and a laser beam printer, there is a recording apparatus to which a member (for example, an ink cartridge) including an electrode portion provided with a pad electrode can be mounted. When such a member is mounted on the recording apparatus, the pad electrode of the member is in a state in which it is electrically connected to the electric connection portion on the recording apparatus side. 
     Japanese Laid-open Patent Application No. 2008-273173 describes an ink cartridge provided with a circuit board (pad electrode) including a memory element. When this ink cartridge is mounted to the recording apparatus, the connection terminal of the recording apparatus and the pad electrode of the ink cartridge are brought into the electrical connection with each other. 
     SUMMARY OF THE INVENTION 
     Representative structures are as follows. 
     A member mountable to a mounting portion provided with an ink receiving tube and a plurality of electrical connecting portions, said member comprising a first portion including an outwardly facing surface and provided with an inserting portion into which the ink receiving tube is capable of being inserted; a second portion opposite from said first portion; and a third portion connecting said first portion and said second portion with each other and provided with a plurality of pad electrodes electrically connectable with said electrical connecting portions, wherein said member is mountable to the mounting portion by being inserted into said mounting portion in an inserting direction with said first portion at a leading side, and wherein said pad electrodes are electrically connectable with said electrical connecting portions by being moved in a direction different from the inserting direction. 
     Further features of the present description will be apparent from the following description of the example with reference to the attached drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is an illustration showing a structure of an ink jet printer. 
       Parts (a) and (b) of  FIG.  2    are perspective views illustrating a structure of a mounting portion. 
         FIG.  3    is a perspective view illustrating the structure around the electrical connecting portion of the mounting portion. 
       Parts (a), (b), (c), (d) and (e) of  FIG.  4    are views illustrating a structure around the electrical connecting portion of the mounting portion. 
       Parts (a) and (b) of  FIG.  5    are perspective views illustrating the structure around the electrical connecting portion of the mounting portion. 
       Parts (a), (b), (c) and (d) of  FIG.  6    are views illustrating a structure of an ink cartridge. 
       Parts (a) and (b) of  FIG.  7    are views illustrating a structure of the ink cartridge. 
       Parts (a), (b), (c), (d) and (e) of  FIG.  8    are perspective views illustrating how the ink cartridge is mounted. 
       Parts (a), (b), (c) and (d) of  FIG.  9    are views illustrating how the ink cartridge is mounted. 
         FIG.  10    is a perspective view illustrating a structure of an ink cartridge. 
       Parts (a), (b), (c) and (d) of  FIG.  11    are perspective views illustrating how the ink cartridge is mounted. 
       Parts (a), (b), (c) and (d) of  FIG.  12    are perspective views illustrating how the ink cartridge is mounted. 
       Parts (a), (b), (c), (d), (e), (f), (g) and (h) of  FIG.  13    are illustrations showing an arrangement of pad electrodes. 
         FIG.  14    is a perspective view illustrating a structure of an ink cartridge. 
       Parts (a), (b) and (c) of  FIG.  15    are perspective views illustrating how the ink cartridge is mounted. 
       Parts (a) and (b)  FIG.  16    are views illustrating a state of engagement of a guide portion of an ink cartridge. 
       Parts (a), (b) and (c) of  FIG.  17    are perspective views illustrating a structure of the ink cartridge. 
         FIG.  18    is a view illustrating a structure of pad electrodes of the ink cartridge and the periphery of the guide portion. 
       Parts (a), (b), (c) and (d) of  FIG.  19    are perspective views illustrating how the ink cartridge is mounted. 
       Parts (a), (b), (c) and (d) of  FIG.  20    are views illustrating a structure of the ink cartridge. 
         FIG.  21    is a view illustrating a structure around the electrical connecting portion of the mounting portion. 
       Parts (a), (b), (c) and (d) of  FIG.  22    are perspective views illustrating how the ink cartridge is mounted. 
       Parts (a), (b) and (c) of  FIG.  23    are views illustrating how the ink cartridge is mounted. 
         FIG.  24    is a view illustrating the structure around the electrical connecting portion of the mounting portion. 
       Parts (a), (b), (c) and (d) of  FIG.  25    are views illustrating how the ink cartridge is mounted. 
       Parts (a), (b) and (c) of  FIG.  26    are perspective views illustrating how the ink cartridge is mounted. 
       Parts (a), (b), (c) and (d) of  FIG.  27    are perspective views illustrating how the ink cartridge is mounted. 
       Parts (a), (b) and (c) of  FIG.  28    are perspective views illustrating how the ink cartridge is mounted. 
         FIG.  29    is a view illustrating a structure of a member. 
       Parts (a), (b) and (c) of  FIG.  30    are perspective views illustrating how the member is mounted. 
       Parts (a), (b) and (c) of  FIG.  31    are perspective views illustrating how the member is mounted. 
         FIG.  32    is a perspective view illustrating a structure in which an ink cartridge member is mounted on the member. 
       Parts (a), (b), (c) and (d) of  FIG.  33    are sectional views illustrating how the member and the ink cartridge member is mounted. 
       Parts (a), (b) and (c) of  FIG.  34    are perspective views illustrating a state of mounting the ink cartridge member on the member. 
         FIG.  35    is a sectional view illustrating a structure in which an ink storage bottle is mounted by way of a tube. 
       Parts (a), (b), (c) and (d) of  FIG.  36    are perspective views illustrating a structure of an electrode portion and pad electrodes; 
       Parts (a), (b), (c) and (d) of  FIG.  37    are views illustrating a structure of the electrode portion and the pad electrodes. 
         FIG.  38    is a view illustrating a structure of then electrode portion and the pad electrodes. 
         FIG.  39    is a view illustrating a structure of an ink cartridge. 
     
    
    
     EMBODIMENTS FOR CARRYING OUT THE INVENTION 
     According to the investigation by the inventors of the present invention, when the ink cartridge disclosed in Japanese Laid-open Patent Application No. 2008-273173 is mounted in the recording apparatus, if the mounting force is strong, the contact between the connection terminals of the recording apparatus and the pad electrodes of the ink cartridge may not be good enough in some cases. 
     That is, in the prior art, there is room for improvement on the member (ink cartridges) including the pad electrodes and the recording apparatus to which the member is mounted. 
     In the following, embodiments of the member, the ink cartridge, and the recording apparatus according to the present invention will be specifically described in conjunction with the drawings. Here, each of the following embodiments is a preferable example for carrying out the present invention, and the present invention is not limited to the structures of such examples. In addition, the contents described in each embodiment can be combined with a part or parts of the description content. 
     Embodiment 1 
     First, an example in which an ink jet printer is used as a recording apparatus, and in which an ink cartridge is used as the mountable member will be described. 
     &lt;Recording Apparatus&gt; 
     (Overall Structure) 
     Referring to  FIG.  1   , the overall structure of an inkjet printer  1  (hereinafter referred to as a recording apparatus  1 ) as an example of a recording apparatus will be described  FIG.  1    is an internal structure illustration of the recording apparatus  1 . In  FIG.  1   , a x direction indicates the horizontal direction, a y direction (the direction perpendicular to the sheet of the drawing) indicates the direction in which the discharge openings are arranged in the recording head  8  described later, and the z direction indicates the direction of gravity (vertical direction). Here, the x direction, the y direction and the z direction shown in  FIG.  1    are usable with the same meaning also in the drawings after  FIG.  1   . For example, the x direction, the y direction and the z direction shown in Parts (a) and (b) of  FIG.  2    are directions same as the x direction, the y direction and the direction shown in  FIG.  1   , respectively. 
     The recording apparatus  1  is a multifunction machine including a printing portion  2  and a scanner portion  3  above the printing portion  2 , and various processes relating to a recording operation and a reading operation are individually or in interrelation with the printing portion  2  and the scanner portion  3  can be executed. The scanner portion  3  is equipped with ADF (Automatic Document Feeder) and FBS (Flat Bed Scanner), and it is possible to scan originals automatically fed by the ADF and to read originals placed on the platen of the FBS by the user. Here,  FIG.  1    shows a multifunction peripheral including both the printing unit  2  and the scanner unit  3 , but the scanner unit  3  may not be provided.  FIG.  1    shows a state in which the recording apparatus  1  is in a stand-by state in which neither the recording operation nor the reading operation is carried out. 
     In the printing unit  2 , a first cassette  5 A and a second cassette  5 B for storing a recording material (cut sheet) S are dismountably mounting at a bottom portion of the casing  4  downwardly in the gravity direction. Relatively small recording materials up to A4 size are accommodated in the first cassette  5 A and relatively large recording materials up to A3 size are accommodated in the second cassette  5 B in the form of a flat stack. In the neighborhood of the first cassette  5 A, there is provided a first feeding unit  6 A for separating and feeding the stored recording materials one by one. Similarly, in the neighborhood of the second cassette  5 B, the second feeding unit  6 B is provided. When the recording operation is carried out, the recording material S is selectively fed from one of the cassettes. 
     A feeding roller  7 , a discharge roller  12 , a pinch roller  7   a , a spur  7   b , a guide  18 , an inner guide  19  and a flapper  11  are feeding mechanisms for guiding to feed the recording material S in a predetermined direction. The feeding rollers  7  are disposed on an upstream side and a downstream side of the recording head  8  and are driving rollers driven by a feeding motor (not shown). The pinch roller  7   a  is a driven roller that rotates while nipping the recording material S together with the feeding roller  7 . The discharging roller  12  is a driving roller which is disposed on the downstream side of the feeding roller  7  and is driven by a feeding motor (not shown). The spur  7   b  sandwiches and feeds the recording material S together with the feeding roller  7  and the discharge roller  12  provided on the downstream side of the recording head  8 . 
     The guide  18  is provided in the feeding path of the recording material S and guides the recording material S in a predetermined direction. The inner guide  19  extends in the y direction, has a curved side surface, and guides the recording material S along the side surface. The flapper  11  is for switching the direction in which the recording material S is fed during the duplex recording operation. The discharge tray  13  is for stacking and holding the recording materials S discharged by the discharge roller  12  after completion of the recording operation. 
     The recording head  8  shown in  FIG.  1    is a full-line type ink jet recording head, in which ejection openings for injecting ink in accordance with recording data are arranged in the y direction in  FIG.  1   , and the number of ejection openings are enough to cover width of the recording material S. In addition, it is an inkjet recording head capable of color printing. When the recording head  8  is in the standby position, the ejection opening surface  8   a  of the recording head  8  is capped by the cap unit  10  as shown in  FIG.  1   . When performing the recording operation, the direction of the recording head  8  is changed by the print controller so that the ejection opening surface  8   a  faces the platen  9 . The platen  9  is constituted by a flat plate extending in the y direction, and supports the recording material S on which the recording operation is performed by the recording head  8 , at the back side of the recording material S. 
     The recording head  8  need not necessarily be a full-line type recording head, but may be a serial-scan type recording head that reciprocates in a direction crossing the feeding direction of the recording material S. 
     A mounting portion  14  is a portion to which the ink cartridge is mounted. The mounting portion  14  may be made dismountable from the recording apparatus  1 . Here, in this example, four ink cartridges are mounted on the mounting portion  14 , and these ink cartridges store the four colors of ink to be supplied to the recording head  8 , respectively. The ink supply unit  15  is provided in the middle of a flow path connecting the mounting portion  14  and the recording head  8  and adjusts the pressure and the flow rate of the ink in the recording head  8  to appropriate levels. In addition, in this example, a circulation type ink supply “system” is employed, and the ink supply unit  15  adjusts the pressure of the ink supplied to the recording head  8  and the flow rate of the ink returning from the recording head  8  within appropriate ranges. 
     The maintenance unit  16  includes a cap unit  10  and a wiping unit  17  and operates at a predetermined timing to perform a maintenance operation on the recording head  8 . 
     Here, “ink” as used herein includes any liquid that can be used for image formation or processing of a recording material by being applied to a recording material. Therefore, “ink” as used herein includes any liquid that can be used for recording. In addition, the recording is not limited in particular, and it can be applied to industrial applications and the like. For example, they can be used for biochip production, electronic circuit printing, semiconductor substrate production, and so on. 
     (Mounting Portion) 
     Parts (a) and (b) of  FIG.  2    shows a view of the mounting portion  14  of the recording apparatus  1  of  FIG.  1    as viewed obliquely from above in the direction of gravity, in which the mounting portion  14  is omitted. Part (a) of  FIG.  2    is an illustration showing a state before the ink cartridge is mounted to the mounting portion  14 . Part (b) of  FIG.  2    is an illustration showing a state after the ink cartridge  20  is mounted to the mounting portion  14 . 
     The mounting portion  14  shown in Parts (a) and (b) of  FIG.  2    includes four cylindrical hole forming members  14   a . Each hole forming member  14   a  forms a hole  14   d . The ink cartridge  20  is inserted into the hole  14   d  formed by the hole forming member  14   a  of the mounting portion  14  and mounted to the mounting portion  14  of the recording apparatus. It is not always necessary to provide a plurality of hole forming members  14   a . For example, one hole forming member may include a plurality of holes. It is preferred that the diameter of the hole  14   d  (the dimension measured in the direction perpendicular to the extending direction of the hole  14   d ) is 50 mm or more and 90 mm or less. Here, if the cross-section taken in the direction perpendicular to the extending direction of the hole  14   d  is not a perfect circle, the diameter of the hole  14   d  is assumed to be the circle equivalent diameter. Similarly, in the present specification, the “equivalent diameter” is taken as “diameter” unless otherwise specified. 
     On the back side of the hole forming member  14   a , another hole forming member  14   b  (different member) different from the hole forming member  14   a  is provided. When mounting the ink cartridge, the side where the hole forming member  14   a  is provided is the front side, and the side provided with the hole forming member  14   b  is the rear side. The hole forming member  14   b  is also provided with a hole (not shown in Parts (a) and (b) of  FIG.  2   ), and the hole  14   d  of the hole forming member  14   a  and the hole of the hole forming member  14   b  communicate with each other inside the mounting portion  14 . The ink cartridge  20  is inserted into this communicated hole. Here, the hole forming member  14   a  and the hole forming member  14   b  may not be provided as separate members, and, for example, two hole forming members may be integrated. Examples of materials for forming the hole forming member  14   a  include ABS (acrylonitrile-butadiene-styrene copolymer resin), PPO (modified polyphenylene oxide), HIPS (high impact polystyrene resin), and the like. Materials for forming the hole forming member  14   b  include PE (polyethylene), PP (polypropylene), PPO (modified polyphenylene oxide), and the like. 
     At the opening on the front side of the hole  14   d  of the hole forming member  14   a , an ID recess  14   c  is provided. The ID recess  14   c  is used for roughly aligning the ink cartridge  20  relative to the mounting portion  14  when the ink cartridge  20  is mounted. In Parts (a) and (b) of  FIG.  2   , the circular opening of the hole  14   d  is partially recessed to form the ID recess  14   c.    
     A plurality of electrical connecting portions (not shown in Parts (a) and (b) of  FIG.  2   ) are provided in the mounting portion  14  so as to be in contact with the respective pad electrodes of the ink cartridge and to be electrically connected with the pad electrodes by physical contact therebetween. In Parts (a) and (b) of  FIG.  2   , the electrical connecting portion is provided in the hole forming member  14   b  of the mounting portion  14 . 
       FIG.  3    schematically is an enlarged view of the hole forming member  14   b  around the electrical connecting portion.  FIG.  3    is a view of a cross portion of the mounting portion  14  (hole forming member  14   b ) in a portion surrounded by a portion A in part (a) of  FIG.  2   . Here, in  FIG.  3   , a part of the mounting portion  14  including the hole forming member  14   a  is omitted, for simplicity of illustration. 
     As shown in  FIG.  3   , the hole forming member  14   b  is a tubular member, and a hole  14   f  is formed inside the hole forming member  14   b . The tubular ink receiving tube  21  projects from the rear side surface of the hole  14   f  (the bottom surface of the hole  14   f  formed by the hole forming member  14   b ). The surface on the rear side of the hole  14   f  is circular, and the ink receiving tube  21  projects from a center of the circular surface in a direction (extending direction) perpendicular to the surface. The ink receiving tube  21  is a tube for receiving the ink supplied from the ink cartridge mounted to the mounting portion  14 . The ink receiving tube  21  is connected to the recording head of the recording apparatus by way of the ink flow path, and supplies the ink received from the ink cartridge to the recording head. One ink receiving tube corresponds to one color ink. Therefore, it is preferable to provide ink receiving tubes for the ink color used, respectively. Examples of materials forming the ink receiving tube  21  include SUS (stainless steel), PPO (modified polyphenylene oxide) and the like. It is preferred that the diameter of the ink receiving tube  21  (the diameter in the cross-section perpendicular to the extending direction of the ink receiving tube  21 ) is 2 mm or more and 5 mm or less. Further preferably, it is 3 mm or more and 4 mm or less. Here, it is preferred that the diameter of the hole  14   f  (the diameter measured in the direction perpendicular to the extending direction of the hole  14   f ) is 20 mm or more and 30 mm or less. It is preferred that the diameter of hole  14   f  is smaller than the diameter of hole  14   d.    
     As shown in  FIG.  3   , the mounting portion  14  is provided with a plurality of electrical connecting portions  22 . The electrical connecting portion  22  may be in the form of a connector pin or the like. The electrical connecting portion  22  is provided in the electrical connecting portion peripheral portion  23  which is a part of the mounting portion  14 . Copper alloy (gold-plated) or the like can be used as a material for forming the electric connecting portion  22 . Examples of materials forming the electrical connecting portion peripheral portion  23  include ABS (acrylonitrile-butadiene-styrene copolymer resin), PC (polycarbonate), and the like. 
     The plurality of electrical connecting portions  22  are interposed between positioning walls  23   a ,  23   b  of the electrical connecting portion peripheral portion  23 . The positioning walls  23   a  and  23   b  are opposed to each other with the plurality of electric connecting portions  22  interposed therebetween and perform the function of a wall for positioning the ink cartridge when mounting the ink cartridge as will be described hereinafter. As the material for forming the positioning walls  23   a  and  23   b , PPO (modified polyphenylene oxide), ABS (acrylonitrile-butadiene-styrene copolymer resin), SUS (stainless steel) and the like can be used. Here, the electrical connecting portion peripheral part  23  may be dismountably from the mounting portion  14 . In addition, the electrical connecting portion peripheral portion  23  may not be provided in the hole forming member  14   b , but may be provided separately from the hole forming member  14   b.    
     Next, the structure of the electrical connecting portion  22  and the electrical connecting portion peripheral portion  23  will be described in more detail. First, the view of the periphery of the electrical connection portion  22  in the direction of the arrow An in  FIG.  3    is shown in part (a) of  FIG.  4   . The direction of the arrow An in  FIG.  3    is the direction (z direction) heading from the lower side to the upper side with respect to the direction of gravity in the attitude of using the recording apparatus. The attitude of using the recording apparatus is the attitude in which the recording apparatus is placed when recording is carried out by the recording apparatus, and it is the attitude shown in  FIG.  1   . Here, “gravity direction” in this specification means the direction of gravity in the attitude in which the recording apparatus is used unless otherwise specified. In the direction of the arrow A, the hole forming member  14   b  and the electrical connecting portion  22  are visible. As will be described hereinafter, the hole forming member  14   b  visible here can support the pad electrode of the ink cartridge and can restrict the movement of the pad electrode in the vertical direction (gravity direction). By this restriction of movement, the hole forming member  14   b  serves as a supporting member for stabilizing the mounting of the ink cartridge. As shown in part (a) of  FIG.  4   , as viewed in the direction of arrow A, the hole forming member  14   b  covers a part of the electric connecting portion  22 . Here, the hole forming member  14   b  is not limited to the form covering a part of the electric connecting portion  22  as shown here, but it may be formed so as not to cover the electric connecting portion  22  is viewed in the direction of part (a) of  FIG.  4   . 
     Next, the periphery of the electrical connecting portion  22  as viewed in the direction of the arrow B in  FIG.  3    is shown in part (b) of  FIG.  4   . The direction of the arrow B in  FIG.  3    is the direction from the upper side to the lower side with respect to the direction of gravity. In addition, the periphery of the electrical connecting portion  22  as viewed in the direction of the arrow C in  FIG.  3    is shown in part (c) of  FIG.  4   . The direction of the arrow C is an oblique direction from the upper side to the lower side with respect to the direction of gravity. In the direction of the arrow B and the direction of the arrow C, the electrical connecting portion  22  is not seen, and the connector  22   a  extending toward the inside of the recording apparatus from the electrical connecting portion  22  is seen. The connector  22   a  extends from the electrical connecting portion  22  and has the function of wiring that enables the electrical connecting portion  22  to be electrically connected to the inside of the recording device. As a material for forming the connector  22   a , copper alloy (gold plating) and the like are available. 
     A cross-section taken along line A-A′ of part (b) of  FIG.  4    is shown in part (d) of  FIG.  4   . As described above, the ink receiving tube  21  projects from the rear side surface of the hole  14   f  formed by the hole forming member  14   b . In addition, the plurality of electrical connecting portions  22  are interposed between the positioning walls  23   a ,  23   b.    
     Next,  FIG.  4  ( e )  shows the periphery of the electrical connecting portion  22  of the mounting portion as viewed in the direction of the arrow D in  FIG.  3   . The direction of the arrow D in  FIG.  3    is the direction from the front side to the back side when mounting the ink cartridge to the mounting portion. In addition, it is also the extending direction of the hole (hole  14   d  and hole  14   f ) formed by the hole forming member  14   a  and the hole forming member  14   b . Furthermore, it is the y direction, the horizontal direction perpendicular to the direction of gravity. As viewed in the direction of arrow D, the ink receiving tube  21  is visible on the rear side of the hole  14   f  formed by the hole forming member  14   b . In addition, the positioning wall  23   a , and the positioning wall  23   b  as another positioning wall arranged so as to partially overlap the positioning wall  23   a  on the far side of the positioning wall  23   a  are seen. Here, the hole forming member  14   a  is omitted, but when the hole forming member  14   a  is provided, the hole forming member  14   a  is seen in front of the hole forming member  14   b . And, the ink receiving tube  21  is seen on the rear side of the hole formed by connecting the holes (the hole  14   d  and the hole  14   f ) formed by the hole forming member  14   a  and the hole forming member  14   b . To the ink receiving tube  21 , the ink cartridge is inserted from the front side to the rear side (y direction) along the inserting direction. 
     Parts (a) and (b) of  FIG.  5    is a view of the periphery of the electric connecting portion  22  as viewed another angular direction. Part (a) of  FIG.  5    shows the periphery of the electrical connecting portion  22  as viewed in the direction of the arrow E in  FIG.  3   . Part (b) of  FIG.  5    shows the periphery of the electrical connecting portion  22  as viewed in the direction of the arrow F in  FIG.  3   . The arrow E direction and the arrow F direction obliquely extend from the lower side to the upper side in the gravy direction around the electric connecting portion  22 . As described in part (a) of  FIG.  4   , a part of the electrical connecting portion  22  of the electrical connecting portion  22  is covered with the hole forming member  14   b  in the downward direction of the electrical connecting portion  22 . In addition, in Parts (a) and (b) of  FIG.  5   , the four electrical connecting portions  22  are all in the form of connector pins. Each connector pin has a triangular shape. The connector pin is deformed so that any point of the connector pin, particularly the apex of the triangle contacts the pad electrode of the ink cartridge to be collapsed, by which an electrical contact point is provided. The electrical contact point can be thought of as the center of gravity position (the position of the center of gravity of the contact area between the connector pin and the pad electrode) of the connector pin that is in contact with the pad electrode when the mounting of the ink cartridge is completed. In this electrical contact point, the pad electrode and the connector pin (electrical connecting portion) can be electrically connected. The pad electrode and the electrical connecting portion are electrically connected and electricity flows through the electrical contact point, so that the recording apparatus can detect the mounting of the ink cartridge, for example. Besides, for example, the recording apparatus reads the information (ink property information such as ink color information and/or ink remainder information) the ink cartridge provided in a chip or the like, and the recording apparatus can recognize the type of the mounted ink cartridge. 
     &lt;Ink Cartridge&gt; 
     An ink cartridge mountable to the recording apparatus shown in  FIG.  1    will be described. 
     Parts (a)-(d) of  FIG.  6    shows the appearance of the ink cartridge. Part (a) of  FIG.  6    is a view illustrating the appearance of the ink cartridge  20 . Parts (b) to (d) of  FIG.  6    are illustrations showing the ink cartridge  20  shown in part (a) of  FIG.  6    as seen at another angle. 
     One ink cartridge  20  shown in Parts (a)-(d) of  FIG.  6    stores one-color of ink. A plurality of color inks may be stored separately in one ink cartridge  20  or may be constituted to supply the accommodated plural color inks to the respective ink receiving tubes. In addition, as a set of ink cartridges  20 , a plurality of ink cartridges may store ink of the same color. 
     The ink cartridge  20  shown in Parts (a)-(d) of  FIG.  6    is constituted with a cylindrical (cylindrical) casing as a base. As will be described hereinafter, the shape of the casing is not limited to a cylindrical shape, and it may be a polygonal prism shape such as a triangular prism shape or a quadrangular prism shape, for example. Or, it may be a conical shape, or it may be a polygonal pyramid shape such as a triangular pyramid shape or a quadrangular pyramid shape. 
     The ink cartridge  20  has at least a first portion  20   a , a second portion  20   b , and a third portion  20   c  as portions which phase outwardly of the ink cartridge  20 . The side where the insertion portion (ink discharging portion)  24  which will be described hereinafter is provided is the first portion  20   a . The part on the side opposite to the first portion  20   a  is the second portion  20   b . And, the first portion  20   a  and the second portion  20   b  are connected by the third portion  20   c . The first portion  20   a  and the second portion  20   b  are the end portions of the ink cartridge  20 , and the first portion  20   a  may be referred to as a first end portion, and the second portion  20   b  may be referred to as a second end portion. The third portion  20   c  is between the first portion  20   a  and the second portion  20   b , and in Parts (a)-(d) of  FIG.  6   , the third portion  20   c  extends in a direction perpendicular to the first portion  20   a  and the second portion  20   b . As shown in Parts (a)-(d) of  FIG.  6   , the first portion  20   a , the second portion  20   b , and the third portion  20   c  may be respective surfaces. Or, at least one of the first portion  20   a , the second portion  20   b , and the third portion  20   c  may not be a surface. For example, when the ink cartridge  20  has a triangular pyramidal shape, the first portion  20   a  is the bottom surface of the triangular pyramid and the second portion  20   b  is the apex on the bottom surface of the triangular pyramid (at a position opposed to the bottom surface), the third portion  20   c  may be a side surface of a triangular pyramid. In such a case, the second portion  20   b  is an apex, not a surface. 
     The portion facing outwardly of the ink cartridge  20  refers to a portion facing away from a central axis of the ink cartridge  20  (an axis extending through the center of gravity of the ink cartridge  20  or extending parallel to the longitudinal direction of the ink cartridge  20 ). For example, the side surface of the columnar ink cartridge  20  shown in Parts (a)-(d) of  FIG.  6    faces away from the central axis of the ink cartridge  20 , so that it faces outwardly of the ink cartridge  20 . On the other hand, for example, the upper surface (upper surface above a gap (space)  32 ) constituting a gap (space)  32  shown in Parts (a) and (b) of  FIG.  20    is a portion exposed to the outside (space) (outwardly) of the ink cartridge  20 . However, since it faces in the direction approaching the center axis of the ink cartridge  20 , it is not a portion facing the outside of the ink cartridge  20  but is a portion that faces to the inside of the ink cartridge  20 . 
     The first portion  20   a  has an insertion portion  24  into which the ink receiving tube  21  shown in  FIG.  3    or the like is inserted. Therefore, it can be said first portion  20   a  is a front portion of the ink cartridge  20 . In Parts (a)-(d) of  FIG.  6   , the first portion  20   a  is a surface. The insertion portion  24  may be provided with a seal member having an opening. When the seal member is provided, the ink receiving tube is inserted into the opening of the seal member of the insertion portion  24 . It is preferred that the diameter of the insertion portion  24  (the diameter as measured in the direction perpendicular to the direction in which the ink receiving tube is inserted) is 2 mm or more and 5 mm or less. It is preferred that the diameter of the first portion  20   a  including the insertion portion  24  is 8 mm or more and 14 mm or less. 
     Inside the ink cartridge  20 , the ink is stored. The ink stored in the ink cartridge  20  is supplied to the recording apparatus through the ink receiving tube inserted in the insertion portion  24  (the opening of the sealing member in the case where the sealing member is provided) and used for recording. As described above, the inserting portion  24  is a part for discharging the ink stored in the ink cartridge  20 , it can also be referred to as an ink discharging portion. 
     The ink cartridge  20  has a large-diameter portion having a diameter relatively larger (than a small-diameter portion) and a small-diameter portion having a diameter relatively smaller than the large-diameter portion. Here, the diameter is the equivalent circle diameter of the cross-section of the ink cartridge  20  as measured in the direction perpendicular to the direction from the first portion  20   a  to the second portion  20   b . The ink cartridge  20  in Parts (a)-(d) of  FIG.  6    has a circular cylindrical shape, and the diameter of the circle is measured in the cross-section taken along the direction perpendicular to the height direction of the cylinder. The part of the small diameter portion on the side where the insertion portion  24  is located is the first portion  20   a . The second portion  20   b  is provided in the large diameter portion. The third portion  20   c  connecting the first portion  20   a  and the second portion  20   b  is a surface extending between the large diameter portion and the small diameter portion and including a step between the large diameter portion and the small diameter portion. The ink cartridge  20  may not have a large diameter portion or a small diameter portion, may have the same diameter, or may have a shape including no step in the third portion  20   c . The ink cartridge  20  shown in Parts (a)-(d) of  FIG.  6    has a cylindrical shape, the first portion  20   a  and the second portion  20   b  are the bottom surface of the cylinder, and the third portion  20   c  is the side surface of the cylinder. As described above, the ink cartridge  20  is not limited to circular cylindrical shape. The first portion  20   a  and/or the second portion  20   b  may have a step shape. 
     It is preferred to the diameter of the large diameter portion of the ink cartridge  20  is 50 mm or more and 80 mm or less. It is preferred to the diameter of the small diameter portion of the ink cartridge  20  is 20 mm or more and 30 mm or less. The diameter of the ink cartridge  20  can be made different depending on the amount and kind of ink to be stored. For example, in the ink cartridge set, for a large capacity ink cartridge, the diameter of the large diameter portion is 70 mm or more and 80 mm or less (for example 75 mm). And, for a small capacity ink cartridge, the diameter of the large diameter portion is 50 mm or more and 60 mm or less (for example, 55 mm). Description, it is preferred that the diameters of the small diameter portions do not differ between different ink cartridges different in the amounts and/or the kinds, from the standpoint of mounting facilities. Therefore, the diameter of the small diameter portion is 20 mm or more and 30 mm or less (for example, 25 mm) in both the large capacity ink cartridge and the small capacity ink cartridge. It is preferred that for ink cartridges with different amounts and the kinds of ink therein, the diameters of the small diameter portions are made the same, and the diameters of the large diameter portion is made different. 
     It is preferred that the length of the large diameter portion of the ink cartridge  20  as measured in the direction parallel to the direction from the first portion  20   a  to the second portion  20   b  is 190 mm or more and 220 mm or less. It is preferred that the length of the small diameter portion of the ink cartridge  20  in the direction parallel to the direction from the first portion  20   a  to the second portion  20   b  is 20 mm or more and 30 mm or less. From the standpoint of mounting, it is preferred that the above-described lengths of the large diameter portion and the small diameter portion of the ink cartridge  20  are substantially the same, even when the amount and/or type of ink stored therein are different from each other as in the above-described ink cartridge set. Here, the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20  (the direction from the second portion  20   b  to the first portion  20   a ) in this specification is the direction in which the shortest line connecting the first portion  20   a  and the second portion  20   b  extends. This direction is the direction along the longitudinal direction of the ink cartridge  20  in Parts (a)-(d) of  FIG.  6   . In addition, it is a direction parallel to the longitudinal direction of the ink cartridge  20 . 
     Next, the projection  25  and the ID projection  28  will be described. The projecting portion  25  and the ID projection  28  are provided in the third portion  20   c  of the ink cartridge  20 . 
     In Parts (a)-(d) of  FIG.  6   , the projecting portion  25  is provided on the portion of the small diameter portion of the third portion  20   c  and projects from the periphery of the projecting portion  25  constituting the third portion  20   c . That is, the part projecting in the third portion  20   c  is the projecting portion  25 . The periphery of the projecting portion  25  is the side surface (circumferential surface portion) of the column shape here, and the projecting portion  25  projects from the side surface of the column shape. 
     The projecting portion  25  has a roof surface  25   a  serving as a roof of the projecting portion  25  and a projecting portion side surface  25   b . Here, there are four sides of the projecting portion side surface  25   b , and these surfaces are connected with the roof surface  25   a  at the upper side. A chip-shaped electrode portion  26  including a memory element storing ink color information and/or remaining ink information is provided on the roof surface  25   a . The electrode portion  26  is provided with a plurality of pad electrodes  27  which can be brought into contact with the electrical connection portion of the recording apparatus (mounting portion) and electrically connectable with the electrical connecting portion. The pad electrode  27  and the electrode portion  26  having the chip may be disposed at positions separated from each other. In such a case, they are electrically connected by wiring. 
     The roof surface  25   a  is a portion facing outwardly of the ink cartridge  20 . And, since the roof surface  25   a  is a part of a portion connecting the first portion  20   a  and the second portion  20   b , it is a part of the third portion  20   c . Therefore, it can be said electrode portion  26  and the plurality of pad electrodes  27  provided on the roof surface  25   a  are provided in the third portion  20   c . The electrode portion  26  and the plurality of pad electrodes  27  are provided at positions closer to the first portion  20   a  than to the second portion  20   b  of the third portion  20   c.    
     It is preferred that the size of the roof surface  25   a  of the projecting portion  25  is such that the maximum length of one side is 9 mm or more and 16 mm or less. The size of the roof surface  25   a  of the projecting portion  25  is the size when the roof surface  25   a  of the projecting portion  25  is viewed from the side where the pad electrode  27  is provided (from the side opposed to the pad electrode  27 ). 
     It is preferable that the height of the projection  25  is 3 mm or more and 10 mm or less. The height of the projecting portion  25  is further preferably 8 mm or less. Here, the height of the projecting portion  25  is the height projecting from the surroundings from the surrounding surface measured in the vertical direction of the projecting portion  25 , and the height of the portion is indicated by “A” in part (a) of  FIG.  6   . As shown in part (a) of  FIG.  6   , when there is a part with different height in the projecting portion  25 , it is set as an average value at 100 randomly distributed points in the projecting portion  25 . 
     It is preferable that the projecting portion  25  is located at a distance of 5 mm or more and 10 mm or less from the first portion  20   a  in a direction parallel to the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20 , on the side of the first portion  20   a . In addition, it is further preferably located at a position of 6 mm or more and 7 mm or less away from the first portion  20   a . On the other hand, it is preferred that the part on the second portion  20   b  side of the projecting portion  25  is located at a position of 20 mm or more and 25 mm or less away from the first portion  20   a  in a direction parallel to the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20 . In addition, it is further preferable that it is located at a position of 22 mm or more and 23 mm or less from the first portion  20   a . Here, the direction from the first portion  20   a  to the second portion  20   b  is the same as the longitudinal direction of the ink cartridge  20  in Parts (a)-(d) of  FIG.  6    example. In addition, “the portion on the side of the first portion  20   a ” in the present specification means “the portion closest to the first portion  20   a ”. Similarly, “the portion on the side of the second portion  20   b ” means “the portion closest to the second portion  20   b”.    
     The electrode portion  26  may be constituted only by the pad electrode  27 . In this case, the pad electrode  27  is disposed directly on the roof surface  25   a  of the projecting portion  25 . 
     In Figure the positions of the centers of gravity of the electrodes of the plurality of pad electrodes  27  are arranged on the roof surface  25   a  of the projecting portion  25  in a direction perpendicular to the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20  (in the longitudinal direction in Parts (a)-(d) of  FIG.  6   ). In other words, the positions of the centers of gravity of the electrodes of the plurality of pad electrodes  27  are arranged in the direction parallel to the direction perpendicular to the direction from the first portion  20   a  to the second portion  20   b  (the longitudinal direction in Parts (a)-(d) of  FIG.  6   ) of the ink cartridge  20  (arranged in the shorter side direction in Parts (a)-(d) of  FIG.  6   ). Each pad electrode  27  has a rectangular shape in this example. The long side and the short side of the rectangle shape are inclined with respect to the longitudinal direction and the short direction of the ink cartridge  20 . 
     The ID projection  28  is provided on the large diameter portion of the third portion  20   c . The ID projecting portion  28  projects from the portion around the ID projecting portion  28  in the third portion  20   c . The portion around the ID projection  28  is the side surface (circumferential surface) of the columnar ink cartridge, and the ID projection  28  projects from this side surface. 
     It is preferable that the portion of the ID projection  28  on the side of the first portion  20   a  is at a position of 40 mm or more and 50 mm or less away from the first portion  20   a  in a direction parallel to the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20 . In addition, it is further preferably located at a position of 41 mm or more and 45 mm or less away from the first portion  20   a . On the other hand, it is preferred that the portion of the ID projecting portion  28  on the side of the second portion  20   b  is disposed at a position of 50 mm or more and 60 mm or less away from the first portion  20   a , as measured in the direction parallel to the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20 . In addition, it is further preferably located at a position of 55 mm or more and 58 mm or less away from the first portion  20   a.    
     In addition, it is preferred that the height of the ID projection  28  is 3 mm or more and 10 mm or less. The height of the ID projection  28  is further preferably 4 mm or more and 5 mm or less. Here, the height of the ID projection  28  is the dimension in the orthogonal direction from the projection surroundings, and it is the length of the part indicated by “B” in part (d) of  FIG.  6   . In the case where the ID projecting portion  28  has portions with different heights, the height of the ID projecting portion  28  is an average value at 100 randomly dispersed positions in the ID projecting portion  28 . 
     Examples of the material for forming the projecting portion  25  include PE (polyethylene), PP (polypropylene), and the like. As a material for forming the electrode portion  26 , there is a flexible printed board made of glass epoxy or polyimide. Examples of the material for forming the pad electrode  27  include Ni, Au and the like. Materials for forming the ID projection  28  include PE (polyethylene), PP (polypropylene), and the like. 
     Parts (a) and part (b) of  FIG.  7    show the internal structure of the ink cartridge  20 . The casing  70  constituting a part of the third portion  20   c  has a two-layer structure including an outer layer  70   a  and an inner layer  70   b . The outer layer  70   a  is a layer indicated by a solid line in part (b) of  FIG.  7   , and it is preferred that it is formed of a highly rigid material. On the other hand, the inner layer  70   b  is a layer indicated by a dotted line in part (b) of  FIG.  7   , and it is preferred that it is formed of a flexible material. That is, it is preferred that the outer layer  70   a  is more rigid than the inner layer  70   b . The outer layer  70   a  and the inner layer  70   b  are separate bodies and are in a separable state from each other. The outer layer  70   a  constitutes the outer part of the casing. The inner layer  70   b  is a bag shape having flexibility and constitutes the inner part of the casing. The ink is stored inside (inside) the inner layer  70   b , and the outside thereof is covered by the outer layer  70   a . The outer layer  70   a  and the inner layer  70   b  have openings, respectively, and the two openings are disposed at overlapping positions. The opening of the inner layer  70   b  is joined to the joint member  73 , thereby forming a closed space. The ink is stored in this closed space. It is preferred that the outer layer  70   a  and the inner layer  70   b  are formed by injection blowing. Examples of materials for forming the outer layer  70   a  include PET (polyethylene terephthalate), PBT (polybutylene terephthalate), and the like. Examples of materials for forming the inner layer  70   b  include PE (polyethylene), PP (polypropylene), and the like. 
     The casing  70  is connected with the cover member  78 . The casing  70  constitutes a part of the large diameter portion of the ink cartridge. The cover member  78  constitutes a part of the large diameter portion of the ink cartridge and a part of the small diameter portion. The insertion portion  24  is provided in the small diameter portion of the cover member  78 . Examples of the material forming the cover member  78  include PE, PP, ABS (acrylonitrile-butadiene-styrene copolymer resin), and the like. It is preferred that the length of the cover member  78  is 60 mm or more and 80 mm or less. Further preferably, it is 60 mm or more, 70 mm or less. Here, the length of the cover member  78  is the length as measured in the left-right direction in part (a) of  FIG.  7   . In addition, if the ink cartridge  20  has a shape as shown in Parts (a) and (b) of  FIG.  7   , the length of the cover member  78  is the length measured in the direction along the longitudinal direction of the ink cartridge  20 . 
     A portion facing the outside of the casing  70  (the third portion  20   c  of the ink cartridge) has a screw-like groove  80  formed in the outer layer. By providing the screw-like groove  80 , the strength of the casing  70  is enhanced. The groove  80  may be a single groove or a plurality of grooves not connected with each other. 
     From the strength viewpoint of case  70 , it is preferred that the extending direction of the groove  80  is a direction inclined with respect to the longitudinal direction of the ink cartridge. 
     The ink cartridge  20  supplies the ink to the outside (into the recording apparatus) of the ink cartridge  20 , and when the amount of the contained ink decreases, the inner layer  70   b  deforms correspondingly to the volume of the decreased ink. When the stored ink is finally used up, the inner layer  70   b  is in a collapsed state. On the other hand, when the outer layer  70   a  is made of a material having a high rigidity, the outer layer  70   a  is hardly deformed and substantially maintains its original shape. In the casing  70 , the atmosphere communication vent  71  is opened in the second portion  20   b  of the ink cartridge. Through the atmosphere communication opening  71 , the atmosphere air is introduced into the space between the outer layer  70   a  and the inner layer  70   b . By covering the portions except for the small part of the atmosphere communicating vent  71  by a label  72 , evaporation of the ink can be satisfactorily suppressed. Examples of the material forming the label  72  include PP (polypropylene) film, paper, and the like. 
     The joint member  73  has an insertion portion  24  into which the ink receiving tube is inserted at the free end portion. That is, when the joint member  73  is provided, the joint member  73  constitutes at least a part of the first portion of the ink cartridge. A seal member  24   a  having an opening is provided in the insertion portion  24 , and unless it is mounted on the recording device, the supply opening valve  74  is sealed by urging the supply opening valve  74  toward the opening side by the spring  75 . Examples of the material forming the seal member  24   a  include rubber, elastomer and the like. Examples of the material forming the spring  75  include SUS (stainless steel) and the like. The other end side of the spring  75  closes the inner space of the joint member  73  and the inside of the casing by an air check valve  76 . The air check valve  76  is placed such that the air does not flow backward during the process of evacuating the casing after the ink is filled in the process of manufacturing the ink cartridge. Examples of materials of the air check valve  76  include PE (polyethylene), PP (polypropylene), and the like. After injecting the ink into the casing (inner layer), the joint member  73  is connecting to the casing, and the air in the casing is removed through the air vent  77  of joint member  73 . Thereafter, the air vent  77  is sealed with a film, but the interior of the joint member  73  and the casing is closed by the air check valve  76  so that the air does not flow back into the casing between the air venting step and the film welding step. Here, the joint member  73  is provided with the projecting portion  25 , and the electrode portion  26  is provided on the projecting portion  25 . In addition, the joint member  73  enters the cover member  78  and is exposed to the outside through the opening  78   a  of the cover member  78 . The insertion portion  24  is also exposed to the outside through the opening  78   a  of the cover member  78 . In this case, the joint member  73  constitutes a part of the first portion  20   a  of the ink cartridge and a part of the third portion  20   c.    
     When ink is supplied from the ink cartridge, the ink receiving tube is inserted into the joint member  73  from the insertion portion  24 , and the inside of the joint member  73  is decompressed. By this pressure reduction, the air check valve  76  is opened. And, the ink in the casing moves into the joint member  73  via the ink flow path member  79  and is supplied to the recording apparatus via the ink receiving pipe. The ink flow path member  79  collects the ink accumulated in the lower part in the casing and supplies it to the ink receiving pipe side. For this reason, as shown in part (b) of  FIG.  7   , it is preferred that the end portion on the far side from the insertion portion  24  is on the lower side in the direction of gravity and the end portion on the side near to the insertion portion  24  is on the upper side in the direction of gravity. In addition, as shown in part (b) of  FIG.  7   , it is preferred that the ink flow path member  79  is constituted to incline from the lower side to the upper side from the second portion side of the ink cartridge toward the first portion side. Examples of the material forming the ink flow path member  79  include PE (polyethylene), PP (polypropylene), and the like. 
     &lt;Mounting Operation of Ink Cartridge&gt; 
     The ink cartridge can be mounted to the mounting portion of the recording apparatus. The mounting operation when mounting the ink cartridge in the mounting portion of the recording apparatus will be explained. 
     Parts (a)-(e) of  FIG.  8    is a view illustrating a process of mounting the ink cartridge to the mounting portion. In Parts (a)-(e) of  FIG.  8   , for the mounting portion  14  of the recording device, a part of the hole forming member is indicated by a dotted line, for better illustration. In addition, the groove  80  of the third portion  20   c  of the ink cartridge  20  shown in  FIGS.  6  and  7    is omitted. Here, the hole forming member  14   b  covering a part of the electrical connecting portion  22  as described in part (a) of  FIG.  4    does not exist in the mounting portion  14  shown here. 
     Before the state becomes as shown in part (a) of  FIG.  8   , the first portion  20   a  side of the ink cartridge  20  is first placed in the hole of the hole forming member. And, the relative position between the ink cartridge  20  and the mounting portion  14  is roughly matched by the ID projecting portion  28  of the ink cartridge  20  and the ID recessed portion  14   c  of the mounting portion  14 . The insertion is prevented if an ink cartridge other than the ink cartridge to be inserted into the hole of the hole forming member is about to be inserted since the ID projection  28  and the ID recess portion  14   c  do not match. For example, if an attempt is made to insert an ink cartridge that stores magenta in the hole to which the ink cartridge of cyan should be inserted, the shapes of the ID projection  28  and the ID recess portion  14   c  do not match, and therefore, it is impossible to put the ink cartridge into the hole. On the other hand, for example, when trying to insert an ink cartridge storing cyan ink in a hole into which a cyan ink cartridge is to be inserted, the shapes of the ID projection  28  and the ID recess portion  14   c  match with each other, and therefore the ink cartridge can be inserted into the hole. 
     When the shape of the ID projection  28  matches the shape of the ID recess portion  14   c , the ink cartridge  20  is inserted into the hole of the mounting portion  14  along the inserting direction with the first portion  20   a  at the leading side. Part (a) of  FIG.  8    is an illustration showing the stage of partway of this insertion. The inserting direction of the ink cartridge  20  is a direction in which the first portion  20   a  is directed forward and can also be said to be a direction in which the insertion portion  24  is at the leading side. In the following, the inserting direction with the first portion  20   a  of the ink cartridge  20  at the leading side is simply referred to as “inserting direction of the ink cartridge ( 20 )”. In part (a) of  FIG.  8   , the inserting direction of the ink cartridge  20  is indicated by an arrow. The inserting direction of the ink cartridge  20  is the same as the direction from the second portion  20   b  of the ink cartridge  20  toward the first portion  20   a  (and the longitudinal direction of the ink cartridge  20 ), in this example. 
     As shown in part (a) of  FIG.  8   , when the ID recessed portion  14   c  of the mounting portion  14  extends along the extension direction of the hole formed by the hole forming member, the ink cartridge  20  is inserted so that the ID projection  28  moves along the ID recess  14   c . In Parts (a)-(e) of  FIG.  8   , the inserting direction of the ink cartridge  20  is the same as the extending direction of the hole formed by the hole forming member. 
     Part (b) of  FIG.  8    is an illustration showing a state where insertion of the ink cartridge  20  in the inserting direction is completed. It is preferred that in inserting the ink cartridge  20  up to the state shown in part (b) of  FIG.  8   , the pad electrodes  27  of the ink cartridge  20  are not exposed to the recording device (the mounting portion  14 , particularly the hole forming member  14   a ). By inserting the ink cartridge  20  up to the state of part (b) of  FIG.  8    without touching the pad electrodes  27  with the recording device, it is possible to prevent the pad electrodes  27  from being damaged, when inserting it up to the state shown in part (b) of  FIG.  8   . Therefore, it is preferred that for example, a space is provided so that the pad electrodes  27  do not touch the hole formed by the hole forming member of the mounting portion  14 , by which the pad electrodes  27  of the electrode portion  26  do not touch the recording device while the ink cartridge  20  is being inserted in the inserting direction. Or, by increasing the diameter of the hole  14   d  shown in part (a) of  FIG.  2   , the pad electrodes  27  can be prevented from hitting the hole forming member  14   a.    
     Here, at the stage of part (b) of  FIG.  8   , the ink receiving tube  21  of the mounting portion is inserted in the insertion portion  24 . That is, the ink receiving tube  21  is inserted into the inserting portion  24  in a process of advancing the ink cartridge  20  straight along the inserting direction and inserting it into the hole forming member. 
     Next, for example, as the projection  25  comes into contact with the mounting portion, the ink cartridge  20  is rotated as shown in part (c) of  FIG.  8   . The trigger of the rotation of the ink cartridge  20  is not limited to this. For example, a mark may be provided on the ink cartridge  20 , and the user may start to rotate the ink cartridge  20  using this mark. Or, by closing the cover of the recording device, the cover pushes the ink cartridge  20 , the ink cartridge  20  may be inserted in the inserting direction until a certain point, and then the rotation may be started. 
     The rotation of the ink cartridge  20  shown in part (c) of  FIG.  8    is a rotation about an axis along the inserting direction of the ink cartridge  20 . In other words, when inserting the ink cartridge  20  in the inserting direction along the central axis of the ink cartridge  20 , it is the rotation with the central axis of the ink cartridge  20  as the rotational axis. Or, it can be said this rotation is the rotation about the axis along the extending direction of the ink receiving tube  21  as the rotation axis. In addition, in the case of the ink cartridge  20  shaped as shown in Parts (a)-(e) of  FIG.  8   , it is the rotation about the axis along the longitudinal direction of the ink cartridge  20 . At the time of the rotation shown in part (c) of  FIG.  8   , the ink cartridge  20  does not move in the above-mentioned inserting direction. By the rotation of the ink cartridge  20 , the state shown in part (c) of  FIG.  8    is changed from the state shown in part (c) of  FIG.  8   . In the state shown in part (d) of  FIG.  8   , the projecting portion  25 , the electrode portion  26  on the projecting portion  25 , and the plurality of pad electrodes  27  are placed between the two positioning walls interposing the plurality of electrical connecting portions  22  (only one positioning wall  23   b  is shown in Parts (a)-(e) of  FIG.  8   ). When the rotation advances to the state shown in part (e) of  FIG.  8   , the projecting portion  25 , the electrode portion  26 , and the plurality of pad electrodes  27  are interposed between the positioning walls, and the electric connecting portion  22  of the mounting portion is brought into contact with the center of gravity of each pad electrode of the plurality of pad electrodes  27 . Therefore, the pad electrode  27  becomes electrically connected to the electric connecting portion  22 . When the pad electrode  27  comes into contact with the electrical connecting portion  22  and becomes electrically connected, mounting of the ink cartridge  20  to the mounting portion is completed. Here, the center of gravity of the pad electrode  27  is not necessarily in contact with the electric connecting portion  22 , but it is preferable that the center of gravity of the pad electrode  27  contacts the electric connecting portion  22  from the standpoint of the reliability of electrical connection. In addition, it is preferred that a space is provided in the mounting portion to prevent the ID projecting portion  28  from coming into contact with the hole forming member during this rotation. Here, each of the plurality of pad electrodes  27  shown in Parts (a)-(e) of  FIG.  8    has a rectangular shape, and the center of each pad electrode  27  is the center of gravity of the pad electrode  27 , in this example. 
     At the completion of the mounting shown in part (e) of  FIG.  8   , the preferred position of the tip of the ink receiving tube  21  is as follows. That is, it is 10 mm or more, 20 mm or less away from the first portion  20   a  of the ink cartridge  20 , as measured in a direction parallel to the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20 . Further preferably, it is located 11 mm or more and 15 mm or less away from the first portion  20   a . Here, in Parts (a)-(e) of  FIG.  8   , the direction from the first portion  20   a  to the second portion  20   b  is the same as the longitudinal direction and the inserting direction of the ink cartridge  20 . 
     Parts (a) to (d) of  FIG.  9    show the movement of the pad electrode  27  as viewed and another angle by the rotation of the ink cartridge  20  shown in parts (b) to (e) of  FIG.  8   . Parts (a)-(d) of  FIG.  9    is an enlarged view of the periphery of the electrical connecting portion peripheral portion  23  as viewed in the direction perpendicular to the inserting direction of the ink cartridge  20 . Parts (a) to (d) in  FIG.  9    correspond to parts (b) to (e) in  FIG.  8   , respectively. As shown in parts (a) to (d) of  FIG.  9   , the projecting portion  25 , the electrode portion  26 , and the plurality of pad electrodes  27  are inserted between the two positioning walls interposing the plurality of electric connecting portions  22 , by the rotation of the ink cartridge  20 . And, the plurality of pad electrodes  27  of the electrode portion  26  come into contact with the electrical connection portion  22  of the electrical connection portion peripheral portion  23 , and are electrically connected to the electrical connection portion  22 . As shown in Parts (a)-(d) of  FIG.  9   , while the ink cartridge  20  is being rotated, the ink cartridge  20  is not moved in the inserting direction. 
     By bring the positioning wall (the positioning walls  23   a ,  23   b  in  FIG.  4   ) into contact with the projecting portion  25  (particularly the projecting portion side surface  25   b  of the projecting portion  25  in particular), the ink cartridge  20  is easy to rotate along the shape of the positioning wall, when the ink cartridge  20  rotates. The positioning wall can determine the position of the projection  25  in rotational mounting. By bring the projecting portion  25  and the positioning wall into contact with each other, the pad electrodes  27  of the ink cartridge  20  is positioned relative to the electrical connecting portion  22  of the mounting portion. 
     Here, even when the ink cartridge  20  does not have the projecting portion  25 , it is easy to position the pad electrodes  27  of the electrode portion  26  relative to the electrical connecting portion  22  of the mounting portion, by bring the electrode portion  26  into contact with the positioning wall. In this case, the ink cartridge  20  is rotated in contact with the side surface of the electrode portion  26  into contact with the positioning wall. 
     As described above, when the projecting portion  25  (projecting portion side surface  25   b ) of the ink cartridge  20  and the electrode portion  26  are rotated while being in contact with the positioning wall, the rotary mounting becomes easy. And, in this case, the moving direction of the pad electrode  27  when the ink cartridge  20  is rotated is the direction along the extending direction of the positioning wall. Furthermore, the moving direction of the pad electrode  27  when the ink cartridge  20  is rotated may be parallel to the extending direction of the positioning wall. 
     When performing the rotational mounting as described above, the pad electrode  27  moves in a direction different from the inserting direction of the ink cartridge  20  indicated by an arrow in part (a) of  FIG.  8   , part (b) of  FIG.  8    and part (a) of  FIG.  9   . The moving direction of the pad electrode  27  is the same as the rotational direction indicated by the arrow in part (c) of  FIG.  8   , part (d) of  FIG.  8   , part (b) of  FIG.  9    and part (c) of  FIG.  9   . As the pad electrode  27  moves, the pad electrode  27  can be electrically connected to the electrical connecting portion  22  of the mounting portion. 
     As described above, with rotation mounting, the pad electrode  27  moves in a direction different from the inserting direction of the ink cartridge  20  when the ink cartridge  20  is mounted. In addition, the ink cartridge  20  is rotatable about the axis along the inserting direction as the rotation axis (or the extending direction of the ink receiving tube, the direction from the first portion  20   a  to the second portion  20   b  (the direction from the second portion  20   b  to the first portion  20   a ), the longitudinal direction). An ink discharging portion (insertion portion)  24  is provided on this rotary shaft. And, the pad electrode  27  moves as described above by the rotation. Therefore, even if the ink cartridge  20  is strongly inserted in the inserting direction, the impact applied to the pad electrode  27  and the electrical connecting portion  22  when the pad electrode  27  contacts the electrical connecting portion  22  can be reduced. This is because the inserting direction of the ink cartridge  20  and the moving direction of the pad electrode  27  are different from each other. In  FIGS.  8  and  9   , the pad electrode  27  is not in contact with the electrical connecting portion  22  when inserting in the inserting direction. Since the impact applied to the pad electrode  27  and the electrical connecting portion  22  can be reduced, the contact between the pad electrode  27  and the electrical connecting portion  22  can be improved. In addition, occurrence of deformation and so on of the pad electrode  27  and the electric connecting portion  22  and so on can be suppressed. 
     On the other hand, a case is considered in which when the ink cartridge  20  is inserted in the inserting direction, the pad electrode  27  moves only in the same direction as the inserting direction of the ink cartridge  20 , and the pad electrode  27  is electrically connected to the electrical connecting portion  22 . In this case, the impact caused by the insertion of the ink cartridge  20  in the inserting direction tends to be directly transmitted to the pad electrode  27  contacting the electrical connecting portion  22 . An insertion speed of the ink cartridge  20  in the inserting direction tends to be high. Therefore, when the impact caused by the insertion in the inserting direction tends to be transmitted to the pad electrodes  27  and the electrical connecting portion  22  when the pad electrodes  27  and the electrical connecting portion  22  are connected, the contact between the pad electrodes  27  and the electrical connecting portion  22  may not be good enough in some cases. As a result, deformation or the like of the pad electrodes  27  and the electric connecting portion  22  may occur. 
     The angle through which the ink cartridge  20  rotates (the angle through which the ink cartridge  20  is rotated) after insertion in the inserting direction is preferably 180 degrees or less in consideration of operability. Further preferably, it is 135 degrees or less, and even further preferably 100 degrees or less. In addition, from the standpoint of operability, it is preferably 10 degrees or more, further preferably it is 45 degrees or more, even further preferably 80 degrees or more. The rotation angle of the ink cartridge  20  is most preferably 90 degrees. Here, the rotation angle of the ink cartridge  20  is the rotation angle through which a certain point of the ink cartridge  20  rotates about the center of gravity of the portion in the direction perpendicular to the inserting direction of the ink cartridge, when viewing the ink cartridge from the first portion side. The certain point of the ink cartridge  20  is, for example, the pad electrode  27  or the ID projection  28 . To explain in the Figure, the rotation angle of the ink cartridge  20  is an angle, from the position of part (b) of  FIG.  8    to the position of part (e) of  FIG.  8   , or from the position of part (a) of  FIG.  9    to the position of part (d) of  FIG.  9   . In these Figures, the ink cartridge  20  is rotated by 90 degrees. 
     &lt;Removing Operation of Ink Cartridge&gt; 
     The ink cartridge  20  is dismounted from the mounting portion when consuming the stored ink up and replacing the ink cartridge, for example. Removal operation when removing the ink cartridge  20  from the mounting portion will be described. 
     Removal of the ink cartridge  20  may basically be carried out so as to make the movement opposite to the mounting. First, the ink cartridge  20  is rotated in a direction opposite to the rotating direction at the time of mounting. By the rotation, the pad electrode  27  is separated from the electrical connecting portion  22 . Next, in the case where the positioning walls  23   a ,  23   b  and the projecting portion  25  are provided, the projecting portion  25 , the electrode portion  26 , and the pad electrodes  27  come out from between the positioning walls  23   a ,  23   b . The direction of this movement is opposite to the direction of movement of the pad electrode  27  described above. 
     When the projecting portion  25  is provided, the rotation of the ink cartridge  20  is carried out until the projecting portion  25  is not interposed by the positioning walls  23   a ,  23   b . When the projecting portion  25  is not interposed between the positioning walls  23   a ,  23   b , the ink cartridge  20  can be pulled out, and therefore, the ink cartridge  20  is pulled straight out in the direction opposite to the inserting direction described above. 
     In this manner, the removal of the ink cartridge  20  from the mounting portion is completed. 
     In the structure in which the ink cartridge  20  is rotated and then pulled out, the speed at which the ink cartridge  20  is removed (the moving speed of a certain point of the ink cartridge  20 ) tends to be slow due to the rotation. Accordingly, the contact state between the pad electrodes  27  and the electrical connecting portions is made preferable, And sudden removal of the ink receiving tube  21  from the insertion portion  24  can be suppressed, the ink receiving tube  21  and the ink in the insertion portion  24  Scattering hardly occurs. 
     On the other hand, if removal of the ink cartridge  20  is carried out by pulling straight out in the direction opposite to the inserting direction, the speed of removal of the ink cartridge  20  tends to be high. Therefore, the scattering of ink may occur in the ink receiving tube  21  or the inserting portion  24  as described above. 
     Regarding the removal of the ink cartridge  20 , the above-described structures are merely an example, and the present invention is not limited to this. It is not always necessary to remove it by the operation in the opposite movement. 
     Embodiment 2 
     The Embodiment 2 will be described focusing on parts different from those of Embodiment 1. In the following description of each embodiment, explanation will be focused on the characteristic parts of each embodiment, and description of common parts may be omitted in some cases. 
     In Embodiment 1, the electrical connecting portion  22  of the mounting portion is in contact with the center of gravity of each pad electrode  27  in the plurality of pad electrodes  27  of the ink cartridge  20 , and the pad electrode  27  is electrically connected to the electrical connecting portion  22 . Since the electrical connection point  22  and the pad electrode  27  are in electrical contact with each other because they are in contact with each other, the electrical contact point is the same as the center of gravity of each pad electrode  27 . 
     In addition, in Embodiment 1, the ink cartridge  20  is rotated as shown in Parts (a)-(d) of  FIG.  9   . The moving direction of the pad electrode  27  in this rotation is the same direction or parallel to the direction connecting the centers of gravity of the plurality of pad electrodes  27 . Since the center of gravity of each pad electrode  27  is electrical contact point, the direction in which the electrical contact points of the pad electrodes are arranged in Embodiment 1 is the same as or parallel to the moving direction of the pad electrode  27 . Here, the direction in which the electrical contact points of the pad electrodes in the plurality of pad electrodes in this specification are arranged means the direction in which the line connecting the electrical contact points of the pad electrodes extends. It is unnecessary to consider all the pad electrodes of the plural pad electrodes and it suffices to consider the direction in which the electrical contact points of the pad electrodes of at least two pad electrodes are arranged. In addition, the movement trace of the pad electrode is a curve in Embodiment 1 for example, however, in this specification, the tangential line of the curve at the crossing of the curve and the pad electrode is taken as the moving direction of the pad electrode in such a case. In the case that it is difficult to determine the position of the electrical contact point, the direction of the arrangement of the electrical contact points may be substituted by a direction of the line connecting a downstream (with respect to the rotational direction) end of the pad electrode that is closest to the first portion  20   a  an upstream end of the pad electrode that is closest to the second portion  20   b.    
       FIG.  10    shows the structure of the ink cartridge  20  according to Embodiment 2. In Embodiment 2, the direction in which the electrical contact points of the pad electrodes  27  are arranged is a direction crossing the moving direction of the pad electrodes  27 . That is, the electrical contact points of the pad electrodes  27  are arranged in a nonparallel direction to the moving direction of the pad electrode  27 . Here, the crossing direction includes also the directions perpendicular to each other. 
     The ink cartridge  20  shown in  FIG.  10    will be described further. In  FIG.  10   , in the plurality of pad electrodes  27  of the electrode portion  26 , the positions of the centers of gravity of the pad electrodes  27  are arranged in a direction of crossing (inclining) with respect to the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20 . In  FIG.  10   , the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20  is the same as the longitudinal direction and the inserting direction of the ink cartridge  20 . In addition, a plurality of electrical connecting portions on the recording device side (not shown in  FIG.  10   ) are also made to correspond to the plurality of pad electrodes  27  and arranged in the same direction. 
     The ink cartridge  20  shown in  FIG.  10    is rotated in the same direction as described n conjunction with Parts (a)-(e) of  FIG.  8   . That is, After inserting the ink cartridge  20  in the inserting direction, the ink cartridge  20  is rotated about the ink receiving tube while preventing the ink cartridge  20  from advancing in the inserting direction. The pad electrode  27  moves due to the rotation of the ink cartridge  20 , and the electrical connecting portions comes into contact with the respective centers of gravity of the pad electrodes  27 . And, by the contact between the pad electrodes  27  and the electric connecting portions, the pad electrodes  27  and the electric connecting portions are electrically connected. As described above, the center of gravity of the plurality of pad electrodes  27  are arranged in the direction crossing the moving direction of the pad electrodes  27 . In all the pad electrodes  27 , the center of gravity of each pad electrode  27  are the electrical contact point. Therefore, in the plurality of pad electrodes  27 , the direction in which the electrical contact points of the pad electrodes  27  are arranged crosses or crosses the moving direction of the pad electrodes  27 . 
     In the ink cartridge  20  shown in  FIG.  10   , as the projecting portion  25  is viewed from the side opposed to the pad electrodes  27  (the upper side of the pad electrode  27 ), the portion of the projecting portion side surface  25   b  of the projecting portion  25  interposing the pad electrode  27  is partially projected in shape. As described above, a projection is provided on the projecting portion side surface  25   b , and the projection is brought into contact with the positioning wall to rotate the ink cartridge  20 , thereby stabilizing the mounting. 
     By the electrode pads  27  in arranged such that they are arranged in a direction crossing the direction of movement of the pad electrodes  27 , it is easy to increase the distance from the electrical contact point of the pad electrode  27 . For this reason, electrical connection at electrical contact point is improved. On the contrary, if the electrical contact points of the pad electrodes  27  are arranged side by side in the direction parallel to the entry direction of the connector pins, that is, in the direction parallel to the moving direction of the pad electrode  27 , the distance from the electrical contact point of the pad electrode  27  is not easily increase. This is because the arranging direction of the pad electrodes  27  is the same as the moving direction, it is difficult to increase the distance of the pad electrodes. 
     It is preferred that the electrical contact point of each pad electrode is arranged at a position of 5 mm or more and 25 mm or less however the first portion  20   a  in a direction parallel to the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20 . Further preferably, it is 10 mm or more and 20 mm or less away from the first portion  20   a . It is preferred that the electrical contact points of all the pad electrodes are in this range. That is, the electrode portion  26  and the pad electrodes  27  preferably provided adjacent to the first portion  20   a.    
     The positional relationship between the projection of the projecting portion side surface  25   b  of the projecting portion  25  and the electrical contact point of the pad electrode will be described.  FIG.  38    is an enlarged view of the projecting portion  25  of the ink cartridge  20 , the electrode portion  26  on the projecting portion  25 , and the pad electrode  27 , shown in  FIG.  10   . The projections  25   c ,  25   d  project from the side surface  25   b  of the projecting portion which is the side surface of the projecting portion  25 . In the projections  25   c ,  25   d , the projection  25   c  is on the side close to the first portion  20   a  and the projection  25   d  is on the side close to the second portion  20   b . The apex of the projection  25   c  (the position most projecting from the side surface  25   b  of the projecting portion) is referred to as the apex  25   c ′, and the apex of the projection  25   d  (the position projecting most from the projecting portion side surface  25   b ) is called an apex  25   d ′. And, the shortest distance from the apex  25   c ′ to the pad electrode  27   c  is the length An on the straight line connecting the apex  25   c ′ and the apex  25   d ′, and the shortest distance from the apex  25   d ′ to the pad electrode  27   b  is the length B ( FIG.  38   ). The length A is preferably 2.0 mm or more and 4.0 mm or less, and further preferably 2.5 mm or more and 3.5 mm or less. Similarly, the length B is preferably 2.0 mm or more and 4.0 mm or less, and further preferably 2.5 mm or more and 3.5 mm or less. 
     In Embodiment 2, the direction in which the electrical contact points of the respective pad electrodes in the plurality of pad electrodes are arranged crosses the direction from the first portion  20   a  to the second portion  20   b . The preferred arrangement of the electrical contact points of the pad electrodes is as follows. That is, it is preferred that the electrical contact point of the pad electrode closest to the first portion  20   a  is disposed at a position of 5 mm or more and 15 mm or less from the first portion  20   a  as measured in a direction parallel to the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20 . Further preferably, it is 10 mm or more and 11 mm or less from the first portion  20   a . On the other hand, it is preferred that the electrical contact point of the pad electrode most remote from the first portion  20   a  is disposed at a position of 15 mm or more and 25 mm or less away from the first portion  20   a  as measured in the direction parallel to the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20 . Further preferably, it is 17 mm or more and 18 mm or less away from the first portion  20   a . Here, in this specification, when the electrical contact points of the respective pad electrodes are not arranged on a straight line, the direction in which the electrical contact points of the respective pad electrodes are arranged is the direction of the linear approximation line of the electrical contact points. 
     Embodiment 3 
     In Embodiment 3, the mounting operation of the ink cartridge to the mounting portion of the recording apparatus is different from that described in Embodiment 1. 
     The mounting operation in Embodiment 3 will be described, referring to Parts (a)-(d) of  FIG.  11   . The ink cartridge  20  mounted in Parts (a)-(d) of  FIG.  11    is the ink cartridge described in Embodiment 2. Here, in Parts (a)-(d) of  FIG.  11   , the hole forming member of the mounting portion is omitted, and only the electrical connecting portion peripheral portion  23  of the mounting portion is shown. 
     The explanation up to the state of part (a) in  FIG.  11    is the same as the explanation from part (a) of  FIG.  8    to part (b) of  FIG.  8   . However, in Embodiment 3, in the state of part (a) of  FIG.  11   , that is, before the rotation of the ink cartridge  20 , it is not necessary to insert the ink receiving tube (not shown in Parts (a)-(d) of  FIG.  11   ) into the insertion portion  24 . It is preferred that in Embodiment 3, in a state before the ink cartridge  20  is rotated, the ink receiving tube is not inserted into the insertion portion  24 . 
     The reason why it is preferable not to insert the ink receiving tube in the insertion portion  24  in a state before the rotation of the ink cartridge  20  is as follows. It is preferred that when inserting the ink receiving tube into the insertion portion  24  or pulling out the ink receiving tube from the insertion portion  24 , the movement of the ink cartridge  20  is made as slow as possible in order to suppress scattering of ink from the ink receiving tube or the insertion portion  24 . Therefore, it is preferred that up to the state of part (a) in  FIG.  11   , the ink receiving tube is not inserted into the inserting portion  24 , and the ink receiving tube is inserted into the inserting portion  24  at the timing when the movement of the ink cartridge becomes slow by the subsequent rotation. 
     The same applies when removing the ink receiving tube from the insertion portion  24 . During the rotation of the ink cartridge  20  in which the movement of the ink cartridge  20  tends to become slow, the ink receiving tube comes out of the insertion portion  24  and the state of part (a) of  FIG.  11    is provided. Thereafter, the ink cartridge  20  is pulled out from the mounting portion in the direction opposite to the inserting direction. When extracting the ink cartridge  20  in the direction opposite to the inserting direction, there is no situation where the ink receiving tube comes out of the insertion portion  24 . For this reason, even if the ink cartridge  20  is pulled out in the direction opposite to the inserting direction earlier, the scattering of ink does not easily occur. 
     This is the reason why it is preferable not to insert the ink receiving tube into the insertion portion  24  before rotating the ink cartridge  20  in Embodiment 3. 
     Next, as shown in part (b) of  FIG.  11   , the ink cartridge  20  is rotated. Timing of rotation can be the same as that explained in Embodiment 1. However, in Embodiment 3, also in this rotation, the ink cartridge  20  is inserted in the inserting direction. That is, the ink cartridge  20  is inserted in the inserting direction with the first portion  20   a  (and the insertion portion  24 ) at the leading side while the ink cartridge  20  itself rotates. The trace of the movement of a certain point of the ink cartridge  20  ((the pad electrode  27  and the ID projection  28 , for example) in this movement process is a screw shape (helical shape). In the following, such rotation is referred to as “screw rotation”, and mounting by screw rotation of the ink cartridge is referred to as “screw rotation mounting”. 
     When the ink receiving tube is not inserted into the insertion portion  24  in the state of part (a) of  FIG.  11   , the ink receiving tube is inserted into the insertion portion  24  in the process of screw rotation mounting of the ink cartridge  20 . When the ink receiving tube is inserted into the insertion portion  24  by the rotation of the ink cartridge  20 , it is preferable that the ink receiving tube starts to be inserted into the insertion portion  24  by rotating the ink cartridge more than 10 degrees from the state of part (a) in  FIG.  11   . The angle through which the ink cartridge  20  rotates until the ink receiving tube is inserted into the insertion portion  24  is further preferably 15 degrees or more, and even further preferably 20 degrees or more. In addition, the angle through which the ink cartridge  20  rotates until the ink receiving tube is inserted into the insertion portion  24  is preferably 40 degrees or less, further preferably 30 degrees or less, and even further preferably 25 degrees or less. 
     By the screw rotation mounting, the state shown in part (b) of  FIG.  11    is changed to the state shown in part (c) of  FIG.  11   . In the state shown in part (c) of  FIG.  11   , the projecting portion  25 , the electrode portion  26  on the projecting portion  25 , and the plurality of pad electrodes  27  start to be inserted between the two positioning walls interposing the plurality of electrical connecting portions. It is preferred that the angle through which the ink cartridge  20  rotates until the plurality of pad electrodes  27  start to be inserted between the two positioning walls interposing the plurality of electric connecting portions is 40 degrees or more. Further preferably, it is 50 degrees or more, even further preferably 55 degrees or more. In addition, it is preferred that the angle through which the ink cartridge  20  rotates until the plurality of pad electrodes  27  start to be inserted between the two positioning walls interposing the plurality of electric connecting portions is 75 degrees or less. Further preferably, it is 70 degrees or less, and even further preferably 65 degrees or less. 
     When advancing the screw rotation until the state shown in part (d) of  FIG.  11    is reached, the projecting portion  25 , the electrode portion  26 , and the plurality of pad electrodes  27  are interposed between the positioning walls, and the electrical connecting portion of the mounting portion come into contact with the centers of gravity of pad electrodes  27 . Therefore, the pad electrode  27  is electrically connected to the electrical connection portion. When the pad electrodes  27  come into contact with the electrical connecting portions and are electrically connected with each other, the mounting of the ink cartridge  20  to the mounting portion is completed. The angle through which the ink cartridge  20  rotates until the plurality of pad electrodes  27  start contacting the electrical connecting portion is preferably 70 degrees or more, and further preferably 80 degrees or more. In addition, the angle through which the ink cartridge  20  rotates before the plurality of pad electrodes  27  start contacting the electrical connecting portion is preferably 90 degrees or less, further preferably 88 degrees or less. 
     Part (d) of  FIG.  11    shows the completion state of the mounting in which the pad electrode  27  has been brought into electrical contact with the electrical connecting portion, and therefore, they are electrically connected. It is preferred that the angle through which the ink cartridge  20  rotates by the time of completion of mounting is 90 degrees. 
     The preferred position of the tip of the ink receiving tube at the completion of mounting is as follows. That is, it is preferred that it is 10 mm or more and 20 mm or less away from the first portion  20   a  of the ink cartridge  20  as measured in a direction parallel to the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20 . Further preferably, it is away from 11 mm or more to 15 mm or less from the first portion  20   a . Here, the direction from the first portion  20   a  to the second portion  20   b  is the same as the longitudinal direction and the inserting direction of the ink cartridge  20  in Parts (a)-(d) of  FIG.  11   . 
     Parts (a) to (d) of  FIG.  12    show the movement of the pad electrode  27  shown in parts (a) to (d) of  FIG.  11    as viewed from another angle. Parts (a)-(d) of  FIG.  12    is an enlarged view of the periphery of the electrical connecting portion peripheral portion  23 . Parts (a) to (d) in  FIG.  12    correspond to parts (a) to (d) in Parts (a)-(d) of  FIG.  11   , respectively. As shown in parts (a) to (d) of  FIG.  12   , the projecting portion  25 , the electrode portion  26 , and the plurality of pad electrodes  27  are inserted between the two positioning walls by the screw rotation of the ink cartridge  20 , and the positioning walls are opposed to each other interposing a plurality of electric connecting portions  22 . And, the plurality of pad electrodes  27  of the electrode portion  26  contact the electrical connection portions  22  of the electrical connection portion peripheral portion  23  and are electrically connected to the electrical connection portion  22 . 
     Here, it is preferred that even when the screw of the ink cartridge  20  is rotated, the positioning walls  23   a  and  23   b  are in contact with the projecting portion  25  (in particular, the projecting portion side surface  25   b  of the projecting portion  25 ). The contact between the positioning walls  23   a ,  23   b  and the projection  25  facilitates screw rotation of the ink cartridge  20  along the shape of the positioning walls  23   a ,  23   b . The positioning walls  23   a ,  23   b  can determine the position of the projecting portion  25  in screw rotation mounting. The pad electrode  27  of the ink cartridge  20  is positioned with respect to the electrical connecting portion  22  of the mounting portion by the mutual contact operation between the projecting portion  25  and the positioning walls  23   a ,  23   b.    
     It is preferred that an angle formed between the projecting portion side surface  25   b  of the projecting portion  25  and a direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20  is 50 degrees or more and 70 degrees or less. Further preferably, it is 55 degrees or more. In addition, it is preferably less than 60 degrees. Here, this angle is the angle as viewed from the side facing the top surface of the projecting portion  25 . The direction of the projecting portion side surface  25   b  is the direction in which the projecting portion side surface  25   b  extends as the projecting portion  25  is viewed from the side opposed to the pad electrode  27 . Here, in the case where the projecting portion side surface  25   b  does not have a linear shape due to including the projection as described above, the direction of the side surface may be determined by regarding the projecting portion side surface  25   b  as the approximate straight line. If such a relationship of angles is satisfied, better mounting is possible. Here, although a plurality of projecting portion side surfaces  25   b  are provided, better mounting is possible if at least one of the projecting portion side surfaces  25   b  satisfies the above angle relationship. In particular, it is preferred that in the direction in which the pad electrodes  27  are arranged, the projecting portion side surfaces  25   b  positioned on the outer sides of the opposite ends of the plurality of pad electrodes  27  satisfy the above-described angle relationship. 
     Here, in this specification, unless otherwise noted, the angle formed between two directions and the angle at which a certain direction is inclined with respect to another direction are the smaller of the four angles formed by the two directions. In other words it is the pair of the smaller angles out of two pairs of the same angles. In addition, when two directions (or lines) are in a twisted position relationship, two lines parallel to each direction (or line) are drawn from arbitrary points, and the angle formed by the two directions (or lines) is the intended angle. 
     Even when the ink cartridge  20  does not have the projecting portion  25 , the positioning between the pad electrode  27  of the electrode portion  26  and the electrical connecting portion  22  of the mounting portion is easy by bring the electrode portion  26  into contact with the positioning walls  23   a ,  23   b . In this case, the moving direction of the pad electrode  27  in the screw rotation of the ink cartridge  20  is the direction along the extending direction of the positioning walls  23   a ,  23   b . In addition, the moving direction of the pad electrode  27  at the time of screw rotation of the ink cartridge  20  can be the direction along the extending direction of the positioning walls  23   a ,  23   b . Further, the moving direction of the pad electrode  27  at the time of screw rotation of the ink cartridge  20  can be made parallel to the extending direction of the positioning walls  23   a ,  23   b.    
     When the screw rotation mounting as described above is carried out, the pad electrode  27  moves in a moving direction different from the inserting direction of the ink cartridge  20  indicated by an arrow in part (a) of  FIG.  11   . In screw rotation mounting, the pad electrode  27  rotates in a screw shape with a component in the inserting direction, And the pad electrode  27  moves while rotating in a screw shape with respect to the linear inserting direction. That is, the pad electrode  27  moves in a direction different from the inserting direction of the ink cartridge  20 . As the pad electrode  27  moves, the pad electrode  27  comes in contact with the electric connecting portion and is electrically connected to the electric connecting portion. 
     As described above, in screw rotation mounting, when mounting the ink cartridge  20 , the pad electrode  27  moves in a direction different from the inserting direction of the ink cartridge  20 . Therefore, even if the insertion of the ink cartridge  20  in the inserting direction is carried out with a strong force, the impact applied to the pad electrode  27  and the electrical connecting portion  22  when the pad electrode  27  comes into contact with the electrical connecting portion  22  on the mounting portion side can be made smaller. Since the impact applied to the pad electrode  27  and the electric connecting portion  22  can be reduced, the pad electrode  27  and the electric connecting portion  22  can be brought into good contact with each other. 
     As has been descried in the foregoing, the ink cartridge  20  is rotatable about the axis extending along the inserting direction and the longitudinal direction, and can be mounted by this rotation. And, when mounting the ink cartridge  20 , the pad electrode  27  moves in a direction different from the inserting direction of the ink cartridge  20 . It is preferred that the moving direction of the pad electrode  27  is inclined by 50 degrees or more with respect to the inserting direction of the ink cartridge  20 . In addition, it is further preferable that it is inclined by 60 degrees or more. As in Embodiment 1, it may be inclined (orthogonal) by 90 degrees, but it is preferable that the inclination is 80 degrees or less, further preferably 70 degrees or less. 
     Additionally, in Embodiment 2, the ink cartridge  20  is inserted in the inserting direction, and after the insertion in the inserting direction is stopped, the ink cartridge  20  is rotated so that pad electrode  27  is moved in a direction different from the inserting direction of the ink cartridge  20 . On the other hand, in Embodiment 3, also in the rotation after inserting the ink cartridge  20  in the inserting direction, the ink cartridge  20  is rotated (screw rotation) while being inserted in the inserting direction so that pad electrode  27  is moved in a direction different from the inserting direction of ink cartridge  20 . 
     In Embodiment 3, the ink cartridge  20  is mounted with the screw rotation, and therefore, the moving speed of the ink cartridge  20  in the inserting direction tends to be slow. Therefore, the movement speed of the pad electrode  27  of the ink cartridge  20  is also likely to be slow, and the contacting action relative to the electrical connecting portion of the pad electrode  27  can be satisfactorily performed. In addition, a series of actions up to completion of mounting can be carried out more smoothly, and therefore, it is also excellent in terms of operability. As described above, it is possible to make the inserting direction of the ink cartridge  20  and the moving direction of the pad electrode  27  different from each other merely by executing screw rotation mounting. Further, deformation of the pad electrode  27  and scattering of ink at the ink receiving tube and the insertion portion are less likely to occur in removing the ink cartridge  20 . 
     Here, the angle through which the screw of the ink cartridge  20  is rotated is preferably 180 degrees or less, further preferably 135 degrees or less, and even further preferably 100 degrees or less from the standpoint of operability. In addition, from the standpoint of operability, it is preferably 10 degrees or more, further preferably 45 degrees or more, even further preferably 80 degrees or more. The angle through which the screw of the ink cartridge  20  is rotated is most preferably 90 degrees. Here, the angle through which the ink cartridge  20  makes the screw rotation is the rotation angle when a certain point of the ink cartridge  20  rotates about the center of gravity of the cross-section in the direction perpendicular to the inserting direction of the ink cartridge  20  as viewing the ink cartridge  20  from the first portion side. The certain point of the ink cartridge  20  is, for example, the pad electrode  27  or the ID projection  28 . To explain in the Figure, the angle through which the ink cartridge  20  rotates is an angle from the position of part (a) of  FIG.  11    to the position of part (d) of  FIG.  11    or from the position of part (a) of  FIG.  12    to the position of part (d) of  FIG.  12   . In these Figures, the ink cartridge  20  is rotated through 90 degrees. 
     In Embodiment 3, if the electrical contact points of the pad electrodes  27  are arranged in a direction crossing the moving direction of the pad electrode  27 , the arrangement and the size of the pad electrode  27  and the electric connecting portion can be selected particularly efficiently. In addition, the electrical connection between the pad electrodes  27  and the electrical connecting portions can be easily performed satisfactorily. 
     The electrical contact points of the pad electrodes  27  are preferably arranged at an angle of 60 degrees or more with respect to the moving direction of the pad electrode  27 , further preferably inclined by 70 degrees or more, even further preferably inclined by 80 degrees or more. Also, it is preferred that the electrical contact points of the pad electrodes  27  are arranged in a direction perpendicular to the moving direction of the pad electrode  27 . As described above, the angle at which two directions cross is a small angle out of the four angles formed by the two directions. Therefore, the angle at which two directions cross is at most 90 degrees. At this time, the two directions are orthogonal with each other. In addition, in Embodiment 3, the pad electrode  27  moves in the form of a screw, but in such a case, the angle formed by the two directions (inclination angle) is calculated, considering the moving direction of the pad electrode as follows. That is, the direction of movement of the pad electrode is approximated as the direction of the tangent line of the movement locus at the crossing point between the direction in which the electrical contact point of the pad electrode  27  arranged and the movement locus of the screw-shaped pad electrode  27  (approximate straight line). 
     It is preferred that the direction in which the electrical contact points of the pad electrodes  27  are arranged is inclined by 20 degrees or more and 40 degrees or less with respect to the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20 . Moreover, it is preferable that it is inclined by 30 degrees or more and 35 degrees or less. Here, the direction from the first portion  20   a  to the second portion  20   b  is the same as the longitudinal direction and the inserting direction of the ink cartridge  20  in  FIG.  10   . 
     Next, an example of the arrangement of the pad electrode  27  will be described. Parts (a) to (f) of  FIG.  13    show examples of arrangement of pad electrodes  27  as the plurality of pad electrodes  27  are viewed from above. In Parts (a)-(h) of  FIG.  13   , the moving direction of the pad electrode  27  in Embodiment 3 is indicated by a solid arrow and a line connecting the electrical contact points  27   a  of the pad electrodes  27  is indicated by a dotted line with arrows. The moving direction of the pad electrode  27  is approximately linearly shown as described above. The two arrows in parts (a)-(f) of  FIG.  13    are perpendicular to each other. That is, in parts (a)-(f) of  FIG.  13   , the electrical contact points  27   a  of the pad electrodes  27  are arranged in the direction perpendicular to the moving direction of the pad electrode  27 . Here, the plurality of pad electrodes  27  may include the pad electrode  27  in which the electrical contact point  27   a  is not the same as the center of gravity of the pad electrode  27 . For example, in the pad electrode  27  of part (c) of  FIG.  13   , the centers of gravity and the electrical contact points  27   a  do not coincide at any pad electrode  27 . 
     It is preferred that when the connector pin relatively moves toward the electrical contact point  27   a  of the pad electrode  27 , the connector pin does not touch the pad electrode other than the pad electrode supposed to be brought into contact for electrical connection. This is for the following reasons. For example, in some cases, the pad electrodes and the connector pins are already in a state of flowing electricity at the time of mounting, and the mounting completion is detected by the contact between the pad electrodes and the connector pins. In case of such detection, there is a possibility that the detection cannot be performed in order, if the connector pin contacts the pad electrode other than the pad electrode supposed to be contacted to establish the electrical connection. In addition, when the connector pin rides on a pad electrode other than the pad electrode to be contacted, the ridden pad electrode may be damaged. From such a standpoint, it is preferred that the arrangement is such that the pad electrodes do not overlap in the direction of insertion of the connector pin, that is, the direction of movement of the pad electrode. In the arrangements shown in parts (a), part (b) thereof, part (c) thereof, part (d) thereof, and part (f) thereof of  FIG.  13   , the pad electrodes  27  do not overlap in the moving direction of the pad electrodes  27 . 
     The relationship between the moving direction of the pad electrode  27  and the direction in which the electrical contact points of the pad electrodes  27  are arranged has been described above. Here, since the area occupied by the pad electrode  27  (the area of the pad electrode  27 ) can be an electrical contact point relative to the electrical connecting portion  22  of the pad electrode  27 , the electrical contact point of the pad electrode  27  may be considered as being the area of the pad electrode  27 . In addition, the direction in which the electrical contact point are arranged may be considered in relation with the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge or the inserting direction of the ink cartridge into the hole forming member, not in relation with the moving direction of the pad electrode  27 . Even with these structures, it is possible to make good electrical contact between the pad electrode  27  and the electrical connecting portion  22 . 
     For example, the plurality of pad electrodes  27  preferably have the areas arranged in the direction crossing the moving direction of the pad electrodes  27 , that is, the areas of (occupied by) the pad electrodes  27  are arranged so as to be crossed by a line (U, part (h) of  FIG.  13   ) inclined relative to the moving direction of the pad electrodes  27 , as viewed in the direction perpendicular to the surfaces of the pad electrodes  27  (perpendicular to the sheet of the drawing of part (h) of  FIG.  13   ). The plurality of pad electrodes  27  preferably have the areas arranged in the direction crossing the moving direction of the pad electrodes at an angle of 60 degrees or more, further preferably 70 degrees or more, and even further preferably 80 degrees or more, that is, the areas of the pad electrodes  27  are arranged so as to be crossed by a line inclined by an angle of 60 degrees or more, further preferably 70 degrees or more, and even further preferably 80 degrees or more with respect to the moving direction of the pad electrodes  27 , as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 . The plurality of pad electrodes  27  preferably have the areas arranged so as to be crossed by a line perpendicular to the moving direction of the pad electrodes  27 , as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 . Here, when the moving direction of the pad electrode is curved or screw shape, the moving direction of the pad electrode is considered as extending direction of the approximate straight line as described above. 
     In addition, it is preferred that the plurality of pad electrodes  27  have the areas arranged in the direction crossing the direction W (part (h) of  FIG.  13   ) from the first portion  20   a  toward the second portion  20   b  of the ink cartridge  20 , that is, the areas of the pad electrodes  27  are arranged so as to be crossed by a line U (part (h) of  FIG.  13   ) inclined with respect to the direction W from the first portion  20   a  toward the second portion  20   b  of the ink cartridge  20 , as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 . In addition, it is preferred that the plurality of pad electrodes  27  have the areas arranged in the direction crossing the direction W (part (h) of  FIG.  13   ) from the first portion  20   a  toward the second portion  20   b  of the ink cartridge  20  at an angle (γ) which is 10 degrees or more (β) and 60 degrees or less (α), further preferably 30 or more degrees and 35 degrees or less, that is, the areas of the pad electrodes  27  are arranged so as to be crossed by a line U (part (h) of  FIG.  13   ) inclined by an angle (γ) which is 10 degrees or more (β) and 60 degrees or less (α), and further preferably 30 degrees or more and 35 degrees or less, with respect to the direction W from the first portion  20   a  toward the second portion  20   b  of the ink cartridge  20 , as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 . As to the case in which the angle formed between the line U and the direction W from the first portion  20   a  toward the second portion  20   b  of the ink cartridge  20  is the largest as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 , as indicated by line T in part (h) of  FIG.  13    is the largest, the angle (α) formed between the direction W and the line T is preferably 40 degrees or more and 60 degrees or less. On the other hand, as to the case in which the angle formed between the line (U) and the direction (W) from the first portion  20   a  toward the second portion  20   b  of the ink cartridge  20  is the largest as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 , as indicated by line T in part (h) of  FIG.  13    is the smallest, the angle (α) formed between the direction (W) and the line T is preferably 10 degrees or more and 20 degrees or less. The direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20  can also be considered as the longitudinal direction of the ink cartridge  20 . 
     In addition, it is preferred that the plurality of pad electrodes  27  have the areas arranged so as to be crossed by a line U (part (h) of  FIG.  13   ) inclined with respect to the inserting direction of the ink cartridge  20 , as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 . In addition, it is preferred that the plurality of pad electrodes  27  have the areas arranged so as to be crossed by a line U (part (h) of  FIG.  13   ) inclined by an angle (γ) which is 10 degrees or more (β) and 60 degrees or less (α), with respect to the inserting direction of the ink cartridge  20 , as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 . In addition, it is preferred that the plurality of pad electrodes  27  have the areas arranged in the direction crossing the inserting direction of the ink cartridge  20  at an angle (γ) which is 20 degrees or more (β) and 40 degrees or less (α), that is, the areas of the pad electrodes  27  are arranged so as to be crossed by a line inclined by an angle (γ) which is 20 degrees or more (β) and 40 degrees or less (α), with respect to the inserting direction of the ink cartridge  20 , as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 . It is further preferred that the angle (γ) is 30 degrees or more and 35 degrees or less. As to the case in which the angle formed between the line (U) and the inserting direction of the ink cartridge  20  is the largest as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 , as indicated by line T in part (h) of  FIG.  13    is the largest, the angle (α) formed between the inserting direction and the line T is preferably 40 degrees or more and 60 degrees or less. On the other hand, as to the case in which the angle formed between the line (U) and the inserting direction of the ink cartridge  20  is the largest as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 , as indicated by line T in part (h) of  FIG.  13    is the smallest, the angle (α) formed between the inserting direction and the line T is preferably 10 degrees or more and 20 degrees or less. 
     In addition, it is preferred that the plurality of pad electrodes  27  have the areas arranged in the direction crossing the longitudinal direction of the ink cartridge  20 , that is, the areas of the pad electrodes  27  are arranged so as to be crossed by a line inclined with respect to the longitudinal direction of the ink cartridge  20 , as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 . In addition, it is preferred that the plurality of pad electrodes  27  have the areas arranged in the direction crossing the longitudinal direction of the ink cartridge  20  at an angle (γ) which is 20 degrees or more (β) and 40 degrees or less (α), that is, the areas of the pad electrodes  27  are arranged so as to be crossed by a line inclined by an angle (γ) which is 20 degrees or more (β) and 40 degrees or less (α), with respect to the longitudinal direction of the ink cartridge  20 , as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 . It is further preferred that the angle (γ) is 30 degrees or more and 35 degrees or less. 
     Also, it is preferred that the pad electrode  27  closest to the first portion  20   a  among the plurality of pad electrodes  27  has the area of the pad electrode  27  at a position of 5 mm or more and 15 mm or less away from the first portion  20   a  as measured in a direction parallel to the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20 . Further preferably, it is 10 mm or more and 11 mm or less away from the first portion  20   a . On the other hand, it is preferred that the pad electrode  27  most remote from the first portion  20   a  has the area of the pad electrode  27  at a position of 15 mm or more and 25 mm or less away from the first portion  20   a  as measured in a direction parallel to the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20 . Further preferably, it is 17 mm or more and 18 mm or less away from the first portion  20   a . Here, the pad electrode  27  closest to the first portion  20   a  means the pad electrode  27  including the portion closest to the first portion  20   a  among the plurality of pad electrodes  27 . In addition, the pad electrode  27  furthest from the first portion  20   a  means the pad electrode  27  including a portion most remote from the first portion  20   a  among the plurality of pad electrodes  27 . 
     In the case where the electrical connection on the mounting portion side is a connector pin, it is preferred that the pad electrode  27  extends from the electrical contact point along the moving direction of the pad electrode  27 . In particular, it is preferred that the longitudinal direction of the pad electrode  27  is along the moving direction of the pad electrode  27  from the electrical contact point. The reason for this is as follows. The connector pin moves toward the electrical contact point while being in contact with the pad electrode  27 , so that dust and the like adhering to the pad electrode  27  can be removed. And, after the state is established in which the electrical contact points a substantially free of dust or the like, the pad electrodes  27  and the connector pins make final contact with each other at the electrical contact points. For this reason, it is preferred that the pad electrode  27  extends from the electrical contact point along the moving direction of the pad electrode  27  so that a portion where dust or the like has been sufficiently removed can be made as an electrical contact point. 
     Also, it is preferred that the length of the pad electrode  27  from the electrical contact point (the distance the pad electrode  27  extends or the shortest distance from the electrical contact point to the end of the pad electrode  27 ) is 0.5 mm or more. Further preferably, it is 1.0 mm or more. From the stand point of the space, it is preferable that the length of the pad electrode  27  from the electrical contact point is 4.0 mm or less. As for these lengths, all of the plurality of pad electrodes  27  may satisfy, or at least one pad electrode  27  may satisfy. 
     Here, each connector pin may be constituted to extend in a direction crossing (inclining) the moving direction of the pad electrode  27  (structure in which the longitudinal direction of the connector pin crosses with the moving direction of the pad electrode). However, this may result in that the surface of the connector pin rides on the side edge (step) of the pad electrode  27  of the electrode portion  26 , and the reliability of the connector pin or the pad electrode  27  may be deteriorated. On the other hand, in order to avoid such a liability, the shape and arrangement of the connector pins are complicated, and the occupied space will be large. 
     In the case where the electrode portion  26  has a plurality of pad electrodes  27 , the moving direction of the pad electrode  27  may be regarded as the moving direction of the electrode portion  26 . 
     In addition, it is preferred that the inclinations and angles in the two directions described above are satisfied by all of the pad electrodes  27  among the plurality of pad electrodes  27  of the ink cartridge. 
     Next, the description will be made as to the desirable number, size, arrangement, and so on of the pad electrode  27  in consideration of mounting of the ink cartridge. First, it is preferred that the ink cartridge has four or more pad electrodes  27 . Parts (a)-(h) of  FIG.  13    shows an example in which the ink cartridge has four pad electrodes (two for an electric power supply line for enabling access to the information stored in the memory element of the electrode portion  26 , and two for informational line), it is further preferable that the ink cartridge has four pad electrodes  27 . More specifically, the four pad electrodes include a grounding pad electrode for providing a reference potential of the circuit and always having an electric potential of 0, a clock signal pad electrode for providing a reference for the minimum unit of data transmission and providing pulses at a constant frequency, an electric power supply pad electrode for actuating IC and the like and having a positive potential, and a data signal pad electrode for actuating the circuit by feeding binary signal in accordance with data. In  FIG.  18   , the shown pad electrodes are the grounding pad electrode, the clock signal pad electrode, the electric power supply pad electrode, and the data signal pad electrode, in the order named from the top of this Figure. It is preferable that the grounding pad electrode is larger than the other electrode. This is because it is preferable that the grounding pad electrode is first assuredly connected to make the reference potential constant so that the operations are stabilized. Referring to part (g) of  FIG.  13   , the lateral width of the plurality of pad electrodes  27  will be described. As shown in part (g) of  FIG.  13   , the lateral width of the plurality of pad electrodes  27  is a length measured between the laterally inside end portions ( 27   d ,  27   e ) of the most laterally outside pad electrodes  27  (the pad electrodes  27   b ,  27   c ) along a straight line passing through all the pad electrodes  27  as described above (the portion indicated by a reference character An in part (g) of  FIG.  13   ). The lateral width of the plurality of pad electrodes  27  is preferably 5 mm or more and 10 mm or less, further preferably 6 mm or more and 9 mm or less, even further preferably 7 mm or more and 8 mm or less. 
     Embodiment 4 
     In Embodiment 3, the projecting portion of the ink cartridge (the side surface of the projecting portion) is in contact with the positioning wall of the mounting portion while moving the projecting portion along the positioning wall, so that the screw rotation mounting is executed. By this screw rotation mounting, the pad electrode of the electrode portion provided on the projecting portion moves in a direction different from the inserting direction with the first portion (and the insertion portion) of the ink cartridge at the leading side, so that they are electrically connected to electrical connections. 
     In Embodiment 4, a guide portion for facilitating screw rotation mounting is provided on the ink cartridge, and the screw rotation is carried out using this guide portion. 
       FIG.  14    shows then ink cartridge including the guide portion. The guide portion  29  is provided in the third portion  20   c  of the ink cartridge. The guide portion  29  is a groove extending along the rotational direction at the time of mounting. Here, the guide portion  29  is a screw shaped groove (part of a screw shape). One guide portion  29  may be provided, or a plurality guide portions  29  may be provided. In  FIG.  14   , a second guide portion  38  different from the guide portion  29  is provided at a position opposite to the guide portion  29  of the ink cartridge. The second guide portion  38  is a groove independent from the guide portion  29  (not connected). Here, the guide portion  29  and the second guide portion  38  are provided on the cover member  78  shown in Parts (a) and (b) of  FIG.  7   . In addition, the guide portion  29  and the second guide portion  38  are provided in the large diameter portion of the ink cartridge. The pad electrode  27  is provided in the small diameter portion, but the guide portion  29  is provided in the large diameter portion, and therefore, the extending direction of the guide portion  29  and the moving direction of the pad electrode  27  are not strictly the same. However, these directions are substantially the same, and the guide portion  29  has a shape extending along the moving direction of the pad electrode  27  (and the rotational direction of the ink cartridge  20 ) at the time of mounting. Therefore, the extending direction of the guide portion  29  can also be considered as the moving direction of the pad electrode  27  or the rotational direction of the ink cartridge  20 . 
     The guide portion  29  and the second guide portion  38  are open at the end of the large diameter portion (the opening  29   a , the second opening  38   a ) at the connecting portion between the large diameter portion and the small diameter portion. It is preferred that the opening  29   a  and the second opening  38   a  are located at diametrically opposite positions of the ink cartridge  20 . In addition, it is preferred that the second opening  38   a  is disposed on a line extending from the opening  29   a  through the center of gravity of the ink cartridge  20  in a cross-section perpendicular to the longitudinal direction of the ink cartridge  20 . 
     Referring to parts (a) to (c) of  FIG.  15   , the mounting operation of the ink cartridge  20  using the guide portion  29  and the second guide portion  38  will be described. Here, although the mounting operation using the two guide portions will be explained, for example, but only one guide portion  29  may be used. 
     First, the ink cartridge  20  is inserted in the inserting direction relative to the recording apparatus until the state shown in part (a) of  FIG.  15    is reached. The operation so far is basically the same as that explained in part (a) of  FIG.  11   . However, in part (a) of  FIG.  15   , the lock pin  30  of the electrical connecting portion peripheral portion  23  of the mounting portion is inserted into the guide portion  29 . The lock pin  30  is inserted into the guide portion  29  through the opening  29   a  of the guide portion  29 . Similarly, the second lock pin  39  is inserted into the second guide portion  38  through the second opening  38   a  of the second guide portion  38 . 
     The lock pin  30  and the second lock pin  39  are guide portions of the mounting portion and have respective pin shapes. It is preferred that the ends of the lock pins (end portions on the side of being inserted into the guide portions  29 ,  38 ) are semispherical. In addition, it is preferred that the lock pin  30  and the second lock pin  39  press the ink cartridge  20 . In Parts (a)-(c) of  FIG.  15   , the ink cartridge  20  is sandwiched between the lock pin  30  and the second lock pin  39  to press the ink cartridge  20 , respectively. By this, the ink cartridge  20  does not easily move relative to the mounting portion, and therefore, the accuracy of mounting of the ink cartridge  20  is enhanced. As described above, it is preferred that the ink cartridge  20  is sandwiched between the lock pin  30  and the second lock pin  39 . Therefore, it is preferred that the guide portion  29  and the second guide portion  38  corresponding to the lock pin  30  and the second lock pin  39  are located diametrically opposite to each other of the ink cartridge  20 . That is, it is preferred that the second guide portion  38  is disposed on a line extending from the guide portion  29  through the center of gravity in the cross-section perpendicular to the longitudinal direction of the ink cartridge  20 . 
     Parts (a) and (b) of  FIG.  16    shows the positional relationship between the two guide portions and the lock pin. Part (a) of  FIG.  16    shows the ink cartridge  20  as viewed from obliquely above the electrical connecting portion peripheral part  23 , and part (b) of  FIG.  16    shows the ink cartridge  20  as viewed from the insertion portion  24  side. As shown in parts (a) and part (b) thereof of  FIG.  16   , the lock pin  30  and the second lock pin  39  are disposed in the positions opposed to each other, and the guide portion  29  and the second guide portion  38  corresponding thereto are also disposed at positions where the ink cartridge  20  faces to each other. 
     The ink cartridge  20  is rotated by the screw from the state where the guide portion of the mounting portion and the guide portion of the ink cartridge  20  are engaged with each other, as shown in part (b) of  FIG.  16   , and the ink cartridge  20  is rotated while advancing the ink cartridge  20  in the inserting direction. As shown in part (a) of  FIG.  15    to part (b) of  FIG.  15   . At this time, the lock pin  30  is restricted by the guide portion  29 , and therefore, the direction of the screw rotation is determined by the guide portion  29 , and the projecting portion  25  is guided between the positioning walls  23   a  and  23   b . Moreover, when the rotating operation is further carried out, the mounting completed state of part (c) in  FIG.  15    is reached, but immediately before that, the lock pin  30  rides over the guide portion rib  29   b  disposed inside the groove of the guide portion  29 . By this, when the user grips the ink cartridge  20 , the user feels a click and can be informed of the completion of the mounting. Similarly, the guide portion ribs may be provided in the second guide portion  38 . 
     The projection  25  and the positioning walls  23   a ,  23   b  may be in contact with each other also during rotation using the guide portion  29 . By using the contact between the projecting portion  25  and the positioning walls  23   a ,  23   b  in addition to the guide portion  29  and the second guide portion  38  and the lock pin, the screw rotation is more stable. 
     Here, the rotation using the guide portion  29  is not limited to the screw rotation, and also when rotating in the inserting direction of the ink cartridge  20  as in Embodiment 1 without insertion thereof, the guide portion  29  may be used. 
     The ink cartridge  20  may be provided with a groove other than the guide portion  29 . For example, as shown in part (a) of  FIG.  17   , the groove  31  may be provided along the guide portion  29 . 
     In the case where the guide portion  29  of the ink cartridge  20  is a groove, it is preferable that the depth of the guide portion  29  is 1.0 mm or more and 5.0 mm or less, considering the function as a guide for rotation. The depth of the guide portion  29  is further preferably 2.0 mm or more and 4.0 mm or less. Here, it is preferred that in the portion where the guide portion rib  29   b  is provided inside the guide portion, the depth of the guide portion is shallow, corresponding to the provision of the guide portion rib  29   b , the depth of the guide portion is 0.4 mm or more, 0.6 mm or less. It is preferred that the height of the guide portion rib  29   b  is 1.5 mm or more and 2.0 mm or less. Here, it is preferred that when the height of the guide portion rib  29   b  is X and the depth of the guide portion  29  is Y, X&lt;Y is satisfied. By satisfying the inequality X&lt;Y, it is possible to prevent the guide portion rib  29   b  from projecting out of the guide portion  29 . 
     It is preferred that the extending direction of the guide portion  29  of the ink cartridge is inclined by 50 degrees or more and 80 degrees or less with respect to the direction from the first portion  20   a  toward the second portion  20   b  of the ink cartridge  20 . Further preferably, it is 60 degrees or more. Even further preferably, it is less than 70 degrees. In Parts (a)-(c) of  FIG.  15   , the direction from the first portion  20   a  toward the second portion  20   b  of the ink cartridge  20  is the same as the longitudinal direction of the ink cartridge  20 . 
     In addition, the extending direction of the guide portion in this specification is considered as follows. First, the ink cartridge  20  is viewed from the direction facing the pad electrode  27 . The extending direction of the guide portion  29  as viewed in this direction is defined as the extending direction of the guide portion  29 . The guide portion  29  shown in Parts (a)-(c) of  FIG.  15    extends in the form of a screw and is not a perfect straight line when sing the guide portion  29  from the side opposed to the pad electrode  27 , but in such a case, a straight line (approximate straight line) is assumed. In addition, even when the shape and width of the guide portion  29  vary depending on the location, the extension direction of the guide portion  29  is considered as the extension direction of the approximate straight line of the guide portion  29 . In  FIG.  18   , the extending direction of the guide portion  29  as viewed from the side facing the pad electrode  27  is indicated by a solid arrow A. In addition, the direction in which the electrical contact points of the pad electrodes  27  are arranged is indicated by the dotted line B. The extending direction of the guide portion  29  and the direction in which the electrical contact points of the pad electrodes  27  are arranged are inclined and cross with each other at an angle C at the position of the crossing between the two directions. 
     Next, the relationship between the extension direction of the guide portion  29  of the ink cartridge  20  and the direction in which the electrical contact points of the pad electrodes  27  are arranged will be described. As described above, the guide portion  29  has a shape corresponding to the rotational direction at the time of mounting, and has a shape extending along the rotational direction and the moving direction of the pad electrode  27 . That is, the extending direction of the guide portion  29  can be considered in the same way as the moving direction of the pad electrode  27  in rotational mounting. From this standpoint, it is preferred that the direction in which the electrical contact points of the pad electrodes  27  are arranged is a direction crossing the extending direction of the guide portion  29 . 
     It is preferable that the electrical contact points of the pad electrodes  27  be arranged at an angle of 60 degrees or more with respect to the extending direction of the guide portion  29 , further preferably it is arranged at the angle of 70 degrees or more, and even further preferably it is arranged at the angle of 75 degrees or more. In addition, it is preferred that the electrical contact points of the pad electrodes  27  are inclined by 85 degrees or less (with an inclination of 85 degrees or less) with respect to the extending direction of the guide portion  29 . Here, considering that the guide portion is in the large diameter portion and the pad electrode is in the small diameter portion, the direction in which the electrical contact points of the pad electrodes are arranged and the extending direction of the guide portions are not perpendicular to each other, similarly to the relationship between the direction in which the electrical contact points of the pad electrodes are arranged and the direction of movement of the pad electrodes. 
     For the multiple pad electrodes  27 , the plurality of pad electrodes  27  have the areas arranged so as to be crossed by a line U (part (h) of  FIG.  13   ) inclined with respect to the extending direction of the guide portion  29 , as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 . The plurality of pad electrodes  27  preferably have the areas arranged in the direction inclined relative to the extending direction of the guide portion  29 , that is, the areas of the pad electrodes  27  are arranged so as to be crossed by a line U (part (h) of  FIG.  13   ) inclined by an angle which is 60 degrees or more, further preferably 70 degrees or more, and even further preferably 75 degrees or more with respect to the extending direction of the guide portion  29 , as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 . Moreover, it is preferred that the angle is 85 degrees or less (with an inclination of 85 degrees or less) with respect to the extending direction of the guide portion  29 . 
     It is preferred that a portion of the guide portion  29  on the side of the second portion  20   b  is disposed at a position of 35 mm or more and 60 mm or less away from the first portion  20   a , as measured in a direction parallel to the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20 . In addition, it is further preferable that it is disposed at a position of 45 mm or more and 50 mm or less away from the first portion  20   a . The portion of the guide portion  29  on the side of the second portion  20   b  is the end portion on the side opposite to the opening  29   a  of the guide portion  29  when the opening  29   a  side of the guide portion  29  is deemed as the starting point of the guide portion  29 . In addition, when the opening  29   a  is oriented, the position of the portion on the side of the first portion  20   a  of the guide portion  29  is the same as the position of the opening  29   a . The opening  29   a  is separated from the first portion  20   a  by the length of the small diameter portion. That is, it is preferred that the portion of the guide portion  29  on the side of the first portion  20   a  is disposed at a position of 20 mm or more and 30 mm or less away from the first portion  20   a , as measured in a direction parallel to the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20 . 
     It is preferred that the position of the center of gravity of the guide portion rib  29   b  is disposed at a position of 40 mm or more and 50 mm or less from the first portion  20   a  in a direction parallel to the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20 . 
     The shape of the guide portion is not limited to the shape shown in  FIG.  14   . For example, as shown in part (b) of  FIG.  17   , it may have steps, that is, the stair shaped guide portion  40 . 
     In addition, the guide portion  29  need not be a groove, and it may be a projection guide portion  41  including a projection shape as shown in part (c) of  FIG.  17   . The projection guide portion  41  shown in part (c) of  FIG.  17    is a guide portion has a shape of a lock pin projecting from the third portion  20   c  of the ink cartridge. In this case, the guide portion on the mounting portion side has, for example, a groove shape, and the projection guide portion  41  of the ink cartridge is inserted into the groove shaped guide portion on the mounting portion side, and the ink cartridge  20  can be rotated along the guide portion on the mounting portion side. This mounting is shown in Parts (a)-(d) of  FIG.  19   . 
     In Parts (a)-(d) of  FIG.  19   , the groove-shaped guide portion  42  on the mounting portion side is indicated by a dotted line. First, as shown in part (a) of  FIG.  19   , the ink cartridge is inserted in the inserting direction until the position where the projection guide portion (lock pin)  41  on the ink cartridge side fits in the groove-shaped guide portion  42  on the mounting portion side as shown in part (a). Thereafter, the ink cartridge is rotated as shown in parts (b) to (d) of  FIG.  19   , and the mounting of the ink cartridge is completed. 
     Regarding the above-described depth, position, and extending direction of the guide portion  29 , the same applies to the second guide portion  38 . In addition, it is preferred that the guide portion  29  and the second guide portion  38  have symmetrical shapes with respect to each other. 
     Embodiment 5 
     In Embodiment 5, a gap (space) is provided below the pad electrode. The ink cartridge in Embodiment 5 is shown in Parts (a)-(d) of  FIG.  20   . 
     Part (a) of  FIG.  20    is a general arrangement of the ink cartridge. The ink cartridge  20  shown in part (a) of  FIG.  20    has the electrode portion  26  on the projecting portion  25 . The electrode portion  26  has a plurality of pad electrodes  27 . Up to this point, the structure is as explained in the previous embodiments, but in Embodiment 5, the projecting portion  25  is partially hollowed out, so that the projecting portion  25  has the gap (space)  32 . The gap (space)  32  is provided below the pad electrode  27 . Below the pad electrode  27  is based on a direction from the pad electrode  27  toward the center of gravity in a cross-section of the ink cartridge  20  taken along a direction perpendicular to the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20 . 
     Part (b) of  FIG.  20    is an enlarged view of the periphery of the electrode portion  26  of the ink cartridge shown in part (a) of  FIG.  20   , as seen from the side surface side of the ink cartridge  20 . There is provided a gap (space)  32  below the pad electrode of the electrode portion  26 . The gap (space)  32  opens toward the insertion portion  24  (the first portion  20   a ) side of the projecting portion  25 . There is no opening of the gap (space)  32  on the side of the second portion  20   b  of the projecting portion  25  (cantilevered configuration, in this example). The gap  32  is a space formed by the wall of the projecting portion  25  and is surrounded by the wall of the projecting portion  25  except a part thereof. A part of the projection  25  not surrounded by the wall is the opening of the gap (space)  32 . 
     Part (c) of  FIG.  20    is a view of the periphery of the electrode portion  26  of the ink cartridge shown in part (a) of  FIG.  20    as viewed from the first surface  20   a  (and the insertion portion  24 ) side. 
     Part (d) of  FIG.  20    is a cross-sectional view of the ink cartridge taken along line A-A′ of part (c) of  FIG.  20   , and is a view of the cross-section of the ink cartridge as seen from above the projecting portion  25 . Part (d) of  FIG.  20    shows a state in which the projecting portion  25  is cut, and the space surrounded by the projecting portion  25  is the gap (space)  32 . The projecting portion  25  covers the space above the gap (space)  32 , and the electrode portion and the pad electrode are provided on a table (tray) provided at the top thereof. 
     A supporting member (not shown in Parts (a)-(d) of  FIG.  20   ) of the mounting portion is inserted into the gap (space)  32 . By this, the pad electrode  27  on the gap (space)  32  is supported on the support member at the lower side, and therefore, downward movement is restricted. In particular, the pad electrode  27  is pushed from above by the electric connecting portion such as the connector pin, which is supported on the support member at the bottom, and therefore, the pad electrodes  27  is sandwiched in the vertical direction, and the damage to the pad electrode  27  can be suppressed. In addition, the position of the pad electrodes  27  can be stabilized and satisfactory connection can be assured. The sandwiching of the pad electrodes  27  can be effected by the electric connecting portion and the surface opposite to the side contacting the electric connecting portion of the ink cartridge. That is, in the case of  FIG.  20   , the entire small-diameter portion of the ink cartridge can be sandwiched in the vertical direction of part (c) of  FIG.  20   . It is preferred that a gap (space)  32  is provided under the pad electrodes  27 , and the pad electrodes  27  are sandwiched between the electrical connecting portion and the support member inserted in the gap (space)  32 . By using the electrical connecting portion and the support member inserted in the gap (space)  32 , the pad electrode  27  can be sandwiched in a closer position, and therefore, the relative position between the pad electrode  27  and the electrical connecting portion is more stable. When sandwiching the pad electrodes  27  by sandwiching the entire small diameter portion, it is not easy to stabilize the relative position between the pad electrodes  27  and the electric connecting portion because the diameter of the small diameter portion is large at the time of consideration of the sandwiching of the pad electrodes  27 . 
     For example, a part of the hole forming member  14   b  can be used as the supporting member of the mounting portion. As shown in part (a) of  FIG.  4   , when the hole forming member  14   b  covers the electric connecting portion  22 , the hole forming member  14   b  covering the electric connecting portion  22  is used as a supporting member, and this supporting member is inserted into the gap (space)  32  of the ink cartridge. 
     Referring to  FIG.  21    and Parts (a)-(d) of  FIG.  22   , the state of mounting the ink cartridge in Embodiment 5 will be described.  FIG.  21    is a view of the hole forming member  14   b  of the mounting portion of the recording apparatus as viewed from the side opposite to the side where the ink cartridge is inserted. A part of the hole forming member  14   b  is a projecting plate-shaped wall portion  14   e . The wall portion  14   e  which is a part of the hole forming member  14   b  functions as the above-mentioned supporting member. Above the hole forming member  14   b , the electrical connecting portion peripheral portion  23  including the electrical connecting portion  22  constituted by the connector pins is disposed. Here, in  FIG.  21   , the positioning wall is omitted and not shown, for better illustration. 
     Part (a)-(d) of  FIG.  22    shows the process of mounting the ink cartridge in the hole forming member  14   b  of  FIG.  21   . The ink cartridge  20  gradually rotates from the state shown in part (a) of  FIG.  22   . And, from the state of part (c) of  FIG.  22    to the state of part (d) of  FIG.  20   , the wall portion  14   e  as the support member is inserted into the space  32  under the pad electrode  27 . 
     Parts (a)-(c) of  FIG.  23    schematically shows the state of mounting the ink cartridge described with reference to Parts (a)-(d) of  FIG.  22   . As the ink cartridge  20  is rotated from the state shown in part (a) of  FIG.  23   , the wall portion  14   e  as the support member is inserted into the gap (space)  32  under the electrode portion  26  including the pad electrode from the state of part (b) of  FIG.  23    to the state of part (c) of  FIG.  23   . 
     Referring to  FIG.  24    and Parts (a)-(d) of  FIG.  25   , the state of mounting of the ink cartridge as viewed from above the mounting portion will be described.  FIG.  24    is a view illustrating the mounting portion. The parts (a)-(d) of  FIG.  25    show the mounting process in the cross-section taken along line A-A′ of  FIG.  24   . As shown in parts (a) to (d) of  FIG.  25   , the electrode portion  26  including the pad electrodes  27  enters between the electric connecting portion  22  and the wall portion  14   e , and the wall portion  14   e  as the supporting member is inserted into the gap (space)  32  below the electrode portion  26  including the pad electrode  27 . In addition, during this period, the pad electrode  27  is moved to a position where it is sandwiched between the positioning walls  23   a ,  23   b.    
     In addition to stabilizing the positional relationship between the electrical connecting portion  22  and the pad electrode  27 , the gap (space)  32  can also perform another function. For example, heat may be produced at the electrical contact point between the electrical connecting portion  22  and the pad electrode  27 . In order to stabilize the supply of ink, it is preferred that this heat does not affect the ink receiving tube  21  and the insertion portion  24 . The gap (space)  32  provided under the pad electrode  27  can serve as a heat radiation member. That is, the heat generated at the electrical contact point can escape to the outside through the gap (space)  32 . 
     On the other hand, when the ink cartridge  20  is formed of a member with high heat conductivity, the gap (space)  32  functions as a heat insulating member on the contrary, so that the heat generated at the electrical contact point is not easily transferred onto the ink receiving tube  21  and the insertion portion  24 . 
     The gap (space)  32  may not be provided under all the pad electrodes  27  of the plurality of pad electrodes  27 . For example, the space  32  may not be provided at some portion below the pad electrodes  27 . Or, in a part of a certain pad electrode  27 , the space  32  may not be provided therebelow. It is preferred that the part constituting the outer periphery of the gap (space)  32  has a maximum length of one side of 10 mm or more and 15 mm or less. The part constituting the outer periphery of the gap (space)  32  includes lines constituting the outer periphery of the gap (space)  32  when the gap (space)  32  is viewed from the side (upper side) opposed to the pad electrode  27 . That is, it is preferred that among the lines constituting the outer periphery of the gap (space)  32  as viewed in the direction shown in part (d) of  FIG.  20   , the maximum length of the straight side is 10 mm or more and 15 mm or less. 
     It is preferred that the height of the gap (space)  32  is 1 mm or more and 5 mm or less. The height of the gap (space)  32  is further preferably 2 mm or more. In addition, it is preferably 3 mm or less. Here, the height of the gap (space)  32  is the height in the vertical direction from the surface of the third surface  20   c , and the height in the vertical direction of the gap (space)  32  in part (b) of  FIG.  7    and part (c) of  FIG.  23   . If there are parts with different heights in the gap (space)  32 , it is the average value of the heights at 100 points randomly distributed in the gap (space)  32 . 
     In addition, the gap (space)  32  may have a shape in which the lower part of the gap (space)  32  is open. That is, there may be a space below the pad electrode, and the structural members of the ink cartridge do not exist under the space. 
     The gap (space)  32  may have a space as an ink cartridge in a state where the ink cartridge is mounted on the mounting portion. For example, before mounting in the mounting portion, the gap (space)  32  may be filled with a certain member and a void may be formed by retracting the member in the process of mounting, and in such a case, the ink cartridge is regarded as including a gap (space) in a mounted state in which the member is in the retracted state. In addition, as described above, even when a support member which is a member other than the ink cartridge is inserted into the gap (space) and the gap (space) is filled, the ink cartridge has the gap (space). The gap (space)  32  can also be referred to as a recess portion of the ink cartridge. 
     Referring to  FIG.  39   , the position of the gap (space)  32  and the pad electrodes  27  and so on will be described.  FIG.  39    is an enlarged view of the first portion side  20   a  of the ink cartridge. In the first portion  20   a , the insertion portion (ink discharging portion)  24  is provided. In  FIG.  39   , it seems that the insertion portion  24  is provided at a position retracted from the position indicated by the first portion  20   a , but this is because the insertion portion  24  is located slightly backward, as shown in part (a) of  FIG.  20   , for example. The axis of the ink cartridge  20  extending with the shortest distance from the insertion portion  24  to the second portion (here, the axis extending along the longitudinal direction and perpendicular to the first portion  20   a ) is defined as an axis A. It is preferred that the length in the direction perpendicular to the third surface  20   c  from the axis A to the pad electrode  27  (the length indicated by B in  FIG.  39   , hereinafter the length B) is 15 mm or more and 20 mm or less. Further preferably, it is 16 mm or more and 18 mm or less. By selecting the length B within this range, the mounting of the ink cartridge is stabilized. Here, in the case that the gap (space)  32  is provided, the height of the gap (space)  32  is included in the length B. 
     Also, similarly from the standpoint of mounting ink cartridges, it is preferred that the linear distance (the length of a portion indicated by a dotted line in  FIG.  39   ) from the insertion portion  24  to the pad electrode  27  is 15 mm or more and 25 mm or less. It is preferred that all of the pad electrodes  27  are provided at positions falling within this range. Here, this linear distance is the length of the shortest straight line connecting the center of the insertion portion  24  with the position closest to the center of the insertion portion  24  of the pad electrode  27 . In addition, it is preferred that there are a plurality of pad electrodes  27 , among which the difference in linear distance from the insertion portion  24  between the pad electrode near the center of the insertion portion  24  and the pad electrode most remote from the insertion portion  24  is 2 mm or more and 4 mm or less. For the numerical values explained in  FIG.  39   , if any area of the pad electrode  27  satisfy the, the effect is satisfactorily provided. In particular, the center of gravity of the pad electrode  27  and the electrical contact point preferably satisfy these numerical values in order to provide the effect. 
     Embodiment 6 
     Heretofore, a circular cylindrical ink cartridge has been illustrated and described. However, as described above, the shape of the ink cartridge is not limited to a circular cylindrical shape. For example, as shown in part (a) of  FIG.  26   , a quadrangular prism shaped ink cartridge may be used. 
     Referring to Parts (a)-(c) of  FIG.  26   , a process of mounting an ink cartridge including a quadrangular prism shape to a mounting portion (not shown in Parts (a)-(c) of  FIG.  26   ) will be described. 
     First, the ink cartridge is inserted straight along the inserting direction with the first portion  20   a  at the leading side. This state is shown in part (a) of  FIG.  26   . And, as shown in part (b) of  FIG.  26    and part (c) of  FIG.  26   , the ink cartridge  20  is rotated in the same manner as explained in the previous embodiments. Due to this rotation, the pad electrodes  27  of the electrode portion  26  move in the different direction with respect to the inserting direction of the ink cartridge  20 . And, the pad electrode  27  comes into contact with the electrical connecting portion of the mounting portion and is electrically connected thereto. 
     Here, the ink cartridge  20  may have a polygonal column shape other than a quadrangular prism, a conical shape, or a polygonal pyramid shape. 
     Embodiment 7 
     In Embodiment 7, the portion of the ink cartridge on the side of the first portion  20   a , that is, the tip portion, rotates independently of the casing. Parts (a)-(d) of  FIG.  27    shows an example of how such an ink cartridges is mounted on ink cartridge mounting portion. Here, in Parts (a)-(d) of  FIG.  27   , the mounting portion is omitted for better illustration. 
     Part (a) of  FIG.  27    is a view illustrating an ink cartridge before being mounted on the mounting portion. The ink cartridge  20  includes the insertion portion  24  in the front first portion  20   a . The ink cartridge  20  is inserted in the inserting direction into the hole formed by the hole forming member of the mounting portion as shown above with the first portion  20   a  at the leading side. At the initial stage of insertion, the ink cartridge  20  is inserted into the hole of the hole forming member while maintaining the state shown in part (a) of  FIG.  27   . 
     Next, from the point of time when the ink cartridge  20  is inserted to some extent, the tip of the ink cartridge starts to rotate as shown in part (b) of  FIG.  27   . This rotation can be carried out using the lock pin and the guide portion described above, for example. In addition, for example, a member capable of rotating the tip portion may be provided in the ink cartridge  20 , and the tip portion may be rotated by manually rotating this member by the user. 
     Further, the rotation continues  27  by the way of the state shown in part (c) of  FIG.  27    until finally reaching the state shown in part (d) of  FIG.  27   . The casing does not rotate and may be fixed during this rotating operation. Or, the casing does not rotate, and it may just be inserted in the inserting direction. On the other hand, since the tip portion rotates, the pad electrodes  27  provided at the tip portion rotate in the same way as the tip portion. That is, when looking at the ink cartridge as a whole, the pad electrode  27  moves in a moving direction different from the inserting direction (here, the inserting direction of the casing) with the first portion  20   a  at the leading side. This movement allows the pad electrodes  27  to connect with the electrical connecting portion. 
     Here, in Parts (a)-(d) of  FIG.  27   , the casing of the ink cartridge  20  is formed into a quadrangular prism shape, and the tip portion has likewise a quadrangular prism shape. The shape of the ink cartridge  20  is not limited to this, and it may be, for example, a circular cylindrical shape or a triangular prism shape as described above, or a tip portion. In addition, the combination of the shapes of the casing and the tip portion is also not particularly limited, and combinations of shapes different from each other may be used, for example, the casing has a columnar shape and the tip portion has a quadrangular prism shape. 
     Embodiment 8 
     In this embodiment, the rotation of the ink cartridge is carried out by using a grip portion provided on the ink cartridge (Parts (a)-(c) of  FIG.  28   ). In Parts (a)-(c) of  FIG.  28   , a part of the structure of the mounting portion is omitted, for better illustration. 
     First, the ink cartridge  20  including a gripping portion  33  is prepared. This ink cartridge  20  is inserted along the inserting direction into the hole of the hole forming member of the mounting portion up to the state as shown in part (a) of  FIG.  28   . 
     Next, the user grips the grip portion  33 , or a member of the recording device grips the gripping portion  33  and rotates the ink cartridge  20 . As described above, as shown in part (b) of  FIG.  28    and part (c) of  FIG.  28   , the pad electrodes  27  of the electrode portion  26  is electrically connected to the electrical connecting portion by rotating the ink cartridge  20 . Here, even when inserting the ink cartridge  20  along the inserting direction, the ink cartridge  20  may be inserted using the grip portion  33 . 
     Also when the ink cartridge  20  is rotated using the grip portion  33 , it may be rotated using the positioning wall and the guide portion described above, or may be rotated without using them. When these members are not used, a mark is provided on the ink cartridge  20 , and with this mark as index, the user can grip the grip portion  33  and start the rotation of the ink cartridge  20 . 
     It is preferred that the grip portion  33  is provided on a portion of the ink cartridge  20  opposite to the side including the insertion portion  24 , that is, on a side closer to the second portion  20   b  than the first portion  20   a . In addition, it is preferable to provide it in the third portion  20   c , and the recess portion is formed by partially recessing the third portion  20   c , and the recess portion can serve as the grip portion  33  as shown in Parts (a)-(c) of  FIG.  28   , for example. 
     It is preferred that two gripping portions  33  are provided on the ink cartridges  20  at positions facing to each other. Or, the diameter of the second portion  20   b  side of the ink cartridge  20  may be reduced over the entire circumference, and the reduced portion may be used as the grip portion. It is preferred that the depth of the grip portion  33  is 5 mm or more and 15 mm or less. Further preferably, it is 6 mm or more, 13 mm or less. 
     In addition, it is preferred that the portion of the gripping portion  33  on the side of the first portion  20   a  is disposed at a position of 190 mm or more and 210 mm or less away from the first portion  20   a , as measured in a direction parallel to the direction from the first portion  20   a  to the second portion  20   b  of the ink cartridge  20 . On the other hand, it is preferred that the portion of the grip portion  33  on the side of the second portion  20   b  is disposed at a position of 200 mm or more and 250 mm or less away from the first portion  20   a , as measured in a direction parallel to the direction from the first portion  20   a  toward the second portion  20   b  of the ink cartridge  20 . In addition, it is further preferably disposed at a position of 230 mm or more and 240 mm or less away from the first portion  20   a . In the case that the grip portion  33  is formed to the same position as the second portion  20   b , it is the length from the first portion  20   a  on the second portion  20   b  side of the gripping portion  33  to the position where it is provided as measured in the direction from the first portion  20   a  toward the second portion  20   b . Here, in Parts (a)-(c) of  FIG.  28   , the direction from the first portion  20   a  toward the second portion  20   b  of the ink cartridge  20  is the same as the longitudinal direction of the ink cartridge  20 . 
     Here, in the examples so far, by rotating the ink cartridge  20 , the pad electrodes  27  move in the direction different from the inserting direction of the ink cartridge  20 , but the present invention is not limited to such an example. For example, even if the ink cartridge  20  is not rotated, the pad electrodes  27  moves in a direction different from the inserting direction of the ink cartridge  20 , so that the pad electrode  27  and the electric connecting portion can be satisfactorily connected with each other. 
     Embodiment 9 
     In the first to Embodiment 8s, an ink cartridge that stores ink is used as the member that can be mounted (mountable) on the mounting portion. In Embodiment 9, a member that does not store ink is used as the member that can be mounted (mountable) to the mounting portion. Here, the description having been made about ink cartridges so far can be applied to the members which do not store the ink in the same way except for the description peculiar to ink cartridge. 
       FIG.  29    shows a member  34  as an example of the member not containing ink. The member  34  shown in  FIG.  29    corresponds to the portion including the small diameter portion of the ink cartridge  20  shown in Parts (a)-(d) of  FIG.  6   . In addition, it corresponds to the portion including the cover member  78  shown in Parts (a) and (b) of  FIG.  7   . The member  34  shown in  FIG.  29    does not contain ink therein. 
     The basic structure of the member  34  is the same as the structure described with reference to Embodiment 1, especially Parts (a)-(d) of  FIG.  6   . The member  34  has at least a first portion  34   a , a second portion  34   b , and a third portion  34   c  as a portion facing outwardly of the member  34 . The part on the side where the insertion portion  24  is provided is the first portion  34   a . The part opposite to the first portion  34   a  is the second portion  34   b . And, the first portion  34   a  and the second portion  34   b  are connected by the third portion  34   c . The first portion  34   a  and the second portion  34   b  are the ends of the member  34  and may be referred to as a first end portion and a second end portion, respectively. The third portion  34   c  is between the first portion  34   a  and the second portion  34   b , and in  FIG.  29   , the third portion  34   c  is perpendicular to the first portion  34   a  and the second portion  34   b  (extending in orthogonal directions). Each of the first portion  34   a , the second portion  34   b , and the third portion  34   c  may be surfaces, respectively. Or, the first portion  34   a , the second portion  34   b , and the third portion  34   c  may not be surfaces. For example, when the member  34  has a triangular pyramid shape, the first portion  34   a  may be the bottom surface of the triangular pyramid and the third portion  34   c  may be the apex above the bottom surface of the triangular pyramid. Here, the portion facing outwardly of the member  34  means the portion facing away from the center of the member  34 . 
     The first portion  34   a  is a portion in front of the member  34 , and in  FIG.  29   , it is a surface. The first portion  34   a  is provided with an insertion portion  24  into which the ink receiving tube  21  shown in  FIG.  3    or the like is inserted. The insertion portion  24  may be provided with a seal member having an opening. When the seal member is provided, the ink receiving tube is inserted into the opening of the seal member of the insertion portion  24 . 
     The member  34  has a large diameter portion having a relatively large diameter and a small diameter portion having a diameter relatively smaller than that of the large diameter portion. The part of the small diameter portion on the side where the insertion portion  24  is provided is the first portion  34   a . The second portion  34   b  is provided in the large diameter portion. The third portion  34   c  connecting the first portion  34   a  and the second portion  34   b  is a surface extending between the large diameter portion and the small diameter portion and including a step between the large diameter portion and the small diameter portion. 
     The third portion  34   c  is provided with a projection  25  and an ID projection  28 . In  FIG.  29   , the projecting portion  25  projects from a portion of the small diameter portion of the third portion  34   c . On the other hand, the ID projecting portion  28  projects from a portion of the large diameter portion of the third portion  34   c.    
     The projecting portion  25  has a roof surface  25   a  serving as the roof of the projecting portion and a projecting portion side surface  25   b . The projecting portion side surface  25   b  has four surfaces, which are connected by the roof surface  25   a  at the upper side. Above the roof surface  25   a , the electrode portions  26  in the form of a chip is provided. The electrode portion  26  is provided with a plurality of pad electrodes  27  which are to be in contact with the electrical connection portion of the recording apparatus (mounting portion) so as to be electrically connected to the electrical connecting portion. 
     The roof surface  25   a  is a portion facing the outside of the member  34  and is a part of a portion connecting the first portion  34   a  and the second portion  34   b  and therefore is a part of the third portion  34   c . That is, it can be said that the electrode portion  26  and the plurality of pad electrodes  27  are provided on the third portion  34   c.    
     The electrode portion  26  may be constituted only by the pad electrodes  27 . In this case, the pad electrodes  27  are disposed directly on the roof surface  25   a  of the projecting portion  25 . Here, in  FIG.  29   , the positions of the centers of gravity of the electrodes of the plurality of pad electrodes  27  are arranged on the roof surface  25   a  of the projecting portion  25  in a direction perpendicular to the direction from the first portion  34   a  toward the second portion  34   b  of the member  34 . Each pad electrode  27  has a rectangular shape. 
     Parts (a)-(c) of  FIG.  30    show how the member  34  is mounted on the mounting portion. Basically, it is the same as described in conjunction with Parts (a)-(e) of  FIG.  8    and Parts (a)-(d) of  FIG.  9   . The ink receiving tube is inserted into the insertion portion  24 , but no ink is stored inside the member  34 , and therefore, merely by mounting the member  34  to the mounting portion, the ink is not supplied to the ink receiving tube. The insertion portion  24  may be a part into which the ink receiving tube is inserted. In the case that it is difficult to mount the member  34  in the hole of the hole forming member due to the space problem, when mounting the member  34  on the mounting portion, the member  34  can be gripped by a gripping member (not shown) and the member  34  can be rotated by using the gripping member outside the hole of the hole forming member, for example. 
     Also in mounting the member  34 , the member  34  is inserted along the inserting direction with the first portion  34   a  at the driving side until reaching part (a) of  FIG.  30   . And, as shown in part (b) of  FIG.  30   , part (c) of  FIG.  30   , the member  34  is rotated. In part (c) of  FIG.  30   , the pad electrode  27  of the member  34  comes into contact with the electrical connecting portion of the mounting portion, and the mounting of the member  34  is completed. In the mounting as shown in Parts (a)-(c) of  FIG.  30   , the moving direction of the pad electrode  27  is different from the inserting direction of the member  34 . 
     Embodiment 10 
     In the member  34  described in Embodiment 9, the electrical connecting portion  22  of the mounting portion contacts the center of gravity of each pad electrode  27  of the plurality of pad electrodes  27 , and the pad electrode  27  is electrically connected to the electrical connecting portion  22 , as explained in the case of the ink cartridge. In this example, considering the point where the electrical connecting portion  22  and the pad electrode  27  are in contact, that is, the electrical contact points of the pad electrodes  27  are arranged in a direction parallel to the moving direction of the pad electrode  27 . 
     In contrast, in Embodiment 10, the electrical contact points of the pad electrodes  27  are arranged in a direction crossing the moving direction of the pad electrode  27 . That is, the direction in which the electrical contact points of the pad electrode  27  are arranged is a direction not parallel to the moving direction of the pad electrodes  27 . Here, the crossing direction includes the directions perpendicular to each other. 
     Parts (a) to (c) of  FIG.  31    show the process of mounting such a member  34  to the mounting portion. Basically, it is the same as described in conjunction with Parts (a)-(d) of  FIG.  11    and Parts (a)-(d) of  FIG.  12   , and the member  34  shown in part (a) of  FIG.  31    is screw-rotated to provided the state shown in part (c) of  FIG.  31   . An example of arrangement of a plurality of pad electrodes  27  is also as shown in Parts (a)-(h) of  FIG.  13   . 
     In Embodiment 10, the electrical contact points of the plurality of pad electrodes  27  are arranged in a direction crossing the moving direction of the pad electrodes  27 . The electrical contact points of the pad electrodes  27  are preferably arranged at an angle of 60 degrees or more with respect to the direction of movement of the pad electrode  27 , further preferably it is inclined by 70 degrees or more, even further preferably is inclined by 80 degrees. Moreover, it is preferred that the electrical contact points of the pad electrodes  27  are arranged in a direction perpendicular to the moving direction of the pad electrode  27  (in the vertical direction, the angle formed by the two directions is 90 degrees). The angle at which two directions cross is a small angle among the four corners formed by the two directions. Therefore, the angle at which two directions cross is at most 90 degrees (at this time, the two directions are orthogonal). The moving direction of the pad electrode in Embodiment 10 is a direction in which an approximate straight line (approximate straight line) extends in the same manner as described in Embodiment 3. 
     It can also be considered that the electrical contact points of the pad electrodes  27  are replaced with the areas of the pad electrodes  27 . The direction in which the electrical contact points are arranged may be considered not in relation with the moving direction of the pad electrode  27 , but in relation with the direction from the first portion  34   a  toward the second portion  34   b  of the member  34  or the inserting direction of the member  34  into the hole forming member. Also with these structures, it is possible to accomplish satisfactory contact between the pad electrodes  27  and the electrical connecting portion  22 . 
     In addition, it is preferred that the plurality of pad electrodes  27  have the areas arranged in a direction crossing with the moving direction of the pad electrodes  27 , that is, the areas are arranged so as to be crossed by a line U (part (h) of  FIG.  13   ) inclined with respect to the direction of the arrangement of the pad electrodes  27 , as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 . The plurality of pad electrodes  27  preferably have the areas are arranged in a direction inclined with respect to the moving direction of the pad electrode  27  by 60 degrees or more, further preferably 70 degrees or more, and even further preferably by 80 degrees, that is, the areas are arranged so as to be crossed by a line inclined by an angle of 60 degrees or more, further preferably have by 70 degrees or more, even further preferably 80 degrees or more with respect to the moving direction of the pad electrode  27 . The plurality of pad electrodes  27  preferably have the areas in the direction perpendicular to the moving direction of the pad electrodes  27  (in a vertical direction, the angle formed by the two directions is 90 degrees), that is, the areas are arranged so as to be crossed by a line perpendicular to the moving direction of the pad electrodes  27 . Here, when the moving direction of the pad electrode is curved or screw shape, it can be considered as the direction in which the moving direction of the pad electrode extends the approximate straight line as described above. 
     In addition, it is preferred that the plurality of pad electrodes  27  have the areas arranged in the direction crossing the direction from the first portion  34   a  toward the second portion  34   b  of the member  34 , that is, the area are arranged so as to be crossed by a line U (similarly to part (h) of  FIG.  13   ) inclined with respect to the direction from the first portion  34   a  toward the second portion  34   b  of the ink cartridge  34 , as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 . In addition, it is preferred that the plurality of pad electrodes  27  have the areas arranged in the direction inclined with respect to the direction from the first portion  34   a  toward the second portion  34   b  of the member  34  by 10 degrees or more and 60 degrees or less, that this, the areas are arranged so as to be crossed by a line U (similarly to part (h) of  FIG.  13   ) inclined by an angle (γ) which is 10 degrees or more (β) and 60 degrees or less (α), with respect to the direction (W) from the first portion  34   a  toward the second portion  34   b  of the member  34 , as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 . As to the case in which the angle formed between the line (U) and the direction (W) from the first portion  34   a  toward the second portion  34   b  of the member  34  is the largest as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 , as indicated by line T (in part (h) of  FIG.  13   ) is the largest, the angle (α) formed between the direction (W) and the line T is preferably 40 degrees or more and 60 degrees or less. On the other hand, as to the case in which the angle formed between the line (U) and the direction (W) from the first portion  34   a  toward the second portion  34   b  of the member  34  is the largest as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 , as indicated by line T (in part (h) of  FIG.  13   ) is the smallest, the angle (α) formed between the direction (W) and the line T is preferably 10 degrees or more and 20 degrees or less. The direction from the first portion  34   a  to the second portion  34   b  of the member  34  can also be considered as the longitudinal direction of the member  34 . 
     In addition, it is preferred that the direction in which the areas of the pad electrodes  27  of the plurality of pad electrodes  27  are arranged crosses the inserting direction of the member  34 . In addition, it is preferred that the plurality of pad electrodes  27  have the areas arranged in a direction inclined relative to the inserting direction of the member  34  by an angle of 10 degrees or more and 60 degrees or less, that is, the areas are arranged so as to be crossed by a line U (similarly to part (h) of  FIG.  13   ) inclined by an angle (γ) which is 10 degrees or more (β) and 60 degrees or less (α), with respect to the inserting direction of the member  34 , as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 . As to the case in which the angle formed between the line (U) and the inserting direction of the member  34  is the largest as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 , as indicated by line T (in part (h) of  FIG.  13   ) is the largest, the angle (α) formed between the inserting direction and the line T is preferably 40 degrees or more and 60 degrees or less. On the other hand, as to the case in which the angle formed between the line (U) and the inserting direction of the member  34  is the largest as viewed in the direction perpendicular to the surfaces of the pad electrodes  27 , as indicated by line T in part (h) of  FIG.  13    is the smallest, the angle (α) formed between the inserting direction and the line T is preferably 10 degrees or more and 20 degrees or less. 
     In addition, it is preferred that the direction in which the electrical contact points of the pad electrodes  27  are arranged crosses the longitudinal direction of the member  34 . It is preferred that the direction in which the electrical contact points of the pad electrodes  27  are arranged is inclined by 20 degrees or more and 40 degrees or less with respect to the longitudinal direction of the member  34 . Further, it is further preferable that it is inclined by 30 degrees or more and 35 degrees or less. 
     In addition, it is preferred that the direction in which the electrical contact points of the pad electrodes  27  are arranged process the direction from the first portion  34   a  to the second portion  34   b  of the member  34 . It is preferred that the direction in which the electrical contact points of the respective pad electrodes  27  are arranged is inclined by 20 degrees or more and 40 degrees or less with respect to the direction from the first portion  34   a  toward the second portion  34   b  of the member  34 . Further, it is further preferable that it is inclined by 30 degrees or more and 35 degrees or less. Here, the direction from the first portion  34   a  to the second portion  34   b  is the same as the longitudinal direction and the inserting direction of the member  34  in Embodiment 10. 
     In addition, it is preferred that the direction in which the electrical contact points of the pad electrodes  27  are arranged process the inserting direction of the member  34 . It is preferred that the direction in which the electrical contact points of pad electrode  27  are arranged is inclined by 20 degrees or more and 40 degrees or less with respect to the inserting direction of the member  34 . Further, it is further preferable that it is inclined by 30 degrees or more and 35 degrees or less. 
     Here, it is preferred that similarly to the ink cartridge in Embodiment 5, the member  34  shown in Embodiment 10 also is provided with a gap (space) below the pad electrode. 
     Embodiment 11 
     In Embodiment 9 and Embodiment 10, the member  34  mounted to the mounting portion can be used for various purposes, but it is also possible to use the member as a part of the ink cartridge or with the ink cartridge. 
       FIG.  32    shows an example in which the member  34  is used as a part of the ink cartridge. In  FIG.  32   , an ink cartridge member  35  including an ink storing portion in which ink is stored is mounted to the member  34 . With this structure, the member  34  described in Embodiment 9 and Embodiment 10 is first mounted to the mounting portion of the recording apparatus. And, after mounting the member  34 , the ink cartridge member  35  is mounted to the member  34 . The ink cartridge member  35  contains ink to be supplied to the recording head inside, and has a supply opening  35   a  for supplying the stored ink to the recording apparatus. When the ink cartridge member  35  is mounted to the member  34 , the supply opening  35   a  of the ink cartridge member  35  is disposed at the position of the insertion portion  24  (opening) of the member  34 . And, the ink receiving tube of the recording device is inserted into the insertion portion  24  of the member  34  and the supply opening  35   a  of the ink cartridge member  35 . By this, the ink stored in the ink cartridge member  35  can be supplied to the recording head through the ink receiving tube. 
     Parts (a)-(d) of  FIG.  33    schematically shows a structure in which the ink cartridge member  35  is further mounted after the member  34  is mounted on the mounting portion. In part (a) of  FIG.  33   , the member  34  is shown in a state of being seen from the outside, and in the parts (b) to (d) of  FIG.  33   , the inside of the member  34  is shown. For the first place, the member  34  is mounted to the mounting portion as shown in part (a) of  FIG.  33    and part (b) of  FIG.  33   . This mounting is as explained in the foregoing. Subsequently, as shown in part (c) of  FIG.  33    and part (d) of  FIG.  33   , the ink cartridge member  35  is mounted to the member  34  and the mounting portion. As shown in part (d) of  FIG.  33   , the supply opening  35   a  of the ink cartridge member  35  is disposed at the position of the insertion portion  24  of the member  34 . 
     An example in which a portion corresponding to a portion including a small diameter portion of the ink cartridge is used as the member  34  has been described. The member  34  may have a shape as shown in Parts (a)-(c) of  FIG.  34   . First, similarly to the cylindrical member  34  as shown in part (a) of  FIG.  34   , a cylindrical ink cartridge member  35  is prepared. A plurality of pad electrodes are provided on the member  34 . And, after mounting the member  34  to the mounting portion, as shown in part (b) of  FIG.  34    and part (c) of  FIG.  34   , the ink cartridge member  35  is mounted from behind. 
     Embodiment 12 
     In Embodiment 11, the structure in which the ink cartridge member  35  is directly connected to the member  34 . In Embodiment 12, a tube connectable to the ink receiving tube is mounted (connected) to the member  34 , and the end portion of the connected tube opposite to the ink receiving tube side is connected to the supply opening of the ink containing bottle  36 . 
     An example of the structure of Embodiment 12 is shown in  FIG.  35   . In  FIG.  35   , the ink containing portion of the ink containing bottle  36  is in fluid communication with the ink receiving tube  21  by way of the tube  37 . The tube  37  is connected to the ink receiving tube  21  by way of the insertion portion  24 , and supplies the ink accommodated in the ink accommodating bottle  36  to the ink receiving tube  21 . 
     In the case of the structure as shown in  FIG.  35   , the latitude in designing the ink containing bottle  36  is large, and the ink containing portion of the ink containing bottle  36  can be easily enlarged. Therefore, the capacity of the ink storage bottle  36  can be increased, and ink can be supplied from this large capacity ink storage bottle  36 . 
     The mounting of the member  34  to the mounting portion and the like are the same as those described above. 
     Embodiment 13 
     As a structure of the electrode portion  26  of the member  34 , a pattern as shown in Parts (a)-(d) of  FIG.  36    can be considered. Parts (a)-(d) of  FIG.  36    is an enlarged view of only the periphery of the electrode portion  26  of the member  34 . In part (a) of  FIG.  36   , the electrode portion  26  and the pad electrode  27  are provided on the projecting portion  25 , and this is the structure as explained above. In part (b) of  FIG.  36   , unlike part (a) of  FIG.  36   , the upper surface of the projecting portion  25  is an inclined surface, and the electrode portion  26  and the pad electrode  27  are provided on this inclined surface. 
     In the part (c) of  FIG.  36   , the member  34  does not have the projecting portion in which the electrode portion  26  and the pad electrodes  27  are arranged, and the electrode portion  26  and the pad electrode  27  are directly provided on the side surface of the member  34 . Part (d) of  FIG.  36    is an example in which the arrangement of the pad electrode  27  is different from the part (c) of  FIG.  36   . 
     Here, the structure example of the electrode portion  26  and the pad electrode  27  of the member  34  shown here can be similarly applied to the ink cartridge. 
     Embodiment 14 
     As an example different from the example shown in Embodiment 13 regarding the structure of the electrode portion  26  of the member  34  and the pad electrodes  27 , there is a structure shown in Parts (a)-(d) of  FIG.  37   . 
     Parts (a) to (d) of  FIG.  37    are illustrations of the periphery of the electrode portion  26  of the member  34  as viewed in four directions. In Parts (a)-(d) of  FIG.  37   , the pad electrode  27  projects from the electrode portion  26  on the projecting portion  25 . In this case, the projecting portion  25  may not be provided, and the pad electrode  27  may project from the surface of the member  34 . 
     Here, the structure example of the electrode portion  26  and the pad electrode  27  of the member  34  shown here can also be applied to the ink cartridge in the same manner. 
     PREFERRED STRUCTURE EXAMPLE OF THE PRESENT INVENTION 
     Finally, preferred structure examples disclosed in the present application can be summarized as follows. Here, the contents described in each structure example can be appropriately combined within a range without contradiction. 
     Structure Example A 
     Structure Example A-1 
     A member mountable to a mounting portion provided with an ink receiving tube and a plurality of electrical connecting portions, said member comprising: 
     a first portion including an outwardly facing surface and provided with an inserting portion into which the ink receiving tube is capable of being inserted; 
     a second portion opposite from said first portion; 
     a third portion connecting said first portion and said second portion with each other and provided with a plurality of pad electrodes electrically connectable with said electrical connecting portions, 
     wherein said member is mountable to the mounting portion by being inserted into said mounting portion in an inserting direction with said first portion at a leading side, and 
     wherein said pad electrodes are electrically connectable with said electrical connecting portions by being moved in a direction different from the inserting direction. 
     Structure Example A-2 
     A member according to Structure Example A-1, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and a direction in which electrical contact points are arranged crosses with a moving direction of said pad electrodes. 
     Structure Example A-3 
     A member according to Structure Example A-2, wherein a direction in which said electrical contact points are arranged is inclined by not less than 60° relative to a moving direction of said pad electrodes. 
     Structure Example A-4 
     A member according to Structure Example A-2, wherein a direction in which said electrical contact points are arranged is inclined by not less than 70° relative to a moving direction of said pad electrodes. 
     Structure Example A-5 
     A member according to Structure Example A-2, wherein a direction in which said electrical contact points are arranged is inclined by not less than 80° relative to a moving direction of said pad electrodes. 
     Structure Example A-6 
     A member according to Structure Example A-2, wherein a direction in which said electrical contact points are arranged crosses with a direction perpendicular to a moving direction of said pad electrodes. 
     Structure Example A-7 
     A member according to any one of Structure Examples A-1-A-6, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and said electrical contact points are disposed at positions away from said first portion by not less than 5 mm and not more than 25 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example A-8 
     A member according to any one of Structure Examples A-1-A-6, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and said electrical contact points are disposed at positions away from said first portion by not less than 10 mm and not more than 20 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example A-9 
     A member according to any one of Structure Examples A-1-A-8, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein one of electrical contact points that is closest to said first portion is disposed at a position away from said first portion by not less than 5 mm and not more than 15 mm as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example A-10 
     A member according to any one of Structure Examples A-1-A-8, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein one of electrical contact points that is closest to said first portion is disposed at a position away from said first portion by not less than 10 mm and not more than 11 mm as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example A-11 
     A member according to any one of Structure Examples A-1-A-10, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein one of said electrical contact points that is most remote from said first portion is disposed at a position away from said first portion by not less than 15 mm and not more than 25 mm as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example A-12 
     A member according to any one of Structure Examples A-1-A-10, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein one of said electrical contact points that is most remote from said first portion is disposed at a position away from said first portion by not less than 17 mm and not more than 18 mm as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example A-13 
     A member according to any one of Structure Examples A-1-A-12, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein a direction in which said electrical contact points are arranged crosses with a direction from said first portion toward said second portion. 
     Structure Example A-14 
     A member according to Structure Example A-13, wherein a direction in which said electrical contact points are arranged is inclined by not less than 20° and not more than 40° relative to a directional from said first portion toward said second portion. 
     Structure Example A-15 
     A member according to Structure Example A-13, wherein a direction in which said electrical contact points are arranged is inclined by not less than 30° and not more than 35° relative to a directional from said first portion toward said second portion. 
     Structure Example A-16 
     A member according to any one of Structure Example A-1-A-15, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein a direction in which said electrical contact points are arranged crosses with a longitudinal direction of said member. 
     Structure Example A-17 
     A member according to Structure Example A-16, wherein a direction in which said electrical contact points are arranged is inclined relative to a longitudinal direction of said member by not less than 20° and not more than 40°. 
     Structure Example A-18 
     A member according to Structure Example A-16, wherein a direction in which said electrical contact points are arranged is inclined relative to a longitudinal direction of said member by not less than 30° and not more than 35°. 
     Structure Example A-19 
     A member according to any one of Structure Examples A-1-A-18, wherein a direction in which said electrical contact points are arranged crosses with the inserting direction. 
     Structure Example A-20 
     A member according to Structure Example A-19, wherein a direction in which said electrical contact points are arranged is inclined relative to the crosses inserting direction by not less than 20° and not more than 40°. 
     Structure Example A-21 
     A member according to Structure Example A-19, wherein a direction in which said electrical contact points are arranged is inclined relative to the crosses inserting direction by not less than 30° and not more than 35°. 
     Structure Example A-22 
     A member according to any one of Structure Examples A-1-A-21, wherein the electrical connecting portions are provided in a recording device. 
     Structure Example A-23 
     A member according to any one of Structure Examples A-1-A-22, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and all of said electrical contact points are gravity centers of the respective pad electrodes, respectively. 
     Structure Example A-24 
     A member according to any one of Structure Examples A-1-A-22, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and in a part of said pad electrodes, said electrical contact points are gravity centers of the pad electrodes, and in the other part of said pad electrodes, said electrical contact points are not gravity centers of said pad electrodes. 
     Structure Example A-25 
     A member according to any one of Structure Examples A-1-A-24, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein each of said pad electrodes has a length from the electrical contact point is not less than 0.5 mm and not more than 4.0 mm. 
     Structure Example A-26 
     A member according to any one of Structure Examples A-1-A-25, wherein said third portion is provided with a guide portion configured to rotate said member. 
     Structure Example A-27 
     A member according to Structure Example A-26, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portion, and wherein said electrical contact points are arranged in a direction crossing with the direction in which said guide portion extends. 
     Structure Example A-28 
     A member according to Structure Example A-27, wherein the direction in which said electrical contact points are arranged is inclined relative to the direction in which said guide portion extends by not less than 60°. 
     Structure Example A-29 
     A member according to Structure Example A-27, wherein the direction in which said electrical contact points are arranged is inclined relative to the direction in which said guide portion extends by not less than 70°. 
     Structure Example A-30 
     A member according to Structure Example A-27, wherein the direction in which said electrical contact points are arranged is inclined relative to the direction in which said guide portion extends by not less than 75°. 
     Structure Example A-31 
     A member according to any one of Structure Examples A-26-A-30, wherein the direction in which said electrical contact points are arranged is inclined relative to the direction in which said guide portion extends by not more than 85°. 
     Structure Example A-32 
     A member according to any one of Structure Examples A-26-A-31, wherein said guide portion includes a groove. 
     Structure Example A-33 
     A member according to Structure Example A-32, wherein said groove has a screw-shape. 
     Structure Example A-34 
     A member according to Structure Example A-32 or A-33, wherein said guide portion has a depth of not less than 1.0 mm and not more than 5.0 mm. 
     Structure Example A-35 
     A member according to Structure Example A-32 or A-33, wherein said guide portion has a depth of not less than 2.0 mm and not more than 4.0 mm. 
     Structure Example A-36 
     A member according to any one of Structure Example A-32-A-35, further comprising a rib provided inside said guide portion. 
     Structure Example A-37 
     A member according to Structure Example A-36, wherein said rib has a height of not less than 1.5 mm and not more than 2.0 mm. 
     Structure Example A-38 
     A member according to Structure Example A-36 or A-37, wherein said rib has a height smaller than a depth of said guide portion. 
     Structure Example A-39 
     A member according to any one of Structure Examples A-32-A-38, wherein the mounting portion is provided with a locking pin which is capable of entering said guide portion to guide said member so as to rotate said member, wherein the mounting portion is provided with a locking pin which is capable of inserting into said guide portion to guide said member so as to rotate said member. 
     Structure Example A-40 
     A member according to any one of Structure Examples A-26-A-39, wherein said guide portion extends in a direction crossing with a direction from said first portion to said second portion. 
     Structure Example A-41 
     A member according to Structure Example A-40, wherein a direction in which said guide portion extends is inclined by not less than 50° and not more than 80° relative to a direction from said first portion to said second portion. 
     Structure Example A-42 
     A member according to Structure Example A-40, wherein a direction in which said guide portion extends is inclined by not less than 60° and not more than 70° relative to a direction from said first portion to said second portion. 
     Structure Example A-43 
     A member according to any one of Structure Examples A-26-A-42, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said pad electrodes are provided on the portion having the relatively small diameter. 
     Structure Example A-44 
     A member according to any one of Structure Examples A-26-A-43, further comprising a second guide portion at a position opposed to said first mentioned guide portion. 
     Structure Example A-45 
     A member according to any one of Structure Examples A-26-A-44, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined with respect to a direction in which said guide portion extends. 
     Structure Example A-46 
     A member according to Structure Example A-45, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 60° relative to a direction in which said guide portion extends. 
     Structure Example A-47 
     A member according to Structure Example A-45, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 70° relative to a direction in which said guide portion extends. 
     Structure Example A-48 
     A member according to Structure Example A-45, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 75° relative to a direction in which said guide portion extends. 
     Structure Example A-49 
     A member according to any one of Structure Examples A-45-A-48, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not more than 85° with respect to a direction in which said guide portion extends. 
     Structure Example A-50 
     A member according to any one of Structure Examples A-1-A-49, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said pad electrodes are provided on the portion having the relatively small diameter. 
     Structure Example A-51 
     A member according to Structure Example A-50, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said pad electrodes are provided on and are bridged between the portion having the relatively small diameter and on the portion having the relatively large diameter. 
     Structure Example A-52 
     A member according to Structure Example A-50 or A-51, wherein the relatively large diameter is not less than 50 mm and not more than 80 mm. 
     Structure Example A-53 
     A member according to any one of Structure Examples A-50-A-52, wherein the relatively small diameter is not less than 20 mm and not more than 30 mm. 
     Structure Example A-54 
     A member according to any one of Structure Examples A-50-A-53, wherein a length of the relatively large diameter portion as measured in the direction parallel to the direction from the first portion toward the second portion is not less than 190 mm and not more than 220 mm. 
     Structure Example A-55 
     A member according to any one of Structure Examples A-50-A-54, wherein a length of the relatively small diameter portion as measured in the direction parallel to the direction from the first portion toward the second portion is not less than 20 mm and not more than 30 mm. 
     Structure Example A-56 
     A member according to any one of Structure Example A-1-A-55, wherein said third portion provided with a projected portion. 
     Structure Example A-57 
     A member according to Structure Example A-56, wherein said pad electrodes are provided on said projected portion. 
     Structure Example A-58 
     A member according to any one of Structure Examples A-56 or A-57, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said projected portion is provided on the portion having the relatively small diameter. 
     Structure Example A-59 
     A member according to any one of Structure Examples A-56-A-58, wherein said projected portion has a top side and which said pad electrodes are provided, and said side has a maximum side length of not less than 9 mm and not more than 16 mm, as seen in a direction facing the top side. 
     Structure Example A-60 
     A member according to any one of Structure Examples A-56-A-59, wherein said projected portion has a height of not less than 3 mm and not more than 10 mm. 
     Structure Example A-61 
     A member according to any one of Structure Examples A-56-A-59, wherein said projected portion has a height of not less than 3 mm and not more than 8 mm. 
     Structure Example A-62 
     A member according to any one of Structure Examples A-56-A-61, wherein a first portion side of said projected portion is disposed at a position away from said first portion by not less than 5 mm and not more than 10 mm, as measured in a direction parallel with a direction from said first portion toward said second portion. 
     Structure Example A-63 
     A member according to any one of Structure Examples A-56-A-61, wherein a first portion side of said projected portion is disposed at a position away from said first portion by not less than 6 mm and not more than 7 mm, as measured in a direction parallel with a direction from said first portion toward said second portion. 
     Structure Example A-64 
     A member according to any one of Structure Examples A-56-A-63, wherein a second portion side of said projected portion is disposed at a position away from said first portion by not less than 20 mm and not more than 25 mm, as measured in the direction from said first portion toward said second portion. 
     Structure Example A-65 
     A member according to any one of Structure Examples A-56-A-63, wherein a second portion side of said projected portion is disposed at a position away from said first portion by not less than 22 mm and not more than 23 mm, as measured in the direction from said first portion toward said second portion. 
     Structure Example A-66 
     A member according to any one of Structure Examples A-56-A-65, wherein the mounting portion has a positioning wall, and wherein by rotating said member while said projected portion is in contact with said positioning wall, said pad electrodes are moved in the direction different from the inserting direction. 
     Structure Example A-67 
     A member according to any one of Structure Examples A-56-A-66, wherein an angle formed between a side surface of said projected portion in the direction from said first portion and said second portion is not less than 50° and not more than 70°. 
     Structure Example A-68 
     A member according to any one of Structure Examples A-56-A-66, wherein an angle formed between a side surface of said projected portion in the direction from said first portion and said second portion is not less than 55° and not more than 60°. 
     Structure Example A-69 
     A member according to any one of Structure Examples A-56-A-68, wherein a part of a side surface of said projected portion is protruded. 
     Structure Example A-70 
     A member according to any one of Structure Examples A-56-A-69, wherein said projected portion is provided with a space below said pad electrodes. 
     Structure Example A-71 
     A member according to Structure Example A-70, wherein said space is opened toward said first portion. 
     Structure Example A-72 
     A member according to any one of Structure Examples A-1-A-69, wherein a space is provided below said pad electrodes. 
     Structure Example A-73 
     A member according to any one of Structure Examples A-70-A-72, wherein a supporting member provided in said mounting portion is capable of entering said space. 
     Structure Example A-74 
     A member according to any one of Structure Examples A-70-A-73, wherein an outer periphery of said space has a maximum side length of not less than 10 mm and not more than 15 mm, as seen in a direction facing said pad electrode. 
     Structure Example A-75 
     An ink cartridge according to any one of Structure Examples A-70-A-74, wherein said space has a height of not less than 1 mm and not more than 5 mm. 
     Structure Example A-76 
     An ink cartridge according to any one of Structure Examples A-70-A-74, wherein said space has a height of not less than 2 mm and not more than 3 mm. 
     Structure Example A-77 
     A member according to any one of Structure Examples A-70-A-76, wherein said space extends only a part of a region below said pad electrode. 
     Structure Example A-78 
     A member according to any one of Structure Examples A-1-A-77, wherein said third portion is provided with a projection for identification of said member. 
     Structure Example A-79 
     A member according to Structure Example A-78, wherein a first portion side of said identification projection is away from said first portion by not less than 40 mm and not more than 50 mm, as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example A-80 
     A member according to Structure Example A-78, wherein a first portion side of said identification projection is away from said first portion by not less than 41 mm and not more than 45 mm, as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example A-81 
     A member according to any one of Structure Examples A-78-A-80 wherein a second portion side of said identification projection is away from said first portion by not less than 50 mm and not more than 60 mm, as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example A-82 
     A member according to any one of Structure Examples A-78-A-80, wherein a second portion side of said identification projection is away from said first portion by not less than 55 mm and not more than 58 mm, as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example A-83 
     A member according to any one of Structure Examples A-78-A-82, wherein said identification projection has a height of not less than 3 mm and not more than 10 mm. 
     Structure Example A-84 
     A member according to any one of Structure Examples A-78-A-82, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said ID projection is provided on the portion having the relatively large diameter. 
     Structure Example A-85 
     A member according to any one of Structure Examples A-1-A-84, wherein the movement in the different direction includes a rotation of said member about a rotational axis which is along the inserting direction. 
     Structure Example A-86 
     A member according to any one of Structure Examples A-1-A-84, wherein by rotation of said member about a center axis of said member, said pad electrodes are moved in the direction different from the inserting direction. 
     Structure Example A-87 
     A member according to any one of Structure Examples A-1-A-84, wherein by rotation of said member about a axis of said ink receiving tube, said pad electrode are moved in the direction different from the inserting direction. 
     Structure Example A-88 
     A member according to any one of Structure Example A-85-A-87, wherein the rotation is a screw rotation. 
     Structure Example A-89 
     A member according to any one of Structure Examples A-85-A-88, wherein during the rotation, said member moves in the inserting direction. 
     Structure Example A-90 
     A member according to any one of Structure Examples A-85-A-89, wherein a angle of the rotation of said member up to insertion of said ink receiving tube into the inserting portion is not less than 10° and not more than 40°. 
     Structure Example A-91 
     A member according to any one of Structure Examples A-85-A-89, wherein a angle of the rotation of said member up to insertion of said ink receiving tube into the inserting portion is not less than 20° and not more than 25°. 
     Structure Example A-92 
     A member according to any one of Structure Examples A-85-A-91, wherein a angle of the rotation of said member after the insertion of said member in the inserting direction until said pad electrodes start to be inserted between two positioning walls of the mounting portion is not less than 40° in not more than 75°, wherein the positioning walls are opposed to each other with the electrical connecting portions interposed therebetween. 
     Structure Example A-93 
     A member according to any one of Structure Examples A-85-A-91, wherein a angle of the rotation of said member after the insertion of said member in the inserting direction until said pad electrodes start to be inserted between two positioning walls of the mounting portion is not less than 55° in not more than 65°, wherein the positioning walls are opposed to each other with the electrical connecting portions interposed therebetween. 
     Structure Example A-94 
     A member according to any one of Structure Examples A-85-A-93, wherein an angle of rotation of said member after the insertion in the inserting direction of said member until said pad electrodes start to be brought into contact with electrical connecting portions is not less than 80° and not more than 90°. 
     Structure Example A-95 
     A member according to any one of Structure Examples A-85-A-93, wherein an angle of rotation of said member after the insertion in the inserting direction of said member until said pad electrodes start to be brought into contact with electrical connecting portions is not less than 80° and not more than 88°. 
     Structure Example A-96 
     A member according to any one of Structure Examples A-1-A-95, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined with respect to a moving direction of said pad electrodes. 
     Structure Example A-97 
     A member according to Structure Example A-96, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 60° relative to moving direction of said pad electrodes. 
     Structure Example A-98 
     A member according to Structure Example A-96, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 70° relative to moving direction of said pad electrodes. 
     Structure Example A-99 
     A member according to Structure Example A-96, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 80° relative to moving direction of said pad electrodes. 
     Structure Example A-100 
     A member according to Structure Example A-96, wherein said pad electrodes have areas which are arranged so as to be crossed by a line perpendicular to the moving direction of said pad electrodes. Perpendicular to a moving direction of said pad electrodes. 
     Structure Example A-101 
     A member according to any one of Structure Examples A-1-A-100, wherein said pad electrodes have the areas which are arranged so as to be crossed by a line inclined relative to a direction inclined relative to a direction from the first portion toward the second portion. 
     Structure Example A-102 
     A member according to Structure Example A-101, wherein said pad electrodes have the areas arranged so as to be crossed by a line inclined by not less than 10° and not more than 60° relative to the direction from the first portion toward the second portion. 
     Structure Example A-103 
     A member according to Structure Example A-101, wherein said pad electrodes have the areas arranged so as to be crossed by a line inclined by not less than 40° and not more than 60° relative to the direction from the first portion toward the second portion. 
     Structure Example A-104 
     A member according to any one of Structure Examples A-1-A-103, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined relative to an inserting direction of said member. 
     Structure Example A-105 
     A member according to Structure Example A-104, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 10° and not more than 60° relative to the inserting direction of said member. 
     Structure Example A-106 
     A member according to Structure Example A-104, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 40° and not more than 60° relative to the inserting direction of said member. 
     Structure Example A-107 
     A member according to any one of Structure Examples A-1-A-106, wherein said pad electrodes have areas which are arranged so as to be crossed by aligned inclined relative to a longitudinal direction of said member. 
     Structure Example A-108 
     A member according to Structure Example A-107, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 10° and not more than 60° relative to the longitudinal direction of said member. 
     Structure Example A-109 
     A member according to Structure Example A-107, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 40° and not more than 60° relative to the longitudinal direction of said member. 
     Structure Example B 
     Structure Example B-1 
     A member comprising: a plurality of pad electrodes; 
     a first portion including an outwardly facing surface and provided with an inserting portion into which the ink receiving tube is capable of being inserted; 
     a second portion opposite from said first portion; 
     a third portion connecting said first portion and said second portion with each other and provided with a plurality of pad electrodes, 
     wherein said third portion is provided with a guide portion extending in a direction crossing with a direction from said first portion to said second portion. 
     Structure Example B-2 
     A member according to any one of Structure Example B-1, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and said electrical contact points are disposed at positions away from said first portion by not less than 5 mm and not more than 25 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example B-3 
     A member according to any one of Structure Example B-1, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and said electrical contact points are disposed at positions away from said first portion by not less than 10 mm and not more than 20 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example B-4 
     A member according to any one of Structure Examples B-1-B-3, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein one of said electrical contact points that is closest to said first portion is disposed at a position away from said first portion by not less than 5 mm and not more than 15 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example B-5 
     A member according to any one of Structure Examples B-1-B-3, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein one of said electrical contact points that is closest to said first portion is disposed at a position away from said first portion by not less than 10 mm and not more than 11 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example B-6 
     A member according to any one of Structure Examples B-1-B-5, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein one of said electrical contact points that is most remote from said first portion is disposed at a position away from said first portion by not less than 15 mm and not more than 25 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example B-7 
     A member according to any one of Structure Examples B-1-B-5, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein one of said electrical contact points that is most remote from said first portion is disposed at a position away from said first portion by not less than 17 mm and not more than 18 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example B-8 
     A member according to any one of Structure Examples B-1-B-7, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein a direction in which said electrical contact points are arranged crosses with a direction from said first portion toward said second portion. 
     Structure Example B-9 
     A member according to Structure Example B-8, wherein a direction in which said electrical contact points are arranged is inclined by not less than 20° and not more than 40° relative to a directional from said first portion toward said second portion. 
     Structure Example B-10 
     A member according to Structure Example B-8, wherein a direction in which said electrical contact points are arranged is inclined by not less than 30° and not more than 35° relative to a directional from said first portion toward said second portion. 
     Structure Example B-11 
     A member according to any one of Structure Examples B-1-B-10, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein a direction in which said electrical contact points are arranged crosses with a longitudinal direction of said member. 
     Structure Example B-12 
     A member according to Structure Example B-11, wherein a direction in which said electrical contact points are arranged is inclined relative to a longitudinal direction of said member by not less than 20° and not more than 40°. 
     Structure Example B-13 
     A member according to Structure Example B-11, wherein a direction in which said electrical contact points are arranged is inclined relative to a longitudinal direction of said member by not less than 30° and not more than 35°. 
     Structure Example B-14 
     A member according to any one of Structure Examples B-1-B-13, wherein a direction in which said electrical contact points are arranged crosses with the inserting direction. 
     Structure Example B-15 
     A member according to Structure Example B-14, wherein a direction in which said electrical contact points are arranged crosses with the inserting direction at a angle of not less than 20° and not more than 40°. 
     Structure Example B-16 
     A member according to Structure Example B-14, wherein a direction in which said electrical contact points are arranged crosses with the inserting direction at a angle of not less than 30° and not more than 35°. 
     Structure Example B-17 
     A member according to any one of Structure Examples B-1-B-16, wherein the electrical connecting portions are provided in a recording device. 
     Structure Example B-18 
     A member according to any one of Structure Examples B-1-B-17, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and all of said electrical contact points are gravity centers of the respective pad electrodes, respectively. 
     Structure Example B-19 
     A member according to any one of Structure Examples B-1-B-18, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and in a part of said pad electrodes, said electrical contact points are gravity centers of the pad electrodes, and in the other part of said pad electrodes, said electrical contact points are not gravity centers of said pad electrodes. 
     Structure Example B-20 
     A member according to any one of Structure Examples B-1-B-19, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein each of said pad electrodes has a length from the electrical contact point is not less than 0.5 mm and not more than 4.0 mm. 
     Structure Example B-21 
     A member according to any one of Structure Examples B-1-B-20, wherein said guide portion is configured to rotate said member. 
     Structure Example B-22 
     A member according to any one of Structure Examples B-1-B-21, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portion, and wherein said electrical contact points are arranged in a direction crossing with the direction in which said guide portion extends. 
     Structure Example B-23 
     A member according Structure Example B-22, wherein the direction in which said electrical contact points are arranged is inclined relative to the direction in which said guide portion extends by not less than 60°. 
     Structure Example B-24 
     A member according Structure Example B-22, wherein the direction in which said electrical contact points are arranged is inclined relative to the direction in which said guide portion extends by not less than 70°. 
     Structure Example B-25 
     A member according Structure Example B-22, wherein the direction in which said electrical contact points are arranged is inclined relative to the direction in which said guide portion extends by not less than 75°. 
     Structure Example B-26 
     A member according to any one of Structure Examples B-22-B-25, wherein the direction in which said electrical contact points are arranged is inclined relative to the direction in which said guide portion extends by not more than 85° 
     Structure Example B-27 
     A member according to any one of Structure Examples B-1-B-26, wherein said guide portion includes a groove. 
     Structure Example B-28 
     A member according to Structure Examples B-27, wherein said groove has a screw-shape. 
     Structure Example B-29 
     A member according to Structure Example B-27 or B-28, wherein said guide portion has a depth of not less than 1.0 mm and not more than 5.0 mm. 
     Structure Example B-30 
     A member according to Structure Example B-27 or B-28, wherein said guide portion has a depth of not less than 2.0 mm and not more than 4.0 mm. 
     Structure Example B-31 
     A member according to any one of Structure Example B-27-B-30, further comprising a rib provided inside said guide portion. 
     Structure Example B-32 
     A member according to Structure Example B-31, wherein said rib has a height of not less than 1.5 mm and not more than 2.0 mm. 
     Structure Example B-33 
     A member according to Structure Example B-31 or B-32, wherein said rib has a height smaller than a depth of said guide portion. 
     Structure Example B-34 
     A member according to any one of Structure Examples B-31-B-33, wherein a gravity center of said rib is disposed at the position away from said first portion by not less than 40 mm and not more than 50 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example B-35 
     A member according to any one of Structure Examples B-1-B34, wherein said guide portion extends in a direction crossing with a direction from said first portion to said second portion. 
     Structure Example B-36 
     A member according to Structure Example B-35, wherein a direction in which said guide portion extends is inclined by not less than 50° and not more than 80° relative to a direction from said first portion to said second portion. 
     Structure Example B-37 
     A member according to Structure Example B-35, wherein a direction in which said guide portion extends is inclined by not less than 60° and not more than 70° relative to a direction from said first portion to said second portion. 
     Structure Example B-38 
     A member according to any one of Structure Examples B-1-B-37, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said pad electrodes are provided on the portion having the relatively small diameter. 
     Structure Example B-39 
     A member according to any one of Structure Examples B-1-B-38, further comprising a second guide portion at a position opposed to said first mentioned guide portion. 
     Structure Example B-40 
     A member according to any one of Structure Examples B-1-B-39, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined with respect to a direction in which said guide portion extends. 
     Structure Example B-41 
     A member according to Structure Example B-40, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 60° relative to a direction in which said guide portion extends. 
     Structure Example B-42 
     A member according to Structure Example B-40, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 70° relative to a direction in which said guide portion extends. 
     Structure Example B-43 
     A member according to Structure Example B-40, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 75° relative to a direction in which said guide portion extends. 
     Structure Example B-44 
     A member according to any one of Structure Examples B-40-B-43, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not more than 85° with respect to a direction in which said guide portion extends. 
     Structure Example B-45 
     A member according to any one of Structure Examples B-1-B-44, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said pad electrodes are provided on the portion having the relatively small diameter. 
     Structure Example B-46 
     A member according to Structure Example B-45, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said pad electrodes are provided on and are bridged between the portion having the relatively small diameter and on the portion having the relatively large diameter. 
     Structure Example B-47 
     A member according to Structure Example B-45 or B-46, wherein the relatively large diameter is not less than 50 mm and not more than 80 mm. 
     Structure Example B-48 
     A member according to any one of Structure Examples B-45-B-47, wherein the relatively small diameter is not less than 20 mm and not more than 30 mm. 
     Structure Example B-49 
     A member according to any one of Structure Examples B-45-B-48, wherein a length of the relatively large diameter portion as measured in the direction parallel to the direction from the first portion toward the second portion is not less than 190 mm and not more than 220 mm. 
     Structure Example B-50 
     A member according to any one of Structure Examples B-45-B-48, wherein a length of the relatively small diameter portion as measured in the direction parallel to the direction from the first portion toward the second portion is not less than 20 mm and not more than 30 mm. 
     Structure Example B-51 
     A member according to any one of Structure Example B-1-B-50, wherein said third portion provided with a projected portion. 
     Structure Example B-52 
     A member according to Structure Example B-51, wherein said pad electrodes are provided on said projected portion. 
     Structure Example B-53 
     A member according to any one of Structure Examples B-51 or B-52, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said projected portion is provided on the portion having the relatively small diameter. 
     Structure Example B-54 
     A member according to any one of Structure Examples B-51-B-53, wherein said projected portion has a top side and which said pad electrodes are provided, and said side has a maximum side length of not less than 9 mm and not more than 16 mm, as seen in a direction facing the top side. 
     Structure Example B-55 
     A member according to any one of Structure Examples B-51-B-54, wherein said projected portion has a height of not less than 3 mm and not more than 10 mm. 
     Structure Example B-56 
     A member according to any one of Structure Examples B-51-B-54, wherein said projected portion has a height of not less than 3 mm and not more than 8 mm. 
     Structure Example B-57 
     A member according to any one of Structure Examples B-51-B-56, wherein a first portion side of said projected portion is disposed at a position away from said first portion by not less than 5 mm and not more than 10 mm, as measured in a direction parallel with a direction from said first portion toward said second portion. 
     Structure Example B-58 
     A member according to any one of Structure Examples B-51-B-56, wherein a first portion side of said projected portion is disposed at a position away from said first portion by not less than 6 mm and not more than 7 mm, as measured in a direction parallel with a direction from said first portion toward said second portion. 
     Structure Example B-59 
     A member according to any one of Structure Examples B-51-B-58, wherein a second portion side of said projected portion is disposed at a position away from said first portion by not less than 20 mm and not more than 25 mm, as measured in the direction from said first portion toward said second portion. 
     Structure Example B-60 
     A member according to any one of Structure Examples B-51-B-58, wherein a second portion side of said projected portion is disposed at a position away from said first portion by not less than 22 mm and not more than 23 mm, as measured in the direction from said first portion toward said second portion. 
     Structure Example B-61 
     A member according to any one of Structure Examples B-51-B-60, wherein an angle formed between a side surface of said projected portion in the direction from said first portion and said second portion is not less than 50° and not more than 70°. 
     Structure Example B-62 
     A member according to any one of Structure Examples B-51-B-60, wherein an angle formed between a side surface of said projected portion in the direction from said first portion and said second portion is not less than 55° and not more than 60°. 
     Structure Example B-63 
     A member according to any one of Structure Examples B-51-B-62, wherein a part of a side surface of said projected portion is protruded. 
     Structure Example B-64 
     A member according to Structure Example B51-B-63, wherein said projected portion is provided with a space below said pad electrodes. 
     Structure Example B-65 
     A member according to Structure Example B-64, wherein said space is opened toward said first portion. 
     Structure Example B-66 
     A member according to any one of Structure Examples B-1-B-65, wherein a space is provided below said pad electrodes. 
     Structure Example B-67 
     A member according to any one of Structure Examples B-64-B-66, wherein a supporting member provided in said mounting portion is capable of entering said space. 
     Structure Example B-68 
     A member according to any one of Structure Examples B-64-B-67, wherein an outer periphery of said space has a maximum side length of not less than 10 mm and not more than 15 mm, as seen in a direction facing said pad electrode. 
     Structure Example B-69 
     An ink cartridge according to any one of Structure Examples B-66-B-68, wherein said space has a height of not less than 1 mm and not more than 5 mm. 
     Structure Example B-70 
     An ink cartridge according to any one of Structure Examples B-66-B-69, wherein said space has a height of not less than 2 mm and not more than 3 mm. 
     Structure Example B-71 
     A member according to any one of Structure Examples B-66-B-70, wherein said space extends only a part of a region below said pad electrode. 
     Structure Example B-72 
     A member according to any one of Structure Examples B-1-B-71, wherein said third portion is provided with a projection for identification of said member. 
     Structure Example B-73 
     A member according to Structure Example B-72, wherein a first portion side of said identification projection is away from said first portion by not less than 40 mm and not more than 50 mm, as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example B-74 
     A member according to Structure Example B-72, wherein a first portion side of said identification projection is away from said first portion by not less than 41 mm and not more than 45 mm, as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example B-75 
     A member according to any one of Structure Examples B-72-B-74 wherein a second portion side of said identification projection is away from said first portion by not less than 50 mm and not more than 60 mm, as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example B-76 
     A member according to any one of Structure Examples B-72-B-74 wherein a second portion side of said identification projection is away from said first portion by not less than 55 mm and not more than 58 mm, as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example B-77 
     A member according to any one of Structure Examples B-72-B-76, wherein said identification projection has a height of not less than 3 mm and not more than 10 mm. 
     Structure Example B-78 
     A member according to any one of Structure Examples B-72-B-77, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said ID projection is provided on the portion having the relatively large diameter. 
     Structure Example B-79 
     A member according to any one of Structure Examples B-1-B-78, wherein said pad electrodes have the areas which are arranged so as to be crossed by a line inclined relative to a direction inclined relative to a direction from the first portion toward the second portion. 
     Structure Example B-80 
     A member according to Structure Example B-79, wherein said pad electrodes have the areas arranged so as to be crossed by a line inclined by not less than 10° and not more than 60° relative to the direction from the first portion toward the second portion. 
     Structure Example B-81 
     A member according to Structure Example B-79, wherein said pad electrodes have the areas arranged so as to be crossed by a line inclined by not less than 40° and not more than 60° relative to the direction from the first portion toward the second portion. 
     Structure Example B-82 
     A member according to any one of Structure Examples B-1-B-81, wherein said pad electrodes have areas which are arranged so as to be crossed by aligned inclined relative to a longitudinal direction of said member. 
     Structure Example B-83 
     A member according to Structure Example B-82, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 10° and not more than 60° relative to the longitudinal direction of said member. 
     Structure Example B-84 
     A member according to Structure Example B-82, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 40° and not more than 60° relative to the longitudinal direction of said member. 
     Structure Example C 
     A member mountable to a mounting portion provided with an ink receiving tube and a plurality of electrical connecting portions, said member comprising: 
     a first portion including an outwardly facing surface and provided with an inserting portion into which the ink receiving tube is capable of being inserted; 
     a second portion opposite from said first portion; and 
     a third portion connecting said first portion and said second portion with each other and provided with a plurality of pad electrodes electrically connectable with said electrical connecting portions, 
     wherein said pad electrodes include respective electrical contact points electrically connectable with said electrical connecting portions, and wherein a direction in which said electrical contact points are arranged crosses with a moving direction of said pad electrodes. 
     Structure Example D 
     A member mountable to a mounting portion provided with an ink receiving tube and a plurality of electrical connecting portions, said member comprising: 
     a first portion including an outwardly facing surface and provided with an inserting portion into which the ink receiving tube is capable of being inserted; 
     a second portion opposite from said first portion; and 
     a third portion connecting said first portion and said second portion with each other and provided with a plurality of pad electrodes electrically connectable with said electrical connecting portions, 
     wherein said pad electrodes include respective electrical contact points electrically connectable with said electrical connecting portions, and wherein a direction in which said electrical contact points are arranged crosses with a direction from said first portion to second portion. 
     Structure Example E 
     A member mountable to a mounting portion provided with an ink receiving tube and a plurality of electrical connecting portions, said member comprising: 
     a first portion including an outwardly facing surface and provided with an inserting portion into which the ink receiving tube is capable of being inserted; 
     a second portion opposite from said first portion; and 
     a third portion connecting said first portion and said second portion with each other and provided with a plurality of pad electrodes electrically connectable with said electrical connecting portions, 
     wherein said pad electrodes include respective electrical contact points electrically connectable with said electrical connecting portions, and wherein a direction in which said electrical contact points are arranged crosses with a longitudinal direction of said member. 
     Structure Example F 
     A member mountable to a mounting portion provided with an ink receiving tube and a plurality of electrical connecting portions, said member comprising: 
     a first portion including an outwardly facing surface and provided with an inserting portion into which the ink receiving tube is capable of being inserted; 
     a second portion opposite from said first portion; and 
     a third portion connecting said first portion and said second portion with each other and provided with a plurality of pad electrodes electrically connectable with said electrical connecting portions, 
     wherein said third portion is provided with a screw-like groove. 
     Structure Example G 
     A member mountable to a mounting portion provided with an ink receiving tube and a plurality of electrical connecting portions, said member comprising: 
     a first portion including an outwardly facing surface and provided with an inserting portion into which the ink receiving tube is capable of being inserted; 
     a second portion opposite from said first portion; and 
     a third portion connecting said first portion and said second portion with each other and provided with a plurality of pad electrodes electrically connectable with said electrical connecting portions, 
     wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said pad electrodes are provided on the portion having the relatively small diameter, and a wherein said third portion is provided with a projected portion, wherein pad electrodes are provided on said projected portion. 
     Structure Example H 
     A member mountable to a mounting portion provided with an ink receiving tube and a plurality of electrical connecting portions, said member comprising: 
     a first portion including an outwardly facing surface and provided with an inserting portion into which the ink receiving tube is capable of being inserted; 
     a second portion opposite from said first portion; and 
     a third portion connecting said first portion and said second portion with each other and provided with a plurality of pad electrodes electrically connectable with said electrical connecting portions, 
     wherein a space is provided below said pad electrode. 
     Structure Example I 
     Structure Example I-1 
     A member according to any one of Structure Examples A-1-A-109, B-1-B-84, C, D, E, F, G and H, wherein said member has a cylindrical shape. 
     Structure Example I-2 
     A member according to any one of Structure Examples A-1-A-109, B-1-B-84, C, D, E, F, G and H, wherein said member has a polygonal prism shape. 
     Structure Example I-3 
     A member according to any one of Structure Examples A-1-A-109, B-1-B-84, C, D, E, F, G and H, wherein said member has a conical shape. 
     Structure Example I-4 
     A member according to any one of Structure Examples A-1-A-109, B-1-B-84, C, D, E, F, G and H, wherein said member has a polygonal pyramid shape. 
     Structure Example I-5 
     A member according to any one of Structure Examples A-1-A-109, B-1-B-84, C, D, E, F, G, H and I-1-I-4, wherein said member has a polygonal pyramid shape. 
     Structure Example I-6 
     A member according to any one of Structure Examples A-1-A-109, B-1-B-84, C, D, E, F, G, H and I-1-I-5, further comprising a casing including the first portion and the second portion, wherein a portion on a first portion side is rotatable independently of said casing. 
     Structure Example I-7 
     A member according to any one of Structure Examples A-1-A-109, B-1, B-84, C, D, E, F, G, H, I-1 and 1-6, further comprising a grip portion at a position closer to said second portion than to said first portion. 
     Structure Example I-8 
     A member according to any one of Structure Examples A-1-A-109, B-1, B-84, C, D, E, F, G, H, I-1 and I-7, wherein said member does not contain ink. 
     Structure Example I-9 
     A member according to any one of Structure Examples A-1-A-109, B-1-B-84, C, D, E, F, G, H and I-1-I-8, wherein an ink cartridge member including an ink containing portion containing the ink is mountable to said member. 
     Structure Example I-10 
     A member according to Structure Example I-9, wherein an ink cartridge member including an ink containing portion containing the ink is mountable to said member through a tube. 
     Structure Example J 
     Structure Example J-1 
     An ink cartridge mountable to a mounting portion provided with an ink receiving tube and a plurality of electrical connecting portions, said ink cartridge comprising: 
     a first portion including an outwardly facing surface and provided with an inserting portion into which the ink receiving tube is capable of being inserted; 
     a second portion opposite from said first portion; and 
     a third portion connecting said first portion and said second portion with each other and provided with a plurality of pad electrodes electrically connectable with said electrical connecting portions, 
     wherein said ink cartridge is mountable to the mounting portion by being inserted into said mounting portion in an inserting direction with said first portion at a leading side, and 
     wherein said pad electrodes are electrically connectable with said electrical connecting portions by being moved in a direction different from the inserting direction. 
     Structure Example J-2 
     An ink cartridge according to Structure Example J-1, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and a direction in which electrical contact points are arranged crosses with a moving direction of said pad electrodes. 
     Structure Example J-3 
     An ink cartridge according to Structure Example J-2, wherein a direction in which said electrical contact points are arranged is inclined by not less than 60° relative to a moving direction of said pad electrodes. 
     Structure Example J-4 
     An ink cartridge according to Structure Example J-2, wherein a direction in which said electrical contact points are arranged is inclined by not less than 70° relative to a moving direction of said pad electrodes. 
     Structure Example J-5 
     An ink cartridge according to Structure Example J-2, wherein a direction in which said electrical contact points are arranged is inclined by not less than 80° relative to a moving direction of said pad electrodes. 
     Structure Example J-6 
     An ink cartridge according to Structure Example J-2, wherein a direction in which said electrical contact points are arranged crosses with a direction perpendicular to a moving direction of said pad electrodes. 
     Structure Example J-7 
     An ink cartridge according to any one of Structure Examples J-1-J-6, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and said electrical contact points are disposed at positions away from said first portion by not less than 5 mm and not more than 25 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example J-8 
     An ink cartridge according to any one of Structure Examples J-1-J-6, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and said electrical contact points are disposed at positions away from said first portion by not less than 10 mm and not more than 20 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example J-9 
     An ink cartridge according to any one of Structure Examples J-1-J-8, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein one of electrical contact points that is closest to said first portion is disposed at a position away from said first portion by not less than 5 mm and not more than 15 mm as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example J-10 
     An ink cartridge according to any one of Structure Examples J-1-J-8, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein one of electrical contact points that is closest to said first portion is disposed at a position away from said first portion by not less than 10 mm and not more than 11 mm as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example J-11 
     An ink cartridge according to any one of Structure Examples J-1-J-10, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein one of said electrical contact points that is most remote from said first portion is disposed at a position away from said first portion by not less than 15 mm and not more than 25 mm as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example J-12 
     An ink cartridge according to any one of Structure Examples J-1-J-10, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein one of said electrical contact points that is most remote from said first portion is disposed at a position away from said first portion by not less than 17 mm and not more than 18 mm as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example J-13 
     An ink cartridge according to any one of Structure Examples J-1-J-12, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein a direction in which said electrical contact points are arranged crosses with a direction from said first portion toward said second portion. 
     Structure Example J-14 
     An ink cartridge according to Structure Example J-13, wherein a direction in which said electrical contact points are arranged is inclined by not less than 20° and not more than 40° relative to a directional from said first portion toward said second portion. 
     Structure Example J-15 
     An ink cartridge according to Structure Example J-13, wherein a direction in which said electrical contact points are arranged is inclined by not less than 30° and not more than 35° relative to a directional from said first portion toward said second portion. 
     Structure Example J-16 
     An ink cartridge according to any one of Structure Examples J-1-J-15, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein a direction in which said electrical contact points are arranged crosses with a longitudinal direction of said ink cartridge. 
     Structure Example J-17 
     An ink cartridge according to Structure Example J-16, wherein a direction in which said electrical contact points are arranged is inclined relative to a longitudinal direction of said ink cartridge by not less than 20° and not more than 40°. 
     Structure Example J-18 
     An ink cartridge according to Structure Example J-16, wherein a direction in which said electrical contact points are arranged is inclined relative to a longitudinal direction of said ink cartridge by not less than 30° and not more than 35°. 
     Structure Example J-19 
     An ink cartridge according to any one of Structure Examples J-1-J-18, wherein a direction in which said electrical contact points are arranged crosses with the inserting direction. 
     Structure Example J-20 
     An ink cartridge according to Structure Example J-19, wherein a direction in which said electrical contact points are arranged is inclined relative to the crosses inserting direction by not less than 20° and not more than 40°. 
     Structure Example J-21 
     An ink cartridge according to Structure Example J-19, wherein a direction in which said electrical contact points are arranged is inclined relative to the crosses inserting direction by not less than 30° and not more than 35°. 
     Structure Example J-22 
     An ink cartridge according to any one of Structure Examples J-1-J-21, wherein the electrical connecting portions are provided in a recording device. 
     Structure Example J-23 
     An ink cartridge according to any one of Structure Examples J-1-J-22, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and all of said electrical contact points are gravity centers of the respective pad electrodes, respectively. 
     Structure Example J-24 
     An ink cartridge according to any one of Structure Examples J-1-J-22, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and in a part of said pad electrodes, said electrical contact points are gravity centers of the pad electrodes, and in the other part of said pad electrodes, said electrical contact points are not gravity centers of said pad electrodes. 
     Structure Example J-25 
     An ink cartridge according to any one of Structure Examples J-1-J-24, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein each of said pad electrodes has a length from the electrical contact point is not less than 0.5 mm and not more than 4.0 mm. 
     Structure Example J-26 
     An ink cartridge according to any one of Structure Examples J-1-J-25, wherein said third portion is provided with a guide portion configured to rotate said member. 
     Structure Example J-27 
     An ink cartridge according to Structure Example J-26, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portion, and wherein said electrical contact points are arranged in a direction crossing with the direction in which said guide portion extends. 
     Structure Example J-28 
     An ink cartridge according to Structure Example J-27, wherein the direction in which said electrical contact points are arranged is inclined relative to the direction in which said guide portion extends by not less than 60°. 
     Structure Example J-29 
     An ink cartridge according to Structure Example J-27, wherein the direction in which said electrical contact points are arranged is inclined relative to the direction in which said guide portion extends by not less than 70°. 
     Structure Example J-30 
     An ink cartridge according to Structure Example J-27, wherein the direction in which said electrical contact points are arranged is inclined relative to the direction in which said guide portion extends by not less than 75°. 
     Structure Example J-31 
     An ink cartridge according to any one of Structure Examples J-26-J-30, wherein the direction in which said electrical contact points are arranged is inclined relative to the direction in which said guide portion extends by not more than 85°. 
     Structure Example J-32 
     An ink cartridge according to any one of Structure Examples J-26-J-31, wherein said guide portion includes a groove. 
     Structure Example J-33 
     An ink cartridge according to Structure Example J-32, wherein said groove has a screw-shape. 
     Structure Example J-34 
     An ink cartridge according to Structure Example J-32 or J-33, wherein said guide portion has a depth of not less than 1.0 mm and not more than 5.0 mm. 
     Structure Example J-35 
     An ink cartridge according to Structure Example J-32 or J-33, wherein said guide portion has a depth of not less than 2.0 mm and not more than 4.0 mm. 
     Structure Example J-36 
     An ink cartridge according to any one of Structure Example J-32-J-35, further comprising a rib provided inside said guide portion. 
     Structure Example J-37 
     An ink cartridge according to Structure Example J-36, wherein said rib has a height of not less than 1.5 mm and not more than 2.0 mm. 
     Structure Example J-38 
     An ink cartridge according to Structure Example J-36 or J-37, wherein said rib has a height smaller than a depth of said guide portion. 
     Structure Example J-39 
     An ink cartridge according to any one of Structure Examples J-32-J-38, wherein the mounting portion is provided with a locking pin which is capable of entering said guide portion to guide said member so as to rotate said member. 
     Structure Example J-40 
     An ink cartridge according to any one of Structure Examples J-26-J-39, wherein said guide portion extends in a direction crossing with a direction from said first portion to said second portion. 
     Structure Example J-41 
     An ink cartridge according to Structure Example J-40, wherein a direction in which said guide portion extends is inclined by not less than 50° and not more than 80° relative to a direction from said first portion to said second portion. 
     Structure Example J-42 
     An ink cartridge according to Structure Example J-40, wherein a direction in which said guide portion extends is inclined by not less than 60° and not more than 70° relative to a direction from said first portion to said second portion. 
     Structure Example J-43 
     An ink cartridge according to any one of Structure Example J-26 or J-42, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said guide portion is provided on the portion having the relatively large diameter. 
     Structure Example J-44 
     An ink cartridge according to Structure Example J-26 or J-43, further comprising a second guide portion at a position opposed to said first mentioned guide portion. 
     Structure Example J-45 
     An ink cartridge according to any one of Structure Example J-26 or J-44, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined with respect to a direction in which said guide portion extends. 
     Structure Example J-46 
     An ink cartridge according to Structure Example J-45, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 60° relative to a direction in which said guide portion extends. 
     Structure Example J-47 
     An ink cartridge according to Structure Example J-45, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 70° relative to a direction in which said guide portion extends. 
     Structure Example J-48 
     An ink cartridge according to Structure Example J-45, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 75° relative to a direction in which said guide portion extends. 
     Structure Example J-49 
     An ink cartridge according to any one of Structure Examples J-45-J-48, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not more than 85° with respect to a direction in which said guide portion extends. 
     Structure Example J-50 
     An ink cartridge according to any one of Structure Examples J-1-J-49, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said pad electrodes are provided on the portion having the relatively small diameter. 
     Structure Example J-51 
     An ink cartridge according to Structure Example J-50, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said pad electrodes are provided on and are bridged between the portion having the relatively small diameter and on the portion having the relatively large diameter. 
     Structure Example J-52 
     An ink cartridge according to Structure Example J-50 or J-51, wherein the relatively large diameter is not less than 50 mm and not more than 80 mm. 
     Structure Example J-53 
     An ink cartridge according to any one of Structure Examples J-50-J-52, wherein the relatively small diameter is not less than 20 mm and not more than 30 mm. 
     Structure Example J-54 
     An ink cartridge according to any one of Structure Examples J-50-J-53, wherein a length of the relatively large diameter portion as measured in the direction parallel to the direction from the first portion toward the second portion is not less than 190 mm and not more than 220 mm. 
     Structure Example J-55 
     An ink cartridge according to any one of Structure Examples J-50-J-54, wherein a length of the relatively small diameter portion as measured in the direction parallel to the direction from the first portion toward the second portion is not less than 20 mm and not more than 30 mm. 
     Structure Example J-56 
     An ink cartridge according to any one of Structure Example J-1-J-55, wherein said third portion is provided with a projected portion. 
     Structure Example J-57 
     An ink cartridge according to Structure Example J-56, wherein said pad electrodes are provided on said projected portion. 
     Structure Example J-58 
     An ink cartridge according to any one of Structure Example J-56 or-J-57, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said projected portion is provided on the portion having the relatively small diameter. 
     Structure Example J-59 
     An ink cartridge according to any one of Structure Examples J-56-J-58, wherein said projected portion has a top side and which said pad electrodes are provided, and said side has a maximum side length of not less than 9 mm and not more than 16 mm, as seen in a direction facing the top side. 
     Structure Example J-60 
     An ink cartridge according to any one of Structure Examples J-56-J-59, wherein said projected portion has a height of not less than 3 mm and not more than 10 mm. 
     Structure Example J-61 
     An ink cartridge according to any one of Structure Examples J-56-J-59, wherein said projected portion has a height of not less than 3 mm and not more than 8 mm. 
     Structure Example J-62 
     An ink cartridge according to any one of Structure Examples J-56-J-61, wherein a first portion side of said projected portion is disposed at a position away from said first portion by not less than 5 mm and not more than 10 mm, as measured in a direction parallel with a direction from said first portion toward said second portion. 
     Structure Example J-63 
     An ink cartridge according to any one of Structure Examples J-56-J-61, wherein a first portion side of said projected portion is disposed at a position away from said first portion by not less than 6 mm and not more than 7 mm, as measured in a direction parallel with a direction from said first portion toward said second portion. 
     Structure Example J-64 
     An ink cartridge according to any one of Structure Examples J-56-J-63, wherein a second portion side of said projected portion is disposed at a position away from said first portion by not less than 20 mm and not more than 25 mm, as measured in the direction from said first portion toward said second portion. 
     Structure Example J-65 
     An ink cartridge according to any one of Structure Examples J-56-J-63, wherein a second portion side of said projected portion is disposed at a position away from said first portion by not less than 22 mm and not more than 23 mm, as measured in the direction from said first portion toward said second portion. 
     Structure Example J-66 
     An ink cartridge according to Structure Examples J-56-J-65, wherein the mounting portion has a positioning wall, and wherein by rotating said ink cartridge while said projected portion is in contact with said positioning wall, said pad electrodes are moved in the direction different from the inserting direction. 
     Structure Example J-67 
     An ink cartridge according to any one of Structure Examples J-56-J-66, wherein an angle formed between a side surface of said projected portion in the direction from said first portion and said second portion is not less than 50° and not more than 70°. 
     Structure Example J-68 
     An ink cartridge according to any one of Structure Examples J-56-J-66, wherein an angle formed between a side surface of said projected portion in the direction from said first portion and said second portion is not less than 55° and not more than 60°. 
     Structure Example J-69 
     An ink cartridge according to any one of Structure Examples J-56-J-68, wherein a part of a side surface of said projected portion is protruded. 
     Structure Example J-70 
     An ink cartridge according to any one of Structure Examples J-56-J-69, wherein said projected portion is provided with a space below said pad electrodes. 
     Structure Example J-71 
     An ink cartridge according to Structure Example J-70, wherein said space is opened toward said first portion. 
     Structure Example J-72 
     An ink cartridge according to any one of Structure Examples J-1-J-69, wherein a space is provided below said pad electrodes. 
     Structure Example J-73 
     A member according to any one of Structure Examples J-70-J-72, wherein a supporting member provided in said mounting portion is capable of entering said space. 
     Structure Example J-74 
     An ink cartridge according to any one of Structure Examples J-70-J-73, wherein an outer periphery of said space has a maximum side length of not less than 10 mm and not more than 15 mm, as seen in a direction facing said pad electrode. 
     Structure Example J-75 
     An ink cartridge according to any one of Structure Examples J-70-J-74, wherein said space has a height of not less than 1 mm and not more than 5 mm. 
     Structure Example J-76 
     An ink cartridge according to any one of Structure Examples J-70-J-74, wherein said space has a height of not less than 2 mm and not more than 3 mm. 
     Structure Example J-77 
     An ink cartridge according to any one of Structure Examples J-70-J-76, wherein said space extends only a part of a region below said pad electrode. 
     Structure Example J-78 
     An ink cartridge according to any one of Structure Examples J-1-J-77, wherein said third portion is provided with a projection for identification of said member. 
     Structure Example J-79 
     An ink cartridge according to Structure Example J-78, wherein a first portion side of said identification projection is away from said first portion by not less than 40 mm and not more than 50 mm, as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example J-80 
     An ink cartridge according to Structure Example J-78, wherein a first portion side of said identification projection is away from said first portion by not less than 41 mm and not more than 45 mm, as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example J-81 
     An ink cartridge according to any one of Structure Examples J-78-J-80 wherein a second portion side of said identification projection is away from said first portion by not less than 50 mm and not more than 60 mm, as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example J-82 
     An ink cartridge according to any one of Structure Examples J-78-J-80 wherein a second portion side of said identification projection is away from said first portion by not less than 55 mm and not more than 58 mm, as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example J-83 
     An ink cartridge according to any one of Structure Examples J-78-J-82, wherein said identification projection has a height of not less than 3 mm and not more than 10 mm. 
     Structure Example J-84 
     An ink cartridge according to any one of Structure Examples J-78-J-82, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said ID projection is provided on the portion having the relatively large diameter. 
     Structure Example J-85 
     An ink cartridge according to any one of Structure Examples J-1-J-84, wherein the movement in the different direction includes a rotation of said member about a rotational axis which is along the inserting direction. 
     Structure Example J-86 
     An ink cartridge according to any one of Structure Examples J-1-J-84, wherein by rotation of said ink cartridge about a center axis of said ink cartridge, said pad electrodes are moved in the direction different from the inserting direction. 
     Structure Example J-87 
     An ink cartridge according to any one of Structure Examples J-1-J-84, wherein by rotation of said ink cartridge about a axis of said ink receiving tube, said pad electrode are moved in the direction different from the inserting direction. 
     Structure Example J-88 
     An ink cartridge according to any one of Structure Example J-85-J-87, wherein the rotation is a screw rotation. 
     Structure Example J-89 
     An ink cartridge according to any one of Structure Examples J-85-J-88, wherein during the rotation, said ink cartridge moves in the inserting direction. 
     Structure Example J-90 
     An ink cartridge according to any one of Structure Examples J-85-J-89, wherein an angle of the rotation of said ink cartridge up to insertion of said ink receiving tube into the inserting portion is not less than 10° and not more than 40°. 
     Structure Example J-91 
     An ink cartridge according to any one of Structure Examples J-85-J-89, wherein an angle of the rotation of said ink cartridge up to insertion of said ink receiving tube into the inserting portion is not less than 20° and not more than 25°. 
     Structure Example J-92 
     An ink cartridge according to any one of Structure Examples J-85-J-91, wherein a angle of the rotation of said ink cartridge after the insertion of said ink cartridge in the inserting direction until said pad electrodes start to be inserted between two positioning walls of the mounting portion is not less than 40° in not more than 75°, wherein the positioning walls are opposed to each other with the electrical connecting portions interposed therebetween. 
     Structure Example J-93 
     An ink cartridge according to any one of Structure Examples J-85-J-91, wherein a angle of the rotation of said ink cartridge after the insertion of said ink cartridge in the inserting direction until said pad electrodes start to be inserted between two positioning walls of the mounting portion is not less than 55° in not more than 65°, wherein the positioning walls are opposed to each other with the electrical connecting portions interposed therebetween. 
     Structure Example J-94 
     An ink cartridge according to any one of Structure Example J-85-J-93, wherein an angle of rotation of said ink cartridge after the insertion in the inserting direction of said ink cartridge until said pad electrodes start to be brought into contact with electrical connecting portions is not less than 80° and not more than 90°. 
     Structure Example J-95 
     An ink cartridge according to any one of Structure Example J-85-J-93, wherein an angle of rotation of said ink cartridge after the insertion in the inserting direction of said ink cartridge until said pad electrodes start to be brought into contact with electrical connecting portions is not less than 80° and not more than 88°. 
     Structure Example J-96 
     An ink cartridge according to any one of Structure Examples J-1-J-95, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined with respect to a moving direction of said pad electrodes. 
     Structure Example J-97 
     An ink cartridge according to Structure Example J-96, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 60° relative to moving direction of said pad electrodes. 
     Structure Example J-98 
     An ink cartridge according to Structure Example J-96, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 70° relative to moving direction of said pad electrodes. 
     Structure Example J-99 
     An ink cartridge according to Structure Example J-96, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 80° relative to moving direction of said pad electrodes. 
     Structure Example J-100 
     An ink cartridge according to Structure Example J-96, wherein said pad electrodes have areas which are arranged so as to be crossed by a line perpendicular to the moving direction of said pad electrodes. Perpendicular to a moving direction of said pad electrodes. 
     Structure Example J-101 
     An ink cartridge according to any one of Structure Examples Structure Example-J-100, wherein said pad electrodes have the areas which are arranged so as to be crossed by a line inclined relative to a direction inclined relative to a direction from the first portion toward the second portion. 
     Structure Example J-102 
     An ink cartridge according to Structure Example J-101, wherein said pad electrodes have the areas arranged so as to be crossed by a line inclined by not less than 10° and not more than 60° relative to the direction from the first portion toward the second portion. 
     Structure Example J-103 
     An ink cartridge according to Structure Example J-101, wherein said pad electrodes have the areas arranged so as to be crossed by a line inclined by not less than 40° and not more than 60° relative to the direction from the first portion toward the second portion. 
     Structure Example J-104 
     An ink cartridge accoutering to any one of Structure Examples J-1-J-103, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined relative to the inserting direction of said ink the cartridge. 
     Structure Example J-105 
     An ink cartridge according to Structure Example J-104, wherein said pad electrodes have the areas which are arranged so as to be crossed by a line inclined by not less than 10° and not more than 60° relative to the inserting direction of said ink cartridge. 
     Structure Example J-106 
     An ink cartridge according to Structure Example J-104, wherein said pad electrodes have the areas which are arranged so as to be crossed by a line inclined by not less than 40° and not more than 60° relative to the inserting direction of said ink cartridge. 
     Structure Example J-107 
     An ink cartridge according to any one of Structure Examples J-1-J-106, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined relative to the longitudinal direction of said ink cartridge. 
     Structure Example J-108 
     An ink cartridge according to Structure Example J-107, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined not less than 10° and not more than 60° relative to the longitudinal direction of said ink cartridge. 
     Structure Example J-109 
     An ink cartridge according to Structure Example J-107, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined not less than 40° and not more than 60° relative to the longitudinal direction of said ink cartridge. 
     Structure Example K 
     Structure Example K-1 
     An ink cartridge comprising: a plurality of pad electrodes, 
     a first portion including an outwardly facing surface and provided with an inserting portion into which the ink receiving tube is capable of being inserted; 
     a second portion opposite from said first portion; and 
     a third portion connecting said first portion and said second portion with each other and provided with a plurality of pad electrodes, 
     wherein said third portion is provided with a guide portion extending in a direction crossing with a direction from said first portion to said second portion. 
     Structure Example K-2 
     An ink cartridge according to any one of Structure Example K-1, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and said electrical contact points are disposed at positions away from said first portion by not less than 5 mm and not more than 25 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example K-3 
     An ink cartridge according to any one of Structure Example K-1, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and said electrical contact points are disposed at positions away from said first portion by not less than 10 mm and not more than 20 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example K-4 
     An ink cartridge according to any one of Structure Examples K-1-K-3, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein one of said electrical contact points that is closest to said first portion is disposed at a position away from said first portion by not less than 5 mm and not more than 15 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example K-5 
     An ink cartridge according to any one of Structure Examples K-1-K-3, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein one of said electrical contact points that is closest to said first portion is disposed at a position away from said first portion by not less than 10 mm and not more than 11 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example K-6 
     An ink cartridge according to any one of Structure Examples K-1-K-5, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein one of said electrical contact points that is most remote from said first portion is disposed at a position away from said first portion by not less than 15 mm and not more than 25 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example K-7 
     An ink cartridge according to any one of Structure Examples K-1-K-5, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein one of said electrical contact points that is most remote from said first portion is disposed at a position away from said first portion by not less than 17 mm and not more than 18 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example K-8 
     An ink cartridge according to any one of Structure Examples K-1-K-7, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein a direction in which said electrical contact points are arranged crosses with a direction from said first portion toward said second portion. 
     Structure Example K-9 
     An ink cartridge according to Structure Example K-8, wherein a direction in which said electrical contact points are arranged is inclined by not less than 20° and not more than 40° relative to a directional from said first portion toward said second portion. 
     Structure Example K-10 
     An ink cartridge according to Structure Example K-8, wherein a direction in which said electrical contact points are arranged is inclined by not less than 30° and not more than 35° relative to a directional from said first portion toward said second portion. 
     Structure Example K-11 
     An ink cartridge according to any one of Structure Examples K-1-K-10, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein a direction in which said electrical contact points are arranged crosses with a longitudinal direction of said ink cartridge. 
     Structure Example K-12 
     An ink cartridge according to Structure Example K-11, wherein a direction in which said electrical contact points are arranged is inclined relative to a longitudinal direction of said ink cartridge by not less than 20° and not more than 40°. 
     Structure Example K-13 
     An ink cartridge according to Structure Example K-11, wherein a direction in which said electrical contact points are arranged is inclined relative to a longitudinal direction of said ink cartridge by not less than 30° and not more than 35°. 
     Structure Example K-14 
     An ink cartridge according to any one of Structure Examples K-1-K-13, wherein a direction in which said electrical contact points are arranged crosses with the inserting direction. 
     Structure Example K-15 
     An ink cartridge according to Structure Example K-14, wherein a direction in which said electrical contact points are arranged crosses with the inserting direction at a angle of not less than 20° and not more than 40°. 
     Structure Example K-16 
     An ink cartridge according to Structure Example K-14, wherein a direction in which said electrical contact points are arranged crosses with the inserting direction at a angle of not less than 30° and not more than 35°. 
     Structure Example K-17 
     An ink cartridge according to any one of Structure Examples K-1-K-16, wherein the electrical connecting portions are provided in a recording device. 
     Structure Example K-18 
     An ink cartridge according to any one of Structure Examples K-1-K-17, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and all of said electrical contact points are gravity centers of the respective pad electrodes, respectively. 
     Structure Example K-19 
     An ink cartridge according to any one of Structure Examples K-1-K-18, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and in a part of said pad electrodes, said electrical contact points are gravity centers of the pad electrodes, and in the other part of said pad electrodes, said electrical contact points are not gravity centers of said pad electrodes. 
     Structure Example K-20 
     An ink cartridge according to any one of Structure Examples K-1-K-19, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portions, and wherein each of said pad electrodes has a length from the electrical contact point is not less than 0.5 mm and not more than 4.0 mm. 
     Structure Example K-21 
     An ink cartridge according to any one of Structure Examples K-1-K-20, wherein said guide portion is configured to rotate said ink cartridge. 
     Structure Example K-22 
     An ink cartridge according to any one of Structure Examples K-1-K-21, wherein said pad electrodes include respective electrical contact points electrically connectable with the electrical connecting portion, and wherein said electrical contact points are arranged in a direction crossing with the direction in which said guide portion extends. 
     Structure Example K-23 
     An ink cartridge according to Structure Example K-22, wherein the direction in which said electrical contact points are arranged is inclined relative to the direction in which said guide portion extends by not less than 60°. 
     Structure Example K-24 
     An ink cartridge according to Structure Example K-22, wherein the direction in which said electrical contact points are arranged is inclined relative to the direction in which said guide portion extends by not less than 70°. 
     Structure Example K-25 
     An ink cartridge according to Structure Example K-22, wherein the direction in which said electrical contact points are arranged is inclined relative to the direction in which said guide portion extends by not less than 75°. 
     Structure Example K-26 
     An ink cartridge according to any one of Structure Examples K-22-K-25, wherein the direction in which said electrical contact points are arranged is inclined relative to the direction in which said guide portion extends by not more than 85° 
     Structure Example K-27 
     An ink cartridge according to any one of Structure Examples K-1-K-26, wherein said guide portion includes a groove. 
     Structure Example K-28 
     An ink cartridge according to Structure Example K-27, wherein said groove has a screw-shape. 
     Structure Example K-29 
     An ink cartridge according to Structure Example K-27 or K-28, wherein said guide portion has a depth of not less than 1.0 mm and not more than 5.0 mm. 
     Structure Example K-30 
     An ink cartridge according to Structure Example K-27 or K-28, wherein said guide portion has a depth of not less than 2.0 mm and not more than 4.0 mm. 
     Structure Example K-31 
     An ink cartridge according to any one of Structure Example K-27-K-30, further comprising a rib provided inside said guide portion. 
     Structure Example K-32 
     An ink cartridge according to Structure Example K-31, wherein said rib has a height of not less than 1.5 mm and not more than 2.0 mm. 
     Structure Example K-33 
     An ink cartridge according to Structure Example K-31 or K-32, wherein said rib has a height smaller than a depth of said guide portion. 
     Structure Example K-34 
     An ink cartridge according to any one of Structure Examples K-31-K-33, wherein a gravity center of said rib is disposed at the position away from said first portion by not less than 40 mm and not more than 50 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example K-35 
     An ink cartridge according to any one of Structure Examples K-1-K-34, wherein said guide portion extends in a direction crossing with a direction from said first portion to said second portion. 
     Structure Example K-36 
     An ink cartridge according to Structure Example K-35, wherein a direction in which said guide portion extends is inclined by not less than 50° and not more than 80° relative to a direction from said first portion to said second portion. 
     Structure Example K-37 
     An ink cartridge according to Structure Example K-35, wherein a direction in which said guide portion extends is inclined by not less than 60° and not more than 70° relative to a direction from said first portion to said second portion. 
     Structure Example K-38 
     An ink cartridge according to any one of Structure Example K-1 or K-37, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said guide portion is provided on the portion having the relatively large diameter. 
     Structure Example K-39 
     An ink cartridge according to Structure Example K-1 or K-38, further comprising a second guide portion at a position opposed to said first mentioned guide portion. 
     Structure Example K-40 
     An ink cartridge according to any one of Structure Example K-1 or K-39, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined with respect to a direction in which said guide portion extends. 
     Structure Example K-41 
     An ink cartridge according to Structure Example K-40, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 60° relative to a direction in which said guide portion extends. 
     Structure Example K-42 
     An ink cartridge according to Structure Example K-40, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 70° relative to a direction in which said guide portion extends. 
     Structure Example K-43 
     An ink cartridge according to Structure Example K-40, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 75° relative to a direction in which said guide portion extends. 
     Structure Example K-44 
     An ink cartridge according to any one of Structure Examples K-40-K-43, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not more than 85° with respect to a direction in which said guide portion extends. 
     Structure Example K-45 
     An ink cartridge according to any one of Structure Examples K-1-K-44, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said pad electrodes are provided on the portion having the relatively small diameter. 
     Structure Example K-46 
     An ink cartridge according to Structure Example K-45, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said pad electrodes are provided on and are bridged between the portion having the relatively small diameter and on the portion having the relatively large diameter. 
     Structure Example K-47 
     An ink cartridge according to Structure Example K-45 or K-46, wherein the relatively large diameter is not less than 50 mm and not more than 80 mm. 
     Structure Example K-48 
     An ink cartridge according to any one of Structure Examples K-45-K-47, wherein the relatively small diameter is not less than 20 mm and not more than 30 mm. 
     Structure Example K-49 
     An ink cartridge according to any one of Structure Examples K-45-K-48, wherein a length of the relatively large diameter portion as measured in the direction parallel to the direction from the first portion toward the second portion is not less than 190 mm and not more than 220 mm. 
     Structure Example K-50 
     An ink cartridge according to any one of Structure Examples K-45-K-48, wherein a length of the relatively small diameter portion as measured in the direction parallel to the direction from the first portion toward the second portion is not less than 20 mm and not more than 30 mm. 
     Structure Example K-51 
     An ink cartridge according to any one of Structure Example K-1-K-50, wherein said third portion is provided with a projected portion. 
     Structure Example K-52 
     An ink cartridge according to Structure Example K-51, wherein said pad electrodes are provided on said projected portion. 
     Structure Example K-53 
     An ink cartridge according to any one of Structure Example K-51 or-K-52, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said projected portion is provided on the portion having the relatively small diameter. 
     Structure Example K-54 
     An ink cartridge according to any one of Structure Examples K-51-K-53, wherein said projected portion has a top side and which said pad electrodes are provided, and said side has a maximum side length of not less than 9 mm and not more than 16 mm, as seen in a direction facing the top side. 
     Structure Example K-55 
     An ink cartridge according to any one of Structure Examples K-51-K-54, wherein said projected portion has a height of not less than 3 mm and not more than 10 mm. 
     Structure Example K-56 
     An ink cartridge according to any one of Structure Examples K-51-K-54, wherein said projected portion has a height of not less than 3 mm and not more than 8 mm. 
     Structure Example K-57 
     An ink cartridge according to any one of Structure Examples K-51-K-56, wherein a first portion side of said projected portion is disposed at a position away from said first portion by not less than 5 mm and not more than 10 mm, as measured in a direction parallel with a direction from said first portion toward said second portion. 
     Structure Example K-58 
     An ink cartridge according to any one of Structure Examples K-51-K-56, wherein a first portion side of said projected portion is disposed at a position away from said first portion by not less than 6 mm and not more than 7 mm, as measured in a direction parallel with a direction from said first portion toward said second portion. 
     Structure Example K-59 
     An ink cartridge according to any one of Structure Examples K-51-K-58, wherein a second portion side of said projected portion is disposed at a position away from said first portion by not less than 20 mm and not more than 25 mm, as measured in the direction from said first portion toward said second portion. 
     Structure Example K-60 
     An ink cartridge according to any one of Structure Examples K-51-K-58, wherein a second portion side of said projected portion is disposed at a position away from said first portion by not less than 22 mm and not more than 23 mm, as measured in the direction from said first portion toward said second portion. 
     Structure Example K-61 
     An ink cartridge according to any one of Structure Examples K-51-K-60, wherein an angle formed between a side surface of said projected portion in the direction from said first portion and said second portion is not less than 50° and not more than 70°. 
     Structure Example K-62 
     An ink cartridge according to any one of Structure Examples K-51-K-60, wherein an angle formed between a side surface of said projected portion in the direction from said first portion and said second portion is not less than 55° and not more than 60°. 
     Structure Example K-63 
     An ink cartridge according to any one of Structure Examples K-51-K-62, wherein a part of a side surface of said projected portion is protruded. 
     Structure Example K-64 
     An ink cartridge according to any one of Structure Examples K-51-K-63, wherein said projected portion is provided with a space below said pad electrodes. 
     Structure Example K-65 
     An ink cartridge according to Structure Example K-64, wherein said space is opened toward said first portion. 
     Structure Example K-66 
     An ink cartridge according to any one of Structure Examples K-51-K-65, wherein a space is provided below said pad electrodes. 
     Structure Example K-67 
     A member according to any one of Structure Examples K-64-K-66, wherein a supporting member provided in said mounting portion is capable of entering said space. 
     Structure Example K-68 
     An ink cartridge according to any one of Structure Examples K-64-K-67, wherein an outer periphery of said space has a maximum side length of not less than 10 mm and not more than 15 mm, as seen in a direction facing said pad electrode. 
     Structure Example K-69 
     An ink cartridge according to any one of Structure Examples K-66-K-68, wherein said space has a height of not less than 1 mm and not more than 5 mm. 
     Structure Example K-70 
     An ink cartridge according to any one of Structure Examples K-66-K-69, wherein said space has a height of not less than 1 mm and not more than 5 mm. 
     Structure Example K-71 
     An ink cartridge according to any one of Structure Examples K-66-K-70, wherein said space extends only a part of a region below said pad electrode. 
     Structure Example K-72 
     An ink cartridge according to any one of Structure Examples K-1-K-71, wherein said third portion is provided with a projection for identification of said member. 
     Structure Example K-73 
     An ink cartridge according to Structure Example K-72, wherein a first portion side of said identification projection is away from said first portion by not less than 40 mm and not more than 50 mm, as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example K-74 
     An ink cartridge according to Structure Example K-72, wherein a first portion side of said identification projection is away from said first portion by not less than 41 mm and not more than 45 mm, as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example K-75 
     An ink cartridge according to any one of Structure Examples K-72-K-74 wherein a second portion side of said identification projection is away from said first portion by not less than 50 mm and not more than 60 mm, as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example K-76 
     An ink cartridge according to any one of Structure Examples K-72-K-74 wherein a second portion side of said identification projection is away from said first portion by not less than 55 mm and not more than 58 mm, as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example K-77 
     An ink cartridge according to any one of Structure Examples K-72-K-76, wherein said identification projection has a height of not less than 3 mm and not more than 10 mm. 
     Structure Example K-78 
     An ink cartridge according to any one of Structure Examples K-72-K-77, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said ID projection is provided on the portion having the relatively large diameter. 
     Structure Example K-79 
     An ink cartridge according to any one of Structure Examples K-1-K-78, wherein said pad electrodes have the areas which are arranged so as to be crossed by a line inclined relative to a direction inclined relative to a direction from the first portion toward the second portion. 
     Structure Example K-80 
     An ink cartridge according to Structure Example K-79, wherein said pad electrodes have the areas arranged so as to be crossed by a line inclined by not less than 10° and not more than 60° relative to the direction from the first portion toward the second portion. 
     Structure Example K-81 
     An ink cartridge according to Structure Example K-79, wherein said pad electrodes have the areas arranged so as to be crossed by a line inclined by not less than 40° and not more than 60° relative to the direction from the first portion toward the second portion. 
     Structure Example K-82 
     An ink cartridge according to any one of Structure Examples K-1-K-81, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined relative to the longitudinal direction of said ink cartridge. 
     Structure Example K-83 
     An ink cartridge according to Structure Example K-82, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined not less than 10° and not more than 60° relative to the longitudinal direction of said ink cartridge. 
     Structure Example K-84 
     An ink cartridge according to Structure Example K-82, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined not less than 40° and not more than 60° relative to the longitudinal direction of said ink cartridge. 
     Structure Example L 
     An ink cartridge mountable to a mounting portion provided with an ink receiving tube and a plurality of electrical connecting portions, said ink cartridge comprising: 
     a first portion including an outwardly facing surface and provided with an inserting portion into which the ink receiving tube is capable of being inserted; 
     a second portion opposite from said first portion; 
     a third portion connecting said first portion and said second portion with each other and provided with a plurality of pad electrodes electrically connectable with said electrical connecting portions, 
     wherein said pad electrodes include respective electrical contact points electrically connectable with said electrical connecting portions, and wherein a direction in which electrical contact points are arranged crosses with a moving direction of said pad electrodes. 
     Structure Example M 
     An ink cartridge mountable to a mounting portion provided with an ink receiving tube and a plurality of electrical connecting portions, said ink cartridge comprising: 
     a first portion including an outwardly facing surface and provided with an inserting portion into which the ink receiving tube is capable of being inserted; 
     a second portion opposite from said first portion; and 
     a third portion connecting said first portion and said second portion with each other and provided with a plurality of pad electrodes electrically connectable with said electrical connecting portions, 
     wherein said pad electrodes include respective electrical contact points electrically connectable with said electrical connecting portions, and wherein a direction in which said electrical contact points are arranged crosses with a direction from said first portion to second portion. 
     Structure Example N 
     An ink cartridge mountable to a mounting portion provided with an ink receiving tube and a plurality of electrical connecting portions, said ink cartridge comprising: 
     a first portion including an outwardly facing surface and provided with an inserting portion into which the ink receiving tube is capable of being inserted; 
     a second portion opposite from said first portion; and 
     a third portion connecting said first portion and said second portion with each other and provided with a plurality of pad electrodes electrically connectable with said electrical connecting portions, 
     wherein said pad electrodes include respective electrical contact points electrically connectable with said electrical connecting portions, and wherein a direction in which said electrical contact points are arranged crosses with a longitudinal direction of said ink cartridge. 
     Structure Example O 
     An ink cartridge mountable to a mounting portion provided with an ink receiving tube and a plurality of electrical connecting portions, said ink cartridge comprising: 
     a first portion including an outwardly facing surface and provided with an inserting portion into which the ink receiving tube is capable of being inserted; 
     a second portion opposite from said first portion; and 
     a third portion connecting said first portion and said second portion with each other and provided with a plurality of pad electrodes electrically connectable with said electrical connecting portions, 
     wherein said third portion is provided with a screw-like groove. 
     Structure Example P 
     An ink cartridge mountable to a mounting portion provided with an ink receiving tube and a plurality of electrical connecting portions, said ink cartridge comprising: 
     a first portion including an outwardly facing surface and provided with an inserting portion into which the ink receiving tube is capable of being inserted; 
     a second portion opposite from said first portion; and 
     a third portion connecting said first portion and said second portion with each other and provided with a plurality of pad electrodes electrically connectable with said electrical connecting portions, 
     wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said pad electrodes are provided on the portion having the relatively small diameter, and a wherein said third portion is provided with a projected portion, wherein pad electrodes are provided on said projected portion. 
     Structure Example Q 
     An ink cartridge mountable to a mounting portion provided with an ink receiving tube and a plurality of electrical connecting portions, said ink cartridge comprising: 
     a first portion including an outwardly facing surface and provided with an inserting portion into which the ink receiving tube is capable of being inserted; 
     a second portion opposite from said first portion; and 
     a third portion connecting said first portion and said second portion with each other and provided with a plurality of pad electrodes electrically connectable with said electrical connecting portions, 
     wherein a space is provided below said pad electrode. 
     Structure Example R 
     Structure Example R-1 
     An ink cartridge containing ink, comprising: 
     a first portion provided with an ink discharge portion configured to discharge the ink, 
     a second portion opposite from said first portion; 
     a third portion connecting said first portion and said second portion with each other, 
     wherein said ink cartridges is rotatable about an axis extending along a direction from said first portion toward said second portion, and 
     wherein said ink discharge portion provided across the rotational axis; and 
     a plurality of pad electrodes provided on said third portion at a position closer to said first portion than to said second portion. 
     Structure Example R-2 
     An ink cartridge according to Structure Example R-1, wherein said third portion is provided with a projected portion, on which said pad electrodes are provided. 
     Structure Example R-3 
     An ink cartridge according to Structure Example R-1 or R-2, wherein a space is provided below said pad electrodes. 
     Structure Example R-4 
     An ink cartridge according to any one of Structure Examples R-1-R-3, wherein said pad electrodes are disposed at positions away from said first portion by not less than 5 mm and not more than 25 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example R-5 
     An ink cartridge according to any one of Structure Examples R-1-R-3, wherein said pad electrodes are disposed at positions away from said first portion by not less than 10 mm and not more than 20 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example R-6 
     An ink cartridge according to any one of Structure Examples R-1-R-5, wherein one of said pad electrodes that is closest to said first portion is disposed at a position away from said first portion by not less than 5 mm and not more than 15 mm as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example R-7 
     An ink cartridge according to any one of Structure Examples R-1-R-5, wherein one of said pad electrodes that is closest to said first portion is disposed at a position away from said first portion by not less than 10 mm and not more than 11 mm as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example R-8 
     An ink cartridge according to any one of Structure Examples R-1-R-7, wherein one of said pad electrodes that is most remote from said first portion is disposed at a position away from said first portion by not less than 15 mm and not more than 25 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example R-9 
     An ink cartridge according to any one of Structure Examples R-1-R-7, wherein one of said pad electrodes that is most remote from said first portion is disposed at a position away from said first portion by not less than 17 mm and not more than 18 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example R-10 
     An ink cartridge according to any one of Structure Examples R-1-R-9, wherein said third portion is provided with a guide portion configured to rotate said member. 
     Structure Example R-11 
     An ink cartridge according to Structure Example R-10, wherein said guide portion includes a groove. 
     Structure Example R-12 
     An ink cartridge according to Structure Example R-11, wherein said groove has a screw-shape. 
     Structure Example R-13 
     An ink cartridge according to Structure Example R-10 or R-12, wherein said guide portion has a depth of not less than 1.0 mm and not more than 5.0 mm. 
     Structure Example R-14 
     An ink cartridge according to Structure Example R-10 or R-13, wherein said guide portion has a depth of not less than 2.0 mm and not more than 4.0 mm. 
     Structure Example R-15 
     An ink cartridge according to any one of Structure Example R-10-R-14, further comprising a rib provided inside said guide portion. 
     Structure Example R-16 
     An ink cartridge according to Structure Example R-15, wherein said rib has a height of not less than 1.5 mm and not more than 2.0 mm. 
     Structure Example R-17 
     An ink cartridge according to Structure Example R-15 or R-16, wherein said rib has a height smaller than a depth of said guide portion. 
     Structure Example R-18 
     An ink cartridge according to any one of Structure Examples R-10-R-17, wherein said guide portion extends in a direction crossing with a direction from said first portion to said second portion. 
     Structure Example R-19 
     An ink cartridge according to Structure Example R-18, wherein a direction in which said guide portion extends is inclined by not less than 50° and not more than 80° relative to a direction from said first portion to said second portion. 
     Structure Example R-20 
     An ink cartridge according to Structure Example R-18, wherein a direction in which said guide portion extends is inclined by not less than 60° and not more than 70° relative to a direction from said first portion to said second portion. 
     Structure Example R-21 
     An ink cartridge according to any one of Structure Example R-10 or R-20, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said guide portion is provided on the portion having the relatively large diameter. 
     Structure Example R-22 
     An ink cartridge according to Structure Example R-10 or R-21, further comprising a second guide portion at a position opposed to said first mentioned guide portion. 
     Structure Example R-23 
     An ink cartridge according to any one of Structure Example R-10 or R-22, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined with respect to a direction in which said guide portion extends. 
     Structure Example R-24 
     An ink cartridge according to Structure Example R-23, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 60° relative to a direction in which said guide portion extends. 
     Structure Example R-25 
     An ink cartridge according to Structure Example R-23, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 70° relative to a direction in which said guide portion extends. 
     Structure Example R-26 
     An ink cartridge according to Structure Example R-23, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not less than 75° relative to a direction in which said guide portion extends. 
     Structure Example R-27 
     An ink cartridge according to any one of Structure Examples R-23-R-26, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined by not more than 85° with respect to a direction in which said guide portion extends. 
     Structure Example R-28 
     An ink cartridge according to any one of Structure Examples R-1-R-27, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said pad electrodes are provided on the portion having the relatively small diameter. 
     Structure Example R-29 
     An ink cartridge according to Structure Example A-28, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said pad electrodes are provided on and are bridged between the portion having the relatively small diameter and on the portion having the relatively large diameter. 
     Structure Example R-30 
     An ink cartridge according to Structure Example R-28 or R-29, wherein the relatively large diameter is not less than 50 mm and not more than 80 mm. 
     Structure Example R-31 
     An ink cartridge according to any one of Structure Examples R-28-R-30, wherein the relatively small diameter is not less than 20 mm and not more than 30 mm. 
     Structure Example R-32 
     An ink cartridge according to any one of Structure Examples R-28-R-31, wherein a length of the relatively large diameter portion as measured in the direction parallel to the direction from the first portion toward the second portion is not less than 190 mm and not more than 220 mm. 
     Structure Example R-33 
     An ink cartridge according to any one of Structure Examples R-28-R-32, wherein a length of the relatively small diameter portion as measured in the direction parallel to the direction from the first portion toward the second portion is not less than 20 mm and not more than 30 mm. 
     Structure Example R-34 
     An ink cartridge according to any one of Structure Examples R-1-R-33, wherein said third portion is provided with a projected portion, and wherein said projected portion has a top side and which said pad electrodes are provided, and said side has a maximum side length of not less than 9 mm and not more than 16 mm, as seen in a direction facing the top side. 
     Structure Example R-35 
     An ink cartridge according to Structure Examples R-1-R-34, wherein said third portion is provided with a projected portion, and wherein said projected portion has a height of not less than 3 mm and not more than 10 mm. 
     Structure Example R-36 
     An ink cartridge according to Structure Examples R-1-R-35, wherein said third portion is provided with a projected portion, and wherein said projected portion has a height of not less than 3 mm and not more than 8 mm. 
     Structure Example R-37 
     An ink cartridge according to any one of Structure Examples R-1-R-36, wherein said third portion is provided with a projected portion, and wherein a first portion side of said projected portion is disposed at a position away from said first portion by not less than 5 mm and not more than 10 mm, as measured in a direction parallel with a direction from said first portion toward said second portion. 
     Structure Example R-38 
     An ink cartridge according to any one of Structure Examples R-1-R-37, wherein said third portion is provided with a projected portion, and wherein a first portion side of said projected portion is disposed at a position away from said first portion by not less than 6 mm and not more than 7 mm, as measured in a direction parallel with a direction from said first portion toward said second portion. 
     Structure Example R-39 
     An ink cartridge according to any one of Structure Examples R-1-R-38, wherein said third portion is provided with a projected portion, and wherein a second portion side of said projected portion is disposed at a position away from said first portion by not less than 20 mm and not more than 25 mm, as measured in the direction from said first portion toward said second portion. 
     Structure Example R-40 
     An ink cartridge according to any one of Structure Examples R-1-R-38, wherein said third portion is provided with a projected portion, and wherein a second portion side of said projected portion is disposed at a position away from said first portion by not less than 22 mm and not more than 23 mm, as measured in the direction from said first portion toward said second portion. 
     Structure Example R-41 
     An ink cartridge according to any one of Structure Examples R-1-R-40, wherein said third portion is provided with a projected portion, and wherein an angle formed between a side surface of said projected portion in the direction from said first portion and said second portion is not less than 50° and not more than 70°. 
     Structure Example R-42 
     An ink cartridge according to any one of Structure Examples R-1-R-41, wherein said third portion is provided with a projected portion, and wherein an angle formed between a side surface of said projected portion in the direction from said first portion and said second portion is not less than 55° and not more than 60°. 
     Structure Example R-43 
     An ink cartridge according to any one of Structure Examples R-1-R-42, wherein said third portion is provided with a projected portion, and a part of a side surface of said projected portion is protruded. 
     Structure Example R-44 
     An ink cartridge according to any one of Structure Examples R-1-R-43, wherein said third portion is provided with a projected portion, and a space is provided below said pad electrodes, and wherein said space is opened toward a first portion side of said projected portion. 
     Structure Example R-45 
     An ink cartridge according to any one of Structure Example R-1-R-44, wherein a space is provided below said pad electrodes, and wherein an outer periphery of said space has a maximum side length of not less than 10 mm and not more than 15 mm, as seen in a direction facing said pad electrode. 
     Structure Example R-46 
     An ink cartridge according to any one of Structure Examples R-1-R-45, wherein a space provided below said pad electrodes, and said space as a height not less than 1 mm and not more than 5 mm. 
     Structure Example R-47 
     An ink cartridge according to any one of Structure Examples R-1-R-46, wherein a space provided below said pad electrodes, and said space as a height not less than 2 mm and not more than 3 mm. 
     Structure Example R-48 
     An ink cartridge according to any one of Structure Examples R-1-R-47, wherein said third portion is provided with a projection for identification of said member. 
     Structure Example R-49 
     An ink cartridge according to Structure Example R-48, wherein a first portion side of said identification projection is away from said first portion by not less than 40 mm and not more than 50 mm, as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example R-50 
     An ink cartridge according to Structure Example R-48, wherein a first portion side of said identification projection is away from said first portion by not less than 41 mm and not more than 45 mm, as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example R-51 
     An ink cartridge according to any one of Structure Examples R-48-R-50 wherein a second portion side of said identification projection is away from said first portion by not less than 50 mm and not more than 60 mm, as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example R-52 
     An ink cartridge according to any one of Structure Examples R-48-R-50 wherein a second portion side of said identification projection is away from said first portion by not less than 55 mm and not more than 58 mm, as measured in a direction parallel with the direction from said first portion to said second portion. 
     Structure Example R-53 
     An ink cartridge according to any one of Structure Examples R-48-R-52, wherein said identification projection has a height of not less than 3 mm and not more than 10 mm. 
     Structure Example R-54 
     An ink cartridge according to any one of Structure Examples R-48-R-53, wherein said second portion has a portion having a relatively large diameter, and said first portion has a portion having the relatively small diameter, and wherein said ID projection is provided on the portion having the relatively large diameter. 
     Structure Example R-55 
     An ink cartridge according to any one of Structure Examples R-1-R-54, wherein said pad electrodes have the areas which are arranged so as to be crossed by a line inclined relative to a direction inclined relative to a direction from the first portion toward the second portion. 
     Structure Example R-56 
     An ink cartridge according to Structure Example R-55, wherein said pad electrodes have the areas arranged so as to be crossed by a line inclined by not less than 10° and not more than 60° relative to the direction from the first portion toward the second portion. 
     Structure Example R-57 
     An ink cartridge according to Structure Example R-55, wherein said pad electrodes have the areas arranged so as to be crossed by a line inclined by not less than 40° and not more than 60° relative to the direction from the first portion toward the second portion. 
     Structure Example R-58 
     An ink cartridge according to any one of Structure Examples R-1-R-57, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined relative to the longitudinal direction of said ink cartridge. 
     Structure Example R-59 
     An ink cartridge according to Structure Example R-58, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined not less than 10° and not more than 60° relative to the longitudinal direction of said ink cartridge. 
     Structure Example R-60 
     An ink cartridge according to Structure Example R-58, wherein said pad electrodes have areas which are arranged so as to be crossed by a line inclined not less than 40° and not more than 60° relative to the longitudinal direction of said ink cartridge. 
     Structure Example R-61 
     An ink cartridge according to any one of Structure Examples R-1-R-60, wherein said first portion has a diameter of not less than 8 mm and not more than 14 mm. 
     Structure Example R-62 
     An ink cartridge according to any one of Structure Examples R-1-R-61, wherein one of said pad electrodes that is closest to said first portion is disposed at a position away from said first portion by not less than 5 mm and not more than 15 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example R-63 
     An ink cartridge according to any one of Structure Examples R-1-R-61, wherein one of said pad electrodes that is closest to said first portion is disposed at a position away from said first portion by not less than 10 mm and not more than 11 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example R-64 
     An ink cartridge according to any one of Structure Examples R-1-R-63, wherein one of said pad electrodes that is most remote from said first portion is disposed at a position away from said first portion by not less than 15 mm and not more than 25 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example R-65 
     An ink cartridge according to any one of Structure Examples R-1-R-63, wherein one of said pad electrodes that is most remote from said first portion is disposed at a position away from said first portion by not less than 17 mm and not more than 18 mm as measured in a direction parallel with the direction from said first portion toward said second portion. 
     Structure Example R-66 
     An ink cartridge according to any one of Structure Examples R-1-R-65, wherein each of said pad electrodes has a width of not less than 5 mm and not more than 10 mm. 
     Structure Example R-67 
     An ink cartridge according to any one of Structure Examples R-1-R-65, wherein each of said pad electrodes has a width of not less than 6 mm and not more than 9 mm. 
     Structure Example R-68 
     An ink cartridge according to any one of Structure Examples R-1-R-65, wherein each of said pad electrodes has a width of not less than 7 mm and not more than 8 mm. 
     Structure Example R-69 
     An ink cartridge according to any one of Structure Examples R-1-R-68, wherein a length, measured in a direction facing said third surface, between said pad electrodes and a axis of a minimum length line connecting between said ink discharge portion and said second portion is not less than 15 mm and not more than 20 mm. 
     Structure Example R-70 
     An ink cartridge according to any one of Structure Examples R-1-R-68, wherein a length, measured in a direction facing said third surface, between said pad electrodes and a axis of a minimum length line connecting between said ink discharge portion and said second portion is not less than 16 mm and not more than 18 mm. 
     Structure Example R-71 
     An ink cartridge according to any one of Structure Examples R-1-R-70, wherein a line distance between said ink discharge portion and said pad electrodes is not less than 15 mm and not more than 25 mm. 
     Structure Example R-72 
     An ink cartridge according to Structure Example R-71, wherein a difference in the line distance between one of said pad electrodes that is closest to said ink discharge portion and one of said pad electrodes most remote from said ink discharge portion is not less than 2 mm and not more than 4 mm. 
     Structure Example S 
     Structure Example S-1 
     An ink cartridge according to any one of Structure Examples J-1-J-109, K-1-K-84, L, M, N, O, P, Q, R-1-R-72, wherein said ink cartridge has a generally cylindrical shape. 
     Structure Example S-2 
     An ink cartridge according to any one of Structure Examples J-1-J-109, K-1-K-84, L, M, N, O, P, Q and R-1-R-72, wherein said member has a polygonal prism shape. 
     Structure Example S-3 
     An ink cartridge according to any one of Structure Examples J-1-J-109, K-1-K-84, L, M, N, O, P, Q and R-1-R-72, wherein said member has a conical shape. 
     Structure Example S-4 
     An ink cartridge according to any one of Structure Examples J-1-J-109, K-1-K-84, L, M, N, O, P, Q and R-1-R-72, wherein said member has a polygonal pyramid shape. 
     Structure Example S-5 
     An ink cartridge according to any one of Structure Examples J-1-J-109, K-1-K-84, L, M, N, O, P, Q, R-1-R-72 and R-72, S-1-S-4, wherein said member has a polygonal pyramid shape. 
     Structure Example S-6 
     An ink cartridge according to any one of Structure Examples J-1-J-109, K-1-K-84, L, M, N, O, P, Q, R-1, Q, R-1-R-72, and S-1-S-5, further comprising a casing including the first portion and the second portion, wherein a portion on a first portion side is rotatable independently of said casing. 
     Structure Example S-7 
     An ink cartridge according to any one of Structure Examples J-1-J-109, K-1-K-84, L, M, N, O, P, Q, R-1, Q, R-1-R-72, and S-1-S-6, further comprising a grip portion at a position closer to said second portion than to said first portion. 
     Structure Example S-8 
     An ink cartridge according to any one of Structure Examples J-1-J-109, K-1-K-84, L, M, N, O, P, Q, R-1-R-72, S-1-S-7, wherein said ink cartridge contains ink. 
     Structure Example S-9 
     An ink cartridge according to Structure Example S-5, wherein the ink is contained inside said inner layer. 
     Structure Example T 
     An ink cartridge containing ink, comprising: 
     a casing containing ink and extending in a longitudinal direction, 
     wherein said casing including a first end portion and a second end portion opposed to said first end portion in the longitudinal direction, and said casing is rotatable about a rotational axis passing through said first end portion and said second end portion; 
     an ink discharge portion provided in said first end portion on the rotational axis; and 
     a chips having a plurality of pad electrodes at a position adjacent to said first end portion on a peripheral surface portion extending in the longitudinal direction between said first end portion and said second end portion; 
     wherein said pad electrodes are arranged in a direction inclined relative to the rotational axis. 
     Structure Example U 
     An ink cartridge containing ink, comprising: 
     a first portion provided with an ink discharge portion configured to discharge the ink, a second portion opposite from said first portion, and a third portion connecting said first portion and said second portion with each other, 
     wherein said ink cartridge is rotatable about a rotational axis extending from said first portion toward said second portion, 
     wherein said ink discharge portion is provided on the rotational axis; and 
     a plurality of pad electrode provided on said third portion at a position closer to said first portion than to said second portion. 
     Structure Example V 
     An ink cartridge comprising: 
     a first section including a first portion ( 20   a ) including an outwardly facing the surface; 
     a second section including a second portion ( 20   b ) opposite from said first portion, said first section having a dimension measured in a direction perpendicular to a direction from said first portion toward said second portion smaller than that of said second section; 
     a table fixed on said first portion and having a top surface; 
     an IC tip provided on the top surface, the IC tip being provided with at least four electrode pads ( 27 ) facing away from the top surface; 
     wherein as seen in a direction perpendicular to the top surface, a line (U) which forms an angle (γ) within a range of 30-35° relative to the direction from said first portion toward said second portion and which passes through a point on one of said electrode pads that is most remote from said second section overlaps all of the other electrode pads. 
     Structure Example W 
     A recording apparatus comprising said member according to any one of Structure Examples A-1-A-109, B-1-B-84, C, D, E, F, G, H and I-1-I-10. 
     Structure Example X 
     An ink jet printer comprising said member according to any one of Structure Examples A-1-A-109, B-1-B-84, C, D, E, F, G, H and I-1-I-10. 
     Structure Example Y 
     A recording apparatus comprising said member according to any one of Structure Examples J-1-J-109, K-1-K-84, L, M, N, O, P, Q, R-1-R-72 and S-1-S-8. 
     Structure Example Z 
     A ink jet printer comprising an ink cartridge according to any one of Structure Example J-1-J-109, K-1-K-84, L, M, N, O, P, Q, R-1-R-72 and S-1-S-8. 
     INDUSTRIAL APPLICABILITY 
     According to the present invention, there is provided a member provided with pad electrodes and usable with a recording apparatus, an ink cartridge and a recording apparatus using the member. 
     While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.