Patent Publication Number: US-8529036-B2

Title: Liquid accommodating container and liquid ejecting apparatus

Description:
This application claims priority to Japanese Patent Application No. 2010-197328, filed Sep. 3, 2010 and Japanese Patent Application No. 2011-141300, filed Jun. 27, 2011. Both of these applications are incorporated herein by reference in their entireties. 
     BACKGROUND 
     1. Technical Field 
     The present invention relates to a liquid accommodating container and a liquid ejecting apparatus including the liquid accommodating container. 
     2. Related Art 
     A printer as an example of a liquid ejecting apparatus discharges ink from a print head to a recording target (for example, printing paper) to perform the printing. As a technique of supplying ink to the print head, a technique of using an ink cartridge with ink accommodated therein is used (for example, JP-A-2010-23458). Specifically, by mounting an ink cartridge on a holder provided with the print head, it is possible to supply ink from the ink cartridge to the print head. 
     When ink in the ink cartridge becomes low, in order for a user to be able to exchange the ink cartridge, the ink cartridge is configured so as to be attachable to or detachable from a holder of the printer. 
     As disclosed in JP-A-2010-23458, in some cases, a circuit board having a terminal group electrically connected to the printer is attached to the ink cartridge. The circuit board has a storage portion that stores information on the ink cartridge (for example, ink color information) and transmits various information between the storage portion and the printer. The circuit board is attached to side surface different from a bottom surface provided with an ink supply port so that an erroneous operation due to the attachment of ink does not occur. 
     Furthermore, in order to accurately perform the positioning of the ink cartridge relative to the holder and satisfactorily perform the electrical connection between the terminal group and the printer, a concave portion to be engaged with a convex portion provided in the holder is provided on the bottom surface of the ink cartridge. 
     JP-A-2006-142483 and JP-A-2007-230248 are examples of the related art. 
     However, in the configuration in which the concave portion is provided on the bottom surface of the ink cartridge, in some cases, it is difficult to satisfactorily maintain the electrical connection between the terminal group and the printer. For example, when the holder with the ink cartridge mounted thereon is moved in a main scanning direction to perform the printing (such as when the printing is performed by an on-carriage type printer), in some cases, external force is applied to the ink cartridge by the movement of the holder or the like. Furthermore, for example, when the ink cartridge is mounted on the holder in a position different from the print head (such as when the printing is performed by an off-carriage type printer), in some cases, the vibration (the external force) is also applied to the ink cartridge by the movement of the print head or the like. As mentioned above, when the external force is applied to the ink cartridge, in some cases, a relative position between the ink cartridge and the holder may be misaligned and the electrical connection blocked. Such a problem is common to a liquid accommodating container placed on a liquid ejecting apparatus in an attachable and detachable manner that includes a terminal group to be electrically connected to the liquid ejecting apparatus, without being limited to the ink cartridge. 
     Furthermore, in a configuration in which the concave portion is provided on the bottom surface of the ink cartridge, there is a possibility that an outer edge (e.g. a wall) of the concave portion provided on the bottom surface of the ink cartridge might interfere with the convex portion of the holder depending on the insertion angle of the liquid accommodating container when inserted into the liquid ejecting apparatus. Such a problem is common to a technique which includes a mechanism that restricts the movement of the liquid accommodating container to be mounted on the liquid ejecting apparatus in an attachable and detachable manner, without being limited to the ink cartridge. 
     SUMMARY 
     Advantageously, in one aspect, the invention provides a technique that suppresses the relative movement between the terminal group of the liquid accommodating container and the holder on which the liquid accommodating container is mounted. In another aspect, the invention provides a technique that ensures a range of acceptable insertion angles of the liquid accommodating container when mounted on the liquid ejecting apparatus. 
     The invention can be realized in many forms and aspects, examples of which are described herein. 
     [Aspect 1] In this aspect, the invention includes a liquid accommodating container that can be attached to or detached from a liquid ejecting apparatus. The liquid accommodating container includes: a container main body that forms a liquid accommodation chamber for holding liquid in an inner portion thereof, the chamber having a liquid supply port for distributing liquid held within the liquid accommodation chamber toward the outside; a terminal group having a plurality of terminals configured so as to be electrically connected with the liquid ejecting apparatus; and a first restriction portion engageable with a first apparatus side restriction portion of the liquid ejecting apparatus so as to restrict at least movement of the liquid accommodating container in a width direction when engaged. In this aspect, main body has a first wall, at least a portion of which becomes a bottom surface in a mounting posture when mounted onto the liquid ejecting apparatus. The first wall is connected to each of a second and third wall such that at least a portion of the second wall faces a portion of the third wall. The liquid supply port is provided in the first wall closer to the third wall than the second wall. The terminal group is provided in or on the second wall so as to be electrically connected with the liquid ejecting apparatus. The first restriction portion is provided in or on the second wall closer to the first wall surface than the terminal group and cooperates with the first apparatus side restriction portion of the liquid ejecting apparatus to restrict movement of the liquid accommodating container in at least a width direction. 
     In the liquid accommodating container described in Aspect 1, the first restriction portion provided in the second wall surface is separated from the liquid supply port further than is the terminal group mounted on the third wall surface. Thus, as compared to a case where the first restriction portion is provided in the first wall surface that is the bottom surface, this aspect suppresses undesired movement of the second wall surface having the terminal group in the width direction. 
     [Aspect 2] In the liquid accommodating container described in Aspect 1, the first apparatus side restriction portion included in the liquid ejecting apparatus may be a protrusion shape, and the corresponding first restriction portion of the container may be a notch into which the protrusion shaped first apparatus side restriction portion can be inserted. 
     According to the liquid accommodating container described in Aspect 2, having a notch as the first restriction portion reduces the possibility of the first restriction portion interfering with the liquid ejecting apparatus when mounting the liquid accommodating container on the liquid ejecting apparatus. As a result, it is possible to reduce the likelihood of the liquid accommodating container or the liquid ejecting apparatus being damaged. 
     [Aspect 3] In the liquid accommodating container described in Aspect 2, the first restriction portion may open toward at least a first direction when the liquid accommodating container is mounted on the liquid ejecting apparatus, and a second direction perpendicular to the first direction, the second direction going from the third wall surface toward the second wall surface. 
     According to the liquid accommodating container described in Aspect 3, since the first restriction portion opens toward at least the first and second direction, it is possible to reduce the possibility of a wall defining the first restriction portion interfering with the first apparatus side restriction portion, as opposed to a case where the first restriction portion is opened only in the first direction. This aspect of the invention allows for additional degrees of freedom (e.g. an increased range of acceptable insertion angles) of the liquid accommodating container when mounting the liquid accommodating container on the liquid ejecting apparatus. 
     [Aspect 4] In the liquid accommodating container described in Aspect 2 or Aspect 3, the notch may be provided in the second wall surface so as to overlap with a part of the terminal group in the length direction, that is, the direction in which the second and third walls face each other. 
     According to the liquid accommodating container described in Aspect 4, since the notch comprising the first restriction portion overlaps with the terminal group in the length direction, this positional relationship between the first restriction portion and terminal group further suppresses the movement of the terminal group in the width direction relative to the liquid ejecting apparatus. In addition, in Aspect 4, the liquid accommodating container may further include a container side engagement portion that is provided in the second wall and is engageable with an apparatus side engagement portion included in the liquid ejecting apparatus so as to restrict movement of the liquid accommodating container in the height direction perpendicular to the first wall surface, and a protrusion portion that is provided on an outer surface of the third wall for inserting into a hole portion included in the liquid ejecting apparatus so as to restrict movement of the liquid accommodation container in the height and width direction. By including the container side engagement portion and the protrusion portion, the movement of the liquid accommodating container relative to the liquid ejecting apparatus can be further suppressed. 
     [Aspect 5] In the liquid accommodating container described in any one of Aspects 1 to 4, the plurality of terminals of the terminal group may be placed so as to form a plurality of rows of terminals. A first row of the plurality, which is in a position adjacent the first restriction portion, includes more terminals than a second row which is in a position further from the first restriction portion than the first row. 
     As the first restriction portion suppresses movement of the liquid accommodation container in the width direction, such movement is particularly restricted closest to the first restriction portion. According to the liquid accommodating container described in Aspect 5, since the first row of terminals is positioned closer to the first restriction portion than the second row, this configuration makes it possible to satisfactorily maintain the contact of the respective terminals of the first and second rows with the liquid ejecting apparatus. 
     [Aspect 6] In the liquid accommodating container described in Aspect 5, the plurality of rows including the first and second rows may include more terminals than the rows which are in the position closer to the first restriction portion. 
     According to the liquid accommodating container described in Aspect 6, since the movement of the width direction is suppressed close to the first restriction portion, many terminals are included in the row closest to the first restriction portion so as to maintain satisfactory contact of the respective terminals with the liquid ejecting apparatus. 
     [Aspect 7] In the liquid accommodating container described in any one Aspect 1 to 6, the liquid accommodating container may further include a prism situated in the first wall between the liquid supply port and the second wall, the prism extending from the first wall into the liquid accommodation chamber. The prism is used to optically detect an amount of the liquid of the liquid accommodation chamber by utilizing a reflection surface which can reflect an irradiation light irradiated from outside the liquid accommodation chamber toward an optical detection apparatus. Depending on the refractive index of fluid coming into contact with the reflection surface, the reflection state is changed so that when the level of the liquid within the accommodation chamber falls below the reflection surface (e.g. low or empty), the amount of liquid remaining within the chamber can be determined by the change in the reflection state sensed by the optical detection apparatus. 
     According to the liquid accommodating container described in Aspect 7, it is possible to detect the remaining quantity of liquid by the use of the prism. Furthermore, since the movement of the liquid accommodating container in the width direction is restricted by the first restriction portion provided in the second wall, the movement (deviation) of the prism relative to the liquid ejecting apparatus can be suppressed. Thus, the remaining quantity of liquid can be more accurately detected. 
     [Aspect 8] In the liquid accommodating container described in Aspect 7, the prism may be placed in contact with an inner surface of the second wall. 
     According to the liquid accommodating container described in Aspect 8, since the prism is provided in contact with the second wall having the first restriction portion, the movement (deviation) of the prism relative to the liquid ejecting apparatus in the width direction is further suppressed, as compared to a case where the prism is provided away from the second wall. Furthermore, positioning the prism in contact with the inner surface of the second wall reduces the possibility of liquid in the liquid accommodation chamber not being able to reach the liquid supply port due to interference by the prism. That is, according to the liquid accommodating container described in Aspect 7 and 8, it is possible to more accurately detect the remaining quantity of liquid by the use of the prism and further reduce the quantity of liquid retained in the liquid accommodation chamber. 
     [Aspect 9] In the liquid accommodating container described in Aspect 7, the liquid accommodating container may include two or more prisms, and a distance between the first wall and the reflection surface is sufficiently large so that the distance between the reflection surface and the optical detection apparatus is at least that of a length of the prism closest to the first restriction portion. 
     According to the liquid accommodating container described in Aspect 9, the state of the remaining quantity of liquid can be more specifically detected by using a plurality of prisms in which the distances between the first wall and the reflection surface of each prism are different. Furthermore, since the prisms are placed in a position close to the first restriction portion, to the extent the distance between the reflection surface and the optical detection apparatus is long, it is possible to reduce a difference in the detection accuracy of the remaining quantity of liquid using each prism. 
     [Aspect 10] In the liquid accommodating container described in any one of Aspect 7 to 9, a portion of the prism including the reflection surface may have a right angle isosceles triangular prism shape. 
     In general, by forming the reflection surface of the prism to have the right angle isosceles triangular shape, there is a tendency that, if the refractive indexes of fluid coming into contact with the reflection surface are different from each other, the reflection states of the irradiation light irradiated to the reflected surface are clearly different from each other. Thus, according to the liquid accommodating container described in Aspect 10, it is possible to further improve the detection accuracy of the remaining quantity of liquid using such prisms. 
     [Aspect 11] In the liquid accommodating container described in any one of Aspects 1 to 10, an inner surface of the second wall in the mounting posture may have an inclined surface that is tilted in a direction toward the liquid supply port as the inclined surface goes from an upper end to a lower end. 
     According to the liquid accommodating container described in Aspect 11, it is possible to cause liquid near the second wall to flow toward the liquid supply port with the inclined surface. As a result, it is possible to reduce the quantity of liquid retained in the liquid accommodation chamber. 
     [Aspect 12] A liquid ejecting apparatus including the liquid accommodating container described in any one of Aspects 1 to 12. 
     According to the liquid ejecting apparatus described in Aspect 12, it is possible to provide a liquid ejecting apparatus that reduces the possibility that the electrical connection between the terminal group and the liquid ejecting apparatus becomes blocked. 
     In addition, the invention can be realized in various forms and can be realized in the form of a manufacturing method of the liquid accommodating container or the like including any configuration mentioned above, in addition to the configuration as the liquid accommodating container and the liquid ejecting apparatus including the liquid accommodating container. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements. 
         FIG. 1  is a diagram that shows a schematic configuration of a liquid ejecting apparatus. 
         FIG. 2  is an exterior perspective view of an exemplary holder with cartridge mounted thereon. 
         FIGS. 3A to 3D  are side, front, rear and bottom views of an exemplary cartridge. 
         FIGS. 4A to 4C  are cross-sections of an exemplary cartridge and prism. 
         FIGS. 5A and 5B  are front and side views of an exemplary terminal group. 
         FIGS. 6A and 6B  are exterior perspective views of an exemplary holder. 
         FIGS. 7A and 7B  depict detailed configurations of an exemplary apparatus. 
         FIG. 8  is a cross-sectional view taken from lines VIII-VIII of  FIG. 6A . 
         FIGS. 9A and 9B  are cross-sectional side views before and after attaching an exemplary cartridge. 
         FIGS. 10A and 10B  are cross-sectional side views showing the conditions of attaching an exemplary cartridge. 
         FIGS. 11A and 11B  show a cross-sectional side view and perspective view of an exemplary cartridge after mounting. 
         FIGS. 12A and 12B  are cross-sectional views depicting detaching of an exemplary cartridge. 
         FIGS. 13A and 13B  are cross-sectional side views depicting detaching of the exemplary cartridge. 
         FIGS. 14A to 14C  are cross-sectional side views depicting an alternative mounting method. 
         FIGS. 15A and 15B  are cross-sectional side views depicting an alternative mounting method. 
         FIGS. 16A and 16B  show another exemplary cartridge. 
         FIGS. 17A to 17E  show details of alternative embodiments. 
         FIGS. 18A and 18B  show another exemplary cartridge. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Next, embodiments of the invention will be described in the order as below.
     A. First Embodiment:   B. Second Embodiment:   C. Modified Example:   

     A. FIRST EXAMPLE 
     A-1. Configuration of Liquid Ejecting Apparatus 
       FIG. 1  is a diagram that shows a schematic configuration of a liquid ejecting apparatus  1  including a plurality of liquid accommodating containers  10  and a holder  20  as a first embodiment of the invention. The liquid ejecting apparatus  1  is an ink jet printer  1  (hereinafter, simply referred to as “printer  1 ”) that discharges ink to printing paper PA to perform printing. The printer  1  includes an ink cartridge  10  as a liquid accommodating container, a holder  20 , a first motor  52 , a second motor  50 , a control unit  60 , an operation portion  70 , a predetermined interface  72 , and an optical detection device  90 . In addition, hereinafter, the ink cartridge  10  is simply referred to as “cartridge  10 ”. 
     The holder  20  includes a print head (not shown) that discharges ink to a side facing the printing paper PA. Furthermore, the holder  20  has the cartridge  10  attachably and detachably mounted thereon. Each cartridge  10  is filled with an ink, such as cyan, magenta, and yellow inks Ink contained within the cartridge  10  is supplied to the print head of the holder  20  and the ink is discharged to the printing paper PA. 
     The first motor  52  drives the holder  20  in a main scanning direction. The second motor  50  transports the printing paper PA in a sub scanning direction. The control unit  60  controls an overall operation of the printer  1 . 
     The optical detection device  90  is fixed in a predetermined position. When the holder  20  is moved to a predetermined position, the optical detection device  90  irradiates the cartridge  10  with light so as to detect the remaining quantity of ink. 
     The control unit  60  controls the first motor  52 , the second motor  50  and the print head based on the print data received from a computer  80  or the like connected via a predetermined interface  72  to perform the printing. An operation portion  70  is connected to the control unit  60  and receives various operations from a user. 
       FIG. 2  is an exterior perspective view of the holder  20  with the cartridge  10  mounted thereon. For ease of explanation,  FIG. 2  shows an aspect in which one cartridge  10  is mounted on the holder  20 .  FIG. 2 , as well as  FIGS. 3-18B , shows an XYZ reference frame to specify directions, each of the XYZ axes perpendicular to each other. 
     The holder  20  has a configuration that can mount four cartridges  10 . The holder  20  and the cartridge  10  constitute a unit  5 . The number of cartridges  10  capable of being mounted on the holder  20  is not limited to four, and the configuration of the holder  20  may be changed depending on the number of the cartridges  10  required to be mounted. In a usage posture of the printer  1 , a Z axis positive direction becomes a vertical upward direction, and a Z axis negative direction becomes a vertical downward direction, and the main scanning direction of the printer  1  becomes a Y axis direction. The usage posture of the printer  1  refers to a posture of the printer  1  in the state in which the printer  1  is installed on a horizontal plane. In the present embodiment, the horizontal plane is defined by the X axis and the Y axis. The posture (state), in which the cartridge  10  is mounted on the holder  20  in this usage posture, is referred to as a mounting posture (a mounting state). 
     The holder  20  has a liquid supply pipe  240  that allows for fluid communication between the cartridge  10  and the print head of the holder  20 . Ink within the cartridge  10  is distributed to the print head via the liquid supply pipe  240 . Furthermore, an elastic member  242  around the liquid supply pipe  240  is provided for preventing ink from leaking to the outside. The cartridge  10  has a lever  120  as an elastically deformed elastic portion (an attachment and detachment mechanism). A user can detach the cartridge  10  from the holder  20  by operating the elastic portion  120 . The attachment or detachment operation of the cartridge  10  to the holder  20  will be described in further detail below. 
     A-2. Configuration of Cartridge 
     Next, a configuration of the cartridge  10  will be described using  FIGS. 3A to 4C .  FIGS. 3A to 3D  are side, front, rear and bottom view elevations, respectively, depicting the cartridge  10 .  FIG. 3A  is a side view of the cartridge  10 .  FIG. 3B  is a front view of the cartridge  10 .  FIG. 3C  is a rear view of the cartridge  10 .  FIG. 3D  is a bottom view of the cartridge  10 .  FIGS. 4A to 4C  are second diagrams for describing the cartridge  10 .  FIG. 4A  is a cross-sectional view taken from lines IVA-IVA of  FIG. 3B .  FIGS. 4B and 4C  are diagrams for describing a detection method of a remaining quantity of ink.  FIGS. 4B and 4C  show the cartridge  10  taken from lines IVBC-IVBC of  FIG. 4A . 
     As shown in  FIGS. 3A ,  3 B and  3 D, the cartridge  10  includes a container main body  100 , a lever  120 , a liquid supply port  110 , a circuit board  130 , and a prism unit  170   t . The container main body  100 , the lever  120 , and the liquid supply port  110  are formed of synthetic resin such as polypropylene. 
     As shown in  FIGS. 3A to 3D , the container main body  100  has a first wall (also referred to as a “bottom surface”)  100   a , a second wall (also referred to as a “front surface”)  100   b , a third wall (also referred to as a “back surface”)  100   c , a fourth wall (also referred to as an “upper surface”)  100   d , a fifth wall (also referred to as a “left side surface”)  100   e , and a sixth wall (also referred to as a “right side surface”)  100   f . The container main body  100  has a liquid accommodation chamber  180  for accommodating ink in an inner portion formed by the first to sixth walls  100   a  to  100   f  ( FIG. 3A ). 
     The first wall  100   a  forms the side of the liquid accommodation chamber  180  facing downward (along the negative Z axis with respect to the liquid accommodation chamber  180 ). The second wall  100   b  faces in the direction of the positive X axis, the third wall  100   c  faces in the negative X axis direction, the fourth wall  100   d  faces in the positive Z axis positive direction side, the fifth wall  100   e  faces in the positive Y axis direction, and the sixth wall  100   f  is a wall of a Y axis negative direction side, each with respect to the liquid accommodation chamber  180 . The height of the cartridge  10  extends in the direction of the Z axis, the length of cartridge  10  extends in the direction of the X axis, and the width extends in the direction of the Y axis. Herein, the concept is to use “the wall” having a predetermined thickness. 
     Both the inner surface and the outer surface of the first wall  100   a  constitute an approximately rectangular bottom surface in the mounting posture mounted on the holder  20 . The fourth wall  100   d  faces the first wall  100   a , and both the inner surface and the outer surface thereof constitute an approximately rectangular upper surface in the mounting posture. The outer surfaces of the first and fourth walls  100   a  and  100   d  become the horizontal surface in the mounting posture. 
     As shown in  FIGS. 3A to 3D , the second, third, fifth and sixth walls  100   b ,  100   c ,  100   e , and  100   f  are connected to each side (four sides) of the first and fifth walls  100   a  and  100   d , respectively. In other words, the second, third, fifth and sixth walls  100   b ,  100   c ,  100   e , and  100   f  are erected from the first wall  100   a . Among them, the third, fifth, and sixth walls  100   c ,  100   e  and  100   f  perpendicularly intersect the first and fourth walls  100   a  and  100   d . That is, the outer surfaces of each of the walls  100   c ,  100   e  and  100   f  have a vertical relationship with the horizontal surface in the mounting posture. The second wall  100   b  and the third wall  100   c  face each other, while the fifth wall  100   e  and the sixth wall  100   f  face each other. 
     As shown in  FIG. 3A , the second wall  100   b  has a first vertical wall portion  100   b   1 , an inclined wall portion  100   b   2 , and a second vertical wall portion  100   b   3 . In the mounting posture, the first vertical wall portion  100   b   1  is situated in the most vertical lower part of the portion of the second wall  100   b  and is erected vertically upward from the first wall  100   a . The second vertical wall portion  100   b   3  is situated in the most vertical upper part of the portion of the second wall  100   b  and has a vertical relationship with the fourth wall  100   d . The inclined wall portion  100   b   2  is connected to the first vertical wall portion  100   b   1  at one end portion and is connected to the second vertical wall portion  100   b   3  at the other end portion. The inclined wall portion  100   b   2  is tilted so as to cause ink near the second wall  100   b  of the liquid accommodation chamber  180  to flow toward the liquid supply port  110 . That is, the inclined wall portion  100   b   2  has an inner surface  100   b   2   a  that is tilted in a direction approaching the liquid supply port  110  from the other end portion as the upper end toward one end portion as the lower end. In addition, the outer surface of the inclined wall portion  100   b   2  is also tilted similar to the inner surface  100   b   2   a.    
     As shown in  FIG. 3A , in the first wall  100   a , a liquid supply port  110  is provided which causes ink of the liquid accommodation chamber  180  to flow toward the outside. The liquid supply port  110  is provided in a portion of the first wall  100   a  closer to the third wall  100   c  than the second wall  100   b . Herein, the expression “the closer portion” can be evaluated by comparing the lengths from the respective outer surfaces of the second and third walls  100   b  and  100   c  to the liquid supply port in regard to the length direction (X axis direction) of the cartridge  10 . The liquid supply port  110  communicates with a distribution flow path  114  formed in the first wall  100   a , and distributes ink within the liquid accommodation chamber  180  toward the outside (in the present embodiment, the print head). As shown in  FIGS. 3D and 4A , a sponge-like foam  112  is placed in the liquid supply port  110  to prevent ink from leaking out of the liquid supply port  110 . 
     As shown in  FIGS. 3A ,  3 D, and  4 A, a prism unit  170   t  is placed in the first wall  100   a , the prism unit  170   t  formed in a transparent shape from polypropylene. As shown in  FIGS. 4A to 4C , the prism unit  170   t  has a prism  170  for use in detecting a quantity of ink remaining in the liquid accommodation chamber. The prism  170  has a right angle isosceles triangular prism shape and is placed so that a reflection surface  170   f  ( FIGS. 4B and 4C ) is situated in the liquid accommodation chamber  180 . As shown in  FIG. 4A , the prism  170  is placed in contact with the inner surface of the second wall  100   b  (specifically, the first vertical wall portion  100   b   1 ). By being placed in this manner, it is possible to prevent ink flow proceeding from the second wall  100   b  to the liquid supply port  110  from being restricted by the prism  170 . As a result, the remaining quantity of ink retained in the liquid accommodation chamber  180  can be reduced as the chamber empties during use, thereby increasing efficiency of ink consumption. 
     The prism  170  differs in the reflection state of light depending on the refractive index of fluid coming into contact with the reflection surface  170   f . As shown in  FIG. 4B , when the remaining quantity of ink is reduced to the extent that the reflection surface  170   f  comes into contact with air, due to the difference between the refractive indexes between the prism  170  and air, light irradiated from the light emitting element  92  is reflected by the reflection surface  170   f  of the prism  170  and is incident to a light sensing element  94 . Meanwhile, as shown in  FIG. 4C , when ink is present within the liquid accommodation chamber  180  to the extent that the reflection surface  10   f  comes into contact with ink IK, since the refractive index of the prism  170  is about the same as that of ink, as shown in  FIG. 4C , light irradiated from the light emitting element  92  is slight refracted by the reflection surface  170   f  and proceeds to ink IK. That is, by detecting light that is incident to the light sensing element  94 , the remaining quantity of ink can be detected. 
     Furthermore, as shown in  FIGS. 3A ,  3 B and  4 A, a notch (groove)  140  is provided in the first vertical wall portion  100   b   1  of the second wall  100   b . The notch  140  is provided in a position closer to the first wall  100   a  than the terminal group  130   t . Specifically, in regard to the height direction (Z axis direction), the notch  140  is provided in a position closer to the first wall  100   a  along the Z axis direction than is the terminal group  130   t . In the present embodiment, the notch  140  is provided in a portion that becomes a bottom or lower portion of the second wall  100   b  in the mounting posture. Furthermore, as shown in  FIG. 3B , the notch  140  is provided in the approximate center of the width direction of the first vertical wall portion  100   b   1 . As mentioned above, the notch  140  is provided in the corner portion of the first wall  100   a  side of the second wall  100   b . Specifically, the notch  140  is formed is formed over two surfaces of the bottom surface and the side surface (the external surface) in the corner portion of the first wall  100   a  side of the second wall  100   b . That is, the notch  140  is formed in the shape of a groove (a concave shape) on the outer surface of the second wall  100   b  in the corner portion of the first wall  100   a  side of the second wall  100   b . More specifically, notch  140  opens toward at least the two directions of the Z axis negative direction (the first direction) and the X axis positive direction (the second direction) perpendicular to the Z axis negative direction. Herein, the Z axis negative direction is an advancement direction of the cartridge  10  upon mounting the cartridge  10  on the holder  20  that is a component of the printer  1 , and the X axis positive direction is a direction perpendicular to the advancement direction. In other words, the X axis positive direction is a direction that goes from the third wall  100   c  toward the second wall  100   b . The notch  140  at least includes an opening that opens in the direction of the negative Z axis) and is formed so as to receive the first apparatus side restriction portion  270  in the erected state, and opens in the direction of the positive X axis and is formed on the outer surface of the second wall  100   b . Furthermore, the notch  140  includes a wall constituted by the second wall  100   b  on both sides in the width direction (along the Y axis) of the cartridge  10 . 
     As shown in  FIGS. 3A and 4A , the circuit board  130  including the terminal group  130   t  (described in more detail below) is provided in the inclined wall portion  100   b   2  of the second wall  100   b . As shown in  FIG. 3A , in regard to the length direction (the X axis direction) the notch  140  is provided so as to partially overlap with the circuit board  130 . That is, in the mounting state (the mounting posture) in which the cartridge  10  is mounted on the holder  20 , the circuit board  130  is situated vertically upward the notch  140 . When the cartridge  10  is vertically projected in the vertical direction (along the Z axis), the notch  140  is provided so as to partially overlap with the circuit board  130 . In addition, regarding the length (in the X axis direction), it is desirable that the notch  140  be provided so as to overlap with a part of the terminal group  130   t  included in the circuit board  130 . Herein, the expression “the notch  140  overlaps with a part of the terminal group  130   t  included in the circuit board  130 ” means that “a containment region  800  surrounded by a minimum polygon (specifically, a convex polygon having the magnitude of all the inner angles less than 180°) including the terminal group  130   t  partially overlaps with the notch  140 . The circuit board  130  is electrically connected to the control unit  60  ( FIG. 1 ) of the printer  1  upon being mounted on the holder  20 , whereby various information (signals) is transmitted between the circuit board  130  and the printer  1 . In addition, the details of the circuit board  130  will be described further below. 
     As shown in  FIGS. 3A and 4A , the lever  120  is provided in the second wall  100   b . Specifically, the lower end surface of the lever  120  is attached to the inclined wall portion  100   b   2 . Lever  120 , which extends upward from the lower end surface, has elasticity and is elastically deformed in the length direction (the X axis direction) by external force. The lever  120  has a container side engagement portion  124  and an engagement release portion  122 . The container side engagement portion  124  is engaged with the holder  20  to restrict the movement the height direction of the cartridge  10 . Specifically, the container side engagement portion  124  restricts the movement of the height direction of the second wall  100   b  side. The engagement release portion  122  is a portion to which external force is applied by a user, and is used to release the engagement between the holder  20  and the container side engagement portion  124 . The engagement release portion  122  has a first side surface  122   t  facing the second wall  100   b , and a second side surface  122   u  opposite the first side surface  122   t . When the first side surface  122   t  comes into contact with the second wall  100   b , the second side surface  122   u  is tilted so as to approach a rotation fulcrum  166   w  described later as the second side surface  122   u  goes from the upper end to the lower end. The inclination of the second side surface  122   u  of such direction is also called a “downward inclination” below. 
     As shown in  FIGS. 3A ,  3 C and  4 A, among the portions of the third wall  100   c , in a portion occupying the height equal to or less than half in the height direction, a protrusion portion  160  is provided. The protrusion portion  160  is used so as to restrict the movement of the cartridge  10  after the cartridge  10  is mounted on the holder  20 . Specifically, the protrusion portion  160 , which has a width Wt ( FIG. 3C ), restricts the movement of the width direction and the height direction of the third wall  100   c  side of the cartridge  10  when mounted. 
     Furthermore, as shown in  FIGS. 3A and 3C , the third wall  100   c  has a rotation fulcrum  166   w  which comes into contact with the holder  20  and becomes a fulcrum of rotation upon detaching the cartridge  10  from the holder  20  by the rotation operation. The rotation fulcrum  166   w  is situated below the engagement point at which the container side engagement portion  124  is engaged with the holder  20  in regard to the height direction. In other words, the rotation fulcrum  166   w  is situated below the engagement release portion  122  in regard to the height direction. Furthermore, in the third wall  100   c , an atmosphere opening hole (not shown) for introducing air therein according to the consumption of ink of the liquid accommodation chamber  180  is formed. 
       FIGS. 5A and 5B  are diagrams for describing the circuit board  130 .  FIG. 5A  shows a configuration of the surface of the circuit board  130 .  FIG. 5B  shows a diagram in which the circuit board  130  is viewed from the side. The surface of the circuit board  130  is a surface that is exposed to the outside upon being attached to the cartridge  10 . In addition, an arrow Zt indicates an insertion direction of the cartridge  10  to the holder  20 . 
     As shown in  FIG. 5A , a boss groove  131  is formed in the upper end portion of the circuit board  130 , and a boss hole  132  is formed in the lower end portion of the circuit board  130 . The boss groove  131  and the boss hole  132  are used so as to attach the circuit board  130  to the container main body  100 . 
     The circuit board  130  includes a terminal group  130   t  including nine terminals  130   a  to  130   i  placed on the surface, and a storage portion  133 . The storage portion  133  placed on the rear surface houses information (e.g., the remaining quantity of ink or the ink color) regarding contained within the cartridge  10 . The terminals  130   a  to  130   i  are formed in an approximately rectangular shape and are placed so as to form two rows approximately perpendicular to the insertion direction Zt. Of the two rows, the row situated inside the insertion direction Zt, the underside in  FIG. 5A , is called a lower side row (a first row), and the row situated at the front side of the insertion direction Zt, upside in  FIG. 5A , is called an upper row (a second row). As mentioned above, the exterior of the containment region  800  surrounded by the minimum convex polygon including the terminal group  130   t  is shown by dashed lines. In the present embodiment, the containment region  800  is a hexagon. 
     In the central portions of each terminals  130   a  to  130   i , a contact portion cp is included which comes into contact with the corresponding terminals among the apparatus side terminals attached to the holder  20 . The respective contact portions cp of the terminals  130   a  to  130   d  forming the upper row and the respective contact portions cp of the terminals  130   e  to  130   i  forming the lower row are staggered, and constitute a so-called zigzag shape arrangement. The terminals  130   a  to  130   d  forming the upper row and the terminals  130   e  to  130   i  are also staggered so that the mutual terminal center is not aligned in the insertion direction Zt, and to constitute an arrangement of the zigzag shape. The circuit board  130  is attached to the cartridge  10  so as to have the row having the most terminals closest to the notch  140  of the cartridge  10 . That is, the circuit board  130  is attached to the cartridge  10  so that the lower row (the first row) becomes the lower position than the upper row (the second row) in the height direction of cartridge  10 . 
     The terminals  130   a  to  130   d  forming the upper row and the terminals  130   e  to  130   i  forming the lower row have the following functions (applications) as described below. 
     Upper Row 
     
         
         (1) Mounting Detection Terminal  130   a    
         (2) Reset Terminal  130   b    
         (3) Clock Terminal  130   c    
         (4) Mounting Detection Terminal  130   d  
 
Lower Row
 
         (5) Mounting Detection Terminal  130   e    
         (6) Power Source Terminal  130   f    
         (7) Ground Terminal  130   g    
         (8) Data Terminal  130   h    
         (9) Mounting Detection Terminal  130   i    
       
    
     Four mounting detection terminals  130   a ,  130   d ,  130   e , and  130   i  are used so as to detect the quality of the electrical connection between the detection terminals and the apparatus side terminals and are able to be referred to as “contact detection terminals.” The other five terminals  130   b ,  130   c ,  130   f ,  130   g , and  130   h  are terminals for the storage portion  133 . 
     A-3. Holder Configuration 
     A detailed configuration of the holder  20  is described using  FIGS. 6A to 8 .  FIGS. 6A and 6B  show details of the holder  20 .  FIG. 6A  is a first exterior perspective view of the holder  20 , and  FIG. 6B  is a second exterior perspective view of the holder  20 . In the second exterior perspective view, a part of an outer peripheral wall forming the holder  20  is omitted for ease of explanation.  FIGS. 7A and 7B  are diagrams for describing a detailed configuration of an apparatus side opposed wall  25   c .  FIG. 7A  is a diagram in which the apparatus side opposed wall  25   c  is viewed from the X axis positive direction side.  FIG. 7B  is a partially enlarged view of  FIG. 7A .  FIG. 8  is a cross-sectional view taken from lines VIII-VIII of  FIG. 6A . In the cross-sectional view of  FIG. 8 , the vicinity of the liquid supply pipe  240  is simplified for ease of explanation. 
     As shown in  FIGS. 6A , the holder  20  has a concave shape in which a portion is opened so as to permit the cartridge  10  to be attached or detached. The holder  20  has an apparatus side bottom wall (also referred to as a “bottom surface”)  25   a , an apparatus side wall (“the front”)  25   b , an apparatus side opposed wall (also referred to as a “back”)  25   c , a first apparatus side wall (also referred to as a “left side”)  25   e , and a second apparatus side wall (also referred to as a “right side”)  25   f . A cartridge accommodation chamber  220  as a container accommodation portion accommodating the cartridge  10  is formed by the walls  25   a ,  25   b ,  25   c ,  25   e , and  25   f . The respective walls  25   a ,  25   b ,  25   c ,  25   e , and  25   f  are formed of synthetic resin such as polypropylene. 
     The apparatus side bottom wall  25   a  constitutes the bottom surface in the usage posture of the printer  1 . The apparatus side opposed wall  25   c , the apparatus side engagement wall  25   b , the first apparatus side wall  25   e , and the second apparatus side wall  25   f  are erected from the apparatus side bottom wall  25   a . The apparatus side opposed wall  25   c  and the apparatus side engagement wall  25   b  have an opposing relationship, and the first apparatus side wall  25   e  and the second apparatus side wall  25   f  have an opposing relationship. 
     A liquid supply pipe  240  and a seal member  242  are attached to the apparatus side bottom wall  25   a , and an end side of the liquid supply pipe  240  is connected to a print head  21  ( FIG. 8 ) that is attached to the rear surface (the surface in the negative Z axis direction) of the apparatus side bottom wall  25   a . Furthermore, when the cartridge  10  is mounted on the holder  20 , the other end side of the liquid supply pipe  240  is connected to the liquid supply port  110  ( FIG. 3A ) of the cartridge  10 . The seal member  242  is a member having elasticity such as synthetic rubber. The seal member  242  is placed around the liquid supply pipe  240 , and prevents ink from leaking to the outside when the cartridge  10  is mounted on the holder  20 . Furthermore, as shown in  FIG. 8 , on the other side of the liquid supply pipe  240 , a porous metallic filter  240   t  is provided which partially comes into contact with the foam  112  ( FIG. 4A ) within the liquid supply port  110 . For the filter  240   t , a stainless mesh or a stainless nonwoven fabric can be used. Optionally, the filter  240   t  can be omitted. 
     As shown in  FIG. 6B , in the apparatus side bottom wall  25   a , four through holes  290  (only three of them are shown in  FIG. 6B ) and four first apparatus side restriction portions  270  (only three of them are shown in  FIG. 6B ) are provided corresponding to the number (four) of cartridges  10  to be mounted. In the apparatus side bottom wall  25   a , four contact mechanisms  280  (only three of them are shown in  FIG. 6B ), are positioned so as to correspond to the number of the cartridge  10  to be mounted. 
     The through hole  290  is used in the detection of the remaining quantity of ink within the cartridge  10  using the optical detection device  90  provided on the Z axis negative direction side of the holder  20 . Specifically, the through hole  290  allows for passage of light emitted from the optical detection device  90  to therethrough as well as light reflected from the cartridge  10 . 
     Typically, the shape of the first apparatus side restriction portion  270  is a protrusion shape, and the first apparatus side restriction portion  270  has a pointed shape as it goes upward. The first apparatus side restriction portion  270  of the cartridge  10  is inserted within the notch  140  so as to restrict movement of the cartridge  10  in the width direction (the Y axis direction). In addition, the first apparatus side restriction portion  270  is also called a restriction pin  270 . The restriction pin  270  may be integrally formed with the holder  20  as in the present embodiment and may be attached to the apparatus side bottom  25   a  as a separate member. 
     The contact mechanism  280  is used for electrically connecting the circuit board  130  of the cartridge  10  with the control unit  60  of the printer  1 . The contact mechanism  280  has a plurality of electric contact members (also called “terminals”)  280   a  to  280   i  for electrically connecting with the terminals  130   a  to  130   i  of the circuit board  130 . Typically, the number of the electric contact members  280   a  to  280   i  corresponds to the number of the terminals  130   a  to  130   i  ( FIG. 5A ) of the circuit board  130  and is nine in the present embodiment, the contact mechanism  280  being electrically connected to the control unit  60 . 
     The apparatus side engagement wall  25   b  has an apparatus side engagement portion  260  that is horizontally extended in the usage posture of the printer  1 . The apparatus side engagement portion  260  has a flat plate shape and is held in a predetermined height position from the apparatus side bottom wall  25   a . The apparatus side engagement portion  260  is engaged with the container side engagement portion  124  ( FIG. 3A ) of the cartridge  10  and restricts the movement of the cartridge  10  in the height direction after the cartridge  10  is mounted. 
     As shown in  FIG. 7A , the apparatus side opposed wall  25   c  includes an upright wall surface  216 , a guide groove  200   t , and a hole portion  202  formed in the upright wall portion  216 . In the usage posture, the upright wall portion  216  is extended upward (the Z axis positive direction) from the apparatus side bottom wall  25   a . The upright wall portion  216  has an opposed surface  216   u , an extension surface  216   t  and an upper surface  216   s  from the lower part in order. In the usage posture, the opposed surface  216   u  is extended vertically upward from the apparatus side bottom wall  25   a . In other words, the opposed surface  216   u  forms a surface that is approximately parallel to the outer surface of the third wall  100   c  ( FIG. 3A ) of the cartridge  10  in the mounting state in which the cartridge  10  is mounted on the holder  20 . In order to facilitate understanding, the opposed surface  216   u  is illustrated with a single line hatching. 
     The extension surface  216   t  is extended from the upper end of the opposed surface  216   u  toward the outside (exterior) of the holder  20 . In other words, in the mounting state, the extension surface  216   t  is extended in a direction away from the outer surface of the third wall  100   c  ( FIG. 3A ) of the cartridge  10 . In the present embodiment, the extension surface  216   t  constitutes an inclined surface that is tilted with respect to the vertical direction. Furthermore, the apparatus side opposed wall  25   c  has a rotation fulcrum  216   w  corresponding to the rotation fulcrum  166   w  of the cartridge  10 . The rotation fulcrum  216   w  is defined by the boundary between the opposed surface  216   u  and the extension surface  216   t . The rotation fulcrum  216   w  is also called an upper end of the opposed surface  216   u.    
     The upper surface  216   s  is extended upward from the lower end of the extension surface  216   t  in the usage posture of the printer  1 . Similar to the extension surface  216   t , the upper surface  216   s  is inclined with respect to the vertical direction. 
     As shown in  FIG. 8 , by forming the opposed surface  216   u , the extension surface  216   t  and the upper surface  216   s , a space portion  216   sp  is formed which can receive a part of the cartridge  10  when separating the cartridge  10  while being rotated. 
     In regard to  FIGS. 7A and 7B , the protrusion portion  160  ( FIG. 3A ) of the cartridge  10  is inserted into the approximately rectangular hole portion  202 . As a result, the movement of the cartridge  10  in the width direction (the Y axis direction) and the height direction (the Z axis direction) in the mounting state is restricted within a predetermined range. In addition, the width Wb of the hole portion  202  is approximately the same as the width Wt of the protrusion portion  160  of the cartridge  10 . Since the attachment or detachment operation of the cartridge  10  to or from the holder  20  is performed by the rotation operation described later, a gap of the height direction between the hole portion  202  of the holder  20  and the protrusion portion  160  ( FIG. 3C ) of the cartridge  10  in the mounting state is greater than the gap of the width direction. 
     The guide groove  200   t  guides the protrusion portion  160  to the hole portion  202  while restricting the movement of the cartridge  10  in the width direction when the cartridge  10  is mounted on the holder  20 . As shown in  FIG. 7B , the guide groove  200   t  is formed over the hole portion  202  from the upper end of the apparatus side opposed wall  25   c . In addition, in order to facilitate understanding, in  FIG. 7B , the hole portion  202  is illustrated with single line hatching. By providing the guide groove  200   t , since there is no need to provide another member for positioning the cartridge  10  (e.g., a partition wall) in the holder  20 , the holder  20  can be reduced in size. In addition, the upper end of the guide groove  200   t  does not need to be situated in the upper end of the apparatus side opposed wall  25   c  but may be situated in the middle portion of the apparatus side opposed wall  25   c  in the height direction. 
     The width Wa of the upper end  200   ta  of the guide groove  200   t  is greater than the width Wb of the lower end  200   tb . The lower end  200   tb  has the same width as that of the hole portion  202 , and the width Wa of the upper end  200   ta  is greater than the width Wt ( FIG. 3C ) of the protrusion portion  160  of the cartridge  10 . Furthermore, the width of the guide groove  200   t  is monotonically reduced as it approaches from the upper end  200   ta  to the lower end  200   tb  (that is, the hole portion  202 ). Herein, the expression “monotonically reduced” may include the portion of the constant width if a portion having the increased width is not included as approaching from the upper end  200   ta  to the lower end  200   tb . More specifically, the guide groove  200   t  has a tapered lower guide groove  200   tu  in which the width is gradually reduced as it approaches the hole portion  202 . In addition, the boundary between the lower guide groove  200   tu  and other portions is added with dashed lines. 
     As shown in  FIGS. 7A and 8 , the apparatus side opposed wall  25   c  has a deformation portion  212  that can be elastically deformed in the depth direction (the X axis direction, a direction in which the apparatus side engagement portion  260  and the apparatus side opposed wall  25   c  face each other) of the guide groove  200   t . In other words, the deformation portion  212  is configured so as to be elastically deformable toward the outside (the exterior, the X axis negative direction) of the cartridge accommodation chamber  220  to receive cartridge  10 . The deformation portion  212  is formed by applying the notch  214  at both ends (both sides) of the groove bottom wall  213  constituting the bottom surface of the guide groove  200   t . The notch  214  passes through the groove bottom wall  213 . The deformation portion  212  is extended from the portion coming into contact with the hole portion  202  of the portions of the groove bottom wall  213  to a height equal to or greater than a predetermined height. The predetermined height indicates a portion that is situated in a position higher than an intersection point in which rotation trace of the protrusion portion  160  ( FIG. 4A ) in the case of mounting the cartridge  10  by a predetermined method intersects the groove bottom wall  213 . 
     A-4. Attachment of Cartridge 
       FIGS. 9A and 9B  illustrate attachment of the cartridge  10  to holder  20 , before and after attachment, respectively.  FIGS. 9A and 9B  are side views of cross-section IX-IX of the cartridge  10  of  FIG. 3B  and of the holder  20  corresponding to the cross-section IX-IX. A mounting method (a normal mounting method) commonly adopted when a user mounts the cartridge  10  on the holder  20  will be described in further detail below. 
     As shown in  FIG. 9A , in the normal mounting method, the cartridge  10  is tilted so that the protrusion portion  160  of the third wall  100   c  comes into contact with the apparatus side opposed wall  25   c , and the cartridge  10  is mounted on the holder  20 . Specifically, the cartridge  10  is moved vertically downward shown by arrow Zw while inserting the protrusion portion  160  into the guide groove  200   t . At this time, since the width Wa of the upper end of the guide groove  200   t  is greater than the width Wt of the protrusion portion  160  of the cartridge  10 , the protrusion portion  160  can be easily inserted into the guide groove  200   t.    
     As shown in  FIG. 9B , when the protrusion portion  160  of the cartridge  10  is moved to a position adjacent the deformation portion  212  and external force is applied by protrusion portion  160 , the deformation portion  212  is elastically deformed outward (in the direction of the negative X axis direction). In this manner, the deformation portion  212  is elastically deformed, such that the cartridge  10  can be smoothly mounted on the holder  20 . 
       FIGS. 10A and 10B  are additional views depicting attachment of the cartridge to the holder. Similar to  FIGS. 9A and 9B ,  FIG. 10A  shows a cross sectional view taken from lines XA-XA of the cartridge  10  of  FIG. 3B  and a cross-sectional view of holder  20  corresponding to the cross sectional view taken from lines XA-XA. Furthermore,  FIG. 10B  is a perspective view near the restriction pin  270  of  FIG. 10A . 
     As shown in  FIG. 10A , when the cartridge  10  is further moved vertically downward, the protrusion portion  160  is guided to the guide groove  200   t  and is inserted into the hole portion  202 . In this state, the container side engagement portion  124  of the cartridge  10  is not engaged with the apparatus side engagement portion  260  of the holder  20 . 
     When the protrusion portion  160  is inserted into the hole portion  202 , as shown in  FIG. 10B , the restriction pin  270  of the holder  20  is inserted into the notch  140  of the cartridge  10 . By pushing down the second wall  100   b  side vertically downward in this state, the container side engagement portion  124  is engaged with the apparatus side engagement portion  260 . During push-down operation, since the movement of the second wall  100   b  with the circuit board  130  attached thereto in the width direction is restricted, it is possible to accurately perform the positioning of the cartridge  10  relative to the holder  20 . That is, it is possible to reduce the possibility of the respective terminals  130   a  to  130   i  ( FIGS. 5A and 5B ) of the circuit board  130  of the cartridge  10  after the mounting not coming into contact with the apparatus side terminal  280   t  (although there are nine terminals, it is collectively referred to as apparatus side terminal  280   t ) of the contact mechanism  280 . Furthermore, since the notch  140  is provided in a position closer to the first wall  100   a  than the circuit board  130 , when mounting the cartridge  10  on the holder  20 , the restriction pin  270  is inserted into the notch  140  of the cartridge  10  before the respective terminals  130   a  to  130   i  of the circuit board  130  come into contact with the apparatus side terminal  280   t  of the contact mechanism  280 , that is, in the state in which the restriction pin  270  is inserted into the notch  140  and the movement of the cartridge  10  in the width direction (the Y axis direction) is restricted to some degree, the respective terminals  130   a  to  130   i  of the circuit board  130 . Thus, it is possible to more reliably cause the respective terminals  130   a  to  130   i  to come into contact with the contact mechanism  280  upon mounting the cartridge  10  on holder  20 . 
     As mentioned above, since the guide groove  200   t  is formed in the apparatus side opposed wall  25   c , the protrusion portion  160  can be more easily guided to the hole portion  202 . In particular, since the guide groove  200   t  has the lower guide groove  200   tu , the protrusion portion  160  can be more smoothly guided to the hole portion  202 . 
       FIGS. 11A and 11B  are drawing illustrating the state of the cartridge after mounting in the holder. Similar to  FIGS. 9A and 9B ,  FIG. 11A  shows a cross-sectional view taken from lines XIA-XIA of the cartridge  10  of  FIG. 3B  and a cross-sectional view of holder  20  taken from lines XIA-XIA.  FIG. 11B  is a perspective view of the mounting state (the mounting posture).  FIG. 11A  shows ink in the liquid accommodation chamber  180  illustrated by dots. 
     As shown in  FIG. 11A , in the mounting state, the container side engagement portion  124  is engaged with the apparatus side engagement portion  260  such that the movement of the cartridge  10  in the height direction is restricted. In regard to the vertical direction (along the Z axis) in the usage posture of the holder  20  (the printer  1 ), the rotation fulcrum  216   w  is situated below the engagement point  124   t . In the mounting state, the lever  120  is engaged with the apparatus side engagement portion  260  in the state closer to the second wall  100   b  than a non-load state. Thus, the lever  120  presses the container main body  100  against the apparatus side opposed wall  25   c  side so that movement of the cartridge  10  in the length direction (along the X axis) is restricted. In the mounting state, the liquid supply pipe  240  is connected to the liquid supply port  110 , and each terminal of the circuit board  130  comes into contact with the respective corresponding electric contact members  280   a  to  280   i  of the contact mechanism  280 . Through the circuit board  130 , various information such as ink color or remaining quantity information of ink is transmitted between the cartridge  10  and the control unit  60  ( FIG. 1 ) of the printer  1 . In the mounting state, ink is supplied to the print head  21  via the liquid supply port  110  and the liquid supply pipe  240  by the absorption from the print head  21 . To detect the quantity of ink remaining within the chamber, the optical detection device  90  is used at a predetermined timing. 
     In the mounting state, the restriction pin  270  cooperates with the notch  140  to restrict the movement of the second wall  100   b  side in the width direction. The hole portion  202  cooperates with the protrusion portion  160  to restrict the movement of the third wall  100   c  side in the width direction (the Y axis direction) and the height direction (the Z axis direction). The apparatus side engagement portion  260  cooperates with the container side engagement portion  124  to restrict the movement of the second wall  100   b  side in the height direction. The restriction of the movement of the second wall  100   b  side in the width direction due to the cooperation of the restriction pin  270  with the notch  140  is not premised on other restrictions. 
     Upon performing printing, the holder  20  and the cartridge  10  are moved in the main scanning direction (in the Y axis direction along the width direction of the cartridge  10 ). That is, the cartridge  10  is subjected to an external force (inertial force) in the width direction, as shown in  FIG. 11B . The cartridge  10  is rotated in the rotation direction including the width direction component around the liquid supply port  110  ( FIG. 11A ). Specifically, the second wall  100   b  side portion is rotated in a direction of an arrow YR 1 , and the third wall  100   c  side portion is rotated in a direction of an arrow YR 2 . There is also a possibility that the cartridge  10  is rotated in a direction of an arrow YR 3  by being subjected to the external force. The directions of the arrow YR 1  and the arrow YR 2  are rotational directions including the rotation in the Y direction (the width direction) about the Z axis, and the arrow YR 3  is a rotation direction including rotation in the Y direction (the width direction) about the X axis. Herein, the circuit board  130  is provided in the second wall  100   b . Thus, by providing the notch  140  for restricting the movement of the width direction in the second wall  100   b , it is possible to further suppress movement (the deviation) of the circuit board  130  relative to the holder  20 , as compared to a case of providing the notch  140  in the first wall  100   a . As a result, it is possible to satisfactorily maintain the electric connection between the circuit board  130  (specifically, the terminal group  130   t ) and the printer  1  after the mounting. In the present embodiment, as mentioned above, the circuit board  130  is placed so as to partially overlap with the notch  140  in regard to the length direction ( FIG. 3A ). This aspect suppresses or minimizes movement (the deviation) of the circuit board  130  (including the terminal group  130   t ) relative to the holder  20 . In addition, it is desirable that the notch  140  be provided so as to overlap with a part of the terminal group  130   t  included in the circuit board  130  in regard to the length direction (the X axis direction). In this manner, it is possible to further suppress and minimize movement (the deviation) of the terminal group  130   t  relative to the holder  20 . 
     Herein, the inertial force caused by the movement in the main scanning direction was described as the external force of the width direction received by the cartridge  10 , the external force received by the cartridge  10  is not limited thereto. For example, in a type referred to as an off-carriage printer in which only the print head is moved in the main scanning direction and the cartridge  10  is not moved in the main scanning direction, in some cases, the cartridge  10  is also subjected to the external force in the width direction. Specifically, in the off-carriage type printer, in some cases, the cartridge  10  is subjected to the vibration or the like generated from the movement of the print head in the main scanning direction or the like, and external force (inertial force) acts in the width direction of the cartridge  10 . 
     Furthermore, in the case of providing the groove for restricting the movement of the width direction in the first wall  100   a  (the bottom surface), there is a need for a member for forming (defining) the groove. In the present embodiment, since the notch  140  restricting the movement in the width direction of the second wall  100   b  is provided, the size of the cartridge  10  in the length direction (along the X axis) can be reduced. Furthermore, notch  140  is provided in the corner portion of the first wall  100   b  side of the second wall portion  100   b  and opens in the direction of the negative Z axis (the first direction) and the X axis positive direction (the second direction) perpendicular to the Z axis negative direction ( FIGS. 3A to 3D ), thereby allowing the number of walls defining the notch  140  to be reduced when compared to a case where only an opening for receiving the first apparatus side restriction portion  270  of the holder  20  is formed. Thus, when mounting the cartridge  10  on the holder  20 , it is possible to reduce the possibility of the wall defining the notch  140  interfering (colliding) with the first apparatus side restriction portion  270 . As a result, it is possible to raise a degree of freedom or range of acceptable insertion angles of the cartridge  10  to the holder  20  when mounting the cartridge  10  on the holder  20 , thereby improving ease of use during attachment. 
     Furthermore, the notch  140  can suppress the movement of the prism  170  in the width direction when engaged with the restriction pin  270 . Particularly, in the present embodiment, the prism  170  is placed in contact with the inner surface of the second wall  100   b  formed with the notch  140  ( FIG. 4A ). As a result, it is possible to suppress the movement (the deviation) of the prism  170  in the width direction to the minimum to allow for more accurate determination of the remaining quantity of ink. Also, this placement reduces the possibility of interference of the flow of ink toward the liquid supply port  110  by the prism  170 , thereby allowing for more effective consumption of ink within the liquid accommodation chamber  180  by reducing the remaining quantity of unused ink. 
     By forming the first restriction portion as the notch  140 , it is possible to reduce the possibility of the first restriction portion (the notch  140 ) interfering with the holder  20  upon attaching or detaching the cartridge  10  to or from the holder  20 , as compared to a case of forming the first restriction portion as a protrusion shape (in this case, the first apparatus side restriction portion  270  enters a concave state). As result, it is possible to suppress an occurrence of the disadvantage of the cartridge  10  or the holder  20  being damaged or the like. 
     In this manner, since the cartridge  10  has the notch  140  for restricting the movement of the width direction in the second wall  100   b  with the circuit board  130  mounted thereon, the deviation of the circuit board  130  relative to the holder  20  can be suppressed. Thus, it is possible to reduce the possibility of the electric connection between the circuit board  130  and the printer  1  being blocked. Since the deviation of the circuit board  130  relative to the holder  20  can be suppressed, a plurality of terminals can be provided by the circuit board  130 . As a result, it is possible to perform the transmission of more information between the circuit board  130  and the printer  1 . 
     A-5. Detachment of Cartridge 
       FIGS. 12A and 12B  are drawings depicting detachment of the cartridge  10  is detached from the holder  20 .  FIG. 12A  shows the detaching situation, and  FIG. 12B  shows a detail of one of the effects of detachment.  FIG. 12A  is a cross-sectional view taken from lines XIIA-XIIA of the cartridge  10  of  FIG. 3B  and a cross-section of the holder  20  corresponding to the cross-sectional view taken from lines XIIA-XIIA. 
     As shown in  FIG. 12A , when detaching the cartridge  10  from the holder  20 , the engagement release portion  122  is elastically deformed in a direction (the X axis negative direction, a direction in which the engagement is released) approaching (pressing) the container main body  100  (specifically, the second wall  100   b ). The engagement between the apparatus side engagement portion  260  and the container side engagement portion  124  is then released. In other words, the engagement is released by applying the external force to the engagement release portion  122  in a direction (the X axis negative direction) from the apparatus side engagement wall  25   b  toward the apparatus side opposed wall  25   c . The engagement release portion  122  is formed so that the second side surface  122   u  is tilted by a predetermined angle θ from the vertical direction when the first side surface  122   t  comes into contact with the second wall  100   b . The engagement release portion  122  is formed such that applying the external force F to the engagement release portion  122  in the direction of the negative X axis releases engagement allowing the cartridge  10  to be effectively detached from the holder  20 . This reasoning will also be described using  FIG. 12B . 
     As shown in  FIG. 12B , a case will be considered where the external force F is applied to the engagement release portion  122  in a direction (the X axis negative direction) in which the engagement release portion  122  approaches the container main body  100  (specifically, the second wall  100   b ) so as to release the engagement. The external force F can be resolved into force F 1  of the tangential direction component of circumference around the rotation fulcrum  216   w  and a radial direction component F 2 . When the second side surface  122   u  is tilted (inclined downward) so as to be close to the rotation fulcrum  216   w  as the second side surface  122   u  goes from the upper end to the lower end, the force F 1  of the tangential direction component can be effectively transmitted to the engagement release portion  122 . Thus, in the case of applying the external force to the engagement release portion  122  in a direction (the negative X axis direction) in which the engagement between the container side engagement portion  124  and the apparatus side engagement portion  260  is released, the engagement is released, and it is possible to easily rotate the cartridge  10  in a direction (the arrow Rd) in which the cartridge  10  is detached. 
       FIGS. 13A and 13B  show the situation in which the cartridge  10  is detached from the holder  20 .  FIG. 13A  shows the situation in which the cartridge  10  is rotated by the use of the rotation fulcrum  126   w  as a fulcrum.  FIG. 13B  shows the situation in which the cartridge  10  is rotated by the use of the rotation fulcrum  216   w  as a fulcrum. In addition,  FIGS. 13A and 13B  show the cross-sectional view taken from lines XIII-XIII of the cartridge  10  of  FIG. 3B  and the cross-section of the holder  20  corresponding to the cross-sectional view taken from lines XIII-XIII. 
     As shown in  FIG. 13A , when the external force F of a predetermined direction component (the X axis negative direction component) is applied to the engagement release portion  122 , the cartridge  10  is subjected to a rotation movement using the rotation fulcrum  216   w  as a fulcrum in the arrow Rd direction, which includes an upward component. Since the space portion  216   sp  is situated above the rotation fulcrum  216   w , the rotational movement of the cartridge  10  in a predetermined direction is not inhibited by the holder  20 . 
     As shown in  FIG. 13B , when the rotation movement of the predetermined direction progresses, the third wall  100   c  of the cartridge  10  comes into contact with the upper surface  216   s . In this state, the upper surface  216   s  becomes a barrier, whereby the rotation direction of a predetermined direction is inhibited. However, in this state, the second wall  100   b  side is lifted vertically upward in relation to the holder  20 , to the extent that a user can easily pick up the second wall  100   b  side of the cartridge  10 . 
     As mentioned above, the cartridge  10  is configured so that the rotation fulcrum  166   w  is situated below the engagement point  124   t  and the engagement release portion  122  is situated over the engagement point  124   t  ( FIG. 11A ). As shown in  FIG. 12A , by applying the external force to the engagement release portion  122  in a predetermined direction (the X axis negative direction), it is possible to easily detach the cartridge  10  from the holder  20  by use of the rotation fulcrum  216   w . That is, it is possible to perform an operation of releasing the engagement between the container side engagement portion  124  with the apparatus side engagement portion  260  and an operation of detaching the cartridge  10  from the holder  20  by a series of operations ( FIGS. 12A to 13B ), thereby providing a user with a holder  20  and ink cartridge  10  having improved operability of attachment. Furthermore, the rotation fulcrum  216   w  of the holder  20  can be easily defined by the opposed surface  216   u  and the extension surface  216   t  of the apparatus side opposed wall  25   c.    
     A-6. Attachment of Cartridge by Another Method 
       FIGS. 14A to 14C  are cross-sectional views depicting an alternative mounting method. Time series are shown in the order of  FIGS. 14A to 14C . Furthermore,  FIGS. 14A to 14C  are diagrams that show the cross-sectional view taken from lines XIV-XIV of the cartridge  10  of  FIG. 3B  and the cross-section of the holder  20  corresponding to the cross-sectional view taken from lines XIV-XIV. A mounting method (an engagement mounting method) of inclining the cartridge  10  so that the second wall  100   b  becomes the vertical portion lower than the third wall  100   c  when inserting the cartridge  10  into the holder  20  will be described using  FIGS. 14A to 14C . 
     As shown in  FIG. 14A , in the engagement mounting method, before the protrusion portion  160  is inserted into the hole portion  202 , the container side engagement portion  124  is engaged with the apparatus side engagement portion  260 . In this case, by rotating the cartridge  10  using the engagement point  124   t  as the rotation fulcrum, the cartridge  10  is mounted on the holder  20 . At this time, the protrusion portion  160  draws a rotation trace Rm. The rotation trace Rm intersects the deformation portion  212 , the deformation portion  212  situated at a point where the Rm intersects holder  20 . In the usage posture, the deformation portion  212  is formed so as to reach a position higher than the intersection point Rx where the rotation trace Rm intersects the groove bottom wall  213 . As shown in  FIG. 14A , immediately after the protrusion portion  160  comes into contact with the groove bottom wall  213 , the protrusion portion  160  abuts against the deformation portion  212 . 
     As shown in  FIG. 14B , when the third wall  100   c  side is pushed down vertically downward, the deformation portion  212  is pushed to the outside direction (in the direction of the negative X axis) of the holder  20  by the protrusion portion  160  and is elastically deformed. Due to the elastic deformation of the deformation portion  212 , the third wall  100   c  side can be pushed down vertically downward so that the movement of the cartridge  10  is not limited. As a result, as shown in  FIG. 14C , the cartridge  10  can be mounted on the holder  20 . 
       FIGS. 15A and 15B  depict an alternative method of mounting a cartridge  10  to a holder  20 .  FIGS. 15A and 15B  show cross-sectional views taken from lines XV-XV of the cartridge  10  of  FIG. 3B  and from lines XV-XV of the holder  20 , respectively. 
       FIG. 15A  shows a mounting method (an upward access mounting method) of mounting the cartridge  10  on the holder inserted immediately over the holder  20  without inclining the cartridge  10 . Even in such a mounting method, since the deformation portion  212  can be elastically deformed, the holder  20  can be mounted on the cartridge  10  so that the movement of the cartridge  10  is not limited. 
       FIG. 15B  shows a mounting method (a front access mounting method) of mounting the cartridge  10  on the holder  20  without inserting the protrusion portion  160  into the guide groove  200   t . In the present embodiment, since the deformation portion  212  of holder  20  reduces the possibility of the movement of the cartridge  10  being limited and not being able to be mounted to the holder  20 , there is no need to provide a member for preventing the mounting by a specific mounting method (a mounting method in which the movement is limited) in the opening of the holder  20 . 
     As mentioned above, since the holder  20  has deformation portion  212 , the movement of the cartridge  10  can be limited within the holder  20  before the cartridge  10  is mounted on the holder  20 . As a result, since there is no need to provide a mechanism preventing a specific mounting method in the opening of the holder  20  thereby improving operability in attaching the cartridge  10  to the holder  20  while promoting a reduction in the number of components of the holder  20  and still allowing use of different mounting methods. 
     B. Second Embodiment 
       FIGS. 16A and 16B  show a cartridge  10   a  of an alternative embodiment.  FIG. 16A  is a cross-sectional view of a cartridge  10   c  from lines XVIA-XVIA of  FIG. 3B , and  FIG. 16B  shows prisms  170   a  to  170   c  of cartridge  10   a . In addition, the second embodiment is different from the first embodiment in the configurations of the prisms  170   a  to  170   c , and other configurations are the same as those of the first embodiment. Thus, the same configurations are denoted by the same reference numerals and the descriptions thereof will be omitted. Furthermore, the configuration of the holder  20  to be mounted with the cartridge  10   a  and the configuration of the printer  1  are the same as those of the first embodiment. 
     As shown in  FIG. 16A , first, second and third prisms  170   a  to  170   c  are provided in the first wall  100   a . The respective prisms  170   a  to  170   c  include portions of right angle isosceles triangular prism shapes including the reflection surface  170   f . Furthermore, distances between the reflection surfaces of the respective prisms  170   a  to  170   c  and the first wall  100   a  are different from each other, respectively. In an exemplary embodiment, the distance between the reflection surface and the first wall  100   a  is a length of the prism positioned closest the notch  140 . Preferably, the prism having the greatest distance  170   a  is placed in contact with the inner surface of the second wall  100   b  provided with the notch  140 , and the prisms are placed further from the second wall  100   b  in order of decreasing distance. In this manner, by arranging the first to third prisms  170   a  to  170   c , a distance between the reflection surface  170   f  and an optical detection device (not shown) along the Z-axis becomes greater nearest notch  140 . In addition, the optical detection device may be placed in the printer  1  so as to correspond to the number of the prism to detect the remaining quantity, and may be moved immediately under the respective prisms  170   a  to  170   c  to detect the remaining quantity. 
     In this manner, by arranging the plurality of prisms  170   a  to  170   c  having different heights of the reflection surface  170   f , the remaining quantity of ink of the cartridge  10   a  can be more specifically detected. Furthermore, as the distance between the optical detection device and the reflection surface  170   f  becomes longer, the deviation of the relative positions between the reflection surface  170   f  and the optical detection device is generated, thereby the detection accuracy of the remaining quantity of ink tends to decrease. In the present embodiment, the prisms are placed so as to be closer to the notch  140  so that the deviation relative to the holder  20  can be further suppressed to the extent of the prism  170   a  in which the distance between the optical detection device and the reflection surface  170   f  is relatively large. Thus, it is possible to reduce the irregularity of the detection accuracy of the remaining quantity of ink using the respective prisms  170   a  to  170   c . Also, since the cartridge  10   a  of the second embodiment has the notch  140  like the first embodiment, the cartridge  10   a  can cooperate with the restriction pin  270  of the holder  20  to restrict the movement in the width direction (the Y axis direction) so as to satisfactorily maintain the electrical connection between the circuit board  130  (specifically, the terminal group  130   t ) and the printer  1 . 
     C. MODIFIED EXAMPLE 
     Elements other than those of the independent aspect of the claimed invention and embodiments described above are additional elements that can be suitably omitted. Additionally, the invention is not limited to the embodiments mentioned above but can be carried out in various forms without departing from the scope and spirit of the invention, such that additional modification, such as those presented below, are also possible. 
     C-1. First Modified Example 
     In the embodiments mentioned above, although the prisms  170  and  170   a  are placed in contact with the inner surface of the second wall  100   b  ( FIG. 4A  and  FIG. 16A ), the prisms  170  and  170   a  may be placed separately from the second wall  100   b  without being limited thereto. Even in such cases, the movement (the deviation) of the circuit board  130  relative to the holder  20  is suppressed and it is preferable to adopt the modified form as below.  FIGS. 17A to 17E  show modified forms of the first modified example depicting the vicinity of the prism  170 . The first modified example is different from the first embodiment in that the prism  170  is disposed separately from the inner surface of the first vertical wall portion  100   b   1  and protrusion-like members  175   a  to  175   e  are provided between the prism  170  and the first vertical wall portion  100   b   1 . Since other configurations are the same as those of the first embodiment, the same configurations are denoted by the same reference numerals and the descriptions thereof are omitted. 
     The protrusion-like members  175   a  to  175   e  are protrusions extending from the first wall  100   a  toward the inner portion of the liquid accommodation chamber  180 , the shapes adopting a rectangular shape ( FIG. 17A , reference numeral  175   a ), a triangular prism shape ( FIGS. 17B to 17E , reference numerals  175   b  to  175   e ) or the like. In some embodiments, the protrusion-like members  175   a ,  175   b  and  175   e  are placed in contact with both the prism  170  and the first vertical wall portion  100   b   1 . In this manner, by having the protrusion-like members  175   a  to  175   e , it is possible to prevent ink being restrained by the prism  170  so that ink of the first vertical wall portion  100   b   1  side is guided to the liquid supply port  110  ( FIG. 4A ) so as to more effectively consume ink within the liquid accommodation chamber  180  ( FIG. 4A ). 
     C-2. Second Modified Example 
     In the embodiments mentioned above, although the cartridges  10  and  10   a  used the prisms  170 ,  170   a  to  170   c  to detect the remaining quantity of ink ( FIG. 4A  and  FIG. 16A ), such prisms can optionally be omitted. Instead of using prisms, the quantity of ink can be detected using a piezoelectric element or a sensor with an electrode. Even in such embodiments, the notches  140  of the cartridges  10  and  10   a  cooperate with the restriction pin  270  of the holder  20 , to suppress undesired movement (the deviation) of the circuit board  130  relative to the holder  20 . As in the embodiments mentioned above, operability of attaching or detaching the cartridges  10  and  10   a  to or from the holder  20  can be improved by the rotation fulcrum  166   w ,  216   w  or the deformation portion  212  of the holder  20 . 
     C-3. Third Modified Example 
     In the embodiments mentioned above, although a notch  140  was used as the first restriction portions of the cartridges  10  and  10   a , the shapes of the restriction portion are not so limited. For example, the protrusions as the first restriction portions may be provided in the second wall  100   b . In this case, in the holder  20 , a concave portion is provided into which the protrusion is inserted instead of the restriction pin  270 . Even in such cases, since the movement of the cartridges  10  and  10   a  in the width direction is suppressed after mounting, the electric connection between the circuit board  130  and the printer  1  is satisfactorily maintained. Furthermore, although the notch  140  is described as being provided in approximate center of the width direction of the first vertical wall portion  100   b   1  ( FIG. 3B ), the invention is not so limited. For example, the notch  140  may be formed in one end of the width direction of the first vertical wall portion  100   b   1 . That is, in the notch  140  of the embodiment mentioned above, both sides of the width direction may be formed by the first vertical wall portion  100   b   1 , but only one side may be formed by the first vertical wall portion  100   b   1  while the other side is open, such that the notch may be open toward three directions. Even in such cases, it is possible to restrict the movement (the movement of any one side of the width direction) of the cartridges  10  and  10   a  in the mounting state, thereby suppressing the deviation of the circuit board  130  relative to the holder  20 . Furthermore, like the embodiments mentioned above, it is possible to improve the operability upon attaching or detaching the cartridges  10  and  10   a  to or from the holder  20  by the rotation fulcrums  166   w  and  216   w  or the deformation portion  212  of the holder  20 . 
     C-4. Fourth Modified Example 
     In the embodiments mentioned above, although the second wall  100   b  of the cartridges  10  and  10   a  has the shape having the first vertical wall portion  100   b   1 , the inclined wall portion  100   b   2 , and the second vertical wall portion  100   b   3 , the shape of the cartridge  10  may adopt an arbitrary shape. For example, the shape may be an approximately rectangular shape not having the inclined wall portion  100   b   2  or a shape in which the second wall  100   b  is uniformly inclined. The respective walls  100   a  to  100   f  may be tilted at any angle, and an angle at which the respective walls  100   a  to  100   f  intersect with each other may be an angle other than 90°. That is, if the liquid accommodation chamber  180  can be formed in which ink can be accommodated in the inner portion thereof, the cartridges  10  and  10   a  can adopt any shape. 
     C-5. Fifth Modified Example 
     In the embodiments mentioned above, although the outer surface of the third wall  100   c  of the cartridges  10  and  10   a  used the rotation fulcrum  166   w  ( FIG. 3A ), the protrusion may be provided in the third wall  100   c  to use the protrusion as the rotation fulcrum  166   w . Even in such cases, by rotating the cartridges  10  and  10   a  by the rotation fulcrum  166   w , the cartridge  10  can be easily detached from the holder  20 . 
     C-6. Sixth Modified Example 
     In the embodiments mentioned above, although the cartridges  10  and  10   a  use a protrusion portion  160 , the protrusion portion can be omitted. The holder  20 , the guide groove  200   t  and the hole portion  202  ( FIGS. 7A and 7B ) may also be omitted. Even in such cases, it is possible to improve the operability upon attaching or detaching the cartridges  10  and  10   a  to or from the holder  20  by the rotation fulcrums  166   w  and  216   w  or the deformation portion  212  of the holder  20 . 
     C-7. Seventh Modified Example 
     In the embodiments mentioned above, although the guide groove  200   t  of the holder  20  had the tapered lower guide groove  200   tu , the invention is not so limited. For example, the width of the guide groove  200   t  may be approximately uniform. Even in such cases, it is possible to easily guide the protrusion portion  160  up to the hole portion  202  of the holder  20  by the guide groove  200   t.    
     C-8. Eight Modified Example 
     In the embodiments mentioned above, although the terminals of the circuit board  130  were constituted by two rows, the terminals may be constituted by one row and three rows or more. When the terminals are constituted by three rows or more, it is preferable that the first row closest to the first restriction portion (the notch)  140  include more terminals than those of the row farthest from the first restriction portion (the notch)  140 . In this manner, it is possible to satisfactorily maintain the electric connection between each terminal included in the first and second rows and the printer  1 . Furthermore, when the terminals are constituted by three rows or more, it is preferable that more terminals are positioned close to the first restriction portion (the notch)  140 ) so as to satisfactorily maintain the electric connection between each terminal of the circuit board  130  and the printer  1 . 
     C-9. Ninth Modified Example 
     In the first embodiment, although the elastic portion (the lever)  120  was provided in the second wall  100   b  of the cartridge  10 , the engagement release portion  122  may be provided on the holder  20  side while forming the container side engagement portion  124  in the second wall  100   b  of the cartridge  10 . Even in such cases, the external force is applied to the engagement release portion  122  by a user so that engagement between the holder  20  and the container side engagement portion  124  can be released. 
     C-10. Tenth Modified Example 
     In the embodiments mentioned above, although the configuration was described in which the circuit board  130  ( FIGS. 5A and 5B ) including the terminal group  130   t  having nine terminals  130   a  to  130   i  and the storage portion  133  is attached to the container main body  100 , a configuration may be adopted in which the terminal group  130   t  is directly provided in the container main body  100 . Even in such a configuration, it is possible to suppress the movement (the deviation) of the terminal group  130   t  relative to the liquid ejecting apparatus (the printer  1 ) in the width direction, thereby satisfactorily maintaining the contact between the terminal group  130   t  and the liquid ejecting apparatus (the printer  1 ). In this case, it is more preferable that the notch  140  is provided in the container main body  100  so as to overlap a part of the terminal group  130   t  in regard to the length direction (the X axis direction). In this manner, it is possible to further suppress the movement (the deviation) of the terminal group  130   t  relative to the liquid ejecting apparatus (the printer  1 ) in the width direction. 
     C-11. Eleventh Modified Example 
     In the embodiments mentioned above, although the apparatus side opposed wall  25   c  of the holder  20  had the deformation portion  212  ( FIG. 8 ), the deformation portion  212  may not be included. Even in this case, by having the rotation fulcrum  166   w  and  216   w , it is possible to improve the operability upon attaching or detaching the cartridges  10  and  10   a  to or from the holder  20 . 
     C-12. Twelfth Modified Example 
     The shapes of the cartridges  10  and  10   a  are not limited to the embodiments mentioned above, and various shapes can be adopted.  FIGS. 29A and 29B  are diagrams for describing a cartridge  10   d  of a twelfth modified example.  FIG. 29A  is a side view of the cartridge  10   d  in which the cartridge  10   d  is viewed from the fifth wall  100   e  side.  FIG. 29B  is a diagram for describing the wall of the cartridge  10   d . As shown in  FIG. 29A , the cartridge main body  100   df  of the cartridge  10   d  has a side surface of an oval shape or an oblong shape. The liquid accommodation chamber  180   f  also has a side surface of an overall shape or an oblong shape. Furthermore, the cartridge main body (the container main body)  100   df  is provided with the lever  120  and the circuit board  130  on the front side thereof. The liquid supply port  110  is formed on the bottom side of the cartridge  10   d , and the protrusion  160  is formed on the bottom side thereof. In addition, when viewing the cartridge  10   d  from the front side (a side provided with the lever  120 ), the cartridge  10   d  has a uniform width like  FIG. 3B . In addition, the liquid accommodation chamber  180   f  also has the uniform width. 
     A defining method of the wall of the cartridge  10   d  will be described hereinafter. As shown in  FIG. 18B , the first wall  100   a  is a wall in the Z axis negative direction with respect to the liquid accommodation chamber  180   f , and constitutes the bottom surface in the mounting posture. The second wall  100   b  is a wall in the X axis positive direction with respect to the liquid accommodation chamber  180   f . The second wall  100   b  is connected to the first wall  100   a  and enters the erected state. The third wall  100   c  is a wall in the Z axis negative direction with respect to the liquid accommodation chamber  180   f . The third wall  100   c  faces the second wall  100   b  with the liquid accommodation chamber  180   f  interposed therebetween. The fourth wall  100   d  is a wall in the Z axis positive direction side with respect to the liquid accommodation chamber  180   f  and constitutes the upper surface in the mounting posture. The fourth wall  100   d  faces the first wall  100   a  with the liquid accommodation chamber  180   f  interposed therebetween. The fifth wall  100   e  is a wall in the Y axis positive direction with respect to the liquid accommodation chamber  180   f . The sixth wall  100   f  is a wall in the Y axis negative direction with respect to the liquid accommodation chamber  180   f , and faces the fifth wall  100   e  with the liquid accommodation chamber  180   f  interposed therebetween. Herein, the notch (the groove)  140  is provided in the second wall  100   b  like the embodiments mentioned above. The notch  140  is formed on the outer surface of the second wall  100   b  as in the embodiments mentioned above. In addition, in order to facilitate understanding, the first to fourth walls  100   a  to  100   d  are illustrated with line hatching. 
     Herein, when the shape of the liquid accommodation chamber  180   f  or the shape of the cartridge  10   d  are complex, the wall can be defined by the method described below. That is, a hypothetical case  180   fg  is defined which is accommodated in the liquid accommodation chamber  180   f  and the hypothetical case  180   fg  has an approximately rectangular shape of the largest volume. Each wall  100   a  to  100   fw  can be defined depending on which side is situated on the basis of the hypothetical case  180   fg . In addition, when the cartridge includes a plurality of liquid accommodation chambers, among the space portions of the approximately cubic body accommodating the plurality of liquid accommodation chambers, a minimum space portion having a minimum volume is defined. Moreover, the minimum space portion may be assumed to be a single liquid accommodation chamber to define the hypothetical case  180   fg.    
     Furthermore, even when the shape of the cartridge is a shape other than the approximately cubic body, as shown by dashed lines in  FIG. 18A , it is possible to hypothetically consider six surfaces of the approximately cubic body, that is, a bottom surface (a first surface)  100   fa , a front surface (a second surface)  100   fb , a rear surface (a third surface)  100   fc , an upper surface (a fourth surface)  100   fd , a left surface (a fifth surface)  100   fe , and a right surface (a sixth surface)  100   ff . Herein, the respective surfaces (the first to sixth surfaces)  100   fa  to  100   ff  correspond to the outer surfaces of the first to sixth walls  100   a  to  100   f  of  FIGS. 3A to 3D . The six surfaces  100   fa  to  100   ff  of the approximately cubic body are surfaces that form the approximately cubic body of the minimum volume among the approximately cubic body accommodating the cartridge main body  100   df . In the present description, “surfaces (plane)” can be used in the sense that includes both of the hypothetical surfaces (also called a non-existence plane) and the existence surface as shown in  FIGS. 3A to 3D . Furthermore, the term “surfaces” is used in the sense that includes both the plane and the curved surface. 
     C-13. Thirteenth Modified Example 
     In the embodiments and the modified examples mentioned above, the cartridges  10  and  10   a  to be used in the printer  1  as the liquid accommodating container were described as an example. However, the invention can be applied to, for example, a liquid accommodating container that can supply liquid to an apparatus such as a liquid crystal display including a color material ejecting head, an apparatus such as an organic EL display and a face emission display (FED) including an electrode material (a conductive paste) ejecting head to be used in forming the electrode, an apparatus including a bio-organic ejecting head used in manufacturing a bio chip, an apparatus including a sample ejecting head as a precision pipette, and a liquid ejecting apparatus such as a printing apparatus or a micro-dispenser, without being limited thereto. Furthermore, the invention can be applied to a holder on which various liquid accommodating containers can be mounted in a freely attachable or detachable manner without being limited to the ink cartridge. When the liquid accommodating container is used in the various liquid ejecting apparatuses, liquid (the color material, the conductive paste, the bio-organic matter or the like) depending on the type of liquid to be ejected by the various liquid ejecting apparatuses may be accommodated in the inner portion of the liquid accommodating container. Furthermore, the invention can be applied as various liquid ejecting apparatuses including the holder, and a liquid ejecting system that includes the liquid accommodating containers corresponding to the various liquid ejecting apparatuses.