Abstract:
A liquid storage container is provided with a liquid storage part capable of storing a liquid, and a liquid supply part for supplying the liquid to the outside. The liquid supply part has a porous member containing holes for circulating the liquid, and a biasing member which is disposed between the porous member and the liquid storage part and which biases the porous member from the liquid storage part towards the outside.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a national phase application of International Application No. PCT/JP2013/004784 filed on Aug. 7, 2013. This application claims priority to Japanese Application No. 2012-176496 filed on Aug. 8, 2012, Japanese Application No. 2012-176497 filed on Aug. 8, 2012, Japanese Application No. 2012-176498 filed on Aug. 8, 2012, Japanese Application No. 2012-191446 filed on Aug. 31, 2012, and Japanese Application No. 2013-125321 filed on Jun. 14, 2013. The entire disclosures of Japanese Application Nos. 2012-176496, 2012-176497, 2012-176498, 2012-191446 and 2013-125321 are hereby incorporated herein by reference. 
     TECHNOLOGICAL FIELD 
     The present invention relates to a liquid storage container and a liquid supply system. 
     BACKGROUND TECHNOLOGY 
     In a liquid consumption device in which a liquid storage container is mounted, as described in Japanese Unexamined Patent Application Publication No. 2005-205893, when the liquid storage container is mounted on the liquid consumption device, the liquid is supplied from the liquid storage container to the liquid consumption device by contacting a liquid supply part provided in the liquid storage container and a liquid introduction port provided in the liquid consumption device. For example, in the ink-jet printer described in Japanese Unexamined Patent Application Publication No. 2011-207066, a foam is provided in a liquid supply part of the ink cartridge, and a metal filter is provided in the liquid introduction port of the ink-jet printer, and the liquid supply is performed by contacting these parts. 
     SUMMARY 
     However, in the technology described in Japanese Unexamined Patent Application Publication No. 2005-205893 or Japanese Unexamined Patent Application Publication No. 2011-207066, the problems such as variations in dimension of the liquid supply part or the liquid introduction port, changes of installation environment, deteriorations due to the repetition of attachment and detachment, etc. have not been considered. Therefore, the technology in which the liquid is stably and promptly supplied to the liquid introduction part of the liquid consumption device is desired by making the liquid supply part well contact with the liquid introduction port even if these problems occur. 
     The present invention was made to solve at least a part of the aforementioned problems, and can be actualized as the following embodiments or applied examples. 
     A liquid storage container according to a first aspect includes a liquid storage part capable of storing liquid, and a liquid supply part supplying the liquid to an outside. The liquid supply part is provided with a porous member including holes to flow the liquid, and a biasing member provided between the porous member and the liquid storage part to bias the porous member in a direction from the liquid storage part to the outside. 
     With such structure, the porous member is biased to the outside, that is, a direction from the liquid storage part to the porous member by the biasing member. Therefore, in a case in which the storage container is mounted on the liquid consumption device, even when the problems such as variations in the dimensions of the liquid supply part or the liquid introduction port, the changes of installation environment, deteriorations due to the repetition of attachment and detachment, etc. occur, the porous member is brought into good contact with the porous member provided in the liquid introduction port of a liquid consumption device. Therefore, the liquid inside the liquid storage part can be stably supplied to the liquid consumption device. The biasing member may be directly contacted with the porous member, or may be indirectly contacted via another member. 
     The liquid storage container according to a second aspect is the liquid storage container described in the first aspect, in which a support member is provided between the porous member and the liquid storage part, and supports the porous member. 
     With such structure, the porous member is brought into good contact with the porous member provided in the liquid introduction port of the liquid consumption device. The support member may directly support the porous member, or may indirectly support another member. 
     The liquid storage container according to a third aspect is the liquid storage container described in the second aspect, in which the support member is provided with flow holes to be capable of flowing the liquid between the liquid storage part and the porous member. 
     With such structure, the flow of the liquid between the liquid storage part and the porous member is not blocked by the support member, so that the liquid can be supplied to the liquid introduction port of the liquid consumption device. 
     The liquid storage container according to a fourth aspect is the liquid storage container described in the third aspect, in which a flow channel formation member is provided between the support member and the porous member, and includes holes to form a flow channel in a direction from the liquid storage part to the porous member. 
     With such structure, the pressure loss of the liquid passed through the flow holes of the support member is reduced by the flow channel formation member, and therefore, the liquid can be uniformly flowed to the porous member. Further, it can prevent the porous member from getting into the flow holes of the support member by arranging the flow channel formation member. Thus, when the liquid storage container is mounted on the liquid consumption device, it is possible to suppress the entering of the air between the porous member and the porous member provided in the liquid introduction port of the liquid consumption device. 
     The liquid storage container according to a fifth aspect is the liquid storage container described in the fourth aspect, in which an average of equivalent diameters of the holes provided in the flow channel formation member is greater than an average of equivalent diameters of the holes provided in the porous member. 
     With such structure, the capillary force of the porous member in container side can be greater than the capillary force of the flow channel formation member, so that the meniscus of the liquid can be formed to the outside. Thus, when the liquid storage container is mounted on the liquid consumption device, it is possible to promptly supply the liquid to the liquid introduction part of the liquid consumption device. 
     The liquid storage container according to a sixth aspect is the liquid storage container described in any one of the second to fifth aspects, in which the biasing member and the support member are integrally formed. 
     With such structure, the production cost of the liquid storage container can be reduced. 
     The liquid storage container according to a seventh aspect is the liquid storage container described in any one of the first to sixth aspects, in which an average of equivalent diameters of holes provided on a surface of the porous member in an opposite side of the liquid storage part is smaller than an average of equivalent diameters of holes provided on a surface of the porous member in a liquid storage part side. 
     With such structure, the porous member can increase the capillary force of the outside (porous member side provided in the liquid introduction port of the liquid consumption device), so that the meniscus of the liquid surface can be formed more outside. Therefore, when the liquid storage container is mounted on the liquid consumption device, it is possible to promptly supply the liquid to the liquid introduction part of the liquid consumption device. 
     The liquid storage container according to an eighth aspect is the liquid storage container described in any one of the first to seventh aspects, in which the porous member is provided in a manner of projecting along a direction from the liquid storage part to the porous member. 
     With such structure, when the porous member contacts with the porous member provided in the liquid introduction port of the liquid consumption device, the tensile stress applied to the porous member can be suppressed, so that the deterioration of the porous member in the liquid supply container can be suppressed. 
     The liquid storage container according to a ninth aspect is the liquid storage container described in any one of the first to eighth aspects, the liquid supply part includes a second porous member, and the second porous member is fixed in a top end of the liquid supply part in a manner of covering an opening of the top end of the liquid supply part. 
     With such structure, the porous member is made in a double structure, so that the structure of the liquid supply part can be reinforced. Thus, even though the liquid storage container is repeatedly attached and detached on the liquid consumption device, it is hard to break or damage the porous member. Further, the second porous member is fixed in the top end of the liquid supply part, so that in case, even when the second porous member is broken or damaged, it is possible to easily replace it to a new one. Therefore, it is possible to continuously use the liquid storage container for a long term. 
     A liquid storage container according to a tenth aspect includes a liquid storage part capable of storing liquid, and a liquid supply part. The liquid supply part is provided with a porous member including holes to flow the liquid, and a flow channel formation member provided between the porous member and the liquid storage part and including holes to form a flow channel in a direction from the liquid storage part to the porous member. An average of equivalent diameters of the holes provided in the flow channel formation member is greater than an average of equivalent diameters of the holes provided in the porous member. 
     With such structure, the capillary of the porous member can be made greater than the capillary of the flow channel formation member, so that the meniscus of the liquid can be formed in the outside. Therefore, when the liquid storage container is mounted on the liquid consumption device, it is possible to promptly supply the liquid to the liquid introduction part of the liquid consumption device. 
     A liquid storage container according to an eleventh aspect includes a liquid storage part capable of storing liquid, and a liquid supply part. The liquid supply part is provided with a porous member including holes to flow the liquid, and a flow channel formation member provided between the porous member and the liquid storage part and including holes to form a flow channel in a direction from the liquid storage part to the porous member. The porous member is provided in a manner in which an average of equivalent diameters of holes provided on a surface in an opposite side of the liquid storage part is smaller than an average of equivalent diameters of holes provided on a surface in a liquid storage part side. 
     With such structure, the porous member can increase the capillary force of the outside, so that the meniscus of the liquid surface can be formed more outside. Therefore, when the liquid storage container is mounted on the liquid consumption device, it is possible to promptly supply the liquid to the liquid introduction part of the liquid consumption device. 
     The liquid storage container according to a twelfth aspect is the liquid storage container described in the tenth or eleventh aspect, in which a liquid storage chamber is partitioned from the liquid storage part by a partition wall and communicates to the liquid storage part via a communication hole and communicating to the liquid supply part. A first part of the flow channel formation member is positioned in the liquid supply part, and a second part of the flow channel formation member is positioned in the first part of the liquid storage chamber. 
     In this liquid storage container, when the air is accumulated in the liquid storage chamber, the air blocks the liquid supply part, so that the liquid is not supplied. In this liquid storage container, the first part of the flow channel formation member is positioned in the liquid supply part, and the second part of the flow channel formation member is positioned in the first position of the liquid storage chamber. With this structure, the flow channel formation member retains the liquid and functions as a flow channel of the liquid. With this, even when the air is entered into the liquid storage chamber, the flow channel of the liquid is easily maintained. Therefore, in this liquid storage container, the liquid is easily and stably supplied from the liquid supply part. 
     The liquid storage container according to a thirteenth aspect is the liquid storage container described in the tenth or eleventh aspect, in which a liquid storage chamber is partitioned from the liquid storage part by a partition wall and communicates to the liquid storage part via a communication hole and communicating to the liquid supply part. A second flow channel formation member, which is different from the flow channel formation member, is positioned in a first part of the liquid storage chamber. 
     In this liquid storage container, when the air is accumulated in the liquid storage chamber, the air blocks the liquid supply part, so that the liquid is not supplied. In this liquid storage container, the second flow channel formation member which is different from the flow channel formation member is positioned in the first part of the liquid storage chamber. With such structure, the flow channel formation member and the second flow channel formation member retains the liquid and functions as a flow channel of the liquid. With this, even when the air is entered into the liquid storage chamber, the flow channel of the liquid is easily maintained. Therefore, in this liquid storage container, the liquid is easily and stably supplied from the liquid supply part. 
     The liquid storage container according to a fourteenth aspect is the liquid storage container described in the twelfth aspect, in which a second flow channel formation member, which is different from the flow channel formation member, is positioned in a second part of the liquid storage chamber. 
     In this liquid storage container, the second flow channel formation member, which is different from the flow channel formation member, is positioned in the second part of the liquid storage chamber, so that in the liquid storage chamber, the second flow channel formation member retains the liquid and functions as a flow channel of the liquid. Therefore, even when the air is entered into the liquid storage chamber, the flow channel of the liquid is maintained more easily. 
     The liquid storage container according to a fifteenth aspect is the liquid storage container described in the twelfth or thirteenth aspect, in which a capillary force generation structure capable of contacting with the flow channel formation member is positioned in the second part of the liquid storage chamber. 
     In this liquid storage container, the capillary force generation structure capable of contacting with the flow channel formation member is positioned in the second part of the liquid storage chamber, so that the liquid is easily guided from the second part of the liquid storage chamber to the flow channel formation member. With this, even when the air is entered into the liquid storage chamber, the flow channel of the liquid is maintained more easily. 
     The liquid storage container according to a sixteenth aspect is the liquid storage container described in the tenth or eleventh aspect, in which a negative pressure adjustment structure capable of applying a negative pressure to the liquid, an atmosphere communication structure capable of adjusting the negative pressure, a liquid remaining amount measurement structure capable of measuring a remaining amount of the liquid, and a capillary force generation structure are arranged in the liquid storage part. The flow channel formation member is capable of contacting with the capillary force generation structure. 
     In this liquid storage container, the capillary force generation structure is provided in the liquid storage part, and it is possible to contact the flow channel formation member, which is provided in the liquid supply part, with the capillary force generation structure. In this liquid storage container, even when the empty of the remaining amount of the liquid inside the liquid storage part is determined via the liquid remaining amount measurement structure, the liquid retained in the capillary force generation structure can be supplied to the flow channel formation member. With this, even when the empty of the remaining amount of the liquid inside the liquid storage part is determined, the liquid can be supplied from the liquid supply part for a certain period of time. Further, according to this liquid storage container, the flow channel of the liquid is maintained by the capillary force generation structure and the flow channel formation member, so that it easily prevents the air from blocking the liquid supply part. 
     A liquid storage container according to a seventeenth aspect capable of supplying liquid to a liquid ejection device includes a liquid storage part capable of storing liquid, and a liquid supply part communicating to the liquid storage part and being capable of supplying the liquid to the liquid ejection device. A negative pressure adjustment structure capable of applying a negative pressure to the liquid, an atmosphere communication structure capable of adjusting the negative pressure, a liquid remaining amount measurement structure capable of measuring a remaining amount of the liquid, and a capillary force generation structure are arranged in the liquid storage part. A flow channel formation member contacting with the capillary force generation structure, and a porous member contacting with the flow channel formation member and being biased in a direction from the liquid storage part to the outside by the flow channel formation member and having greater bubble point pressure than the flow channel formation member are arranged in the liquid supply part. 
     In this liquid storage container, the capillary force generation structure is provided in the liquid storage part, and the flow channel formation member provided in the liquid supply part contacts with the capillary force generation structure. In this liquid storage container, even when the empty of the remaining amount of the liquid inside the liquid storage part is determined via the liquid remaining amount measurement structure, the liquid remained in the capillary force generation structure can be supplied to the flow channel formation member. With this, even when the empty of the remaining amount of the liquid inside the liquid storage part is determined, the liquid can be supplied from the liquid supply part for a certain period of time. Further, in this liquid storage container, the flow channel of the liquid is maintained by the capillary force generation structure and the flow channel formation member, so that it easily prevents the air from blocking the liquid supply part. Further, in this liquid storage container, the porous member contacting the liquid supply part and the flow channel formation member and being biased by the flow channel formation member towards the outside from the liquid storage part is arranged. The bubble point pressure of this porous member is greater than the bubble point pressure of the flow channel formation member. With this structure, the meniscus formed in the porous member can be maintained. 
     The liquid storage container according to an eighteenth aspect is the liquid storage container described in the seventeenth aspect, in which the capillary force generation structure is a second flow channel formation member. 
     In this liquid storage container, the liquid can be retained in the second flow channel formation member provided as the capillary force generation structure. 
     The liquid storage container according to a nineteenth aspect is the liquid storage container described in the seventeenth aspect, in which the capillary force generation structure is a groove provided between the liquid storage part and the liquid remaining amount measurement part. 
     In this liquid storage container, the liquid can be retained in the groove provided as the capillary force generation structure. 
     The liquid storage container according to a twentieth aspect is the liquid storage container described in any one of the first to nineteenth aspects, in which the porous member is fixed in a top end of the liquid supply part in a manner of covering an opening of the top end of the liquid supply part. 
     With such structure, in case, even when the porous member is broken or damaged, it is possible to easily replace to a new one. Therefore, it is possible to continuously use the liquid storage container for a long term. 
     The liquid storage container according to a twenty-first aspect is the liquid storage container described in any one of the first to nineteenth aspects, in which the porous member is fixed in the liquid supply part in a manner of covering an opening of the liquid supply part, and is a film having greater bubble point than the flow channel formation member. 
     With this structure, in case, even when the porous member is broken or damaged, it is possible to easily replace to a new one. Therefore, it is possible to continuously use the liquid storage container for a long term. In addition, the bubble point pressure of the porous member is greater than the bubble point pressure of the flow channel formation member. With this structure, the meniscus formed in the porous member can be maintained. 
     A liquid supply system according to a twenty-second aspect includes the liquid storage container described in any one of the first to twentieth aspects, a holder capable of mounting the liquid storage container, and a head arranging a nozzle to eject the liquid. The holder includes a liquid introduction part capable of introducing the liquid. The liquid introduction part includes a porous member in holder side, and when the liquid storage container is mounted on the holder, the porous member in container side contacts with the porous member in holder side. 
     With this structure, the porous member in container side is brought into good contact with the porous member in holder side, so that the liquid inside the liquid storage part can be stably supplied to the head. 
     Other than the aforementioned liquid storage container, liquid consumption device, or liquid supply system, the present invention may be configured as a production method for the liquid storage container, the liquid consumption device, or the liquid supply system, an application method for the liquid storage container, the liquid consumption device, or the liquid supply system, etc. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view showing a configuration of a liquid supply system; 
         FIG. 2  is a perspective view of a holder in which cartridges are mounted; 
         FIG. 3  is a perspective view showing a configuration of a cartridge; 
         FIG. 4  is a diagram showing a ZX cross-sectional surface of the cartridge; 
         FIG. 5  is an exploded perspective view of a liquid supply part; 
         FIG. 6A  is a ZX cross-sectional view showing a state in which the liquid supply part contacts with the liquid introduction part; 
         FIGS. 6B and 6C  are diagrams showing an example of a position relationship of a support member, a device-side-cylindrical-body, and a device-side-filter in a plan view 
         FIG. 7  is an explanatory diagram schematically showing an aspect of a cross-sectional surface configuration of foam and a container-side-filter when the filter forming through-holes, which are made in a film by a press-processing, etc., is used as the container-side-filter; 
         FIG. 8  is an explanatory diagram schematically showing an aspect of a cross-sectional surface configuration of the foam and the container-side-filter when a MMM film made by PALL Corporation is used as the container-side-filter; 
         FIG. 9  is an explanatory diagram schematically showing an aspect of a cross-sectional surface of the foam and the container-side-filter when the woven fabric made by FILTRONA Corporation is used as the container-side-filter; 
         FIG. 10  is an explanatory diagram showing a cross-sectional surface configuration of a surface configured in the X-axis and the Y-axis of the container-side-filter  273  shown in  FIG. 9 ; 
         FIG. 11  is an explanatory diagram showing a schematic configuration of a measurement device for measuring a meniscus pressure; 
         FIGS. 12A and 12B  are explanatory diagrams showing an effect by which the meniscus pressure of the container-side-filter satisfies formula (1) and formula (2); 
         FIG. 13  is a diagram showing pressure changes in each part when a detachment speed of the cartridge is slow; 
         FIG. 14  is a diagram showing pressure changes in each part when a detachment speed of the cartridge is fast; 
         FIG. 15  is a diagram when a plate spring and the foam shown in  FIG. 6  are replaced to a support foam; 
         FIG. 16  is a diagram showing a ZX cross-sectional surface of a cartridge according to the fourth embodiment; 
         FIG. 17  is an exploded perspective view of a liquid supply part; 
         FIG. 18  is a ZX cross-sectional view showing a state in which the liquid supply part contacts with the liquid introduction part; 
         FIG. 19  is a diagram showing a ZX cross-sectional surface of a cartridge according to the fifth embodiment; 
         FIG. 20  is a perspective view showing a cartridge according to the sixth embodiment; 
         FIG. 21  is a perspective view showing a configuration of a cartridge according to the sixth embodiment; 
         FIG. 22  is a plan view showing the first case according to the sixth embodiment; 
         FIGS. 23A and 23B  are perspective views showing the first case according to the sixth embodiment; 
         FIG. 24  is a perspective view showing the first case according to the sixth embodiment; 
         FIG. 25  is an explanatory diagram showing a configuration of the inside of the first case according to the sixth embodiment; 
         FIG. 26  is a diagram showing a state in which the cartridge according to the sixth embodiment is mounted on the holder; 
         FIGS. 27A to 27C  are cross-sectional views schematically showing the inside of the cartridge according to the sixth embodiment; 
         FIG. 28  is a ZX-cross-sectional view showing a state in which the liquid supply part according to the sixth embodiment contacts with the liquid introduction part; 
         FIG. 29  is a ZX-cross-sectional view showing a state in which the liquid supply part according to the sixth embodiment contacts with the liquid introduction part; 
         FIG. 30  is an explanatory diagram showing a configuration of the inside of the first case according to the seventh embodiment; 
         FIG. 31  is an explanatory diagram showing a configuration of the inside of the first case according to the eighth embodiment; 
         FIG. 32  is an enlarged view showing an A part in  FIG. 31 ; 
         FIG. 33  is an explanatory diagram showing a configuration of a cartridge according to the ninth embodiment; 
         FIG. 34  is an explanatory diagram showing a configuration of a cartridge according to the tenth embodiment; 
         FIG. 35  is an explanatory diagram showing a configuration of a cartridge according to the eleventh embodiment; 
         FIG. 36  is an explanatory diagram showing a configuration of a cartridge according to the twelfth embodiment; 
         FIG. 37  is a perspective view showing a cartridge and a cap according to the thirteenth embodiment; 
         FIG. 38  is a perspective view showing the cap according to the thirteenth embodiment; 
         FIG. 39  is a partial cross-sectional view when the cap is mounted to the cartridge according to the thirteenth embodiment; 
         FIG. 40  is an explanatory diagram showing a configuration of a cartridge according to the fourteenth embodiment; and 
         FIG. 41  is an explanatory diagram showing a configuration of a cartridge according to the fifteenth embodiment. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     A. First Embodiment 
       FIG. 1  is a perspective view showing a configuration of a liquid supply system  10  according to the first embodiment of the present invention. The liquid supply system  10  is provided with cartridges  20  as a liquid storage container in which the ink is stored inside, and a printer  50  as a liquid consumption device. In  FIG. 1 , XYZ axes, which are orthogonal to each other, are drawn. The XYZ axes in  FIG. 1  correspond to the XYZ axes in other drawings. Hereinafter, the XYZ axes are allotted in the drawings if necessary. In a using posture of the printer  50 , −Z-axis direction is a vertical direction, and a surface of +X-axis direction of the printer  50  is the front surface. 
     The printer  50  includes a main scanning feeding mechanism, a sub-scanning feeding mechanism, and a head driving mechanism. The main scanning feeding mechanism reciprocates a carriage  520  connected to a driving belt  524  in a main scanning direction by using a power of a carriage motor  522 . The sub-scanning feeding mechanism conveys a print sheet  90  in the sub-scanning direction by using a paper feeding roller  534  moved by a paper feeding motor  532  as the power. In the present embodiment, the main scanning direction of the printer  50  is the Y-axis direction, and the sub-scanning direction is the X-axis direction. The head driving mechanism performs ejecting the ink by driving the print head  540  provided in the carriage  520 . The printer  50  is provided with a control unit  510  for controlling each of the aforementioned mechanisms. The control unit  510  is connected with the carriage  520  via a flexible cable  517 . 
     The carriage  520  is provided with a holder  60  in which cartridges  20  are mounted, and the print head  540  in which a plurality of nozzles  541  (see  FIG. 6 ) for ejecting the ink is arranged facing to the print sheet  90 . The holder  60  is capable of mounting the plurality of cartridges  20  and is arranged in the upper side of the print head  540 . The cartridges  20  mounted on the holder  60  align in the Y-axis direction. In an example shown in  FIG. 1 , the holder  60  is capable of independently mounting six cartridges, and for example, each of the six cartridges such as black, yellow, magenta, cyan, light cyan, and light magenta is mounted. As the holder  60 , it is possible to use any plural types of cartridges other than the aforementioned cartridges. 
       FIG. 2  is a perspective view of the holder  60  in which the cartridges  20  are mounted.  FIG. 2  shows a state in which one cartridge  20  is mounted on the holder  60 . The holder  60  is provided with a cartridge storage chamber  602  in which the cartridges  20  are mounted from the upper side. The cartridge storage chamber  602  is partitioned by partition walls  607 , and they partition into a plurality of slots (mounting space) capable of mounting each cartridge  20 . Such partition walls  607  function as a guide when the cartridges  20  are inserted to the slots. By the way, it is possible that the partition walls  607  may be omitted. 
     In the cartridge storage chamber  602 , a lever  80 , a recessed part  620 , a projecting part  636 , a liquid introduction part  640 , and a contact mechanism  70  are provided in every slot. 
     The levers  80  are provided in the +X-axis direction side of the cartridge storage chamber  602 , and the recessed parts  620  are provided on the wall surface of the −X-axis direction side of the cartridge storage chamber  602 . When the cartridges  20  are mounted along the partition walls  607  from the upper side of the cartridge storage chamber  602 , the cartridges  20  are locked by these levers  80  and recessed parts  620 . When the cartridges  20  are mounted in the cartridge storage chamber  602 , the liquid supply parts  280  (see  FIG. 3 ) of the cartridges  20  are connected to the liquid introduction parts  640  provided on the bottom surface  601  of the cartridge storage chamber  602 . 
     The liquid introduction part  640  includes a device-side-cylindrical-body  645  provided on the bottom surface  601  of the cartridge storage chamber  602 , and a device-side-filter  642  provided on a top surface (surface in the +Z-axis side) of the device-side-cylindrical-body  645 . The device-side-filter  642  is formed by porous member such as, for example, a metallic mesh, a metallic non-woven fabric, a resin filter, etc. In the inside of the device-side-cylindrical-body  645 , an ink flow chamber  646  communicating with the print head  540  is formed into a funnel shape along the Z-axis direction (see  FIG. 6A ). The device-side-filter  642  provided on the top surface of the device-side-cylindrical-body  645  contacts with a container-side-filter  273  provided in the liquid supply part  280  of the cartridge  20  (see  FIG. 6A ). An elastic member  648  is provided surrounding the liquid introduction part  640 . The elastic member  648  tightly contacts with the surrounding of the liquid supply part  280  of the cartridge  20  in a state in which the cartridge  20  is mounted on the holder  60 . Therefore, the elastic member  648  prevents the ink from leaking to the outside from the liquid supply part  280 . 
     The contact mechanism  70  is electrically connected to the control unit  510  via a flexible cable  517 . The contact mechanism  70  is electrically connected to a terminal group  400  provided in a circuit substrate  40  (see  FIG. 3 ) of the cartridge  20  in a state in which the cartridge  20  is mounted on the holder  60 . With this, the contact mechanism  70  and the terminal group  400  of the cartridge  20  are electrically contacted, and therefore, each type of information can be transmitted between the control unit  510  and the cartridge  20 . 
       FIG. 3  is a perspective view showing a configuration of the cartridge  20 . The cartridge  20  is provided with a case  22  formed by synthetic resin such as polypropylene (PP), etc., a liquid storage part  200  formed in the case  22 , a liquid supply part  280  provided on the bottom surface of the case  22 , and the circuit substrate  40 . An arrow SD shown in  FIG. 3  indicates a direction to which the cartridge  20  is mounted on the holder  60 . 
     In the front surface  203  (the surface in +X-axis direction side) of the case  22 , a first projecting part  210  is provided. The first projecting part  210  is locked by the lever  80  (see  FIG. 2 ) provided in the cartridge storage chamber  602  when the cartridge  20  is mounted on the holder  60 . 
     In the back surface  204  (the surface in the −X-axis direction) of the case  22 , a second projecting part  220  is provided. The second projecting part  220  is locked by the recessed part  620  provided in the cartridge storage chamber  602  when the cartridge  20  is mounted on the holder  60 . 
     In a corner part where the front surface  203  and the bottom surface  201  (the surface in the −Z-axis direction) of the case  22  are intersected, an inclined surface  208  is provided. In the inclined surface  208 , the circuit substrate  40  is provided. In the front surface  408  of the circuit substrate  40 , the terminal group  400  that contacts with the contact mechanism  70  ( FIG. 2 ) of the holder  60  is provided. In the back surface of the circuit substrate  40 , a memory device such as an EEPROM, etc. electrically connected to the terminal group  400  is mounted. 
     The liquid supply part  280  communicates with the liquid storage part  200  inside the case  22 . The liquid supply part  280  is provided with a container-side-cylindrical-body  288  in which the top end (the end part in the −Z-axis direction) is opened. The top end part of the container-side-cylindrical-body  288  tightly contacts with the elastic member  648  provided on the bottom surface  601  of the holder  60  in the state that the cartridge  20  is mounted on the holder  60 . 
       FIG. 4  is a diagram showing a ZX cross-sectional surface of the cartridge  20 . In the inside of the cartridge  20 , the liquid storage part  200  is formed. In the bottom surface of the liquid storage part  200 , communication openings  281  to supply liquid to the liquid supply part  280  are provided. In the upper part of the communication openings  281 , a divider  230 , which partitions the liquid storage part  200  into an upper space  200   a  and a lower space  200   b , is provided. The divider  230  contacts with two side surfaces (the surface in the +Y-axis direction side and the surface in the −Y-axis direction side) and the back surface  204  of the case  22 , and inclines in the −Z-axis direction (vertically downward) from the back surface  204  side to the front surface  203  side. When the air (air bubble) is entered from the liquid supply part  280  to the inside of the cartridge  20 , the lower space  200   b  formed by this divider  230  becomes a space where the air bubble is accumulated. However, this divider  230  may be omitted. 
       FIG. 5  is an exploded perspective view of the liquid supply part  280 .  FIG. 6A  is a ZX cross-sectional view in a state in which the liquid supply part  280  contacts with the liquid introduction part  640 . As shown in these drawings, the liquid supply part  280  is configured by which the plate spring  271 , the foam  272  as a flow channel formation member, and the container-side-filter  273  as a porous member in container side are arranged in the recessed part  270  provided on the bottom surface  201  of the case  22 . The communication openings  281  are arranged in a part between the recessed part  270  and the liquid storage part  200  within the case  22 . 
     The container-side-filter  273  is a porous member provided in the outermost surface of the liquid supply part  280 . A peripheral edge part  273   a  of the container-side-filter  273  is welded to the case  22  surrounding the recessed part  270 . A central part  273   b  of the container-side-filter  273  is formed in a planer shape, and is projected toward the outer side (−Z-axis direction side) farther than the peripheral edge part  273   a  of the container-side-filter  273 . In a state in which the cartridge  20  is mounted on the holder  60 , the device-side-filter  642  provided in the holder  60  contacts with the central part  273   b  of the container-side-filter  273 . In a state in which the cartridge  20  is mounted on the holder  60 , an inclined part  273   c  between the peripheral edge part  273   a  of the container-side-filter  273  and the central part  273   b  does not contact with the device-side-filter  642  and forms meniscus of the ink (see  FIG. 6A ). By this meniscus, in a state in which the cartridge  20  is mounted on the holder  60 , the leakage of the liquid from the inclined part  273   c  of the container-side-filter  273  is suppressed. Further, the central part  273   b  of the container-side-filter  273  contacts with the foam  272  and the inclined part  273   c  does not contact with the foam  272 . 
     As the container-side-filter  273 , it is preferable to employ a filter capable of being welded to the case  22  and having a small pressure loss and a high meniscus pressure. As such filter material, for example, a filter forming through-holes, which are made in a film by a press-processing, etc., a symmetric membrane such as MMM film, etc. made by PALL Corporation, or a symmetric membrane such as, for example, a woven fabric can be employed. The phrase “meniscus pressure” means the pressure which withstands without braking meniscus of the ink (liquid), and it is also called as “bubble point pressure”. 
     For the formation method of the container-side-filter  273 , before the filter material is welded to a part surrounding the recessed part  270  within the case  22 , the filter material may be preliminary processed and formed in order to distinguish the peripheral edge part  273   a , the central part  273   b , and the inclined part  273   c . Further, when the filter material is welded to the part surrounding the recessed part  270  within the case  22 , it may be a deformation method in order to distinguish the peripheral edge part  273   a , the central part  273   b , and the inclined part  273   c.    
     The plate spring  271  is integrally provided with the biasing member  274  and the support member  275 . The plate spring  271  has a height which is approximately the same as the depth of the recessed part  270  provided in the case  22  or slightly higher than its depth. The plate spring  271  is arranged inside the recessed part  270  in the manner in which the support member  275  side is directed to the container-side-filter  273  (−Z-axis direction side). The biasing member  274  is formed in the manner in which legs provided in both ends of the long plate shaped support member  275  are bent to intersect in the +Z-direction side. A plurality of flow holes  276  which communicate in the Z-axis direction are provided in the plate shaped support member  275 . When the cartridge  20  is mounted on the holder  60 , the biasing member  274  has the function in which the container-side-filter  273  indirectly contacts with the device-side-filter  642  via the foam while pressing. At the time of pressing, the support member  275  flatly and indirectly supports the container-side-filter  273  via foam  272 , and the container-side-filter  273  is brought into surface contact with the device-side-filter  642 . 
       FIG. 6B  is a diagram showing an example of a position relationship of the support member  275 , the device-side-cylindrical-body  645 , and the device-side-filter  642  in a plan view. Here, the foam  272  is made of soft material, and when the plate spring  271  is deformed by biasing, the part in the container-side-filter  273  having an excellent adhesion with the device-side-filter  642  is the part which is biased to the support member  275 . In this part, the pressure loss in the case of the ink supply is reduced in comparison with a case in which the adhesion is not good because it is not biased. Further, an effective area  643 , which is an area surely flowing the ink in the device-side-filter  642 , is an area where the device-side-filter  642  and the top end surface of the device-side-cylindrical-body  645  are not overlapped within the area surrounding by the top end surface of the device-side-cylindrical-body  645 . Then, the container-side-filter  273  and the device-side-filter  642  are preferably tightly contacted in the manner in which the support member  275  entirely covers the effective area  643 . That is, it is preferable that in the plan view, the length (distance in the X-axis direction) of the support member  275  equals to the length (distance in the X-axis direction) of the effective area of the device-side-filter  632 , or it is longer than that, and in addition, the width (distance in the Y-axis direction) of the support member  275  equals to the width (distance in the Y-axis direction) of the effective area, or it is greater than that (see  FIG. 6B ). The effect can be obtained by which at least, the width (distance in the Y-axis direction) of the support member  275  equals to width (distance of the Y-axis direction) of the effective area, or it is greater than that. 
     Further, the ink supplied from the cartridges  20  to the print head  540  requires a flow rate in a certain level or more. It is preferable to enlarge the effective area  643  in order to increase the flow rate of the ink per a unit of time. On the other hand, the space where the cartridges  20  are arranged on the holder  60  is limited, so that it is necessary to reduce the width of the Y-axis direction of the cartridges  20  (see  FIG. 2 ). Therefore, it is preferable to reduce the width of the Y-axis direction of the liquid supply part  280  positioned on the bottom surface  201  of the case  22  of the cartridge  20  When the foam  272  is made of a soft material, in the plan view, when the width (distance in the Y-axis direction) of the support member  275  is defined as Y 1 , the width (distance in the Y-axis direction) of the circumference of the device-side-cylindrical-body  645  is defined as Y 2 , and the width (distance in the Y-axis direction) of the effective area is defined as Y 3 , the relationship of Y 2 ≧Y 1 ≧Y 3  is preferably satisfied (see  FIG. 6C ). 
     On the other hand, in a case in which the foam  272  is made of a hard material and it is not deformed even when the plate spring  271  biases it, the part in which the container-side-filter  273  has excellent tightness with the device-side-filter  642  is the part tightly contacting with the foam  272 . Then, it is preferable that in the plan view, the length (distance in the X-axis direction) of the foam  272  equals to the length (distance in the X-axis direction) of the effective area of the device-side-filter  642 , or it is longer than that, and in addition, the width (distance in the Y-axis direction) of the foam  272  equals to the width (distance in the Y-axis direction) of the effective area, or it is greater than that (see  FIG. 6B ). The effect can be obtained by which at least, the width (distance in the Y-axis direction) of the foam  272  equals to the width (distance in the Y-axis direction) of the effective area, or it is greater than that. 
     Further, in a case in which the foam  272  is made of a hard material, in the plan view, when the width (distance in the Y-axis direction) of the foam  272  is defined Y 1 , the width (distance in the Y-axis direction) of the circumference of the device-side-cylindrical-body  645  is defined as Y 2 , and the width (distance in the Y-axis direction) of the effective area is defined as Y 3 , the relationship of Y 2 ≧Y 1 ≧Y 3  is preferably satisfied (see  FIG. 6C ). 
     In the present embodiment, the biasing member  274  and the support member  275  are integrally formed with the plate spring  271 . However, these members may be separately configured. In this case, the biasing member  274  is not limited to the plate spring  271  as long as it has the function biasing the container-side-filter  273  to the outside, and it may be configured by other elastic body such as a coil, an elastic rubber, etc. 
     The foam  272  is a porous member arranged between the plate spring  271  and the container-side-filter  273 . The foam  272  planarly spreads the liquid, which is supplied from the inside of the liquid storage part  200  through the flow holes  276  provided in the support member  275  of the plate spring  271 , to the container-side-filter  273 . The thickness of the foam  272  is set in the thickness capable of planarly spreading the liquid supplied from the flow holes  276 . Further, in a state in which the container-side-filter  273  is biased to the device-side-filter  642  by the plate spring  271 , rigidity of the foam  272  becomes rigidity approximately in which the flow channel in the foam  272  is not closed. Projection parts  277  bent toward the plate spring  271  side are provided in the end parts of the +X-axis direction side and −X-axis direction side of the foam  272 . This projection parts  277  fit to the recessed parts  278  provided in the end parts of the +X-axis direction side and −X-axis direction side of the plate spring  271 . Therefore, the foam  272  is positioned with respect to the plate spring  271 . 
       FIG. 7  is an explanatory diagram schematically showing an aspect of the cross-sectional surface configuration of the foam  272  and the container-side-filter  273  when the filter forming through-holes, which are made in the film by the press-processing, etc., is used as the container-side-filter  273 . With, this aspect, an average of an equivalent diameter R 1  of holes formed in the foam  272  is greater than the average of the equivalent diameter R 2   a  of the cross-sectional surface on the surface configured in the X-axis and the Y-axis of the holes formed in the container-side-filter  273 . Further, with this aspect, in the container-side-filter  273 , the equivalent diameter R 4   a  of the cross-sectional surface on the surface configured in the X-axis and the Y-axis of the holes formed on the surface of the −Z-axis direction side (the side in device-side-filter  642 ) is smaller than the equivalent diameter R 3   a  of the cross-sectional surface on the surface configured in the X-axis and the Y-axis of the holes formed on the surface of the +Z-axis direction side (foam  272  side). The phrase “equivalent diameter” is defined as a cross-sectional circle diameter corresponding to the cross-section of the holes. 
       FIG. 8  is an explanatory diagram schematically showing an aspect of the cross-sectional surface configuration of the foam  272  and the container-side-filter  273  when MMM film made by PALL Corporation is used as the container-side-filter  273 . With this aspect, the average of the equivalent diameter R 1  of the cross sectional surface on the surface configured in the X-axis and Y-axis of the holes formed on the foam  272  is greater than the average of the equivalent diameter R 2   b  of the cross-sectional surface on the surface configured in the X-axis and Y-axis of the holes formed in the container-side-filter  273 . Further, with this aspect, in the container-side-filter  273 , the average of the equivalent diameter R 4   b  of the cross-sectional surface on the surface configured in the X-axis and Y-axis of the holes formed on the surface of the −Z-axis direction side (the side in the device-side-filter  642 ) is smaller than the average of the equivalent diameter R 3   b  of the cross-sectional surface on the surface configured in the X-axis and Y-axis of the holes formed on the surface of the +Z-axis direction side (foam  272  side). By the way, the holes in the MMM film are not limited to the spherical space, but the configuration in which one space is formed by connecting a plurality of spherical spaces is included. 
       FIG. 9  is an explanatory diagram schematically showing an aspect of the cross-sectional surface configuration of the foam  272  and the container-side-filter  273  when the woven fabric made by FILTRONA Corporation is used as the container-side-filter  273 .  FIG. 10  is an explanatory diagram showing the cross-sectional surface configuration configured in the X-axis and Y-axis of the container-side-filter  273  shown in  FIG. 9 . With this aspect, the average of the equivalent diameter R 1  ( FIG. 9 ) of the cross-sectional surface on the surface configured in the X-axis and Y-axis of the holes formed in the foam  272  is greater than the average of the equivalent diameter R 2   c  ( FIG. 10 ) of the cross-sectional surface on the surface configured in the X-axis and Y-axis of the holes formed on the container-side-filter  273 . 
     According to the first embodiment described above, when the cartridge  20  is mounted on the holder  60 , the container-side-filter  273  is biased to the device-side-filter  642  by the biasing member  274 , so that variations of the pressing force of the container-side-filter  273  with respect to the device-side-filter  642  can be absorbed. As a result, even when the cartridges  20  (liquid supply part  280 ) and the printer  50  (liquid introduction part  640 ) have individual differences or environmental changes, plastic deformation due to the repetition of the attachment and the detachment, etc., the container-side-filter  273  and the device-side-filter  642  can be adhered in excellent contact state. As a result, the ink inside the cartridges  20  can be stably supplied to the printer  50 . 
     Further, in the present embodiment, the plate spring  271  is provided with the planer shaped support member  275 , and the container-side-filter  273  is biased by the biasing member  274  via this support member  275 . Therefore, the container-side-filter  273  can evenly contact with the device-side-filter  642 . 
     Further, in the present embodiment, since the foam  272  is arranged between the plate spring  271  and the container-side-filter  273 , the flow channel area of the ink reduced by the flow holes  276  of the support member  275  can be re-expanded in the foam  272 . Therefore, the pressure loss caused by the flow holes  276  of the support member  275  can be reduced. Further, since the flow channel area of the ink in the foam  272  can be expanded, the ink can planarly and uniformly flow to the container-side-filter  273 . Further, in the present embodiment, since the foam  272  is arranged between the plate spring  271  and the container-side-filter  273 , it can prevent the container-side-filter  273  from getting into the flow holes  276  of the support member  275 . Therefore, when the cartridges  20  are mounted on the holder  60 , it can prevent a gap from expanding between the container-side-filter  273  and the device-side-filter  641 , and the occurrence of the air bubble in its gap can be suppressed. 
     Further, in the present embodiment, as the container-side-filter  273 , in the aspects ( FIGS. 7 to 10 ) in which either one of the asymmetric membrane and the symmetric membrane is employed, the equivalent diameter R 1  of the cross-sectional surface on the surface configured in the X-axis and Y-axis of the holes formed in the foam  272  is greater than the equivalent diameters R 2   a , R 2   b , R 2   c  of the cross-sectional surface on the surface configured in the X-axis and Y-axis of the holes formed in the container-side-filter  273 , and therefore, the capillary force of the container-side-filter  273  becomes higher than that of the foam  272 . As a result, when the cartridges  20  are not mounted on the holder  60 , the meniscus of the ink is formed in the container-side-filter  273  provided in the outermost surface of the cartridges  20 . Therefore, when the cartridges  20  are mounted on the holder  60 , the ink can be smoothly supplied to the print head  540 . 
     Further, in the present embodiment, in the aspect ( FIGS. 7 and 8 ) in which the asymmetric membrane is employed as the container-side-filter  273 , the equivalent diameters R 4   a , R 4   b  of the cross-sectional surface on the surface configured in the X-axis and Y-axis of the holes formed on the surface of the −Z-axis direction side (side in the device-side-filter  642 ) are smaller than the equivalent diameters R 3   a , R 3   b  of the cross-sectional surface on the surface configured in the X-axis and Y-axis of the holes formed on the surface of the +Z-axis direction side (foam  272  side). Therefore, the capillary force in the outside (side in the device-side-filter  642 ) of the container-side-filter  273  becomes higher than that in the inside (foam  272  side). As a result, when the cartridges  20  are not mounted on the holder  60 , the meniscus of the ink is formed more outside within the container-side-filter  273 . Therefore, when the cartridges  20  are formed in the holder  60 , the liquid can be smoothly supplied to the print head  540 . 
     In the aspects ( FIGS. 7 to 10 ) in which any of the asymmetric membrane and the symmetric membrane is employed, bubble point pressure of the container-side-filter  273  is higher than the bubble point pressure of the foam  272 . As a result, when the cartridges  20  are not mounted on the holder  60 , the meniscus of the ink is formed in the container-side-filter  273  provided in the outermost surface of the cartridges  20 . Therefore, when the cartridges  20  are mounted on the holder  60 , the ink can be smoothly supplied to the print head  540 . 
     Further, the bubble point pressure of the device-side-filter  642  can be set to be higher than the bubble point pressure of the container-side-filter  273 . With such setting, when the cartridges  20  are mounted on the holder  60 , in a case in which the air is stuck between the container-side-filter  273  and the device-side-filter  642 , the air is pulled toward the container-side-filter  273  which is low bubble point pressure, so that possibility of the defect such as a nozzle-out due to the air entering into the print head  540 , etc. becomes low. 
     Further, in the present embodiment, the container-side-filter  273  has a shape projecting toward the device-side-filter  642 , so that when the container-side-filter  273  and the device-side-filter  642  are contacted, the tensile stress exerting to the container-side-filter  273  can be suppressed. As a result, for example, by pulling the container-side-filter  273  upwardly by the device-side-cylindrical-body  645  of the liquid introduction part  640 , the breakage or the damage of the container-side-filter  273  can be suppressed. 
     Further, in the present embodiment, the biasing member  274  and the support member  275  are uniformly formed, so that the production cost of the cartridge  20  is reduced, and in addition, the number of assembling processes of the cartridge  20  can be reduced. 
     Further, in the present embodiment, the plate spring  271  integrally formed with the biasing member  274  and the support member  275  is used, but it is not limited to the plate spring  271  as long as it has the function to project the container-side-filter  273  to the outside. For example, a support foam  372  which is greater thickness than the container-side-filter  273  may be used (see  FIG. 15 ).  FIG. 15  is a diagram showing the support foam  372  which substitutes from the plate spring  271  and the foam  272  in  FIG. 6A . Communication openings  281  between the support foam  372  and the liquid storage part  200  are positioned. A part of the support foam  372  is arranged in the inside of the recessed part  270 , and another part is projected to the outside from the recessed part  270 . With this, even when the circumference of the device-side-filter  642  is greater, and the device-side-filter  642  cannot be fitted in the recessed part  270  of the case  22 , another part of the support foam  372  is projected to the outside from the recessed part  270 , so that the container-side-filter  273  is easily pressed against the device-side-filter  642 . 
     Here, when the bubble point pressure of the support foam  372  is too low, the air is easily entered from the liquid supply part  280  to the liquid storage part  200 . However, when the bubble point pressure is too high, the pressure loss becomes large, so that the ink supply from the cartridges  20  to the print head  540  becomes difficult. The container-side-filter  273  in which the bubble point pressure is set to be greater than the bubble point pressure of the support foam  372  is used, and therefore, while it prevents the air from entering to the liquid storage part  200 , the cartridge  20  which supplies ink while suppressing the pressure loss can be provided. 
     The container-side-filter  273  is a porous member which is thinner than the support foam  372 , and it is welded to the case  22  and covers the support foam  372  to prevent the support foam  372  from coming off from the recessed part  270 . A foam as a negative pressure generation member may be arranged in the liquid storage part  200 , but it is preferable that at least the communication opening  281  functions as an ink chamber in which the negative pressure generation member is not arranged. The container-side-filter  273  can be omitted. 
     B. Second Embodiment 
     In the second embodiment of the present invention, in addition to the aforementioned 1 st  embodiment, a filter that satisfies the conditions described below is employed as the container-side-filter  273 . Specifically, as shown in the following formula (1), the filter having meniscus pressure PBf which is smaller than the value in which the biasing force F applying from the biasing member  274  to the container-side-filter  273  is divided by the contact area A between the container-side-filter  273  and the device-side-filter  642  is employed as the container-side-filter  273 .
 
 PBf&lt;F/A   (1)
 
     Further, in the present embodiment, as shown in the following formula (2), a filter having meniscus pressure PBf which is smaller than meniscus pressure PBr of the device-side-filter  642  is employed as the container-side-filter  273 .
 
 PBf&lt;PBr   (2)
 
       FIG. 11  is an explanatory diagram showing a schematic configuration of a measurement device  100  for measuring a meniscus pressure of the container-side-filter  273 . The measurement device  100  is provided with seal rubbers  102 ,  103  holding a filter  101  for measurement object from the upper surface and the lower surface, a housing  104  surrounding the peripheral of the filter  101  and the seal rubbers  102 ,  103 , and a tube  106  in which the back end is connected to a liquid inflow port  105  provided on the lower surface of the housing  104 . The upper surface of the housing  104  is provided with an atmosphere communicating port  107  communicating to the atmosphere, and the upper surface of the filter  101  is exposed to the atmosphere. The tube  106  is bent in a U-shape, and the top end is directed upwardly. 
     When such measurement device  100  is prepared, initially, the filter  101  of a measurement object is arranged inside the housing  104 , and the ink is injected from the top end. When the ink is injected, in a position where the ink is stabilized inside the tube  106 , the tube  106  is lowered vertically downward. In this way, at a height where the tube  106  is lowered, the air is taken into the inside of the ink via the filter  101  from the upper surface of the filter  101  and the air bubble is generated. When the generation of the air bubble is confirmed, the difference h between the height of the liquid surface inside the housing  104  when the air bubble starts generating and the height of the liquid surface inside the tube is measured. With such measurement, a meniscus pressure PB of the filter  101  of the measurement object is measured from drop amount h of the liquid surface of the ink inside the tube  106 .
 
 PB=ρ*g*h   (3)
 
     (ρ represents a density of the ink. g represents a gravity acceleration.) 
     In the present embodiment, the meniscus pressures of various filers are measured by such measurement method, and among them, the filter satisfying the aforementioned formulas (1) and (2) is employed as the container-side-filter  273 . The meniscus pressure measurement of the filter is not limited to such method, and it may be measured by other methods. 
       FIG. 12  is an explanatory diagram showing an effect obtained by which the meniscus pressure PBf of the container-side-filter  273  satisfies the aforementioned formulas (1) and (2). In the present embodiment, as shown in the aforementioned formula (1), the pressing force by the biasing member  274  is greater than the meniscus pressure PBf of the container-side-filter  273 . Therefore, in a case in which the air bubble is entered between the container-side-filter  273  and the device-side-filter  642  when the cartridges  20  are mounted on the holder  60  (see  FIG. 12A ), the large pressure is applied to the air bubble from the peripheral by the pressing force of the biasing member  274 . Therefore, the air bubble entered between the container-side-filter  273  and the device-side-filter  642  cannot be accumulated between the container-side-filter  273  and the device-side-filter  642 . And, as shown in the aforementioned formula (2), in the present embodiment, since the meniscus pressure PBf of the container-side-filter  273  is smaller than the meniscus pressure PBr of the device-side-filter  642 , the air bubble to which the pressing force is applied from the biasing member  274  is taken into the side of the container-side-filter  273  having smaller meniscus pressure (see  FIG. 12B ). As a result, the occurrence of the defects such as nozzle-out due to the air bubble entering to the nozzles  541  of the print head  540 , unstable printing, etc. can be prevented. 
     With this, when the defects of the nozzles  541  are prevented, the processes solving the defects of the nozzles  541  by the printer  50  are not necessary to be performed when the cartridges  20  are mounted on the holder  60 . Therefore, the printing process can be promptly started. As the processes solving the defects of the nozzles  541 , for example, after the ink in the cartridges  20  was suctioned from the print head  540  side and a predetermined amount of the ink was discharged, a cleaning process that wipes off the top end of the nozzles  541  is performed. This cleaning process when the cartridges  20  are mounted is called as “replacement cleaning process”. According to the present embodiment, since the execution of this replacement cleaning process is not required, the ink consumption due to the execution of the replacement cleaning process which is not the purpose of printing can be suppressed. 
     Further, in the present embodiment, in the same manner as the first embodiment, it has a configuration in which the ink is transferred from the liquid storage part  200  to the recessed part  270  and stores in the container-side-filter  273 . Since the thickness of the container-side-filter  273  is thin, the meniscus is formed on the surface and the wet condition is kept. In the case in which the cartridges  20  are mounted on the holder  60 , when the container-side-filter  273  contacts with the device-side-filter  642 , the transmission of the ink immediately starts. Therefore, with such configuration, since there is no space in which the ink is not existed between the container-side-filter  273  and the device-side-filter  642 , the execution of the replacement cleaning process is not required. 
     Here, in the cleaning process, the ink which is greater amount than the amount used in the normal printing operation is suctioned to the print head  540 . At this time, when the suction amount of the ink per unit of time exceeds a predetermined amount, the absolute value of the negative pressure between the container-side-filter  273  and the device-side-filter  642  becomes greater than the absolute value of the meniscus pressure PBf of the container-side-filter  273 , so that the meniscus of the container-side-filter  273  is broken, and the air is entered inside the container-side-filter  273  from the outside. Then, a flow channel in which the air entered to the inside from the inclined part  273   c  is suctioned out to the device-side-filter  642  via the central part  273   b  is created, and therefore, the cleaning does not function. In this time, the predetermined amount which is the threshold value is called as a cleaning limit flow rate. At the time of the cleaning process, as the cleaning limit flow rate becomes greater, the inside air is expanded due to the high negative pressure inside the print head  540 , so that the air can be easily discharged. Therefore, the effect in which the defects of the nozzles  541  are suppressed can be obtained by setting the cleaning limit flow rate to be greater. Accordingly, it is preferable to set the meniscus pressure PBf of the container-side-filter  273  in the manner in which the absolute value of the meniscus pressure PBf of the container-side-filter  273  becomes greater than the absolute value of the negative pressure between the container-side-filter  273  and the device-side-filter  642  caused by the cleaning limit flow rate. 
     Further, in the present embodiment, in the same manner as the first embodiment, the bubble point pressure of the container-side-filter  273  is higher than the bubble point pressure of the foam  272 . For example, the equivalent diameter of the cross-sectional surface on the surface configured in the X-axis and Y-axis of the holes formed on the surface of the +Z-axis direction side (foam  272  side) is greater than the equivalent diameter of the cross-sectional surface on the surface configured in the X-axis and Y-axis of the holes formed on the surface (side of the device-side-filter  642 ) of the −Z-axis direction side. Further, the equivalent diameter of the cross-sectional surface on the surface configured in the X-axis and Y-axis of the holes formed in the foam  272  is greater than the equivalent diameter of the cross-sectional surface on the surface configured in the X-axis and Y-axis of the holes formed in the container-side-filter  273 . Therefore, in a case in which the air bubble is taken into the inside from the container-side-filter  273 , blocking the rising of the air bubble due to buoyancy by the existence of the container-side-filter  273  or the foam  272  can be suppressed. As a result, it can further suppress entering the air bubble into the inside of the print head  540 . 
     In the present embodiment, the filter that satisfies both conditions of the aforementioned formulas (1) and (2) was employed as the container-side-filter  273 , but the filter that satisfies either one of the formulas may be employed as the container-side-filter  273 . 
     C. Third Embodiment 
     In the Third embodiment of the present invention, in addition to the aforementioned 1 st  embodiment, a filter that satisfies conditions described below is employed as the container-side-filter  273 . Specifically, when the cartridges  20  are detached from the holder  60 , regardless the speed of the detachment, the container-side-filter  273  in which the meniscus is easily broken than the meniscus formed in the nozzles  541  of the print head  540  is employed. 
     The meniscus pressure PBf of such container-side-filter  273  can be represented as the following formula (4). That is, the meniscus pressure P of the container-side-filter  273  in the present embodiment becomes a pressure smaller than the value that subtracts value α from the meniscus pressure PBn of the nozzles  541 .
 
 PBf&lt;PBn−α   (4)
 
     Here, the value α represents the total value of at least one of the following values (a) to (c). 
     (a) Difference between the dynamic meniscus pressure and the static meniscus pressure of the nozzles  541 . 
     (b) Pressure loss inside nozzles  541  caused when the cartridges  20  are detached from the holder  60 . 
     (c) Pressure reduction value due to the mechanical compliance of the inside of the nozzles  541  caused when the cartridges  20  are detached from the holder  60 . 
     The dynamic meniscus pressure means the pressure in which the meniscus is capable of enduring pressure when the pressure is rapidly applied to the meniscus, and the static meniscus pressure means the pressure in which the meniscus is capable of enduring pressure when the pressure is gradually applied to the meniscus. 
       FIG. 13  is a diagram showing pressure changes in each part in a case in which the detachment speed of the cartridge  20  is slow. Further,  FIG. 14  is a diagram showing pressure changes in each part in a case in which the detachment speed of the cartridge  20  is fast. In the graphs shown in these drawings, the horizontal axis represents time, and the vertical axis represents pressure (negative pressure). In  FIG. 13  and  FIG. 14 , each symbol represents the following values. 
     PBf: Meniscus pressure of the container-side-filter  273 . 
     PBn: Meniscus pressure of the nozzles  541 . 
     PN: Pressure inside the liquid supply part  280  in a case in which the air is not taken from the outside is assumed. 
     PH: Actual pressure inside the nozzles  541 . 
     As shown in  FIG. 13 , in the case that the detachment speed of the cartridge  20  is slow, the pressure PN (negative pressure) inside the liquid supply part  280  and the pressure PH (negative pressure) inside the nozzles  541  become greater in accordance with the lapse time when the cartridge  20  is detached because the pressing force by the biasing member  274  is released in accordance with the detachment of the cartridge  20 . However, these pressures PN, PH never exceeds the meniscus pressure PBf of the container-side-filter  273  and the meniscus pressure PBn of the nozzles  541 . Further, these pressures PN, PH become approximately the same pressure and show approximately the same pressure changes because the liquid supply part  280  and the nozzles  541  are connected by the container-side-filter  273  and the device-side-filter  642 . 
     With this, in the case in which the detachment speed of the cartridge  20  is slow, since the pressure PN inside the liquid supply part  280  and the pressure PH inside the nozzles  541  never exceed the meniscus pressure PBn of the nozzles  541 , the condition in which the meniscus of the nozzles  541  is not broken can be represented as the following formula (5). That is, when the actual pressure PH inside the nozzles  541  is smaller than the meniscus PBn of the nozzles  541 , the meniscus of the nozzles  541  is not broken.
 
 PH&lt;PBn   (5)
 
     On the other hand, as shown in  FIG. 14 , in the case in which the detachment speed of the cartridge  20  is fast, when it assumes that the air is not taken from the outside, in accordance with the lapse time when the cartridge  20  is detached, the pressure PN inside the liquid supply part  280  and the pressure PH inside the nozzles  541  exceed the meniscus pressure PBn of the nozzles  541 , so that the meniscus of the nozzles  541  is broken. However, in fact, at the time of exceeding the meniscus pressure of the container-side-filter  273 , the meniscus of the container-side-filter  273  (more specifically, the meniscus of the inclined part  273   c  of the container-side-filter  273 ) is broken, so that the air is entered into the liquid supply part  280  and the nozzles  541 . Therefore, even though the actual pressure PH inside the nozzles  541  exceeds the value α from the meniscus pressure PBf of the container-side-filter  273 , it becomes the pressure which does not reach the meniscus pressure PBn of the nozzles  541 . That is, in the case in which the detachment speed of the cartridge  20  is fast, as shown in the following formula (6), the actual pressure PH inside the nozzles  541  becomes the pressure to be greater by value α from the meniscus pressure PBf of the container-side-filter  273 .
 
 PH=PBf+α   (6)
 
     As described above, the value α represents the total value of the difference between the dynamic meniscus pressure and the static meniscus pressure of the nozzles  541 , the pressure loss inside nozzles  541  generated when the cartridge  20  is detached, and the pressure reduction value due to the mechanical compliance of the inside of the nozzles  541  generated when the cartridge  20  is detached. The value α can be calculated by an actual simulation. In general, the dynamic meniscus pressure is greater than the static meniscus pressure. 
     With this, when the actual pressure PH inside the nozzles  541  in the case in which the detachment speed of the cartridge  20  is fast represents as the aforementioned formula (6), the following formula (7) is obtained by substituting this formula (6) into the aforementioned formula (5) indicating the condition in which the meniscus of the nozzles  541  is not broken. And, the aforementioned formula (4) is come up by transposing a in the left member of the following formula (7) to the right member, and therefore, the meniscus pressure PBf of the container-side-filter  273  employed in the present embodiment is calculated.
 
 PBf+α&lt;PBn   (7)
 
     According to the Third embodiment described above, by making the meniscus pressure PBf of the container-side-filter  273  smaller than the pressure by subtracting the value α from the meniscus pressure PBn of the nozzles  541 , regardless the detachment speed of the cartridge  20 , the meniscus of the container-side-filter  273  is broken easier than the meniscus of the nozzles  541 . Therefore, even though the detachment speed of the cartridge  20  is different depending on the user, the breakage of the meniscus of the nozzles  541  can be suppressed. As a result, when the cartridge  20  is replaced, the aforementioned replacement cleaning process is not required, so that it becomes possible to promptly perform the printing, and further, the ink consumption, which is used for the purpose other than the printing, by the execution of the replacement cleaning process can be suppressed. The condition of the meniscus pressure PBf of the container-side-filter  273  described in the present embodiment can be combined with the condition of the meniscus pressure PBf of the container-side-filter  273  described in the second embodiment. 
     D. Fourth Embodiment 
     In the fourth embodiment of the present invention, in addition to the aforementioned 1 st  embodiment, the second container-side-filter  279  is employed. The fourth embodiment is the same as the first embodiment except that the second container-side-filter  279  is employed. In  FIG. 16  and  FIG. 18 , for the same structural parts of the first embodiment, the same symbols as used in the description of the first embodiment are allotted, and the detailed descriptions are omitted. 
       FIG. 16  is a diagram showing a ZX cross-sectional surface of a cartridge  20 A of the fourth embodiment.  FIG. 17  is an exploded perspective view of the liquid supply part  280 A.  FIG. 18  is the ZX cross-sectional view showing a state in which the liquid supply part  280 A contacts the liquid introduction part  640 . 
     As shown in these drawings, in the same manner as the cartridge of the first embodiment, the liquid supply part  280  of the cartridge  20 A of the fourth embodiment is provided with a plate spring  271 , a foam  272  as a flow channel formation member, and a container-side-filter  273  as a porous member in container side. The plate spring  271 , the foam  272  and the container-side-filter  273  are arranged in the recessed part  270  provided on the bottom surface  201  of the case  22 . That is, the plate spring  271 , the foam  272 , and the container-side-filter  273  are provided inside the container-side-cylindrical-body  288  configuring the liquid supply part  280 . In addition, the liquid supply part  280  of the cartridge  20 A of the fourth embodiment is provided with the second container-side-filter  279  as the porous member in container side. The second container-side-filter  279  is provided in the top end (end part in the −Z-axis direction) of the liquid supply part  280 . That is, the second container-side-filter  279  is provided in the outside of the container-side-cylindrical-body  288 . The second container-side-filter  279  is provided to cover the opening of the top end (end part in the −Z-axis direction) of the liquid supply part  280 . The area of the second container-side-filter  279  is greater than the area of the opening of the top end (end part in the −Z-axis direction) of the liquid supply part  280 . The second container-side-filter  279  is fixed on the top end of the liquid supply part  280 , that is, top end  288   a  (end part in the −Z-axis direction) of the container-side-cylindrical-body  288 , by heat welding.  FIG. 17  shows the welding part  279   a  between the second container-side-filter  279  and the top end  288   a  of the container-side-cylindrical-body  288  in slanting line. 
     As shown in  FIG. 18 , in a state in which the cartridge  20 A is mounted on the holder  60 , the device-side-filter  642  provided in the holder  60  contacts with the central part of the second container-side-filter  279 . The central part  273   b  of the container-side-filter  273  contacts with the device-side-filter  642  via the second container-side-filter  279 . At this point, the central part of the second container-side-filter  279  is pulled upwardly (+Z-axis direction) by the device-side-cylindrical-body  645 . The second container-side-filter  279  is the planar shaped filter. However, in order to prevent the breakage from pulling by the device-side-cylindrical-body  645 , it is fixed in the top end  288   a  of the container-side-cylindrical-body  288  in a state in which the central part is capable of being slightly deformed. As a material of the second container-side-filter  279 , the same material of the container-side-filter  273  can be employed. 
     In the first embodiment, the container-side-filter  273  is a porous member and is provided in the outermost of the liquid supply part  280 . It is configured in the manner in which the capillary force of the container-side-filter  273  is higher than the capillary force of the foam  272 , or the capillary force in the outside (side of the device-side-filter  642 ) of the container-side-filter  273  is higher than the capillary force in the inside (foam  272  side). In the fourth embodiment, physically, the second container-side-filter  279  is a porous member and is provided in the outermost surface of the liquid supply part  280 . Therefore, it is configured in the manner in which the capillary force of the second container-side-filter  279  is higher than the capillary force of the foam  272  and the container-side-filter  273 , or the capillary force in the outside (side of the device-side-filter  642 ) of the second container-side-filter  279  is higher than the capillary force in the inside (side of the container-side-filter  273 ), so that when the cartridge  20  is mounted on the holder  60 , the liquid can be smoothly supplied to the print head  540 . 
     On the other hand, in the fourth embodiment, the capillary force of the second container-side-filter  279  is set lower than the capillary force of the container-side-filter  273  in a level that can ignore the liquid flow channel resistance, and in this case, the porous member provided in the outermost surface of the actual liquid supply part  280  can be deemed as the container-side-filter  273 . In this case, the properties of the container-side-filter  273  are set in the same manner as the first embodiment, so that the liquid can be smoothly supplied to the print head  540 . 
     In addition, in the fourth embodiment, in a state in which both of the two container-side-filters  273 ,  279  contact to each other, in order to obtain the same properties in the same manner as the container-side-filter  273  of the first embodiment, the properties of these container-side-filters  273 ,  279  can be set. 
     The concept of the property of the capillary force described above can be applied in the same manner related to the property of the bubble point pressure. 
     Further, the concept of the property of the capillary force described above can be applied in the same manner related to the property of the meniscus pressure PBf of the second embodiment and the Third embodiment. That is, in a case in which the second container-side-filter  279  actually becomes the porous member provided in the outermost surface of the liquid supply part  280 , by setting the meniscus pressure PBf of the second container-side-filter  279  as the second embodiment and the Third embodiment, the same effects as the second embodiment and the Third embodiment can be obtained. Further, in the case in which the flow channel resistance of the second container-side-filter  279  can be ignored, by setting the meniscus pressure PBf of the container-side-filter  273  as the second embodiment and the Third embodiment, the same effects as the second embodiment and the Third embodiment can be obtained. In addition, in a state in which the container-side-filters  273 ,  279  contact to each other, when the same properties as the container-side-filter  273  of the first embodiment are obtained, by setting the meniscus pressure PBf in the state of contacting these filters as the second embodiment and the Third embodiment, the same effects as the second embodiment and the Third embodiment can be obtained. 
     According to the cartridge  20 A of the fourth embodiment, the second container-side-filter  279  is provided downstream farther than the container-side-filter  273 . In a state in which the cartridge  20 A is mounted on the holder  60 , the container-side-filter  273  contacts with the device-side-filter  642  via the second container-side-filter  279 . That is, the filter that contacts with the device-side-filter  642  is configured by a double structure, so that the structure of the liquid supply part  280  can be reinforced. Specifically, even when the attachment and detachment of the cartridge  20 A are repeated, the filters  273 ,  279  are hard to be broken or damaged, and the cartridge  20 A can be continuously used for a long term. More specifically, the container-side-filter  273  does not contact with the device-side-filter  642  directly, and therefore, it is hard to be broken or damaged. 
     Further, according to the cartridge  20 A of the fourth embodiment, the second container-side-filter  279  is fixed in the top end  288   a  (end part of the −Z-axis direction) of the container-side-cylindrical-body  288  configuring the liquid supply part  280 . Therefore, for example, even when the second container-side-filter  279  is broken or damaged, it is possible to easily replace it to a new filter. Thus, the cartridge  20 A can be continuously used for a long term. 
     E. Fifth Embodiment 
     In the fifth embodiment of the present invention, in addition to the plate spring  271 , the foam  272 , and the container-side-filter  273  of the configuration of the aforementioned 4 th  embodiment, a foam  282  is employed as a flow channel formation member. Except this point, the fifth embodiment is the same structure as the fourth embodiment. In  FIG. 19 , for the same structural parts of the fourth embodiment, the same symbols as used in the description of the fourth embodiment are allotted, and the detailed descriptions are omitted. 
       FIG. 19  is a diagram showing a ZX cross-sectional surface of a cartridge  20 B of the fifth embodiment. As shown in  FIG. 19 , in addition to the plate spring  271 , the foam  272 , and the container-side-filter  273  of the cartridge  20 A of the fourth embodiment, the liquid supply part  280  of the cartridge  20 B of the fifth embodiment is provided with the foam  282  as a flow channel formation member. Further, the liquid supply part  280 B of the cartridge  20 B of the fifth embodiment is provided with the container-side-filter  279  as a porous member in container side in the same manner as the cartridge  20 A of the fourth embodiment. The foam  282  is arranged in the recessed part  270  provided on the bottom surface  201  of the case  22 . The foam  282  is provided to fill the space inside the container-side-cylindrical-body  288 . The foam  282  is provided between the communication opening  281  provided on the bottom surface  201  of the liquid storage part  200  and the container-side-filter  279 . The foam  282  is the porous member. The foam  272  supplies the liquid, which is supplied from the inside of the liquid storage part  200  via the communication opening  281  provided on the bottom surface  201  of the liquid storage part  200 , to the container-side-filter  279 . As the flow channel formation member, any material may be used as long as the liquid is supplied to the container-side-filter  279 , and in addition to the foam  282 , a liquid holding body such as a felt, a woven fabric, etc. can be employed. For the structure and the material of the container-side-filter  279 , it has been already described in the fourth embodiment. Further, the foam  282  is provided in any configuration as long as the liquid supplied from the inside of the liquid storage part  200  can be supplied to the container-side-filter  279 , so that it may not be filled in the entire space of the inside of the container-side-cylindrical-body  288 . The foam  282  may be provided in a part of the space of the inside of the container-side-cylindrical-body  288 . It is possible to smoothly supply the liquid to the container-side-filter  279  as long as the foam  282  is provided in the manner in which at least, the communication openings  281  and the container-side-filter  279  are connected by the foam  282 . 
     In the present embodiment, the porous member is provided in the outermost surface of the liquid supply part  280 . Thus, for the capillary force or the bubble point pressure, the property of the container-side-filter  279  may be set in the same manner as the container-side-filter  273  of the first embodiment. Further, for the meniscus pressure PBf of the second embodiment and the Third embodiment, a biasing force F applying from the biasing member  274  to the container-side-filter  273  can be applied by replacing to the biasing force F applying from the foam  282  to the container-side-filter  279 . That is, in a state in which the biasing force F is replaced to the biasing force F applying from the foam  282  to the container-side-filter  279 , the same effects of the second embodiment and the Third embodiment can be obtained by setting the meniscus pressure PBf of the container-side-filter  279  in the same manner as the setting in the second embodiment and the Third embodiment. 
     According to the cartridge  20 B of the fifth embodiment, since the liquid supply part  280  includes the flow channel formation member (foam  282 ) provided in the space inside the container-side-cylindrical-body  288  and the porous member in container side provided in the top end  288   a  (end part of the −Z-axis direction) of the container-side-cylindrical-body  288 , the structure of the cartridge  20 B can be simplified. 
     Further, according to the cartridge  20 B of the fifth embodiment, the container-side-filter  279  is fixed in the top end  288   a  (end part of the −Z-axis direction) of the container-side-cylindrical-body  288 . Therefore, for example, even when the container-side-filter  279  is broken or damaged, it can be easily replaced to a new filter. Therefore, the cartridge  20 B can be continuously used for a long term. 
     F. Sixth Embodiment 
     A cartridge  20 F according to the sixth embodiment will be described. According to the sixth embodiment, for the same structure of the first embodiment, the same symbols of the first embodiment are allotted and the detailed descriptions are omitted. 
     In the cartridge  20 F, as shown in  FIG. 20 , the case  22  includes the first case  751  and the second case  752 . In the present embodiment, the outer shell of the cartridge  20 F is configured by the first case  751  and the second case  752 . As shown in  FIG. 21 , the first case  751  includes the first wall  761 , the second wall  762 , the third wall  763 , the fourth wall  764 , the fifth wall  765 , the sixth wall  766 , and the seventh wall  767 . The second wall  762  to the seventh wall  767  are respectively intersected with the first wall. The second wall  762  to the seventh wall  767  are projected in a direction from the first wall  761  to the +Y-axis direction side, that is, a direction from the first wall  761  to the second case  752  side. 
     The second wall  762  and the third wall  763  are positioned to stand face to face to each other through the first wall  761  in the Z-axis direction. The fourth wall  764  and the fifth wall  765  are positioned to stand face to face to each other through the first wall  761  in the X-axis direction. The fourth wall  764  and the fifth wall  765  are respectively intersected to the third wall  763 . Further, the fourth wall  764  is intersected to the second wall  762  in the opposite side from the third wall  763  side. 
     The sixth wall  766  is intersected with the fifth wall  765  in the second wall  762  side of the fifth wall  765  in the Z-axis direction, that is, in the opposite side from the third wall  763  side of the fifth wall  765 . The seventh wall  767  is intersected with the sixth wall  766  in the opposite side from the fifth wall  765  side of the sixth wall  766 . Further, the seventh wall  767  is intersected with the second wall  762  in the opposite side from the fourth wall  764  side of the second wall  762 . The sixth wall  766  is inclined with respect to each of the fifth wall  765  and the second wall  762 . The sixth wall  766  is inclined in a direction closer to the fourth wall  764  as approaching from the third wall  763  side to the second wall  762  side. 
     According to the aforementioned structure, the first wall  761  is surrounded by the second wall  762  to the seventh wall  767 . The second wall  762  to the seventh wall  767  are projected in a direction from the first wall  761  to the +Y-axis direction. Therefore, the first case  751  is configured in a recessed shape by the second wall  762  to the seventh wall  767  and by forming the first wall  761  as a bottom. The recessed part  768  is configured by the first wall  761  to the seventh wall  767 . The recessed part  768  is provided to be recessed in the −Y-axis direction. The recessed part  768  opens in the +Y-axis direction, that is, a direction of the second case  752  side. The recessed part  765  is covered by the sheet member  784  which will be described later. The ink is stored inside the recessed part  768  covered by the sheet member  784 . Therefore, the recessed part  768  functions as the storage section of the ink. Hereinafter, the surface of the inside of the recessed part  768  is sometimes indicated as an inner surface  769 . 
     As shown in  FIG. 22 , in the first case  751 , a welding part  771  along the outline of the recessed part  768  is provided. The welding part  771  is provided along the second wall  762  to the seventh wall  767 , and the sheet member  784  is the part to be welded. Further, in the first case  751 , a partition wall  772  that partitions the recessed part  768  into the first recessed part  768 A and the second recessed part  768 B. The welding part  771  is also provided in the partition wall  772 . In  FIG. 22 , in order to simplify the configuration, a hatching is provided to the welding part  771 . A region surrounded by the third wall  763 , the fifth wall  765 , the seventh wall  767 , a part of the second wall  762 , a partition wall  772 , and a part of the fourth wall  764  within the recessed part  768  is defined as the first recessed part  768 A. Further, a region surrounded by another part of the second wall  762 , the partition wall  772 , and another part of the fourth wall  764  within the recessed part  768 , that is, the region except the region from the recessed part  768  to the first recessed part  768 A, is defined as the second recessed part  768 B. 
     Further, as shown in  FIG. 21 , in the second wall  762 , the communication openings  281  penetrating through between the inside of the recessed part  768  and the outside of the first case  751  is provided. The ink stored in the recessed part  768  is discharged to the outside of the cartridge  20 F from the communication opening  281 . Further, as shown in  FIG. 23A , in the opposite side from the recessed part  768  side of the second wall  762 , that is, the outside of the second wall  762 , the container-side-cylindrical-body  288  surrounding the communication opening  281  is provided. The container-side-cylindrical-body  288  projects from the second wall  762  in a direction of the opposite side (−Z-axis direction side) of the third wall  763  side. The container-side-cylindrical-body  288  surrounds the communication openings  281  from the outside. 
     In the fourth wall  764 , the second projecting part  220  is provided. The second projecting part  220  projects from the fourth wall  764  in a direction of the opposite side (+X-axis direction side) of the fifth wall  765  side. The second projecting part  220  is positioned between the second wall  762  and the third wall  763  in the Z-axis direction. The second projecting part  220  is fitted in the recessed part  620  as shown in  FIG. 2  in a state in which the cartridge  20 F is mounted on the holder  60 . Further, as shown in  FIG. 23B , the first projecting part  210  is provided in the fifth wall  765 . The first projecting part  210  projects from the fifth wall  765  in a direction of the opposite side (+X-axis direction side) of the fourth wall  764  side. The first projecting part  210  is locked by the lever  80  shown in  FIG. 2  in a state in which the cartridge  20 F is mounted on the holder  60 . With this, the cartridge  20 F is fixed on the holder  60 . In the second wall  762 , a communication hole  777  is provided within the region surrounded by the container-side-cylindrical-body  288  and the region outside the communication opening  281 . The communication hole  777  penetrates between the inside of the recessed part  768  and the outside of the first case  751 . 
     Further, as shown in  FIG. 21 , the cartridge  20 F includes a valve unit  781 , a coil spring  782 , a pressure receiving plate  783 , and a sheet member  784 . The sheet member  784  has flexibility and is formed by a synthetic resin (e.g., nylon, polypropylene, etc.). The sheet member  784  is provided in the first case  751  side of the second case  752 . The sheet member  784  is bonded to the welding part  771  of the first case  751 . In the present embodiment, the sheet member  784  is bonded to the welding part  771  by welding. With this, the recessed part  768  of the first case  751  is closed by the sheet member  784 . A region surrounded by the recessed part  768  and the sheet member  784  is called as the liquid storage part  785 . The ink is stored in the recessed part  768  closed by the sheet member  784 , that is, the inside of the liquid storage part  785 . Therefore, in the present embodiment, the sheet member  784  configures a part of the wall of the liquid storage part  785 . 
     As shown in  FIG. 22 , as described above, in the first case  751 , the recessed part  768  is partitioned into the first recessed part  768 A and the second recessed part  768 B by the partition wall  772 . Therefore, when the sheet member  784  is bonded to the welding part  771 , the liquid storage part  785  is partitioned into the first liquid storage part  785 A and the second liquid storage part  785 B. The first liquid storage part  785 A corresponds to the first recessed part  768 A. The second liquid storage part  785 B corresponds to the second recessed part  768 B. As described above, the sheet member  784  has flexibility. Therefore, the volume of the first liquid storage part  785 A can be changed. The sheet member  784  is bonded to the first case  751  in a state in which it is pressed and stretched along the inner surface  769  of the recessed part  768  in advance so as to easily follow the change of the volume of the first liquid storage part  785 A. 
     As shown in  FIG. 21 , the coil spring  782  is provided in the first case  751  side of the sheet member  784 , and is stored in the recessed part  768 . The coil spring  782  is wound in a cylindrical shape. In  FIG. 21 , the coil spring  782  is simplified. A pressure receiving plate  783  is provided to the sheet member  784  side of the coil spring  782 . That is, the pressure receiving plate  783  is existed between the coil spring  782  and the sheet member  784 . The lower bottom part of the coil spring  782  abuts to the first wall  761 . The upper bottom part of the coil spring  782  abuts to the surface of the opposite side from the surface of the sheet member  784  side of the pressure receiving plate  783 . Further, the upper bottom part of the coil spring  782  abuts to approximately central part of the pressure receiving plate  783 . The pressure receiving plate  783  is formed by metals such as synthetic resin or stainless of polypropylene, etc. 
     The coil spring  782  biases the pressure receiving plate  783  in the direction of the sheet member  784  side. In other words, the coil spring  782  biases the pressure receiving plate  783  in the +Y-axis direction. That is, the coil spring  782  biases the pressure receiving plate  783  in a direction in which the volume of the liquid storage part  785  expands. The second case  752  is provided in the opposite side from the pressure receiving plate  783  side of the sheet member  784 . The second case  752  is fitted to the first case  751  to cover the sheet member  784 . With this, the sheet member  784  is protected from the outside. 
     A valve unit  781  is provided inside the recessed part  768 . The sheet member  784  covers the recessed part  768  in each of the valve unit  781 . In the part overlapping to the valve unit  781  of the sheet member  784 , an air hole  791  is formed. The air hole  791  is closed by the valve unit  781 . Further, in the second case  752 , an atmosphere communication hole  792  is provided. The space between the sheet member  784  and the second case  752  communicates to the outside of the cartridge  20 F via the atmosphere communication hole  792 . Therefore, the air is existed in the space between the sheet member  784  and the second case  752 . 
     A space between the sheet member  783  and the second case  752  is called as an atmospheric chamber  793 . The atmosphere communication hole  792  communicates to the atmospheric chamber  793 . In the present embodiment, the communication hole  777  communicates to the atmospheric chamber  793 . That is, the space surrounded by the container-side-cylindrical-body  288  communicates to the atmosphere communication hole  792  from the communication hole  777  via the atmospheric chamber  793 . 
     When the ink in the liquid storage part  785  is reduced, the valve unit  781  becomes an open state, so that the air hole  791  is opened. Therefore, the air outside the cartridge  20 F may be flowed to the inside of the liquid storage part  785  through the atmosphere communication hole  792 , the atmospheric chamber  793 , and the air hole  791 . By flowing the air into the liquid storage part  785 , when the pressure reduction of the liquid storage part  785  is reduced, the valve unit  781  becomes a close state. Therefore, the air hole  791  is closed by the valve unit  781 . With such operation, the pressure of the liquid storage part  785  may maintain in an appropriate pressure range for appropriately supplying the ink to the print head  540 . 
     Further, as shown in  FIG. 21 , the cartridge  20 F includes a prism  794  and a sheet member  795 . Here, as shown in  FIG. 24 , in the second wall  762  of the first case  751 , an opening part  796  is provided. The inside of the first case  751  and the outside of the first case  751  are communicated via the opening part  796 . The prism  794  is provided in a position overlapping the opening part  796  and has a size to cover the opening part  796 . The opening part  796  is closed from the outside of the first case  751  by the prism  794 . As shown in  FIG. 25 , the prism  794  projects to the inside of the first case  751  from the outside of the first case  751  via the opening part  796 . In the present embodiment, the opening part  796  is closed by the prism  794 , so that the leakage of the ink inside the liquid storage part  785  from the opening part  796  is suppressed. Thus, the prism  794  is configured as a part of the inner surface  769  of the liquid storage part  785 . Therefore, the prism  794  is deemed as a part of the first case  751 . 
     The prism  794  functions as a liquid detection section to optically detect whether or not the ink is existed. The prism  794  is a material having light permeability and being formed by, for example, synthetic resin of polypropylene, etc. The material configuring the prism  794  may be any material as long as it has appropriate light permeability so that it does not have to be transparent. For example, whether or not the ink is existed inside the liquid storage part  785  is detected as follows. An optical sensor provided with a light emitting element and a light receiving element is provided in the printer  50 . The light is emitted from light emitting element to the prism  794 . When the ink is existed in the peripheral of the prism  794 , the light passes through the prism  794 , and is directed to the inside of the liquid storage part  785 . On the other hand, when the ink is not existed in the peripheral of the prism  794 , the light emitted from the light emitting element is reflected by the two reflection surfaces of the prism  794  so as to reach the light receiving element. Based on whether or not the light reaches to the light receiving element, the printer  50  determines whether or not the ink is existed inside the liquid storage part  785 . The existence or non-existence of the ink is determined by the control unit  510 . 
     Further, as shown in  FIG. 24 , in the second wall  762  of the first case  751 , a recessed part  797  being recessed in a direction from the outside of the second wall  762  to the inside of the recessed part  768  is provided between the opening part  796  and the communication opening  281  in the X-axis direction. A communication hole  798  communicating to the inside of the recessed part  768  from the inside of the recessed part  797 , and a communication hole  799  are provided in the second wall  762  inside the recessed part  797 . The sheet member  795  is provided in a position overlapping to the recessed part  797  and has a size to cover the recessed part  797 . The recessed part  797  is closed from the outside of the first case  751  by the sheet member  795 . In the present embodiment, since the recessed part  797  is closed by the sheet member  795 , the leakage of the ink inside the liquid storage part  785  from the recessed part  797  is suppressed. Thus, the sheet member  795  is deemed to configure a part of the inner surface  769  of the liquid storage part  785 . Therefore, the sheet member  795  is deemed as a part of the first case  751 . 
     As shown in  FIG. 25 , a communication hole  798  communicates from the first recessed part  768 A to the inside of the recessed part  797 . The communication hole  799  communicates from the inside of the recessed part  797  to the inside of the second recessed part  768 B. That is, the first recessed part  768 A and the second recessed part  768 B communicate to each other via the communication hole  798 , the recessed part  797 , and the communication hole  799 . Therefore, the first liquid storage part  785 A and the second liquid storage part  785 B communicate to each other via the communication hole  798 , the recessed part  797 , and the communication hole  799 .  FIG. 25  shows the cross-sectional surface in the case in which the communication hole  798  and the communication hole  799  are cut in the XZ planer surface. 
     Further, as shown in  FIG. 21 , the cartridge  20 F includes a flow channel formation member  801  and a container-side-filter  273 . Here, as shown in  FIG. 24 , a recessed part  270  to be recessed from the outside of the second wall  762  to the inside of the recessed part  768  is provided inside the region surrounded by the container-side-cylindrical-body  288  and the region overlapping the communication opening  281 . As shown in  FIG. 25 , the flow channel formation member  801  is stored inside the recessed part  270  entirely. Further, the container-side-filter  273  is provided within the region surrounded by the container-side-cylindrical-body  288  and covers the recessed part  270  from the outside of the second wall  762 . The volume of the flow channel formation member  801  is greater than the volume of the foam  272 . Further, the ink amount storable in the flow channel formation member  801  is greater than the ink amount storable in the foam  272 . Further, as the flow channel formation member  801 , other than the same material as the foam  272 , various materials can be employed as long as any materials such that the bubble point pressure is lower than the bubble point pressure of the container-side-filter  273 . For example, non-woven fabric materials including polyethylene or polypropylene or foamed plastic materials such as polyurethane, etc. may be used. 
     As shown in  FIG. 24 , in the opposite side from the recessed part  768  side of the sixth wall  766 , that is, the outside of the sixth wall  766 , a circuit substrate  40  is provided. The circuit substrate  40  extends along the sixth wall  766 . Therefore, the circuit substrate  40  is inclined with respect to each of the second wall  762  and the fifth wall  765 . The circuit substrate  40  is inclined in a direction closer to the fourth wall  764  as approaching from the third wall  762  side to the second wall  762  side. 
     As shown in  FIG. 26 , the cartridge  20 F having the aforementioned structure is fixed in a position by the lever  80  in the state of being mounted on the holder  60 . At this time, the second projecting part  220  is engaged with the recessed part  620 , and the first projecting part  210  is engaged with the lever  80 . When the cartridge  20 F is mounted on the holder  60 , the container-side-cylindrical-body  288  abuts to the elastic member  648 , and the device-side-cylindrical-body  645  is inserted in the region surrounded by the container-side-cylindrical-body  288 . That is, the container-side-cylindrical-body  288  surrounds the ink flow channel  646  from the outside farther than the device-side-cylindrical-body  645 . In the region surrounded by the container-side-cylindrical-body  288 , the container-side-filter  273  contacts with the device-side-filter  642 . Therefore, the ink in the liquid storage part  785  can be supplied from the device-side-filter  642  to the ink flow channel  646  via the flow channel formation member  801  and the container-side-filter  273  from the communication openings  281 . 
     At this time, the container-side-cylindrical-body  288  abuts to the elastic member  648  in a state in which it surrounds the ink flow channel  646  from the outside father than device-side-cylindrical-body  645 . Therefore, the airtightness of the space surrounded by the container-side-cylindrical-body  288  and the elastic member  648  is enhanced. With this, when the ink is supplied from the cartridge  20 F to the ink flow channel  646 , the ink leaking to the outside of the region surrounded by the device-side-cylindrical-body  645  is blocked by the elastic member  648  and the container-side-cylindrical-body  288 . 
     The ink flow in the cartridge  20 F of the present embodiment and the airflow will be described. As shown in  FIG. 27A , in the cartridge  20 F, the ink  803  is stored in the liquid storage part  785  partitioned by the first case  751  and the sheet member  784 . The liquid storage part  785  is partitioned into the first liquid storage part  785 A and the second liquid storage part  785 B by the partition wall  772 . The valve unit  781  ( FIG. 21 ) is provided inside the liquid storage part  785 . The valve unit  781  includes a cover valve  805 , a lever valve  807 , and a spring member  809  as shown in  FIG. 27A . 
     In the cover valve  805 , an atmosphere introduction port  810  is provided. The atmosphere introduction port  810  penetrates through the cover valve  805 . In the cartridge  20 F, the atmosphere introduction port  810  functions as a communication passage to communicate between the inside of the first liquid storage part  785 A and the atmospheric chamber  793  in the outside of the liquid storage part  785 . A lever valve  807  is provided in the opposite side from the second case  752  side of the cover valve  805 . The lever valve  807  includes a valve part  811  and a lever part  812 . The valve part  811  overlaps with the atmosphere introduction port  810  of the cover valve  805 . The lever part  812  extendedly exists in the region between the pressure receiving plate  783  and the inner surface  769  of the first wall  761 . The spring member  809  is provided in the opposite side from the cover valve  805  side of the lever valve  807 . The spring member  809  biases the valve part  811  of the lever valve  807  in a direction of the cover valve  805  side. Therefore, the atmosphere introduction part  810  of the cover valve  805  is closed by the valve part  811 . Hereinafter, the state in which the atmosphere introduction port  810  is closed by the valve part  811  represents as the close state of the valve unit  781 . 
     When the ink  803  in the liquid storage part  785  is consumed, as shown in  FIG. 27B , the pressure receiving plate  783  displaces toward the inner surface  769  side of the first wall  761 . When the pressure receiving plate  783  displaces toward the inner surface  769  side of the first wall  761 , the pressure receiving plate  783  presses the lever part  812  toward the inner surface  796  side of the first wall  761 . Therefore, the posture of the valve part  811  displaces, and a gap between the valve part  811  and the cover bulb  805  is generated. With this, the atmosphere introduction port  810  and the first liquid storage part  785 A are communicated. Hereinafter, the state in which the atmosphere introduction port  810  and the liquid storage part  785  are communicated by generating a gap between the valve part  811  and the cover bulb  805  represents as the open state of the valve unit  781 . When the valve unit  781  becomes the open state, the air of the atmospheric chamber  793  in the outside of the liquid storage part  785  is flowed into the inside of the first liquid storage part  785 A through the atmosphere introduction port  810 . 
     When the air is flowed into the inside of the first liquid storage part  785 A through the atmosphere introduction port  810 , the pressure receiving plate  783  displaces toward the second case  752  side as shown in  FIG. 27C . That is, the volume of the first liquid storage part  785 A increases in compared with the condition shown in  FIG. 27B  by flowing the air to the inside of the first liquid storage part  785 A through the atmosphere introduction port  810 . With this, the negative pressure inside the liquid storage part  785 A is reduced (approaching the atmospheric pressure). When the certain amount of air is entered into the first liquid storage part  785 A, the pressure receiving plate  783  is separated from the lever part  812 . With this, the valve part  811  closes the atmosphere introduction port  810 . That is, the valve unit  781  becomes the close state. The lever valve  807  temporarily becomes the open state when the negative pressure inside liquid storage part  785  becomes large in accordance with the consumption of the ink  803  in the liquid storage part  785 , so that it is possible to maintain the pressure inside the liquid storage part  785  within an appropriate pressure range. 
     In the present embodiment, the communication hole  777  communicates to the atmospheric chamber  793  through the second wall  762  of the first case  751  from the inside of the region surrounded by the container-side-cylindrical-body  288 . That is, the inside of the region surrounded by the container-side-cylindrical-body  288  and the atmospheric chamber  793  are communicated through the communication hole  777 . The atmospheric chamber  793  communicates to the atmosphere communication hole  792  through the gap between the second case  752  and the sheet member  784 . Therefore, the inside of the region surrounded by the container-side-cylindrical-body  288  communicates to the outside of the first case  751  through the inside of the first case  751 . Accordingly, when the inside of the region surrounded by the container-side-cylindrical-body  288  is sealed from the outside of the cartridge  20 F, the difference between the pressure inside the region surrounded by the container-side-cylindrical-body  288  and the pressure (atmospheric pressure) of the outside of the first case  751  can be reduced. 
     In the present embodiment, when the cartridge  20 F is mounted on the printer  50 , in the inside of the holder  60 , it becomes a state in which the region surrounded by the container-side-cylindrical-body  288  is sealed. In a state in which the region surrounded by the container-side-cylindrical-body  288  is sealed, the container-side-filter  273  inside the region surrounded by the container-side-cylindrical-body  288  abuts to the device-side-filter  642  ( FIG. 2 ) of the printer  50  side. Therefore, the leakage of the ink  803  to the outside from the inside of the region surrounded by the container-side-cylindrical-body  288  can be suppressed. In the case the region surrounded by the container-side-cylindrical-body  288  is sealed when the cartridge  20 F is mounted on the printer  50 , the pressure inside the region surrounded by the container-side-cylindrical-body  288  sometimes becomes high. At this time, by rising the pressure inside the region surrounded by the container-side-cylindrical-body  288 , the air inside the region surrounded by the container-side-cylindrical-body  288  is sometimes flowed into the inside of the liquid storage part  785  through the container-side-filter  273 . When the air is flowed into the inside of the liquid storage part  785 , it seems that the flowed air becomes air bubble and reaches to the print head  540 . When the air bubble is entered inside the print head  540 , the ejection capability of the ink  803  is reduced by the air bubble. 
     For such problem, in the present embodiment, the inside of the region surrounded by the container-side-cylindrical-body  288  communicates to the outside of the first case  751  through the communication hole  777 , the atmospheric chamber  793 , and the atmosphere communication hole  792 . Therefore, in the case in which the region surrounded by the container-side-cylindrical-body  288  is sealed when the cartridge  20 F is mounted on the printer  50 , even when the pressure inside the region surrounded by the container-side-cylindrical-body  288  becomes high, the air inside the region surrounded by the container-side-cylindrical-body  288  can be released to the outside of the first case  751  through the communication hole  777 , the atmospheric chamber  793 , and the atmosphere communication hole  792 . Further, for example, when the pressure of the space surrounded by the container-side-cylindrical-body  288  is raised by the air expansion due to the temperature changes, the air in the space surrounded by the container-side-cylindrical-body  288  can be released to the outside of the cartridge  20 F. With this, the difference between the pressure inside the region surrounded by the container-side-cylindrical-body  288  and the pressure (atmospheric pressure) of the outside of the first case  751  can be reduced. As a result, the ejection capability of the ink in the print head  540  can be easily maintained. 
     Further, in the present embodiment, even when the empty of the ink remaining amount inside the first liquid storage part  785 A is determined through the prism  7 , the second liquid storage part  785 B is provided, so that the ink remained inside the second liquid storage part  785 B can be used to continue printing for a certain period of time. 
     In the present embodiment, when the ink inside the first liquid storage part  785 A ( FIG. 27C ) is reduced, the air is flowed into the inside of the first liquid storage part  785 A through the atmosphere introduction port  810 . At this time, it seems that the air flowed into the inside of the first liquid storage part  785 A may be flowed into the inside of the second liquid storage part  785 B through the recessed part  797  as the air bubble. Further, it seems that the air bubble flowed into the inside of the second liquid storage part  785 B may be entered to the recessed part  270  through the communication opening  281  ( FIG. 25 ). At this time, in the case in which the plate spring  271  and the foam  272  according to the first embodiment are employed instead of the flow channel formation member  801  provided inside the recessed part  270 , the air bubble is easily accumulated inside the recessed part  270 . Therefore, in the configuration of the plate spring  271  and the foam  272  according to the first embodiment, the ink flow from the first liquid storage part  785 A to the container-side-filter  273  is easily stopped by the air bubble entered inside the recessed part  270 . As a result, even though the ink is still remained inside the first liquid storage part  785 A, it seems that the ink may not be supplied to the print head  540 . 
     For such problem, in the sixth embodiment, the flow channel formation member  801  inside the recessed part  270  is provided, so that even when the air bubble is flowed into the inside of the second liquid storage part  785 B, the ink is easily supplied to the print head  540 . This is because the volume in which the air inside the recessed part  270  can be existed as the air bubble is smaller than the configuration of the plate spring  271  and the foam  272 , or the retainable ink amount in the flow channel formation member  801  is greater than the retainable ink amount in the foam  272 , etc. 
     As shown in  FIG. 28 , even when the air bubble  813  is flowed into the inside of the second liquid storage part  785 B, the ink  803  stored in the flow channel formation member  801  can be supplied to the print head  540  for a certain period of time. When the ink  803  stored in the flow channel formation member  801  is supplied to the print head  540 , as shown in  FIG. 29 , the air bubble inside the second liquid storage part  785 B is absorbed to the inside of the flow channel formation member  801  from the +Z-axis direction side of the flow channel formation member  801  in a gas state. Then, the volume of the air bubble  813  inside the second liquid storage part  785 B becomes smaller. With this, the ink  803  is injected into the inside of the second liquid storage part  785 B from the first liquid storage part  785 A side. The ink  803  injected inside the second liquid storage part  785 B reaches to the flow channel formation member  801 , so that the ink flow from the first liquid storage part  785 A to the container-side-filter  273  is recovered. 
     That is, even when the ink flow from the first liquid storage part  785 A to the flow channel formation member  801  is stopped by entering the air bubble inside the second liquid storage part  785 B, while the ink stored in the flow channel formation member  801  is supplied to the print head  540 , the ink flow from the first liquid storage part  785 A to the flow channel formation member  801  is easily recovered. Therefore, in the sixth embodiment, it is hard to stop the ink supply to the print head (the ink supply to the print head is easily maintained) even when the air bubble is flowed into the inside of the second liquid storage part  785 B. Further, in the sixth embodiment, since the flow channel formation member  801  is fully stored inside the recessed part  270 , it easily prevents the air as the air bubble from flowing into the inside of the recessed part  270  through the inside of the container-side-cylindrical-body  288  from the outside of the cartridge  20 F. 
     G. Seventh Embodiment 
     A cartridge  20 G according to the seventh embodiment will be described. As shown in  FIG. 30 , the cartridge  20 G according to the seventh embodiment has the same configuration as the cartridge  20 F according to 6 th  embodiment except a groove  821  is provided as an example of a capillary force generation configuration. Therefore, hereinafter, for the same structure of the sixth embodiment, the same symbols of the sixth embodiment are allotted, and the detailed descriptions are omitted. 
     The groove  821  is provided in the first case  751 . In the first case  751 , the groove  821  is provided in the second recessed part  768 B (second liquid storage part  785 B). The groove  821  extendedly exists along the second wall  762  from the position overlapping with the communication hole  799  to the position being a flow communication capability with the flow channel formation member  801 . In the second recessed part  768 B (second liquid storage part  785 B), a projecting part  823  is provided along the X-axis direction between the partition wall  772  to the second wall  762 . In the present embodiment, the projection amount of the projecting part  823  from the inner surface  769  is smaller than the projection amount of the partition wall  772  or the second wall  762  from the inner surface  769 . 
     The projecting part  823  is projected toward the +Y-axis direction side from the inner surface  769  of the first wall  761 , that is, from the inner surface  769  of the first wall  761  to the second case  752  ( FIG. 21 ) side. The region between the projecting part  823  and the second wall  762  in the Z-axis direction is configured as the groove  821 . By the groove  821 , the capillary force applies to the ink inside the groove  821 . With this, the ink inside the second recessed part  768 B (second liquid storage part  785 B) can be easily guided from the communication hole  799  side to the flow channel formation member  801  side along the groove  821 . Therefore, the ink inside the second recessed part  768 B (second liquid storage part  785 B) can be easily guided to the flow channel formation member  801 . As a result, in the seventh embodiment, even when the air bubble is flowed into the inside of the second liquid storage part  785 B, it is hard to further stop the ink supply to the print head  540  (the ink supply to the print head  540  is easily maintained). 
     H. Eighth Embodiment 
     The cartridge  20 H according to the eighth embodiment will be described. As shown in  FIG. 31 , the cartridge  20 G according to the eighth embodiment has the same configuration of the cartridge  20 F according to the sixth embodiment except the flow channel formation member  801  inside recessed part  270  extends to the second recessed part  768 B. Therefore, hereinafter, for the same structure of the sixth embodiment, the same symbols of the sixth embodiment are allotted, and the detailed descriptions are omitted. 
     In the eighth embodiment, in the first case  751 , the recessed part  270  communicates to the second recessed part  768 B (second liquid storage part  785 B) in the same opening size of the recessed part  270 . That is, the communication opening  281  has the same size of the opening size of the recessed part  270 . The flow channel formation member  801  stored in the recessed part  270  extends from the inside of the recessed part  270  to the inside of the second recessed part  768 B. That is, in the present embodiment, the flow channel formation member  801  is provided across the recessed part  270  and the second recessed part  768 B. 
     Here, as shown in  FIG. 32 , the flow channel formation member  801  may be divided into the first part  801 A and the second part  801 B. The first part  801 A is a part positioned inside the recessed part  270  within the flow channel formation member  801 . The second part  801 B is a part positioned inside the second recessed part  768 B (second liquid storage part  785 B) within the flow channel formation member  801 . In  FIG. 32 , in order to simplify the configuration, the hatching type of the first part  801 A and the second part  801 B of the flow channel formation member  801  is changed. 
     Further, the second recessed part  768 B (second liquid storage part  785 B) is divided into the first part  827  and the second part  829 . The first part  827  is the region occupied by the first part  801 A of the flow channel formation member  801  within the second recessed part  768 B (second liquid storage part  785 B). The second part  829  is the region upstream side father than the first part  827 , that is, the recessed part  797  side farther than the first part  827 . 
     In the eighth embodiment, the first part  801 A of the flow channel formation member  801  is positioned inside the recessed part  270 , and the second part  801 B of the flow channel formation member  801  is positioned in the first part  827  of the second recessed part  768 B (second liquid storage part  785 B). In the eighth embodiment, even though the air bubble is flowed into the inside of the second liquid storage part  785 B, the ink is easily supplied to the print head  540  as compared with the sixth embodiment. This is because the volume in which the air inside the second recessed part  768 B (second liquid storage part  785 B) can be existed as the air bubble is smaller than the volume in the sixth embodiment, or the retainable ink amount in the flow channel formation member  801  is greater than the retainable ink amount in the sixth embodiment. As a result, in the eighth embodiment, even though the air bubble is flowed into the inside of the second liquid storage part  785 B, it is hard to further stop the ink supply to the print head  540  (the ink supply to the print head  540  is easily maintained). 
     In the present embodiment, the first part  801 A and the second part  801 B are configured in one flow channel formation member  801 , but the structure of the flow channel formation member  801  is not limited to this. The flow channel formation member  801  may be configured in a plurality of flow channel formation members. In this case, for example, the second part  801 B of the flow channel formation member  801  may be configured in another flow channel formation member (second flow channel formation member) which is different from the flow channel formation member  801 . In this case, the flow channel formation member  801  is separately configured in the first part  801 A and the second part  801 B. 
     At this time, in  FIG. 32 , the second part  801 B of the recessed part  270  may be arranged in the manner in which the flow can be communicated with the first part  801 A of the flow channel formation member  801 . Therefore, in the present embodiment, it is not limited to the structure shown in  FIG. 32 , and it is not necessary to extendedly exist the second part  801 B of the flow channel formation member  801  across the first part  827  of the second recessed part  768 B (second liquid storage part  785 B), so that it may be a configuration in which it is existed in a partial position of the first part  827  of the second recessed part  768 B. Further, it may be a configuration in which a part of the second part  801 B of the flow channel formation member  801  is positioned in the first part  827  of the second recessed part  768 B, and another part is positioned in the second part  829  of the second recessed part  768 B (second liquid storage part  785 B). Therefore, the second part  801 B of the flow channel formation member  801  can be relatively and freely arranged in the first part  827  of the second recessed part  768 B. 
     I. Ninth Embodiment 
     A cartridge  20 I according to the ninth embodiment will be described. As shown in  FIG. 33 , the cartridge  20 I according to the ninth embodiment has the same configuration as the cartridge  20 H according to the eighth embodiment except a groove  831  as an example of a capillary force generation configuration is provided. Therefore, hereinafter, for the same structure of the eighth embodiment, the same symbols of the eighth embodiment are allotted, and the detailed descriptions are omitted. 
     The groove  831  is provided in the first case  751 . In the first case  751 , the groove  831  is provided inside the second part  829  within the inside of the second recessed part  768 B (second liquid storage part  785 B). The groove  831  extendedly exists from the position overlapping with the communication hole  799  to the position of the flow channel formation member  801 . The flow channel formation member  801  contacts with the groove  831 . In the second part  7688  (second liquid storage part  785 B), a projecting part  833  is provided along the X-axis direction between the partition wall  772  and the second wall  762 . In the present embodiment, the projection amount of the projecting part  833  from the inner surface  769  is smaller than the projection amount of the partition wall  772  and the second wall  762  from the inner surface  769 . 
     The projecting part  833  is projected toward the +Y-axis direction side from the inner surface  769  of the first wall  761 , that is, the second case  752  ( FIG. 21 ) side from the inner surface  769  of the first wall  761 . The region between the projecting part  833  and the second wall  762  in the Z-axis direction is configured as the groove  831 . By the groove  831 , the capillary force affects to the ink inside the groove  831 . With this, the ink inside the second recessed part  768 B (second liquid storage part  785 B) can be easily guided along the groove  831  from the communication hole  799  side to the flow channel formation member  801  side. Since the flow channel formation member  801  contacts with the groove  831 , the ink inside the second recessed part  768 B (second liquid storage part  785 B) can be easily guided to the flow channel formation member  801 . As a result, in the ninth embodiment, even when the air bubble is flowed into the inside the second liquid storage part  785 B, it is hard to further stop the ink supply to the print head  540  (the ink supply to the print head  540  is easily maintained). 
     J. Tenth Embodiment 
     A cartridge  20 J according to the tenth embodiment will be described. As shown in  FIG. 34 , the cartridge  20 I according to the tenth embodiment has the same structure as the cartridge  20 H according to the eighth embodiment except the second flow channel formation member  837  as an example of the capillary force generation configuration is provided. Therefore, hereinafter, for the same structure of the eighth embodiment, the same symbols of the eighth embodiment are allotted, and the detailed descriptions are omitted. 
     The second flow channel formation member  837  is provided in the first case  751 . In the first case  751 , the second flow channel formation member  837  is provided inside the second part  829  within the inside of the second recessed part  768 B (second liquid storage part  785 B). The second flow channel formation member  837  is provided across the inside of the second part  829  within the inside of the second recessed part  768 B (second liquid storage part  785 B). The second flow channel formation member  837  extendedly exists from the position overlapping with the communication hole  799  to the position of the flow channel formation member  801 . The flow channel formation member  801  contacts with the second flow channel formation member  837 . As the second flow channel formation member  837 , the same material as the flow channel formation member  801  can be employed. 
     The capillary force affects to the ink inside the second part  829  by the second flow channel formation member  837 . With this, the ink inside the second recessed part  768 B (second liquid storage part  785 B) can be easily guided from the communication hole  799  side to the flow channel formation member  801  side along the second flow channel formation member  837 . Since the flow channel formation member  801  contacts with the second flow channel formation member  837 , the ink inside the second recessed part  769 B (second liquid storage part  785 B) can be easily guided to the flow channel formation member  801 . Further, since the second part  829  is occupied by the second flow channel formation member  837 , a space in which the air can be existed as the air bubble is not provided in the first part  827  and the second part  829  in the second recessed part  768 B (second liquid storage part  785 B). Therefore, in the tenth embodiment, the air bubble flowing into the first part  827  and the second part  829  can be suppressed. Therefore, in the tenth embodiment, it is hard to further stop the ink supply to the print head  540  (the ink supply to the print head  540  is easily maintained). 
     On the other hand, for example, when the air bubble is flowed into the inside of the second liquid storage part  785  in the cartridge  20 F, the volume of the second liquid storage part  785 B cannot be effectively used. When the air bubble is flowed into the inside of the second liquid storage part  785 B, the retainable ink amount inside the second liquid storage part  785 B is reduced by the volume of the air bubble inside the second liquid storage part  785 B. Therefore, when the air bubble is flowed into the inside of the second liquid storage part  785 B, the volume of the second liquid storage part  785 B cannot be effectively used. When such problem occurs, the period of time in which the printing can be continued from the time when the empty of the ink remaining amount inside the first liquid storage part  785 A was detected through the prism  794  (hereinafter referred to as continuing period) becomes short. However, for such problem, in the tenth embodiment, since the air bubble flowing into the first part  827  and the second part  829  can be suppressed, this easily avoids the occurrence in which the continuing period becomes short. With this, in the tenth embodiment, the variations of the continuing periods can be reduced. 
     K. Eleventh Embodiment 
     A cartridge  20 K according to the eleventh embodiment will be described. As shown in  FIG. 35 , the cartridge  20 K according to the eleventh embodiment omits the second recessed part  768 B (second liquid storage part  785 B), the communication hole  798 , the communication hole  799 , and the recessed part  797  ( FIG. 33 ) according to the ninth embodiment. Except this point, the cartridge  20 K according to the eleventh embodiment has the same structure as the cartridge  20 I according to the ninth embodiment. Therefore, hereinafter, for the same structure as the ninth embodiment, the same symbols of the ninth embodiment are allotted, and the detailed descriptions are omitted. In the present embodiment, by omitting the partition wall  772  ( FIG. 33 ) according to the ninth embodiment, the second recessed part  768 B (second liquid storage part  785 B) according to the ninth embodiment is omitted. 
     According to the eleventh embodiment, when the empty of the ink remaining amount inside the first liquid storage part  785 A was detected through the prism  794 , a printing can be continued for a certain period of time by using the remaining ink inside the groove  831 B and the flow channel formation member  801 . That is, in the eleventh embodiment, since the flow channel formation member  801  and the groove  831  are provided, the second liquid storage part  785 B can be omitted. The period of time in which the printing can be continued from the time when the ink remaining amount was empty can be appropriately adjusted by adjusting the path length of the groove  831 , the depth of the groove  831 , the volume of the flow channel formation member  801 , etc. 
     L. Twelfth Embodiment 
     A cartridge  20 L according to the twelfth embodiment will be described. As shown in  FIG. 36 , the cartridge  20 L according to the twelfth embodiment omits the second recessed part  768 B (second liquid storage part  785 B), the communication hole  798 , the communication hole  799 , and the recessed part  797  ( FIG. 34 ) according to the tenth embodiment. Except this point, the cartridge  20 L according to the twelfth embodiment has the same structure as the cartridge  20 J according to the tenth embodiment. Therefore, hereinafter, for the same structure as the tenth embodiment, the same symbols as the tenth embodiment are allotted, and the detailed descriptions are omitted. In the present embodiment, by omitting the partition wall  772  ( FIG. 34 ) according to the tenth embodiment, the second recessed part  768 B (second liquid storage part  785 B) according to the tenth embodiment is omitted. 
     According to the twelfth embodiment, when the empty of the ink remaining amount inside the first liquid storage part  785 A is detected through the prism  794 , the printing can be continued for a certain period of time by using the remaining ink inside the second flow channel formation member  837  and the flow channel formation member  801 . That is, in the eleventh embodiment, since the flow channel formation member  801  and the second flow channel formation member  837  are provided, the second liquid storage part  785 B can be omitted. The period of time in which the printing can be continued from the time when the ink remaining amount was empty can be appropriately adjusted by adjusting the volume of the second flow channel formation member  837 , the volume of the flow channel formation member  801 , etc. 
     M. Thirteenth Embodiment 
     As shown in  FIG. 37 , in the thirteenth embodiment, a cap  841  is added to the cartridge  20 F. In the thirteenth embodiment, for the same structure of the sixth embodiment, the same symbols as the sixth embodiment are allotted and the detailed descriptions are omitted. In a state in which the cartridge  20 F is unused, the cap  841  covers the liquid supply part  280 . The liquid supply part  280  can be shielded by the cap  841 . By shielding the liquid supply part  280  by the cap  841 , this can suppress the leakage of the ink from the liquid supply part  280  low, or this can suppress the evaporation of the liquid component of the ink from the liquid supply part  280  low. When the cartridge  20 F is mounted on the printer  50 , the operator removes the cap  841  from the liquid supply part  280  and mounts the cartridge  20 F to the printer  50 . That is, the cartridge  20 F is mounted on the printer  50  in a state in which the cap  841  is removed from the liquid supply part  280 . 
     The cap  841  includes a cover  843  and a seal member  845 . The cover  843  is formed by, for example, synthetic resin such as nylon, polypropylene, etc. A recessed part  847 , engaging pawls  849 , engaging pawls  851 , and an attachment and detachment lever  853  are provided in the cover  843 . The recessed part  847  is provided to be recessed in the −Z-axis direction. As shown in  FIG. 38 , the recessed part  847  are surrounded by the partition wall  855 , the partition wall  856 , the partition wall  857 , and the partition wall  858 . The partition wall  855  and the partition wall  856  are faced to each other in a state of providing a gap to each other in the Y-axis direction. The partition wall  857  and the partition wall  858  are faced to each other in a state of providing a gap to each other in the X-axis direction. 
     The seal member  845  is stored inside the recessed part  847 . The engaging pawls  849  are provided in the partition wall  858  side of the partition wall  857 . A gap is provided between the engaging pawls  849  and the partition wall  858 . The seal member  845  is stored between the engaging pawls  849  and the partition wall  858 . Therefore, the engaging pawls  849  are provided between the partition wall  857  and the seal member  845 . The engaging pawls  851  are provided in the opposite side from the seal member  845  side of the partition wall  858 . That is, the engaging pawls  851  are provided in the outside of the region in the recessed part  847  in a plan view. The engaging pawls  849  and the engaging pawls  851  are faced to each other through the seal member  845  and the partition wall  858  in a plan view. 
     The attachment and detachment lever  853  is provided in the opposite side from the seal member  845  side of the partition wall  858 . The attachment and detachment lever  853  extends in a leaving direction from the partition wall  858  to the outside of the recessed part  847  and in the positive Z-axis direction. The engaging pawls  851  are provided in the attachment and detachment lever  853 . As shown in  FIG. 37 , by engaging the engaging pawls  849  to the engaged part  861  of the cartridge  20 F and engaging the engaging pawls  851  to the engaged part  863  of the cartridge  20 F, the cap  841  is installed in the cartridge  20 F. 
     In a state in which the cap  841  is installed in the cartridge  20 F, as shown in  FIG. 39 , the liquid supply part  280  is covered from the outside by the cover  843  of the cap  841 . In a state that the cap  841  is installed in the cartridge  20 F, by turning the attachment and detachment lever  853  to the opposite side (−Z-axis direction) from the cartridge  20 F side, the engaging pawls  851  can be released from the engaged part  863 . With this, the cap  841  can be removed from the cartridge  20 F. In a state in which the cap  841  is mounted on the cartridge  20 F, the seal member  845  faces to the liquid supply part  280 . The seal member  845  is made of a material having elasticity such as, for example, rubber, elastomer, etc. In a state in which the seal member  845  is pressed to the container-side-cylindrical-body  288 , the liquid supply part  280  is sealed by the seal member  845 . In a state in which the liquid supply part  280  is sealed by the seal member  845 , a part where the container-side-cylindrical-body  288  of the seal member  845  contacts is recessed. Therefore, in the state in which the liquid supply part  280  is sealed by the seal member  845 , the airtightness of the liquid supply part  280  is enhanced. The space surrounded by the container-side-cylindrical-body  288  and the seal member  845  is called as a seal chamber  865 . 
     In the cartridge  20 F, as described above, the coil spring  782  ( FIG. 27A ) biases the pressure receiving plate  783  in a direction in which the volume of the first liquid storage part  785 A expands. Therefore, the pressure inside the liquid storage part  785  keeps lower than the pressure (atmospheric pressure) of the outside of the cartridge  20 F. That is, when the atmospheric pressure is defined as a reference, the pressure in the liquid storage part  785  is kept in a negative pressure. With this, the pressure inside the second liquid storage part  785 B shown in  FIG. 39  and the region surrounded by the container-side-filter  273  and the recessed part  270  is kept in a negative pressure condition. 
     On the other hand, the pressure in the seal chamber  864  is higher than the pressure in the second liquid storage part  785 B and it is the same as the approximate atmospheric pressure. Hereinafter, the space surrounded by the container-side-filter  273  and the recessed part  270  is called as a liquid supply chamber  870 . In the cartridge  20 F, the seal chamber  865  and the liquid supply chamber  870  are partitioned by the container-side-filter  273 . In the present embodiment, as a material of the container-side-filter  273 , a material having meniscus pressure greater than the difference between the pressure in the seal chamber  865  and the pressure in the liquid supply chamber  870  is employed. In a case in which PS represents the difference between the pressure in the seal chamber  865  and the pressure in the liquid supply chamber  870 , and PBf represents the meniscus pressure of the container-side-filter  273 , it is defined as the relationship of the following formula (8). With this, the leakage of the ink from the liquid supply chamber  870  to the seal chamber  865  side can be suppressed.
 
 PBf&gt;PS   (8)
 
     In a condition in which the pressure in the liquid supply chamber  870  is lower than the pressure in the case  22  and the pressure (atmospheric pressure) of the outside, it is not limited to the condition in the thirteenth embodiment, but also the same condition in each of the sixth embodiment to the twelfth embodiment. In these cases, the pressure difference PS is defined as the difference between the pressure of the outside (rather than the case  22 ) and the pressure in the liquid supply chamber  870 . The relationship of the above formula (8) is also applied to each of the sixth embodiment to the twelfth embodiment. 
     By the way, in the configuration in which two spaces having different pressures are divided by a sheet-shaped part, a phenomenon transmitting the air through the sheet-shaped part in molecular level in a direction from the space having a high pressure to the space having a low pressure may occur. In the case that the space having a low pressure is filled by the liquid, the air transmitting through the sheet-shaped part in the molecular level is collected in the liquid, and it becomes the air bubble. This phenomenon is called as bubble growth. 
     In the cartridge  20 F, when the pressure difference PS is greater than the meniscus pressure PBm of the flow channel formation member  801 , the bubble growth sometimes occurs. When the pressure difference PS is greater than the meniscus pressure PBm of the flow channel formation member  801 , the molecular of air transmitted through the filter container side  273  is collected in the flow channel formation member  801 , and the air bubble becomes a size to be stored in the hole of the flow channel formation member  801 . When the molecular of air is further collected in the flow channel formation member  801 , and when the air bubble stored in the hole of the flow channel formation member  801  is grown larger which exceeds the size of the hole, the air bubble is continuously grown while breaking the meniscus of the liquid adjacent to the air bubble. 
     Therefore, when the pressure difference PS is greater than the meniscus pressure PBm, the bubble growth easily occur in the flow channel formation member  801 . Contrarily, when the pressure difference PS is smaller than the meniscus pressure PBm, the bubble growth is easily suppressed in the flow channel formation member  801 . This is because when the pressure difference PS is smaller than the meniscus pressure PBm, the breakage of the meniscus in the flow channel formation member  801  is easily suppressed, so that the growth of the air bubble is easily prevented. Therefore, in the present embodiment, as a material of the flow channel formation member  801 , a material having the meniscus pressure PBm greater than the pressure difference PS is employed. This is shown as the relationship of the following formula (9). With this, the flowing of the air bubble into the liquid supply chamber  870  from the seal chamber  865  side can be suppressed.
 
 PBm&gt;PS   (9)
 
     Further, in the present embodiment, the relationship of the following formula (10) has the meniscus pressure PBf of the container-side-filter  273  and the meniscus pressure PBm of the flow channel formation member  801 . The meniscus pressure PBf of the container-side-filter  273  is greater than the meniscus pressure PBm of the flow channel formation member  801 , so that the pressure loss in the case of the ink supply to the print head  540  can be reduced. When the relationship between the meniscus pressure PBf of the container-side-filter  273  and the meniscus pressure PBm of the flow channel formation member  801  is organized, the relationship of the following formula (11) is shown.
 
 PBr&gt;PBm   (10)
 
 PBf&gt;PBm&gt;PS   (11)
 
     The relationships of the aforementioned formula (10) and the formula (11) are applied to each of the sixth embodiment to the twelfth embodiment. Further, from the viewpoint of reducing the pressure loss, in the cartridge  20 J of the tenth embodiment, the meniscus pressure PBm2 of the second foam  837  is preferably lower than the meniscus pressure PBm and higher than the pressure difference PS as shown in the following formula (12). Further, from the viewpoint of reducing the pressure loss, in the configuration in which the flow channel formation member  801  is separated into the first part  801 A and the second part  801 B, the relationship shown in the following formula (13) is preferable. In the formula (13), PBmA represents the meniscus pressure of the first part  801 A, and PBmB represents the meniscus pressure of the second part  801 B. This indicates that in the configuration in which the ink is guided from the liquid supply part  280  via the plurality of porous members, the meniscus pressure of the plurality of porous members is preferably lowered in a direction from the liquid supply part  280  side to the upstream side of the ink flow.
 
 PBf&gt;PBm&gt;PBm 2&gt; PS   (12)
 
 PBf&gt;PBmA&gt;PBmB&gt;PBm 2&gt; PS   (13)
 
     N. Fourteenth Embodiment 
     A cartridge  20 N according to the fourteenth embodiment has the same structure as the cartridge  20 F according to the sixth embodiment except the density of the flow channel formation member  801  is different depending on a part of the flow channel formation member  801 . Therefore, hereinafter, for the same structure as the sixth embodiment, the same symbols as the sixth embodiment are allotted and the detailed descriptions are omitted. 
     In the cartridge  20 P, as shown in  FIG. 40 , the flow channel formation member  801  may be divided into the third part  801 C and the fourth part  801 D. The third part  801 C is the part along the upper surface  270 A of the recessed part  270  in the flow channel formation member  801  and it is the part facing to the upper surface  270 A. The fourth part  801 D is the part in the side of the container-side-filter  273 , rather than the third part  801 C, in the flow channel formation member  801 . The upper surface  270 A is the surface facing to the container-side-filter  273  within the recessed part  270 . 
     In the cartridge  20 N, the ink may be existed in a gap between the fourth part  801 D and the container-side-filter  273 . The bubble growth may occur in the ink existed in the gap between the fourth part  801 D and the container-side-filter  273 . However, in the cartridge  20 N, the density of the third part  801 C is higher than the density of the fourth part  801 D. With this, the airtightness of the third part  801 C is enhanced than the airtightness of the fourth part  801 D. Therefore, even when the air bubble generated in the gap between the fourth part  801 D and the container-side-filter  273  is flowed into the inside of the flow channel formation member  801 , the growth of the air bubble, which is flowed into the inside of the flow channel formation member  801 , in the second liquid storage part  785 B can be suppressed. That is, the flow of the air bubble, which is flowed into the inside of the flow channel formation member  801 , into the inside of the second liquid storage part  785 B is prevented by the airtightness of the third part  801 C. As a result, in the fourteenth embodiment, it is hard to further stop the ink supply to the print head  540  (the ink supply to the print head  540  is easily maintained). In the fourteenth embodiment, the relationship of the aforementioned formula (11) is also applied. 
     Example N1 
     As a method for making the density of the third part  801 C higher than the density of the fourth part  801 D, for example, the method in which the flow channel formation member  801  is fitted into the recessed part  270  in a compressed state may be employed. That is, this method is the method for pressing the flow channel formation member  801  into the recessed part  270 . Hereinafter, the example in which the flow channel formation member  801  is fitted into the recessed part  270  in a compressed state is referred to as Example N1. According to Example N1, the flow channel formation member  801  can be compressed by the upper surface  270 A and the container-side-filter  273 , and the density of the third part  801 C can be enhanced. Therefore, the density of the third part  801 C can be made higher than the density of the fourth part  801 D. 
     Example N2 
     As a method for making the density of the third part  801 C higher than the density of the fourth part  801 D, for example, the method for providing the flow channel formation member  801  made of materials having different densities in the third part and the fourth part may be employed. This method is the method for providing the flow channel formation member  801  by two different materials which have different densities. Hereinafter, the example in which the flow channel formation member  801  is provided by the materials having different densities from each other is referred to as Example N2. In Example N2, the fourth part  801 D is made of the material having low density, and the third part  801 C is made of the material having high density. According to Example N2, the density of the third part  801 C can be made higher than the density of the fourth part  801 D. In Example N2, any of the method in which the third part  801 C and the fourth part  801 D are formed in separate bodies to each other and the method in which the third part  801 C and the fourth part  801 D are integrally formed may be employed. 
     P. Fifteenth Embodiment 
     A cartridge  20 P according to the fifteenth embodiment has the same structure as the cartridge  20 F according to the sixth embodiment except the densities of the flow channel formation member  801  are different depending on a part of the flow channel formation member  801 . Therefore, hereinafter, for the same structure as the sixth embodiment, the same symbols as the sixth embodiment are allotted, and the detailed descriptions are omitted. 
     In the cartridge  20 P, as shown in  FIG. 41 , the flow channel formation member  801  may be divided into the fifth part  801 E and the sixth part  801 F. The fifth part  801 E is the part along the side surface  270 B of the recessed part  270  in the flow channel formation member  801 , and when the flow channel formation member  801  is planarly viewed in the XY plane surface, the fifth part  801 E is the part configuring the outer periphery of the flow channel formation member  801 . The sixth part  801 F is the part in the region surrounded by the fifth part  801 E in the flow channel formation member  801 . The side surface  270 B is the side surface inside the recessed part  270 . The side surface  270 B is the surface intersecting the upper surface  270 A. 
     In the cartridge  20 P, the density of the fifth part  801 E is higher than the density of the sixth part  801 F. The airtightness of the fifth part  801 E is higher than the airtightness of the sixth part  801 F. Therefore, the bubble growth can be suppressed in the gap between the fifth part  801 E and the container-side-filter  273 . The ink may be existed in the gap between the fifth part  801 E and the container-side-filter  273 . The bubble growth may occur in the ink existed in the gap between the fifth part  801 E and the container-side-filter  273 . 
     However, the airtightness of the fifth embodiment  801 E is enhanced in the cartridge  20 P, so that the growth of the air bubble generated in the gap between the fifth part  801 E and the container-side-filter  273  and exceeding a certain volume can be suppressed. The flow of the air bubble, which is generated in the gap between the fifth part  801 E and the container-side-filter  273 , into the inside of the flow channel formation member  801  is blocked by the airtightness of the fifth part  801 E. As a result, in the fifteenth embodiment, it is hard to stop the ink supply to the print head  540  (the ink supply to the print head  540  is easily maintained). The relationship of the aforementioned formula (11) is also applied to the fifteenth embodiment. 
     Example P1 
     As a method for making the density of the fifth part  801 E higher than the density of the sixth part  801 F, for example, a method for fitting the flow channel formation member  801  into the recessed part  270  in a compressed state may be employed. That is, this method is the method to press the flow channel formation member  801  into the recessed part  270 . Hereinafter, an example in which the flow channel formation member  801  is fitted into the recessed part  270  in a compressed state is referred to as Example P1. According to Example P1, the density of the peripheral side of the flow channel formation member  801  can be enhanced when the flow channel formation member  801  is planarly viewed in the XY plane surface. With this, the density of the fifth part  801 E can be made higher than the density of the sixth part  801 F. 
     Example P2 
     As a method for making the density of the fifth part  801 E higher than the density of the sixth part  801 F, for example, a method for providing the flow channel formation member  801  with materials having different densities to each other may be employed. This method is the method for providing the flow channel formation member  801  with two types of materials having different densities. Hereinafter, an example in which the flow channel formation member  801  is provided in the materials having different densities to each other is referred to as Example P2. In Example P2, the sixth part  801 F is configured by the material having low density, and the fifth part  801 E is configured by the material having high density. According to Example P2, the density of the peripheral side of the flow channel formation member  801  can be enhanced when the flow channel formation member  801  is planarly viewed in the XY plane surface. With this, the density of the fifth part  801 E can be higher than the density of the sixth part  801 F. In Example P2, any of the method in which the fifth part  801 E and the sixth part  801 F are formed in separate bodies to each other and the method in which the fifth part  801 E and the sixth part  801 F are integrally formed may be employed. 
     For the fourteenth embodiment and the fifteenth embodiment, the fourteenth embodiment and the fifteenth embodiment can be individually employed or the fourteenth embodiment and the fifteenth embodiment can be employed in combination. 
     Q. Modified Example 
     As described above, some embodiments of the present invention were described, but it is not limited to these embodiments, and various structures can be adopted unless it deviates from the spirits of the invention. For example, the following modifications can be made. 
     Modified Example 1 
     The support member  275  and the foam  272  according to the aforementioned 1 st  to 4 th  embodiments may be integrally formed by using, for example, a hard porous member. Further, the container-side-filter  273  and the foam  272  may be integrally formed. 
     Modified Example 2 
     The porous structure may not be provided in the container-side-filter  273  and the inclined part  273   c  according to the 1 5t  to 15 th  embodiments. That is, the porous structure may be provided in only the part contacting the device-side-filter  642 , and the porous structure may not be provided in other parts. 
     Modified Example 3 
     In the first embodiment to the fifteenth embodiment, the container-side-filter  273  has a structure projecting in a direction of the device-side-filter  642 . On the other hand, for example, the container-side-filter  273  may be a structure recessed to the inside. That is, the container-side-filter  273  may be projected toward the opposite side of the device-side-filter  642 . However, in this case, the generation of the air bubble is suppressed at the time of the attachment and detachment of the cartridges  20 , so that the device-side-filter  642  is preferably projected in a direction of the container-side-filter  273 . Further, in the structure in which the container-side-filter  273  is projected in a direction of the device-side-filter  642 , the device-side-filter  642  may be projected in a direction of the container-side-filter  273  or may be projected in a direction of the opposite side of the container-side-filter  273 . 
     Modified Example 4 
     Modified Example 4 shows that the meniscus pressure of the container-side-filter  273  and the meniscus pressure of the nozzles  541  are equal, or the meniscus pressure of the nozzles  541  is smaller than the meniscus pressure of the container-side-filter  273 . The 2 nd  to 15 th  embodiments show the container-side-filter  273  having a condition in which the meniscus pressure of the nozzles  541  is greater than the meniscus pressure of the container-side-filter  273 , but it is not limited to this. It may be substituted to Modified Example 4. With the substitution of the aforementioned 2 nd  to 15 th  embodiments, the filter satisfying the conditions described blow may be employed as the container-side-filter  273 . 
     In Modified Example 4, the state in which the cartridges  20  are mounted on the holder  60  is defined as “at the time of mounted state”. Further, a border between the container-side-filter  273  and the device-side-filter  642  is existed in the middle of the ink flow channel from the cartridges  20  to the print head  540 . In this border, a contacting part where the container-side-filter  273  and the device-side-filter  642  are physically contacted and an ink layer surrounding the peripheral of the contacting part are existed. The contacting part and the ink layer are defined as “contact region”. Further, a case in which the ink amount per unit time suctioned from the cartridge  20  to the print head  540  is the maximum is defined as “at the time of maximum flow rate”. 
     In Modified Example 4, the following symbols are defined. 
     PBf(4): Meniscus pressure of the container-side-filter  273 . 
     PBn(4): Meniscus pressure of the nozzle  541 . 
     Ps(4): Meniscus pressure of the meniscus formed on the interfacial surface between the ink and the atmosphere when the ink is existed in the contact region at the time of mounted state. 
     P1(4): Absolute value of the maximum pressure generated in a direction from the device-side-filter  642  to the nozzles  541  in the contact region at the time of maximum flow rate. 
     P2(4): Absolute value of the maximum pressure (value subtracting the absolute value of the pressure loss of the cartridges  20  at the time of maximum flow rate from the absolute value of the maximum negative pressure in the liquid storage part  200 ) generated from the container-side-filter  273  to the liquid storage part  200 , and generated in the contact region at the time of maximum flow rate. 
     P 3 ( 4 ): Negative pressure generated in the contact region at the time of maximum flow rate. 
     The meniscus pressure PBf of the container-side-filter  273  can be shown as the following formulas (13) to (16).
 
 P 3(4)= P 1(4)+ P 2(4)  (13)
 
 Ps (4)&gt; P 3(4)  (14)
 
     In a case in which the formulas (13) and (14) are satisfied, when the ink is supplied from the cartridges  20  to the print head  540 , the meniscus pressure Ps(4) generated on the interfacial surface between the ink and the atomosphere in the contact region becomes more than the negative pressure P3(4) generated between the container-side-filter  273  and the device-side-filter  642 . With this, at the time of maximum flow rate, the meniscus generated in the interfacial surface between the ink and the atomosphere in the contact region is not broken. That is, the air is not entered to the contact region. As a result, the mixture of the air into the ink flow channel in a direction from the cartridges  20  to the print head  540  can be suppressed.
 
 PBf (4)&gt; P 2(4)&gt; P 1(4)  (15)
 
     In a case in which the formula (15) is satisfied, at the time of maximum flow rate, the meniscus of the container-side-filter  273  is not broken. Therefore, at the time of maximum flow rate, the entering of the air into the inside of the liquid supply part  280  from the outside of the cartridges  20  via the container-side-filter  273  can be prevented. As a result, the mixture of the air into the ink flow channel in a direction from the cartridges  20  to the print head  540  can be suppressed.
 
 Ps (4)&gt; PBf (4)  (16)
 
     In a case in which the formula (16) is satisfied, at the time of mounted state, the ink inside the liquid storage part  200  passes through the container-side-filter  273  and the ink can be transferred to the contact region by contacting the container-side-filter  273  with the device-side-filter  642 . By trasferring the ink to the contact region, the meniscus is formed on the interfacial surface between the ink and the atomosphere in the contact region. Therefore, the mixture of the air into the ink flow channel in a direction from the cartridges  20  to the print head  540  can be suppressed.