Patent Publication Number: US-9834000-B2

Title: Liquid storage container and liquid jet apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This is a continuation application of U.S. patent application Ser. No. 14/519,588 filed on Oct. 21, 2014. This application claims priority to Japanese Patent Application No. 2013-219889 filed on Oct. 23, 2013. The entire disclosures of U.S. patent application Ser. No. 14/519,588 and Japanese Patent Application No. 2013-219889 are hereby incorporated herein by reference. 
    
    
     BACKGROUND 
     Technical Field 
     The present invention relates to a liquid storage container and a liquid jet apparatus, inter alia. 
     Related Art 
     Inkjet printers have conventionally been known as one example of a liquid jet apparatus. In an inkjet printer, printing on a printing medium such as printing paper can be carried out by discharging an ink, which is one example of a liquid, from an ejection head onto the printing medium. With such an inkjet printer, there is a conventionally known configuration where ink that has been collected in a tank, which is one example of a liquid storage container, is supplied to the ejection head. An ink injection port is provided to this tank. A user is able to refill the tank with ink from the ink injection port. In such a tank, there is a conventionally known configuration with which a liquid storage chamber in which the ink is stored and an air storage chamber in which air is introduced are in communication with one another by a communicating section (see JP-A-2012-20495 (patent document 1), for example). 
     SUMMARY 
     In the tank described in patent document 1 above, even when, for example, the ink that is inside the liquid storage chamber flows out to the air storage chamber side via the communicating section, the ink that has flowed out to the air storage chamber side can still be collected in the air storage chamber. This tank therefore makes it easier to reduce leakage of the ink that is inside the liquid storage chamber to outside of the tank via the air release port. However, with the tank described above, in an injection posture at which the ink is injected into the liquid injection port, the liquid storage chamber-side opening of the communicating section is located below the liquid injection port and therefore the ink inside the liquid storage section readily flows into the communicating section. Then, when an external force such as vibration acts in a state where the ink has flowed into the communicating section, the ink inside the communicating section becomes more likely to flow into the air storage chamber. When the ink is more likely to flow into the air storage chamber, then there is an increased possibility that ink could leak out of the tank from the air release port. In this manner, a conventional liquid storage container has a problem in that it is difficult to reduce the possibility of leakage of the liquid from occurring. 
     The present invention has been made in order to solve the above-described problem at least in part, and can be realized in the form of the following modes or application examples. 
     A liquid storage container is characterized by comprising a liquid storage section configured to store a liquid, a liquid injection section configured to inject the liquid into the liquid storage section, an air chamber communicated with air, an air introduction section communicated to the air chamber and configured to introduce the air to the air chamber, a communicating passage through which the liquid storage section and the air chamber are communicated to each other, a liquid injection port defined as an intersection at which the liquid injection section and the liquid storage section intersect each other, and a connecting port defined between the liquid storage section and the communicating passage and located above the liquid injection port in a posture where the liquid injection port is oriented upward in a direction intersecting with a horizontal direction. 
     In the liquid storage container of this aspect, the connecting port between the liquid storage section and the communicating passage is located above the liquid injection port, and therefore the liquid inside the liquid storage section is less likely to reach the connecting port. For this reason, the possibility that the liquid inside the liquid storage section could flow into the communicating passage is reduced. As a result, the possibility that the liquid inside the liquid storage section could reach the air chamber is reduced, and therefore the possibility that the liquid inside the liquid storage section could leak out of the liquid storage container via the air introduction section from the air chamber can be reduced. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Referring now to the attached drawings which form a part of this original disclosure: 
         FIG. 1  is a perspective view illustrating a printer in the present embodiments; 
         FIG. 2  is a perspective view illustrating a printer in the present embodiments; 
         FIG. 3  is a perspective view illustrating a mechanism unit of a printer in the present embodiments; 
         FIG. 4  is an exploded perspective view illustrating a tank in a first embodiment; 
         FIG. 5  is a side view of when a tank in the first embodiment is viewed from a sheet member side; 
         FIG. 6  is a perspective view illustrating a case in the first embodiment; 
         FIG. 7  is a cross-sectional view of when an ink injection section, a supply port, and an air communication port in the present embodiments are cut in the XZ plane; 
         FIG. 8  is a side view of when a tank in the first embodiment is viewed from a sheet member side; 
         FIG. 9  is a side view of when a tank in the first embodiment is viewed from a sheet member side; 
         FIGS. 10A and 10B  are cross-sectional views of when a first buffer chamber in the first embodiment is cut in the YZ plane; 
         FIGS. 11A and 11B  are cross-sectional views illustrating another example of a first buffer chamber in the first embodiment; 
         FIG. 12  is an exploded perspective view illustrating a tank in a second embodiment; 
         FIG. 13  is a side view of when a tank in the second embodiment is viewed from a sheet member side; 
         FIG. 14  is a perspective view illustrating a case in the second embodiment; 
         FIG. 15  is a side view of when a tank in the second embodiment is viewed from a sheet member side; 
         FIG. 16  is an enlarged view of the A section in  FIG. 15 ; 
         FIG. 17  is a side view of when a tank in the second embodiment is viewed from a sheet member side; 
         FIG. 18  a side view of when a tank in the second embodiment is viewed from a sheet member side; 
         FIG. 19  is a perspective view illustrating a multifunction peripheral in the present embodiments; 
         FIG. 20  is a perspective view illustrating a multifunction peripheral in the present embodiments; 
         FIG. 21  is a perspective view illustrating a printer in the present embodiments; and 
         FIG. 22  is a perspective view illustrating a mechanism unit of a printer in the present embodiments. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     Embodiments shall be described below with reference to the accompanying drawings, using the example of an inkjet printer (hereinafter called a printer), which is one example of a liquid jet apparatus. In each of the drawings, there may be instances where the scales of the configurations and members have been altered in order to make the respective configurations large enough to be recognizable. 
     A printer  1  in the present embodiments, as illustrated in  FIG. 1 , has a first case  3  and a tank unit  5 . The printer  1  is able to print onto a printing medium P of printing paper or the like using ink, which is one example of a liquid. The tank unit  5  has a second case  7 , which is one example of a case member, and a plurality of (two or more) tanks  9 . The first case  3  and the second case  7  constitute an outer shell of the printer  1 . Here, in  FIG. 1 , XYZ axes have been assigned, which are coordinate axes that are orthogonal to one another. XYZ axes have been assigned where necessary in the subsequently illustrated drawings, as well. In each of the XYZ axes, the orientation of the arrow illustrates the plus direction (forward direction), and the opposite orientation to the orientation of the arrow illustrates the minus direction (negative direction). In a state in which the printer  1  is used, the printer  1  is arranged on a horizontal plane that is defined by the X-axis direction and the Y-axis direction. In the state of use of the printer  1 , the Z-axis direction is a direction orthogonal to the horizontal plane, and the −Z-axis direction is vertically downward. 
     Stored in the first case  3  is a mechanism unit  10  ( FIG. 3 ) of the printer  1 . The mechanism unit  10  is a mechanism portion for executing the operation of printing in the printer  1 . A more detailed description of the mechanism unit  10  shall be provided below. The plurality of tanks  9  are stored inside the second case  7 , as illustrated in  FIG. 1 , and each of the plurality of tanks  9  stores ink that is supplied for printing. In the present embodiments, there are four of the tanks  9  that are provided. In the four tanks  9 , there is a different kind of ink for each of the tanks  9 . In the present embodiments, the four kinds of ink that are employed are black, yellow, magenta, and cyan. One of each is provided—a tank  9  that stores the black ink, a tank  9  that stores the yellow ink, a tank  9  that stores the magenta ink, and a tank  9  that stores the cyan ink. In the printer  1 , the plurality of tanks  9  are provided to the outside of the first case  3 . For this reason, in the printer  1 , the plurality of tanks  9  are not built into the first case  3 , which covers the mechanism unit  10 . 
     Also provided to the printer  1  is a paper discharge section  11 . In the printer  1 , the printing medium P is discharged from the paper discharge section  11 . In the printer  1 , a surface to which the paper discharge section  11  is provided is understood to be a front surface  13 . The printer  1  also has an operation panel  17  at an upper surface  15  that intersects the front surface  13 . Provided to the operation panel  17  are a power button  18 A, another operation button  18 B, and the like. The tank unit  5  is provided to a side section  19  that intersects the front surface  13  and the upper surface  15  in the first case  3 . Window sections  21  are provided to the second case  7 . The window sections  21  are provided to a side section  27  that intersects with a front surface  23  and an upper surface  25  in the second case  7 . The window sections  21  are optically transparent. The four tanks  9  described above are provided to positions overlapping with the window sections  21 . For this reason, a worker who is using the printer  1  is able to view the four tanks  9  through the window sections  21 . 
     In the present embodiments, the sites of each of the tanks  9  that face the window sections  21  are optically transparent. The inks inside the tanks  9  can be viewed from the optically transparent sites of each of the tanks  9 . As such, viewing the four tanks  9  via the window sections  21  allows the worker to view the amount of ink that is in each of the tanks  9 . Provided to each of the tanks  9 , to the sites that face the window sections  21 , are an upper limit mark  28  indicative of an upper limit for the amount of ink and a lower limit mark  29  indicative of a lower limit for the amount of ink. The worker can use the upper limit marks  28  and the lower limit marks  29  as benchmarks to ascertain the amount of ink that is in each of the tanks  9 . Meanwhile, the first case  3  and the second case  7  are constituted of separate bodies from one another. For this reason, in the present embodiments, the second case  7  can be separated from the first case  3 , as illustrated in  FIG. 2 . The second case  7  is coupled to the first case  3  by mounting screws  31 . Also, as illustrated in  FIG. 2 , the second case  7  at least partially covers the four (two or more) tanks  9 , such as with, for example, the front surfaces, upper surfaces, and side surfaces thereof. 
     The printer  1  has a print section  41  and supply tubes  43 , as illustrated in  FIG. 3 , which is a perspective view illustrating the mechanism unit  10 . The print section  41  has a carriage  45 , a print head  47 , and four relay units  49 . The print head  47  is mounted onto the carriage  45 , as are the relay units  49 . The supply tubes  43  are flexible and are provided between the tanks  9  and the relay units  49 . The inks inside the tanks  9  are sent to the relay units  49  via the supply tubes  43 . The relay units  49  relay to the print head  47  the inks that are supplied from the tanks  9  via the supply tubes  43 . The print head  47  discharges the supplied inks as ink droplets. 
     The printer  1  also has a medium conveyance mechanism (not shown) and a head conveyance mechanism (not shown). The medium conveyance mechanism conveys the printing medium P along the Y-axis direction by driving a conveyance roller  51  using power coming from a motor (not shown). The head conveyance mechanism conveys the carriage  45  along the X-axis direction by transmitting power coming from a motor  53  to the carriage  45  via a timing belt  55 . The print head  47  is mounted onto the carriage  45 . For this reason, the print head  47  can be conveyed in the X-axis direction via the carriage  45 , by the head conveyance mechanism. The print head  47  is supported by the carriage  45  in a state of facing the printing medium P. The inks are discharged from the print head  47  while the relative position of the print head  47  with respect to the printing medium P is being changed by the medium conveyance mechanism and the head conveyance mechanism, whereby printing is performed on the printing medium P. 
     Various embodiments of the tanks  9  shall be described. For the purpose of discriminating between the different embodiments of the tanks  9  below, a different alphabetic character for each of the embodiments shall be appended to the reference numeral for the tanks  9 . 
     (First Embodiment) 
     A tank  9 A as in the first embodiment shall now be described. The tank  9 A, as illustrated in  FIG. 4 , has a case  61 , which is one example of a tank main body, and a sheet member  63 . The case  61  is constituted of, for example, a synthetic resin such as nylon or polypropylene. The sheet member  63  is formed of a synthetic resin (for example, nylon, polypropylene, or the like) in the shape of a film and is flexible. In the present embodiment, the sheet member  63  is optically transparent. The tank  9 A has a configuration with which the case  61  and the sheet member  63  are bonded together. Bonding sections  64  are provided to the case  61 .  FIG. 4  depicts the bonding sections  64  with hatching in order to better illustrate the configuration. The sheet member  63  is bonded to the bonding sections  64  of the case  61 . In the present embodiment, the case  61  and the sheet member  63  are bonded together by welding. 
     The tank  9 A, as illustrated in  FIG. 5 , has a storage section  65  and a communicating section  67 . The communicating section  67  has a first air chamber  68 , a second air chamber  69 , a first communicating passage  71 , a third air chamber  72 , a second communicating passage  73 , a first buffer chamber  74 , and a second buffer chamber  75 . In the tank  9 A, the ink is stored inside the storage section  65 .  FIG. 5  illustrates a state where the tank  9 A is viewed from the sheet member  63  side, and depicts the case  61  with the sheet member  63  in between. The storage section  65 , the first air chamber  68 , the second air chamber  69 , the first communicating passage  71 , the third air chamber  72 , and the second communicating passage  73  are partitioned from one another by the bonding sections  64 . The first buffer chamber  74  and the second buffer chamber  75  are each provided to inside the second communicating passage  73 . 
     The case  61  has a first wall  81 , a second wall  82 , a third wall  83 , a fourth wall  84 , a fifth wall  85 , a sixth wall  86 , a seventh wall  87 , and an eighth wall  88 . Arranged on the side of the fifth wall  85  opposite to the storage section  65  side are the first air chamber  68 , the second air chamber  69 , the first communicating passage  71 , and the third air chamber  72 . When the first wall  81  is seen in plan view from the sheet member  63  side, then the storage section  65  is surrounded by the second wall  82 , the third wall  83 , the fourth wall  84 , and the fifth wall  85 . 
     When the first wall  81  is seen in plan view from the sheet member  63  side, then the first air chamber  68 , the second air chamber  69 , the first communicating passage  71 , and the third air chamber  72  are surrounded by the fifth wall  85 , the sixth wall  86 , the seventh wall  87 , and the eighth wall  88 . The first wall  81  of the storage section  65  and the first wall  81  of the first air chamber  68 , the second air chamber  69 , and the third air chamber  72  are the same wall as one another. In other words, in the present embodiment, the first wall  81  is shared among the storage section  65 , the first air chamber  68 , the second air chamber  69 , and the third air chamber  72 . 
     The second wall  82 , the third wall  83 , the fourth wall  84 , and the fifth wall  85  each intersect the first wall  81 , as illustrated in  FIG. 6 . The second wall  82  and the third wall  83  are provided to positions that face each other across the first wall  81  in the X-axis direction. The fourth wall  84  and the fifth wall  85  are provided to positions that face each other across the first wall  81  in the Z-axis direction. The second wall  82  intersects with each of the fourth wall  84  and the fifth wall  85 . The third wall  83  also intersects with each of the fourth wall  84  and the fifth wall  85 . 
     The second wall  82 , the third wall  83 , the fourth wall  84 , and the fifth wall  85  project out in the +Y-axis direction from the first wall  81 . Due to this, where the first wall  81  is a main wall, a recess  91  is constituted of the second wall  82 , the third wall  83 , the fourth wall  84 , and the fifth wall  85 , which extend in the +Y-axis direction from the main wall. The recess  91  is configured with an orientation so as to be concave going towards the −Y-axis direction. The recess  91  forms an opening going toward the +Y-axis direction, i.e., toward the sheet member  63  ( FIG. 4 ) side. In other words, the recess  91  is provided at an orientation so as to be concave going toward the −Y-axis direction, i.e., toward the side opposite to the sheet member  63  ( FIG. 4 ) side. When the sheet member  63  is bonded to the case  61 , the recess  91  is closed off by the sheet member  63 , thus constituting the storage section  65 . The first wall  81  through the eighth wall  88  each are not limited to being flat walls, and may also be ones that comprise irregularities. 
     The sixth wall  86  projects out from the fifth wall  85  toward the side of the fifth wall  85  opposite to the fourth wall  84  side, i.e., toward the +Z-axis direction side of the fifth wall  85 , as illustrated in  FIG. 5 . The seventh wall  87  projects out from the fifth wall  85  toward the side of the fifth wall  85  opposite to the fourth wall  84  side, i.e., toward the +Z-axis direction side of the fifth wall  85 . The sixth wall  86  and the seventh wall  87  are provided to positions that face each other across the first air chamber  68 , the second air chamber  69 , the first communicating passage  71 , and the third air chamber  72  in the X-axis direction. The eighth wall  88  is provided to a position that faces the fifth wall  85  across the first air chamber  68 , the second air chamber  69 , the first communicating passage  71 , and the third air chamber  72  in the Z-axis direction. The sixth wall  86  intersects with each of the fifth wall  85  and the eighth wall  88 . The seventh wall  87  also intersects with each of the fifth wall  85  and the eighth wall  88 . 
     Provided between the fifth wall  85  and the eighth wall  88  is a ninth wall  93  by which the first air chamber  68  and the second air chamber  69  are partitioned in the Z-axis direction. Also, provided between the sixth wall  86  and the seventh wall  87  are a tenth wall  94  and an eleventh wall  95 . Between the first air chamber  68  and second air chamber  69  and the third air chamber  72 , a separation in the X-axis direction is formed by the tenth wall  94  and the eleventh wall  95 . The tenth wall  94  is provided to the seventh wall  87  side more than the sixth wall  86 , and faces the sixth wall  86 . The eleventh wall  95  is provided to the sixth wall  86  side more than the seventh wall  87 , and faces the seventh wall  87 . The eleventh wall  95  is provided to the seventh wall  87  side more than the tenth wall  94 . 
     The sixth wall  86 , the seventh wall  87 , the eighth wall  88 , the ninth wall  93 , the tenth wall  94 , and the eleventh wall  95  each project out in the +Y-axis direction from the first wall  81 , as illustrated in  FIG. 6 . The sixth wall  86 , the ninth wall  93 , the tenth wall  94 , and the eighth wall  88 , which extend in the +Y-axis direction from the first wall  81 , together constitute a recess  97 . The sixth wall  86 , the fifth wall  85 , the tenth wall  94 , and the ninth wall  93 , which extend in the +Y-axis direction from the first wall  81 , together constitute a recess  98 . The fifth wall  85 , the seventh wall  87 , the eighth wall  88 , and the eleventh wall  95 , which extend in the +Y-axis direction from the first wall  81 , together constitute a recess  99 . 
     The recess  97 , the recess  98 , and the recess  99  each form an opening going toward the +Y-axis direction, i.e., toward the sheet member  63  ( FIG. 4 ) side. In other words, the recess  97 , the recess  98 , and the recess  99  are provided at an orientation so as to be concave going toward the −Y-axis direction, i.e., toward the side opposite to the sheet member  63  ( FIG. 4 ) side. Then, when the sheet member  63  is bonded to the case  61 , the recess  97  is closed off by the sheet member  63 , thus constituting the first air chamber  68 . Likewise, when the sheet member  63  is bonded to the case  61 , the recess  98  is closed off by the sheet member  63 , thus constituting the second air chamber  69 , and the recess  99  is closed off by the sheet member  63 , thus constituting the third air chamber  72 . The amounts by which the second wall  82  through eighth wall  88  and the ninth wall  93  through eleventh wall  95  project out from the first wall  81  are set so as to be the same amount of projection to one another. 
     The second wall  82  and the sixth wall  86  have a stepped difference in the X-axis direction. The second wall  82  is located to the third wall  83  side more than the sixth wall  86 , i.e., to the −X-axis direction side more than the sixth wall  86 . The third wall  83  and the seventh wall  87  have a stepped difference in the X-axis direction. The seventh wall  87  is located to the second wall  82  side more than the third wall  83 , i.e., to the +X-axis direction side more than the third wall  83 . An ink injection section  101  is provided between the third wall  83  and the seventh wall  87  in the state where the first wall  81  is seen in plan view from the sheet member  63  side. The ink injection section  101  is provided to the fifth wall  85 . 
     The first communicating passage  71  is provided between the tenth wall  94  and the eleventh wall  95 , as illustrated in  FIG. 5 , and forms communication between the second air chamber  69  and the third air chamber  72 . The second communicating passage  73  is provided to the outside of the storage section  65 , the first air chamber  68 , the second air chamber  69 , the first communicating passage  71 , and the third air chamber  72 . The second communicating passage  73  forms communication between the third air chamber  72  and the storage section  65 . A communication port  102  is provided to the ninth wall  93 . The first air chamber  68  and the second air chamber  69  are in communication with one another via the communication port  102 . The second air chamber  69  is communicated to the first communicating passage  71  via a communication port  103 . Also, the third air chamber  72  is communicated to the first communicating passage  71  via a communication port  104 . The first communicating passage  71  is meandering. The second air chamber  69  is communicated to the third air chamber  72  after meandering the first communicating passage  71 . 
     As illustrated in  FIG. 6 , an extended section  105  is provided to the case  61 . The second communicating passage  73  is provided to the extended section  105 . The extended section  105  has a site  105 A that is extended out toward the +X-axis direction side from the fifth wall  85  along the edge of the opening of the recess  91 , in a region of the fifth wall  85  that is to the −X-axis direction side more than the seventh wall  87 . The site  105 A is also extended out toward the −X-axis direction side from the seventh wall  87  along the edge of the opening of the recess  99  in the seventh wall  87 . The extended section  105  furthermore has a site  105 B that is extended out toward the +Z-axis direction side from the eighth wall  88 . The extended section  105  moreover has a site  105 C that is extended out toward the +X-axis direction side from the sixth wall  86  along the edge of the openings of the recess  97  and the recess  98  in the sixth wall  86 . The extended section  105  additionally has a site  105 D that is extended out toward the +X-axis direction side from the second wall  82  along the edge of the opening of the recess  91  in the second wall  82 . The second communicating passage  73  is configured as a groove  117  that is provided to the extended section  105  at an orientation so as to be concave going toward the side opposite to the sheet member  63  side. 
     Here, inside the recess  91 , a recess  109  is provided. The recess  109  is provided at an orientation so as to be concave going toward the opposite side to the fifth wall  85  side more than the fourth wall  84 , i.e., going toward the −Z-axis direction side more than the fourth wall  84 . Then, in the recess  109 , a supply port  113  is provided to a wall  111  that faces the third wall  83  and the second wall  82 . For this reason, the supply port  113  is provided between the third wall  83  and the second wall  82  in a state where the first wall  81  is seen in plan view. The ink injection section  101  and the supply port  113  each form communication between the outside of the case  61  and the inside of the recess  91 . The supply port  113  projects out toward the second wall  82  side along the X-axis direction from the wall  111 . 
     Also, an air communication port  115  is provided to the eighth wall  88 . The air communication port  115  projects out from the eighth wall  88  to the side of the eighth wall  88  opposite to the fifth wall  85 , i.e., to the +Z-axis direction side of the eighth wall  88 . The air communication port  115  is provided to a position that overlaps with the recess  97  when the eighth wall  88  is seen in plan view, i.e., when the eighth wall  88  is seen in plan view in the XY plane. The air communication port  115  forms communication between the outside of the case  61  and the inside of the recess  97 . The air communication port  115  is a communicating passage for air, in order to introduce the air that is outside of the case  61  to the inside of the recess  97 . In the case  61 , the bonding sections  64  are provided along the respective contours of each of the recess  91 , the recess  97 , the recess  98 , the recess  99 , the recess  109 , the first communicating passage  71 , and the second communicating passage  73 . 
     The sheet member  63  faces the first wall  81  across the second wall  82  through eighth wall  88  in the Y-axis direction, as illustrated in  FIG. 4 . The sheet member  63  has a size that covers the recess  91 , the recess  97 , the recess  98 , the recess  99 , the recess  109 , and the extended section  105 , as seen in plan view. The sheet member  63  is welded to the bonding sections  64  in a state where there is a gap with the first wall  81  on the other side. This causes the recess  91 , the recess  97 , the recess  98 , the recess  99 , the recess  109 , the first communicating passage  71 , and the second communicating passage  73  to be sealed off by the sheet member  63 . For this reason, the sheet member  63  can be regarded also as a covering for the case  61 . 
     The second communicating passage  73  has a communication port  106  and a communication port  107 , as illustrated in  FIG. 5 . The communication port  106  is an opening that opens toward the inside of the third air chamber  72 . The communication port  107  is an opening that opens toward the inside of the storage section  65 . The third air chamber  72  passes from the communication port  106  via the second communicating passage  73  through the communication port  107  to the storage section  65 . By the above, the storage section  65  passes via the second communicating passage  73 , the third air chamber  72 , the first communicating passage  71 , the second air chamber  69 , the first air chamber  68 , and the air communication port  115  to the exterior of the tank  9 A. This means that the communicating section  67  establishes communication between the air communication port  115  and the storage section  65 . Air that has flowed in to inside the first air chamber  68  from the air communication port  115  flows in to the second air chamber  69  via the communication port  102 . Air that has flowed in to the second air chamber  69  flows in to the third air chamber  72  via the first communicating passage  71 . Then, the air that has flowed in to the third air chamber  72  flows in to the inside of the storage section  65  via the second communicating passage  73 . 
     The ink injection section  101  is provided to the fifth wall  85 . The ink injection section  101  is provided to inside a recess  121  that is surrounded by the seventh wall  87 , the extended section  105 , the third wall  83 , and the first wall  81 , as illustrated in  FIG. 6 . As stated earlier, the extended section  105  projects out to the eighth wall  88  side more than the fifth wall  85 . The seventh wall  87  also projects out to the eighth wall  88  side more than the fifth wall  85 . Likewise, in the present embodiment, the first wall  81  and the third wall  83  each project out to the eighth wall  88  side more than the fifth wall  85 . Then, the extended section  105  intersects with both the seventh wall  87  and the third wall  83 . The first wall  81  also intersects with both the third wall  83  and the seventh wall  87 . For this reason, a region of the fifth wall  85  that is on the third wall  83  side more than the seventh wall  87  constitutes the recess  121 , which is surrounded by the seventh wall  87 , the extended section  105 , the third wall  83 , and the first wall  81 . The recess  121  is provided at an orientation so as to be concave going toward the fourth wall  84  side from the fifth wall  85  side. 
     Due to the configuration described above, the ink injection section  101  is surrounded by the seventh wall  87 , the extended section  105 , the third wall  83 , and the first wall  81 . In other words, the ink injection section  101  is provided to a region of the fifth wall  85  that is surrounded by the seventh wall  87 , the extended section  105 , the third wall  83 , and the first wall  81 . Then, the recess  121  has the function of an ink receiving section. The ink receiving section can receive, for example, ink that overflows from the ink injection section  101 , or ink that has dripped down during injection. In this manner, the recess  121  has a function as an ink receiving section for receiving the ink. 
     In the case  61 , a recess  123  is provided to the side of the sixth wall  86  opposite to the recess  97  side. The recess  123  and the recess  97  are lined up sandwiching the sixth wall  86  in the X-axis direction. Also, in the case  61 , a recess  124  is provided to the side of the sixth wall  86  opposite to the recess  98  side. The recess  124  and the recess  98  are lined up sandwiching the sixth wall  86  in the X-axis direction. The recess  123  and the recess  124  are each provided at an orientation so as to be concave going toward the side opposite to the sheet member  63  ( FIG. 4 ) side. The recess  123  and the recess  124  are both provided to inside the groove  117 , and are lined up sandwiching a twelfth wall  125  in the Z-axis direction. The recess  123  and the recess  124  can each also be regarded as being configurations with which the depth at a part of the groove  117  is increased. 
     When the sheet member  63  is bonded to the case  61 , the groove  117  is closed off by the sheet member  63 , thus constituting the second communicating passage  73 , as illustrated in  FIG. 5 . Then, in the second communicating passage  73 , the recess  123  is configured as the first buffer chamber  74  and the recess  124  is configured as the second buffer chamber  75 . Herein, as stated above, the recess  123  and the recess  124  can each also be regarded as being configurations with which the depth at a part of the groove  117  is increased. For this reason, the first buffer chamber  74  and the second buffer chamber  75  can also be regarded as being configurations with which the depth at a part of the second communicating passage  73  is increased. Accordingly, the respective cross-sectional areas of the first buffer chamber  74  and the second buffer chamber  75  in the horizontal plane (XY plane) are wider than the cross-sectional area of the second communicating passage  73  in the horizontal plane (XY plane). The respective cross-sectional areas of the first buffer chamber  74  and the second buffer chamber  75  in the horizontal plane (XY plane) are narrower than the cross-sectional area of the third air chamber  72  in the horizontal plane (XY plane). Thus, the respective volumes of the first buffer chamber  74  and the second buffer chamber  75  are smaller than the volume of the third air chamber  72 . 
     Provided to inside the storage section  65  are a plurality of support sections  127 , as illustrated in  FIG. 5 . In the present embodiment, there are two support sections  127  provided. Below, in cases where a distinction is being made between the two support sections  127 , then the two support sections  127  shall be denoted by a support section  127 A and a support section  127 B. The two support sections  127  are lined up in the X-axis direction. Of the two support sections  127 , the support section  127 A is located to the third wall  83  side more than the support section  127 B. The two support sections  127  are each spaced apart from each of the second wall  82 , the third wall  83 , the fourth wall  84 , and the fifth wall  85 . In the present embodiment, the gap between the third wall  83  and the support section  127 A, the gap between the support section  127 A and the support section  127 B, and the gap between the second wall  82  and the support section  127 B are set so as to be equal to one another. According to this configuration, deformations of the sheet member  63  can be equally regulated between the third wall  83  and the support section  127 A, between the support section  127 A and the support section  127 B, and between the second wall  82  and the support section  127 B. In a configuration where there is one support section  127  provided, then the gap between the third wall  83  and the support section  127  and the gap between the second wall  82  and the support section  127  are set so as to be equal to one another. This makes it possible to equally regulate deformations of the sheet member  63  between the third wall  83  and the support section  127  and between the second wall  82  and the support section  127 . 
     The two support sections  127  are provided to the first wall  81  as illustrated in  FIG. 6 , and project out from the first wall  81  toward the sheet member  63  ( FIG. 4 ) side, i.e., toward the +Y-axis direction side. Each of the two support sections  127  presents with a planar shape that extends along the YZ plane. The amount by which the two support sections  172  project out from the first wall  81  is set so as to be equal to the amounts by which the second wall  82  through fifth wall  85  project out from the first wall  81 . At each of the two support sections  127 , the bonding sections  64  are provided to an end section of the side opposite to the first wall  81  side, i.e., of the sheet member  63  ( FIG. 4 ) side. The sheet member  63  is also bonded to the bonding sections  64  at each of the two support sections  127 . 
     The ink injection section  101  has an opening  128  and a side wall  129 , as illustrated in  FIG. 7 , which is a cross-sectional view of when the ink injection section  101 , the supply port  113 , and the air communication port  115  are cut along the XZ plane. The opening  128  is a through hole that is provided to the fifth wall  85 . The opening  128  is also an intersection at which the ink injection section  101  and the storage section  65  intersect together. A configuration with which the side wall  129  projects out to the inside of the storage section  65  could also be employed as the configuration of the ink injection section  101 . In a configuration with which the side wall  129  projects out to the inside of the storage section  65 , as well, the intersection at which the ink injection section  101  and the storage section  65  intersect together would be defined as being the opening  128 . The recess  91  is communicated to the outside of the recess  91  via the opening  128 , which is a through hole. The side wall  129  is provided to the side of the fifth wall  85  opposite to the fourth wall  84  side and surrounds the periphery of the opening  128 , thus forming an ink injection path. The side wall  129  projects out from the fifth wall  85  toward the side opposite to the fourth wall  84  side. In the present embodiment, the side wall  129  projects out to the side opposite to the fourth wall  84  side more than each of the first wall  81  and the third wall  83 . The side wall  129  makes it possible to prevent ink that has collected in the recess  121  from flowing into the opening  128 . The first buffer chamber  74  ( FIG. 5 ), is located above the opening  128  in the Z-axis direction. 
     In the tank  9 A, an ink  141  is stored in the interior of the storage section  65 , as illustrated in  FIG. 8 , which is a side view of when the tank  9 A is viewed from the sheet member  63  side.  FIG. 8  omits any depiction of the sheet member  63  and depicts the bonding sections  64  with hatching in order to better illustrate the configuration. The ink  141  inside the storage section  65  is supplied to the print head  47  from the supply port  113 . In the present embodiment, in a state where the printer  1  is used for printing, then the supply tube  43  is connected to the supply port and a cap  143  is attached to the ink injection section  101 . Suction through the inside the supply tube  43  via the relay unit  49  causes the ink  141  inside the recess  91  to arrive at the print head  47  from the supply port  113 . 
     In association with the printing by the print head  47 , the ink  141  inside the storage section  65  is sent to the print head  47  side. For this reason, the pressure inside the storage section  65  becomes lower than the atmospheric pressure in association with the printing by the print head  47 . When the pressure inside the storage section  65  becomes lower than the atmospheric pressure, then the air inside the third air chamber  72  passes through the second communicating passage  73  and is sent to inside the storage section  65 . This makes it easier for the pressure inside the storage section  65  to be kept at atmospheric pressure. The air flows into the third air chamber  72  from the air communication port  115  after passing by way of the first air chamber  68 , the second air chamber  69 , and the first communicating passage  71 , in the stated order. By the above, the ink  141  inside the tank  9 A is supplied to the print head  47 . When the ink  141  inside the storage section  65  in the tank  9 A is consumed and little of the ink  141  remains, then the worker can refill the inside of the storage section  65  with new ink from the ink injection section  101 . 
     The second communicating passage  73 , as illustrated in  FIG. 9 , can be sectioned into a first passage  151 , a second passage  152 , a third passage  153 , a fourth passage  154 , a fifth passage  155 , and a sixth passage  156 . The first passage  151  originates at the communication port  106  and goes toward the third wall  83  along the fifth wall  85 , i.e., along the X-axis direction. The first passage  151  leads from the communication port  106  to a reversal section  161 . The reversal section  161  is a site where the orientation of the flow path in the second communicating passage  73  is reversed. At the reversal section  161 , the orientation of the flow path is reversed from the −X-axis direction to the +X-axis direction. In the route taken by the air from the air communication port  115  leading to the storage section  65 , the air communication port  115  side is the upstream side and the communication port  107  side is the downstream side. 
     The second passage  152  goes from the reversal section  161  toward the seventh wall  87  along the direction of extension of the first passage  151 , i.e., along the X-axis direction. The second passage  152  leads from the reversal section  161  to a bend section  162 . The bend section  162  is a site where the orientation of the flow path in the second communicating passage  73  is bent. At the bend section  162 , the orientation of the flow path is bent from the +X-axis direction to the +Z-axis direction. The third passage  153  goes from the bend section  162  toward the eighth wall  88  along the seventh wall  87 , i.e., along the Z-axis direction. The third passage  153  leads from the bend section  162  to a bend section  163 . The bend section  163  is a site where the orientation of the flow path in the second communicating passage  73  is bent. At the bend section  163 , the orientation of the flow path is bent from the +Z-axis direction to the +X-axis direction. 
     The fourth passage  154  goes from the bend section  163  toward the sixth wall  86  along the eighth wall  88 , i.e., along the X-axis direction. In the Z-axis direction, the fourth passage  154  is located above the third air chamber  72 . The fourth passage  154  leads from the bend section  163  to a bend section  164 . The bend section  164  is a site where the orientation of the flow path in the second communicating passage  73  is bent. At the bend section  164 , the orientation of the flow path is bent from the +X-axis direction to the −Z-axis direction. The fifth passage  155  leads from the bend section  164  toward the fourth wall  84  along the sixth wall  86 , i.e., along the Z-axis direction. The fifth passage  155  leads from the bend section  164  toward a reversal section  165 . 
     As stated above, in the Z-axis direction, the fourth passage  154  is located above the third air chamber  72 . In other words, a part of the second communicating passage  73  is located above the third air chamber  72 . According to this configuration, the ink that has flowed into the second communicating passage  73  from the storage section  65  will less readily rise above the third air chamber  72 , due to the action of gravity. For this reason, ink that has flowed into the second communicating passage  73  from the storage section  65  will less readily arrive at the third air chamber  72 . As a result, it is easier to prevent ink that has flowed from the storage section  65  into the second communicating passage  73  from leaking out from the tank  9 A. 
     Also, in the tank  9 A, the third passage  153  and the fifth passage  155  are located at mutually opposite sides across the third air chamber  72  in the X-axis direction. According to this configuration, the route of the second communicating passage  73  can be lengthened by putting the space surrounding the third air chamber  72  to use and forming the second communicating passage  73  so as to run around the third air chamber  72 . Lengthening the route of the second communicating passage  73  is preferable from the viewpoint of making it less likely that the liquid component of the ink inside the storage section  65  will evaporate and from the viewpoint of making it less likely that the ink that has flowed from the storage section  65  into the second communicating passage  73  will arrive at the third air chamber  72 . 
     The reversal section  165  is a site where the orientation of the flow path in the second communicating passage  73  is reversed. At the reversal section  165 , the orientation of the flow path is reversed from the −Z-axis direction to the +Z-axis direction. The sixth passage  156  goes from the reversal section  165  toward the fifth wall  85  along the second wall  82 , i.e., along the Z-axis direction. The sixth passage  156  leads from the reversal section  165  to the communication port  107  by way of a bend section  166 . The bend section  166  is a site where the orientation of the flow path in the second communicating passage  73  is bent. The second communicating passage  73  is communicated to inside the storage section  65  via the communication port  107  after the orientation of the flow path is bent in the bend section  166  from the +Z-axis direction to the −X-axis direction. 
     The first buffer chamber  74  and the second buffer chamber  75  are each provided to the fifth passage  155  in the second communicating passage  73 . The first buffer chamber  74  is arranged between ninth wall  93  and the eighth wall  88  in the Z-axis direction. The second buffer chamber  75  is arranged between the fifth wall  85  and the ninth wall  93  in the Z-axis direction. For this reason, in the vertical direction, the first buffer chamber  74  is located above the second buffer chamber  75 . 
     The places of arrangement of the first buffer chamber  74  and the second buffer chamber  75  are not limited to the fifth passage  155 . Any of the sites of the first passage  151  through sixth passage  156  could also be employed as the places of arrangement of the first buffer chamber  74  and the second buffer chamber  75 . Also, any of the sites of the reversal section  161 , the reversal section  165 , the bend section  162 , the bend section  163 , the bend section  164 , and the bend section  166  could also be employed as the places of arrangement of the first buffer chamber  74  and the second buffer chamber  75 . 
     The communication port  106  is located at the intersection at which the seventh wall  87  and the fifth wall  85  intersect together. In another viewpoint, the communication port  106  is located at the lower end of the third air chamber  72  in the vertical direction. The communication port  107  is located at the intersection at which the second wall  82  and the fifth wall  85  intersect together. In another viewpoint, the communication port  107  is located at the upper end of the storage section  65  in the vertical direction. In the present embodiment, the communication port  107  is located below the second buffer chamber  75  in the vertical direction. The communication port  103  is located at the intersection at which the fifth wall  85  and the tenth wall  94  intersect together. In another viewpoint, the communication port  103  is located at a lower end of the second air chamber  69  in the vertical direction. The communication port  104  is located at the intersection at which the fifth wall  85  and the eleventh wall  95  intersect together. In another viewpoint, the communication port  104  is located at the lower end of the third air chamber  72  in the vertical direction. 
     Herein, the communication port  107  is located above the upper limit mark  28  in the vertical direction, as illustrated in  FIG. 7 . The upper limit mark  28  is located below the fifth wall  85  in the vertical direction. For this reason, the upper limit mark  28  is located below the opening  128  of the ink injection section  101  in the vertical direction. This makes it easier to avoid an event where ink would surpass the upper limit mark  28  and arrive at the opening  128  when the worker is injecting the ink into the tank  9 A from the ink injection section  101 . For this reason, it is easier to avoid an event where the ink overflows from the ink injection section  101  when the worker is injecting the ink into the tank  9 A from the ink injection section  101 . 
     In the first embodiment, the Z-axis direction corresponds to a direction intersecting with the horizontal direction, the storage section  65  corresponds to a liquid storage section, the ink injection section  101  corresponds to a liquid injection section, the opening  128  corresponds to a liquid injection port, and the third air chamber  72  corresponds to an air chamber. The air communication port  115 , the first air chamber  68 , the communication port  102 , the second air chamber  69 , and the first communicating passage  71  correspond to an air introduction section. The second communicating passage  73  corresponds to a communicating passage, each of the first buffer chamber  74  and the second buffer chamber  75  corresponds to a collection section, and the case  61  corresponds to a case member. The support sections  127  correspond to ribs. The second wall  82  and the third wall  83  correspond to two inner walls that face one another across ribs. One among either the third passage  153  or the fifth passage  155  corresponds to a first portion and the other among the third passage  153  and the fifth passage  155  corresponds to a second portion. 
     In the first embodiment, the first buffer chamber  74  and the second buffer chamber  75  are provided to the second communicating passage  73 . For this reason, even though, for example, the ink inside the storage section  65  might flow back toward the third air chamber  72  side through the second communicating passage  73 , the ink can be captured at the first buffer chamber  74  and the second buffer chamber  75 , and therefore the ink inside the storage section  65  can be more easily prevented from arriving at the third air chamber  72 . This makes it easier to avoid an event where the ink inside the storage section  65  leaks out from the air communication port  115  to the outside of the tank  9 A. The number of the buffer chambers, however, is not limited to being two, namely, the first buffer chamber  74  and the second buffer chamber  75 . One or a number three or higher could also be employed as the number of buffer chambers. 
     In the first embodiment, the first buffer chamber  74  and the second buffer chamber  75  are provided to the fifth passage  155  ( FIG. 9 ) of the second communicating passage  73 . In a case where the ink inside the storage section  65  flows back toward the third air chamber  72  side through the second communicating passage  73 , then the ink that has flowed back will at the fifth passage  155  be flowing from the bottom to the top in the Z-axis direction. The orientation of this flow is opposite to the orientation of when the air is flowing from the third air chamber  72  side toward the storage section  65  side. The ink  141  that flows from the bottom to the top through the fifth passage  155  will collect going from the bottom toward the top of the first buffer chamber  74 , as illustrated in  FIG. 10A , which is a cross-sectional view of when the first buffer chamber  74  is cut in the YZ plane. For this reason, the liquid level of the ink  141  that has arrived at the first buffer chamber  74  rises from the bottom toward the top of the first buffer chamber  74 . 
     Here, in a case where, for example, the ink  141  flowing back from the storage section  65  side toward the third air chamber  72  side flows from the top toward the bottom in the fifth passage  155 , then the ink  141  flowing back flows toward the first buffer chamber  74  from above the first buffer chamber  74 . At this time, as illustrated in  FIG. 10B , conceivably either the ink  141  could fail to arrive at the interior of the first buffer chamber  74  and would instead end up passing through the first buffer chamber  74 , or the ink  141  that has arrived at inside the first buffer chamber  74  could end up flowing out from the first buffer chamber  74  by the action of gravity. In such an event, it is not possible to fully exploit the capacity of the first buffer chamber  74 . 
     By contrast to such an event, in the present embodiment, the ink  141  that has arrived at the first buffer chamber  74  will collect going from the bottom toward the top of the first buffer chamber  74 , and therefore it is possible to efficiently exploit the capacity of the first buffer chamber  74 . 
     Also, according to the present embodiment, the first buffer chamber  74  has a smaller cross-sectional area than the cross-sectional area of the third air chamber  72 , and therefore the distance in the horizontal direction from the inner wall of the first buffer chamber  74  to the second communicating passage  73  is shorter than the distance in the horizontal direction from the inner wall of the third air chamber  72  to the second communicating passage  73 . For this reason, the ink inside the first buffer chamber  74  more easily arrives at the second communicating passage  73  as compared to the ink that has flowed into the third air chamber  72 . In other words, the ink inside the first buffer chamber  74  more easily returns to the second communicating passage  73  as compared to the ink that has flowed into the third air chamber  72 . This makes it possible to reduce the amount of ink that remains inside the first buffer chamber  74  beyond the amount of ink that remains inside the third air chamber  72 . As a result, in a case where ink in an amount that can be captured with the first buffer chamber  74  flows out to the third air chamber  72  side from the storage section  65 , then the amount of ink that remains in the first buffer chamber  74  can be reduced and therefore waste of the ink can be mitigated. 
     In the first embodiment, the first buffer chamber  74  is provided to the upstream side of the second buffer chamber  75 , and therefore ink that has overflowed from the second buffer chamber  75  can be captured with the first buffer chamber  74 . This makes it easy to even further prevent the ink inside the storage section  65  from arriving at the third air chamber  72 , and therefore makes it easy to even further avoid an event where the ink inside the storage section  65  leaks out from the air communication port  115  to the outside of the tank  9 A. 
     In the first embodiment, as stated above, the first buffer chamber  74  is located above the opening  128  in the Z-axis direction. According to this configuration, even though, for example, the ink might be injected to capacity up until the opening  128 , the ink is less likely to advance to a position higher than the opening  128 , and therefore it is easier to avoid an event where the first buffer chamber  74  ends up being filled with the ink. To easily avoid the event where the first buffer chamber  74  ends up being filled with the ink, it suffices for at least a part of the first buffer chamber  74  to be located above the opening  128  in the Z-axis direction. In this configuration, it is still possible to make it easier to avoid the event where the first buffer chamber  74  ends up being filled with the ink. 
     In the first embodiment, the communication port  107  is located above the upper limit mark  28  in the vertical direction. For this reason, it is easier to avoid an event where the ink inside the storage section  65  arrives at the communication port  107 . As a result, it is easier to prevent the ink inside the storage section  65  from flowing from the communication port  107  to inside the second communicating passage  73 , and therefore it is easier to avoid an event where the ink inside the storage section  65  leaks out from the air communication port  115  to the outside of the tank  9 A. 
     In the first embodiment, the communication port  107  is located at the upper end of the storage section  65  in the vertical direction. For this reason, in the state where the printer  1  is used, it is easier to prevent the ink inside the storage section  65  from flowing from the communication port  107  to inside the second communicating passage  73 . As a result, it is easier to avoid an event where the ink inside the storage section  65  leaks out from the air communication port  115  to the outside of the tank  9 A. 
     In the first embodiment, the reversal section  165  is provided to the second communicating passage  73 . The second communicating passage  73  reverses at the reversal section  165  from an orientation going vertically downward from vertically above to an orientation going vertically upward from vertically below. For this reason, when the posture of the tank  9 A is not turned in the state where the ink has entered into the second communicating passage  73  from the communication port  107 , then the ink that has entered into the second communicating passage  73  does not readily surpass the reversal section  165  and flow back to the upstream side of the fifth passage  155 . For this reason, it is easy to even further prevent the ink inside the storage section  65  from arriving at the third air chamber  72 . 
     In the first embodiment, the support sections  127  that project out toward the sheet member  63  side from the first wall  81  of the case  61  are provided. For this reason, the sheet member  63  can be supported with the support sections  127  when, for example, the sheet member  63  is pressed toward the first wall  81  of the case  61 , i.e., toward the inside of the storage section  65 . This makes it easier to regulate flexure of the sheet member  63 . As a result, it is possible to mitigate any contraction of the capacity inside the storage section  65  when, for example, the sheet member  63  is pressed toward the inside of the storage section  65 . For this reason, it is easier to avoid an event where the ink inside the storage section  65  would flow from the communication port  107  into the second communicating passage  73  when, for example, the sheet member  63  is pressed toward the inside of the storage section  65 . 
     In the first embodiment, there are the plurality of support sections  127  provided to inside the storage section  65 , and therefore it is possible to further mitigate any contraction of the capacity inside the storage section  65  when the sheet member  63  is pressed toward the inside of the storage section  65 . For this reason, it is easy to even further avoid an event where the ink inside the storage section  65  would flow from the communication port  107  into the second communicating passage  73  when, for example, the sheet member  63  is pressed toward the inside of the sheet member  63 . 
     In the first embodiment, the sheet member  63  is bonded to the bonding sections  64  provided to the support sections  127 . For this reason, positional displacement of the sheet member  63  is easily prevented. Also, any increase in the capacity inside the storage section  65  can be mitigated at times such as when, for example, the pressure inside the storage section  65  becomes higher than the atmospheric pressure. 
     The above embodiment illustrates an example where the tank  9 A is constituted of the case  61  and the sheet member  63 , but the configuration of the tank  9 A is not limited thereto. An example where, for example, the case  61  is constituted of a plurality members could also be employed as the configuration of the tank  9 A. Examples where the case  61  is constituted of a plurality of members include an example where the first wall  81  of the case  61  is constituted of another member. Further, examples where the first wall  81  of the case  61  is constituted of another member include an example where the first wall  81  is constituted of a sheet member different from the sheet member  63 . This example would be a configuration where the case  61  is sandwiched between the sheet member  63  and the other sheet member. The tank  9 A can be configured by this configuration, as well. 
     In the above first embodiment, it would also be possible to employ a configuration where the depth of the first buffer chamber  74  is less on the lower side than the upper side of the first buffer chamber  74  in the Z-axis direction, as illustrated in  FIG. 11A . In the example illustrated in  FIG. 11A , a slope  168  is provided to inside the first buffer chamber  74 . The slope  168  is sloped at an orientation which increasingly approaches the sheet member  63  side going from the upper side toward the lower side of the first buffer chamber  74 , i.e., with which the first buffer chamber  74  becomes increasingly shallow going from the upper side toward the lower side of the first buffer chamber  74 . 
     According to this configuration, ink that has collected in the first buffer chamber  74  more readily returns from the lower side of the first buffer chamber  74  to the second communicating passage  73 , due to the action of gravity toward the lower side of the first buffer chamber  74 . At this time, when the configuration is one where the first buffer chamber  74  is shallower at the lower side than the upper side, the ink inside the first buffer chamber  74  more readily approaches the second communicating passage  73  at the lower side more than the upper side of the first buffer chamber  74 . For this reason, going from the upper side toward the lower side of the first buffer chamber  74 , the ink inside the first buffer chamber  74  becomes increasingly easier to guide to the second communicating passage  73 . As a result, ink that has collected in the first buffer chamber  74  is more readily returned to the second communicating passage  73 . This makes it possible to even further reduce the amount of ink that remains in the first buffer chamber  74 , and therefore makes it possible to even further mitigate waste of the ink. 
     As a method for causing the first buffer chamber  74  to become shallower at the lower side than the upper side, it would also be possible to employ, for example, a method where the slope  168  is configured so as to be stepwise, as illustrated in  FIG. 11B . A similar effect is still obtained with this configuration, too. A configuration where the slope  168  is also provided in the second buffer chamber  75  could also be employed. When the slope  168  is provided to the second buffer chamber  75  as well, the amount of ink that remains in the second buffer chamber  75  can also be further reduced, and therefore waste of the ink can be even further mitigated.  FIGS. 11A and 11B , it should be noted, each illustrate cross-sectional views of when the first buffer chamber  74  is cut in the YZ plane. 
     (Second Embodiment) 
     A tank  9 B in the second embodiment shall now be described. In the second embodiment, configurations that are the same as in the first embodiment are assigned the same reference numerals as in the first embodiment and a detailed description thereof is omitted. The tank  9 B, as illustrated in  FIG. 12 , has a case  171  and the sheet member  63 . The case  171  is constituted of, for example, a synthetic resin such as nylon or polypropylene. The tank  9 B has a configuration where the case  171  and the sheet member  63  are bonded together. The bonding sections  64  are provided to the case  171 .  FIG. 12  depicts the bonding sections  64  with hatching in order to better illustrate the configuration. The sheet member  63  is bonded to the bonding sections  64  of the case  171 . In the present embodiment, the case  171  and the sheet member  63  are bonded together by welding. 
     The tank  9 B, as illustrated in  FIG. 13 , has a storage section  181  and a communicating section  183 . The communicating section  183  has a first air chamber  184 , a first communicating passage  185 , a first air chamber  186 , a second communicating passage  187 , and a buffer chamber  188 . The ink in stored inside the storage section  181 .  FIG. 13  illustrates a state where the tank  9 B is viewed from the sheet member  63  side, and depicts the case  171  with the sheet member  63  in between. The storage section  181 , the first air chamber  184 , the first communicating passage  185 , the second air chamber  186 , and the second communicating passage  187  are partitioned from one another by the bonding sections  64 . The buffer chamber  188  is provided to inside the second communicating passage  187 . 
     The case  171  has the first wall  81  through eighth wall  88 , similarly with respect to the case  61 . The case  171  also has a ninth wall  191 , a tenth wall  192 , an eleventh wall  193 , and a twelfth wall  194 . The first air chamber  184 , the first communicating passage  185 , and the second air chamber  186  are arranged on the side opposite to the storage section  181  side from the fifth wall  85 . When the first wall  81  is seen in plan view from the sheet member  63  side, the storage section  181  is surrounded by the second wall  82 , the third wall  83 , the fourth wall  84 , the fifth wall  85 , the ninth wall  191 , and the tenth wall  192 . 
     When the first wall  81  is seen in plan view from the sheet member  63  side, then the first air chamber  184 , the first communicating passage  185 , and the second air chamber  186  are surrounded by the fifth wall  85 , the sixth wall  86 , the seventh wall  87 , the eighth wall  88 , the ninth wall  191 , and the tenth wall  192 . The first wall  81  of the storage section  181  and the first wall  81  of the first air chamber  184  and second air chamber  186  are the same wall as one another. In other words, in the present embodiment, the first wall  81  is shared among the storage section  181 , the first air chamber  184 , and the second air chamber  186 . The ink injection section  101 , the supply port  113 , and the air communication port  115  are also provided to the case  171 . The places of arrangement of the ink injection section  101 , the supply port  113 , and the air communication port  115  are each similar to as in the first embodiment. 
     The second wall  82 , the third wall  83 , the fourth wall  84 , the fifth wall  85 , the ninth wall  191 , and the tenth wall  192  each intersect with the first wall  81 , as illustrated in  FIG. 14 . The second wall  82  and the third wall  83  are provided to positions that face each other across the first wall  81  in the X-axis direction. The fourth wall  84  and the fifth wall  85  are provided to positions that face each other across the first wall  81  in the Z-axis direction. The third wall  83  intersects with each of the fourth wall  84  and the fifth wall  85 . The ninth wall  191  is located to the side opposite to the storage section  181  side from the fifth wall  85 . In other words, the ninth wall  191  is located above the fifth wall  85  in the vertical direction. The ninth wall  191  faces the fourth wall  84 . The second wall  82  intersects with each of the fourth wall  84  and the ninth wall  191 . The tenth wall  192  is located between the second wall  82  and the third wall  83 . The tenth wall  192  faces the second wall  82 . The tenth wall  192  intersects with each of the fifth wall  85  and the ninth wall  191 . 
     The second wall  82 , the third wall  83 , the fourth wall  84 , the fifth wall  85 , the ninth wall  191 , and the tenth wall  192  project out to the +Y-axis direction form the first wall  81 . Due to this, where the first wall  81  is a main wall, a recess  201  is configured by the second wall  82 , the third wall  83 , the fourth wall  84 , the fifth wall  85 , the ninth wall  191 , and the tenth wall  192  which extend in the +Y-axis direction from the main wall. The recess  201  is configured with an orientation so as to be concave going towards the −Y-axis direction. The recess  201  forms an opening going toward the +Y-axis direction, i.e., toward the sheet member  63  ( FIG. 12 ) side. In other words, the recess  201  is provided at an orientation so as to be concave going toward the −Y-axis direction, i.e., toward the side opposite to the sheet member  63  ( FIG. 12 ) side. When the sheet member  63  is bonded to the case  171 , the recess  201  is closed off by the sheet member  63 , thus constituting the storage section  181 . The first wall  81  through eighth wall  88 , the ninth wall  191 , and the tenth wall  192  each are not limited to being flat walls, and may also be ones that comprise irregularities. 
     The sixth wall  86  projects out from the ninth wall  191  toward the side of the ninth wall  191  opposite to the fourth wall  84  side, i.e., toward the +Z-axis direction side of the ninth wall  191 , as illustrated in  FIG. 13 . The seventh wall  87  projects out from the fifth wall  85  toward the side of the fifth wall  85  opposite to the fourth wall  84  side, i.e., toward the +Z-axis direction side of the fifth wall  85 . The sixth wall  86  and the seventh wall  87  are provided to positions facing one another across the first air chamber  184 , the first communicating passage  185 , and the second air chamber  186  in the X-axis direction. The eighth wall  88  is provided to a position facing the fifth wall  85  and the ninth wall  191  across the first air chamber  184 , the first communicating passage  185 , and the second air chamber  186  in the Z-axis direction. The sixth wall  86  intersects with each of the ninth wall  191  and the eighth wall  88 . The seventh wall  87  intersects with each of the fifth wall  85  and the eighth wall  88 . 
     The eleventh wall  193  and the twelfth wall  194  are provided between the sixth wall  86  and the seventh wall  87 . Between the first air chamber  184  and the second air chamber  186 , a separation is formed in the X-axis direction by the eleventh wall  193  and the twelfth wall  194 . The eleventh wall  193  is provided to the seventh wall  87  side more than the sixth wall  86 , and faces the sixth wall  86 . The twelfth wall  194  is provided to the sixth wall  86  side more than the seventh wall  87 , and faces the seventh wall  87 . The twelfth wall  194  is provided to the seventh wall  87  side more than the eleventh wall  193 . 
     The sixth wall  86 , the seventh wall  87 , the eighth wall  88 , the eleventh wall  193 , and the twelfth wall  194  each project out in the +Y-axis direction from the first wall  81 , as illustrated in  FIG. 14 . The sixth wall  86 , the ninth wall  191 , the eleventh wall  193 , and the eighth wall  88 , which extend in the +Y-axis direction from the first wall  81 , together constitute a recess  202 . The fifth wall  85 , the seventh wall  87 , the eighth wall  88 , and the twelfth wall  194 , which extend in the +Y-axis direction from the first wall  81 , together constitute a recess  203 . 
     The recess  202  and the recess  203  each form an opening going toward the +Y-axis direction, i.e., toward the sheet member  63  ( FIG. 12 ) side. In other words, the recess  202  and the recess  203  are each provided at an orientation so as to be concave going toward the −Y-axis direction, i.e., toward the side opposite to the sheet member  63  ( FIG. 12 ) side. Then, when the sheet member  63  is bonded to the case  171 , the recess  202  is closed off by the sheet member  63 , thus constituting the first air chamber  184 . Likewise, when the sheet member  63  is bonded to the case  171 , the recess  203  is closed off by the sheet member  63 , thus constituting the second air chamber  186 . The amounts by which the second wall  82  through eighth wall  88  and the ninth wall  191  through twelfth wall  194  project out from the first wall  81  are set so as to be the same amount of projection to one another. 
     The first communicating passage  185  is provided between the eleventh wall  193  and the twelfth wall  194 , as illustrated in  FIG. 13 , and forms communication between the first air chamber  184  and the second air chamber  186 . The second communicating passage  187  is provided to the outside of the storage section  181 , the first air chamber  184 , the first communicating passage  185 , and the second air chamber  186 . The second communicating passage  187  forms communication between the second air chamber  186  and the storage section  181 . A communication port  204  is provided to the eleventh wall  193 . The first air chamber  184  is communicated to the first communicating passage  185  via the communication port  204 . A communication port  205  is also provided to the twelfth wall  194 . The second air chamber  186  is communicated to the first communicating passage  185  via the communication port  205 . The first communicating passage  185  is meandering. The first air chamber  184  is communicated to the second air chamber  186  after meandering through the first communicating passage  185 . 
     The extended section  105 , as in the first embodiment, is also provided to the case  171 , as illustrated in  FIG. 14 . In the case  171 , as well, the second communicating passage  187  is provided to the extended section  105 . In the case  171 , as well, the extended section  105  has the site  105 A, the site  105 B, the site  105 C, and the site  105 D. Similarly to the first embodiment, the second communicating passage  187  is configured as the groove  117  that is provided to the extended section  105  at an orientation so as to be concave going toward the side opposite to the sheet member  63  side. 
     The second communicating passage  187  has the communication port  106  and the communication port  107 , as illustrated in  FIG. 13 . The communication port  106  is an opening that opens toward the inside of the second air chamber  186 . The communication port  107  is an opening that opens toward the inside of the storage section  181 . The second air chamber  186  passes from the communication port  106  via the second communicating passage  187  through the communication port  107  to the storage section  181 . By the above, the storage section  181  passes via the second communicating passage  187 , the second air chamber  186 , the first communicating passage  185 , the first air chamber  184 , and the air communication port  115  to the exterior of the tank  9 B. This means that the communicating section  183  establishes communication between the air communication port  115  and the storage section  181 . The air that has flowed in from the air communication port  115  into the first air chamber  184  flows into the second air chamber  186  via the first communicating passage  185 . Then, the air that has flowed into the second air chamber  186  flows in to the inside of the storage section  181  via the second communicating passage  187 . 
     As illustrated in  FIG. 14 , in the case  171 , a recess  206  is provided to the side of the sixth wall  86  opposite to the recess  202  side. The recess  206  and the recess  202  are lined up sandwiching the sixth wall  86  in the X-axis direction. The recess  206  is provided at an orientation so as to be concave going toward the side opposite to the sheet member  63  ( FIG. 12 ) side. The recess  206  is provided to inside the groove  117 . The recess  206  can also be regarded as being a configuration with which the depth at a part of the groove  117  is increased. When the sheet member  63  is bonded to the case  171 , the groove  117  is closed off by the sheet member  63 , thus constituting the second communicating passage  187 , as illustrated in  FIG. 13 . Then, in the second communicating passage  187 , the recess  206  is constituted as a buffer chamber  188 . Herein, the cross-sectional area of the buffer chamber  188  in the horizontal direction (the XY plane) is wider than the cross-sectional area of the second communicating passage  187  in the horizontal direction (the XY plane). The cross-sectional area of the buffer chamber  188  in the horizontal direction (the XY plane) is narrower than the cross-sectional area of the second air chamber  186  in the horizontal direction (the XY plane). 
     In the tank  9 B, as well, as with the first embodiment, the sheet member  63  is bonded to the bonding sections  64  at each of the two support sections  127 . In the tank  9 B, as well, as with the first embodiment, the gap between the third wall  83  and the support section  127 A, the gap between the support section  127 A and the support section  127 B, and the gap between the second wall  82  and the support section  127 B are set so as to be equal to one another. Also, in the tank  9 B, as well, as with the first embodiment, the second communicating passage  187 , as illustrated in  FIG. 15 , can be sectioned into the first passage  151 , the second passage  152 , the third passage  153 , the fourth passage  154 , the fifth passage  155 , and the sixth passage  156 . Also, in the tank  9 B, as well, as with the first embodiment, the orientation of the flow path is reversed at each of the reversal section  161  and the reversal section  165 . At each of the bend section  162 , the bend section  163 , and the bend section  164 , the orientation of the flow path is bent. 
     Also, in the tank  9 B, as well, as with the first embodiment, the buffer chamber  188  is located above the fifth wall  85  in the Z-axis direction. For this reason, in the tank  9 B, as well, as with the first embodiment, the buffer chamber  188  is located above the opening  128  ( FIG. 7 ) of the ink injection section  101 . Moreover, as with the first embodiment, in order to easily avoid the event where the buffer chamber  188  ends up being filled with the ink, it suffices for at least a part of the buffer chamber  188  to be located above the opening  128  in the Z-axis direction. In this configuration, it is still possible to make it easier to avoid the event where the buffer chamber  188  ends up being filled with the ink. 
     The buffer chamber  188  is provided to the fifth passage  155  in the second communicating passage  187 . The buffer chamber  188  is arranged between the ninth wall  191  and the eighth wall  88  in the Z-axis direction. The place of arrangement of the buffer chamber  188  is not limited to being the fifth passage  155 . Any of the sites of the first passage  151  through sixth passage  156  could also be employed as the place of arrangement of the buffer chamber  188 . Furthermore, any of the sites of the reversal section  161 , the reversal section  165 , the bend section  162 , the bend section  163 , the bend section  164 , and the bend section  166  could also be employed as the place of arrangement of the buffer chamber  188 . 
     In the tank  9 B, the communication port  106  is located at the intersection at which the seventh wall  87  and the fifth wall  85  intersect together. In another viewpoint, the communication port  106  is located at the lower end of the second air chamber  186  in the vertical direction. The communication port  107  is located at the intersection at which the second wall  82  and the ninth wall  191  intersect together. In another viewpoint, the communication port  107  is located at the upper end of the storage section  181  in the vertical direction. In the present embodiment, the communication port  107  is located below the buffer chamber  188  in the vertical direction. The communication port  204  is located at the intersection at which the ninth wall  191  and the eleventh wall  193  intersect together. In another viewpoint, the communication port  204  is located at the lower end of the first air chamber  184  in the vertical direction. 
     As with the first embodiment, the communication port  107  is located above the upper limit mark  28  in the vertical direction, as illustrated in  FIG. 13 . The upper limit mark  28  is located below the fifth wall  85  in the vertical direction. For this reason, the upper limit mark  28  is located below the opening  128  of the ink injection section  101  in the vertical direction. This makes it easier to avoid an event where ink would surpass the upper limit mark  28  and arrive at the opening  128  when the worker is injecting the ink into the tank  9 B from the ink injection section  101 . For this reason, it is easier to avoid an event where the ink overflows from the ink injection section  101  when the worker is injecting the ink into the tank  9 B from the ink injection section  101 . 
     As stated above, the ninth wall  191  is located on the side opposite to the storage section  181  side more than the fifth wall  85 . In other words, the ninth wall  191  is located above the fifth wall  85  in the Z-axis direction. Then, the communication port  107  is located at the intersection at which the second wall  82  and the ninth wall  191  intersect together. For this reason, the communication port  107  is located above the fifth wall  85  in the Z-axis direction. Herein, the opening  128  ( FIG. 7 ) of the ink injection section  101  is provided to the fifth wall  85 , as in the first embodiment. Accordingly, the communication port  107  is located above the opening  128  ( FIG. 7 ) in the Z-axis direction. 
     The communication port  205  is located to the eighth wall  88  side more than the intersection at which the fifth wall  85  and the twelfth wall  194  intersect together, as illustrated in  FIG. 16 , which is an enlarged view of the A section in  FIG. 15 . In another viewpoint, the communication port  205  is located above a lower end  211  of the second air chamber  186  in the vertical direction. Moreover, in the tank  9 B, the communication port  205  is located to the fifth wall  85  side more than the intersection at which the eighth wall  88  and the twelfth wall  194  intersect together. In another viewpoint, the communication port  205  is located below an upper end  213  of the second air chamber  186  in the vertical direction. 
     In the present embodiment, the communication port  205  is located above a position that is raised by a distance H 1  from the lower end  211 . The dimension H 1  is a dimension of the communication port  106  in the Z-axis direction. The communication port  205  is also located below a position that has been lowered by a dimension H 2  from the upper end  213 . The dimension H 2  is a dimension of the communication port  205  in the Z-axis direction. 
     In the second embodiment, the Z-axis direction corresponds to a direction intersecting with the horizontal direction, the storage section  181  corresponds to a liquid storage section, the ink injection section  101  corresponds to a liquid injection section, the opening  128  corresponds to a liquid injection port, the second air chamber  186  corresponds to an air chamber, and the communication port  107  corresponds to a connecting port. The air communication port  115 , the first air chamber  184 , and the first communicating passage  185  correspond to an air introduction system. The second communicating passage  187  corresponds to a communicating passage and the case  171  corresponds to a case member. The second wall  82  and the third wall  83  correspond to two inner walls that face one another across ribs. One among either the third passage  153  or the fifth passage  155  corresponds to a first portion and the other among the third passage  153  and the fifth passage  155  corresponds to a second portion. 
     In the second embodiment, effects similar to those of the first embodiment are also obtained. In the second embodiment, as stated above, the communication port  205  is located above the lower end  211  of the second air chamber  186  ( FIG. 16 ). For this reason, when, for example, ink has flowed in from the storage section  181  to inside the second air chamber  186  via the second communicating passage  187 , it is easy to avoid an event where the ink that has flowed into the second air chamber  186  ends up directly arriving at the communication port  205 . In other words, the ink that has flowed in from the storage section  181  to inside the second air chamber  186  via the second communicating passage  187  is readily stopped inside the second air chamber  186 . As a result of this, it is easy to even further avoid an event where the ink inside the storage section  181  leaks out from the air communication port  115  to the outside of the tank  9 B. 
     Also, in the second embodiment, as stated above, the communication port  205  is located below the upper end  213  of the second air chamber  186  ( FIG. 16 ). For this reason, when the vertical orientation of the tank  9 B is inverted in a state where, for example, ink has flowed in from the storage section  181  to inside the second air chamber  186  via the second communicating passage  187 , then it is easy to avoid an event where the ink inside the second air chamber  186  would arrive directly at the communication port  205 . In other words, even in a state where the vertical orientation of the tank  9 B has been inverted, the ink that has flowed in from the storage section  181  to inside the second air chamber  186  via the second communicating passage  187  is readily stopped inside the second air chamber  186 . As a result of this, it is easy to even further avoid an event where the ink inside the storage section  181  leaks out from the air communication port  115  to the outside of the tank  9 B. 
     Further, in the second embodiment, as stated above, the communication port  205  is located above the position that is raised by the dimension H 1  from the lower end  211 . According to this configuration, when, for example, ink has flowed in from the storage section  181  to inside the second air chamber  186  via the second communicating passage  187 , it is easy to avoid an event where the ink that has flowed into the second air chamber  186  ends up moving along the fifth wall  85  from the communication port  106  and directly arriving at the communication port  205 . In other words, the ink that has flowed in from the storage section  181  to inside the second air chamber  186  via the second communicating passage  187  is readily stopped inside the second air chamber  186 . As a result of this, it is easy to even further avoid an event where the ink inside the storage section  181  leaks out from the air communication port  115  to the outside of the tank  9 B. 
     Also, in the second embodiment, as stated above, the communication port  205  is located below the position that is lowered by the dimension H 2  from the upper end  213 . According to this configuration, when the vertical orientation of the tank  9 B is inverted in a state where, for example, ink has flowed in from the storage section  181  to inside the second air chamber  186  via the second communicating passage  187 , it is easy to avoid an event where the ink inside the second air chamber  186  ends up directly arriving at the communication port  205 . In other words, even in a state where the vertical orientation of the tank  9 B has been inverted, the ink that has flowed in from the storage section  181  to inside the second air chamber  186  via the second communicating passage  187  is readily stopped inside the second air chamber  186 . As a result of this, it is easy to even further avoid an event where the ink inside the storage section  181  leaks out from the air communication port  115  to the outside of the tank  9 B. 
     In the second embodiment, the ninth wall  191  is located to the eighth wall  88  side more than the fifth wall  85 , as illustrated in  FIG. 17 . In another viewpoint, the ninth wall  191  is located vertically above the fifth wall  85 . In other words, the height of the ninth wall  191  from the fourth wall  84  is greater than the height of the fifth wall  85  from the fourth wall  84 . The tenth wall  192  is provided between the ninth wall  191  and the fifth wall  85 . This configuration causes a recess  221  to be configured in the storage section  181 . The recess  221  is provided at an orientation so as to be concave going toward the eighth wall  88  side more than the fifth wall  85 , i.e., going toward the +Z-axis direction side more than the fifth wall  85 . In the recess  221 , the communication port  107  is provided to a position that faces the tenth wall  192 . For this reason, the communication port  107  is located to the ninth wall  191  side more than the fifth wall  85 . In another viewpoint, the communication port  107  is located vertically above the fifth wall  85 . In the second embodiment, the recess  221  corresponds to an upper region. 
     As stated above, the opening  128  ( FIG. 7 ) of the ink injection section  101  is provided to the fifth wall  85 , as in the first embodiment. For this reason, the communication port  107  is located above the opening  128  ( FIG. 7 ) in the Z-axis direction. According to this configuration, the ink inside the storage section  181  will less readily arrive at the communication port  107 . For this reason, the possibility that the ink inside the storage section  181  could flow in to inside the second communicating passage  187  is reduced. As a result, the possibility that the ink inside the storage section  181  could arrive at the second air chamber  186  can be reduced, and therefore the possibility that the ink inside the storage section  181  could leak out of the tank  9 B from the second air chamber  186  via the first communicating passage  185  and the first air chamber  184  can be reduced. 
     Moreover, as illustrated in, for example,  FIG. 17 , it is conceivable that when the ink is being injected from the ink injection section  101 , the liquid level of the ink inside the tank  9 B could end up reaching the fifth wall  85 . When the liquid level of the ink reaches the fifth wall  85 , then the ink reaches the opening  128  of the ink injection section  101 . In the tank  9 B, even in such a case, the air space is still maintained in the recess  221 . When the cap  143  is implemented after injection, as illustrated in  FIG. 18 , then it is believed that there will be higher pressure inside the storage section  181  and the liquid level of the ink will rise in the recess  221 . In the tank  9 B, the air space is still present in the recess  221  even when such an event occurs, and therefore, the risen liquid surface will less readily arrive at the communication port  107 . For this reason, compared to the first embodiment, it is easy to even further prevent the ink inside the storage section  181  from flowing in from the communication port  107  to inside the second communicating passage  187 . As a result of this, it is easy to even further avoid an event where the ink inside the storage section  181  leaks out from the air communication port  115  to the outside of the tank  9 B. 
     In the present embodiment, the volume of the recess  221  is greater than the volume, out of the space surrounded by the side wall  129  of the ink injection section  101 , into which the cap  143  is fitted. This makes it possible, even though the cap  143  may be mounted in a state where the space that is surrounded by the side wall  129  is filled to capacity with ink, to use the volume of the recess  221  to capture the amount of ink that is pushed into the storage section  181  by the cap  143 . As a result of this, even though the space that is surrounded by the side wall  129  may be filled to capacity with ink, the ink inside the storage section  181  will less readily reach the communication port  107 . Accordingly, it is easy to even further prevent the ink inside the storage section  181  from flowing into the second communicating passage  187  from the communication port  107 . As a result of this, it is easy to even further avoid an event where the ink inside the storage section  181  leaks out from the air communication port  115  to the outside of the tank  9 B. 
     The embodiment described above illustrates an example where the tank  9 B is constituted of the case  171  and the sheet member  63 , but the configuration of the tank  9 B is not limited thereto. An example where, for example, the case  171  is constituted of a plurality members could also be employed as the configuration of the tank  9 B. Examples where the case  171  is constituted of a plurality of members include an example where the first wall  81  of the case  171  is constituted of another member. Further, examples where the first wall  81  of the case  171  is constituted of another member include an example where the first wall  81  is constituted of a sheet member different from the sheet member  63 . This example would be a configuration where the case  171  is sandwiched between the sheet member  63  and the other sheet member. The tank  9 B can be configured by this configuration, as well. 
     In the second embodiment described above, as well, as with the first embodiment, the configuration where the slop  168  illustrated in  FIGS. 11A and 11B  has been added to the buffer chamber  188  could also be employed. According to this configuration, as with the first embodiment, the amount of ink that remains in the buffer chamber  188  can also be further reduced, and therefore waste of the ink can be even further mitigated. 
     In each of the embodiments above, the plurality of tanks  9  are not built into the first case  3 , which covers the mechanism unit  10 . In other words, each of the embodiments above employs a configuration where the plurality of tanks  9  are arranged on the outside of the first case  3 . A configuration where the plurality of tanks  9  are built into the first case  3 , however, could also be employed. Below, a configuration where the plurality of tanks  9  are built into the case shall be described, using the example of a multifunction peripheral, which is one example of a liquid jet apparatus. 
     A multifunction peripheral  500  in the present embodiment has a printer  503  and a scanner unit  505 , as illustrated in  FIG. 19 . In the multifunction peripheral  500 , the printer  503  and the scanner unit  505  are stacked onto one another. In the state where the printer  503  is used, the scanner unit  505  is located vertically above the printer  503 . Here, in  FIG. 19 , XYZ axes have been assigned, which are coordinate axes that are orthogonal to one another. XYZ axes have been assigned where necessary in the subsequently illustrated drawings, as well. The XYZ axes in  FIG. 19  confirm with the XYZ axes in  FIG. 1 , as do the XYZ axes in  FIG. 19  and onward. In the multifunction peripheral  500 , configurations that are similar to the printer  1  are assigned the same reference numerals as in the printer  1  and a detailed description thereof is omitted. 
     The scanner unit  505  is of the flatbed-type, and has an imaging element (not shown) such as an image sensor, as well as a platen and a covering. Via the imaging element, the scanner unit  505  is able to read an image that has been recorded onto a medium such as paper, as image data. For this reason, the scanner unit  505  functions as an apparatus for reading images and the like. The scanner unit  505  is configured so as to be rotatable relative to a case  507  of the printer  503 , as illustrated in  FIG. 20 . A surface on the printer  503  side of the platen of the scanner unit  505  covers the case  507  of the printer  503  and also has a function as a covering for the printer  503 . 
     The printer  503  is able to print onto the printing medium P of printing paper or the like using ink, which is one example of a liquid. The printer  503 , as illustrated in  FIG. 21 , has the case  507  as well as the plurality of tanks  9 , which are one example of a liquid storage container. The case  507  is an integrally formed article constituting an outer shell of the printer  503 , and houses a mechanism unit  511  of the printer  503 . The plurality of tanks  9  are stored inside the case  507 , and each of the plurality of tanks  9  stores ink that is supplied for printing. In the printer  503 , there are four of the tanks  9  provided. The four tanks  9  have different types of ink from one another. The four types of black, yellow, magenta, and cyan are employed as the types of ink in the printer  503 . There is one tank  9  provided for each of the different kinds of ink. 
     The printer  503  also has an operation panel  512 . Provided to the operation panel  512  are a power source button  513 , another operation button  514 , and the like. The worker who operates the printer  503  can face the operation panel  512  and in this state operate the power source button  513  or the operation button  514 . In the printer  503 , the surface to which the operation panel  512  is provided is understood to be the front surface. On the front surface of the printer  503 , a window section  515  is provided to the case  507 . The window section  515  is optically transparent. The four tanks  9  described above are provided to positions overlapping with the window section  515 . For this reason, the worker is able to view the four tanks  9  through the window section  515 . 
     In the printer  503 , the sites of each of the tanks  9  that face the window section  515  are optically transparent. The inks inside the tanks  9  can be viewed from the optically transparent sites of each of the tanks  9 . As such, viewing the four tanks  9  via the window section  515  allows the worker to view the amount of ink that is in each of the tanks  9 . In the printer  503 , because the window section  515  is provided to the front surface of the printer  503 , the operator can face the operation panel  512  and in this state view each of the tanks  9  from the window section  515 . For this reason, the worker can ascertain the amount of ink remaining in each of the tanks  9  while also operating the printer  503 . 
     The printer  503  has the print section  41  and the supply tubes  43 , as illustrated in  FIG. 22 , which is a perspective view illustrating the mechanism unit  511 . The print section  41  and the supply tubes  43  have configurations similar to those of the print section  41  and supply tubes  43  in the printer  1 , respectively. In the printer  503 , as well, as with the printer  1 , the medium conveyance mechanism conveys the printing medium P along the Y-axis direction by driving the conveyance roller  51  using power coming from the motor  53  (not shown). In the printer  503 , as well, as in the printer  1 , the head conveyance mechanism conveys the carriage  45  along the X-axis direction by transmitting power coming from the motor  53  to the carriage  45  via the timing belt  55 . The print head  47  is mounted onto the carriage  45 . For this reason, the print head  47  can be conveyed in the X-axis direction via the carriage  45 , by the head conveyance mechanism. The inks are discharged from the print head  47  while the relative position of the print head  47  with respect to the printing medium P is being changed by the medium conveyance mechanism and the head conveyance mechanism, whereby printing is performed on the printing medium P. 
     In each of the embodiments described above, the liquid jet apparatus may be a liquid jet apparatus that consumes a liquid other than an ink by ejecting, discharging, or coating with the liquid. A liquid that trails with particles, tears, or threads is also understood to be included as a state of a liquid that is made into minute liquid droplets and discharged from the liquid jet apparatus. It suffices for the liquid as referred to herein to be such a material that can be consumed with a liquid jet apparatus. For example, it suffices for the liquid to be a substance when the substance is in the liquid phase, and high- or low-viscosity liquids, sols, gel waters, and other inorganic solvents, organic solvents, solutions, liquid resins, liquid metals (molten metals), and other liquid bodies are understood to be included. Not only liquids in the form of one state of a substance, but also solvents into which a functional material composed of a solid matter such as a pigment or metal particles has been dissolved or dispersed, or the like are also understood to be included. Representative examples of liquids could include an ink such as was described in the embodiments above, a liquid crystal, or the like. Herein, the term “ink” encompasses a variety of compositions in the form of a liquid, such as general water-soluble inks and oil-soluble inks as well as gel inks, hot melt inks, and the like. Other specific examples of the liquid jet apparatus may include a liquid jet apparatus for ejecting a liquid containing, in the form of a dispersion or solution, a material such as an electrode material or color material that is used, inter alia, in the manufacture of liquid crystal displays, electroluminescence (EL) displays, surface emitting displays, or color filters. Other examples may include a liquid jet apparatus for ejecting a biological organic matter used to manufacture biochips; a liquid jet apparatus for ejecting a liquid serving as a sample, used as a precision pipette; or printing device, a micro-dispenser, or the like. Further examples include: a liquid jet apparatus for ejecting a lubricant at pin points for a precision machine such as a timepiece or camera; or a liquid jet apparatus for ejecting a transparent resin solution such as an ultraviolet curable resin onto a substrate in order to form, inter alia, a hemispherical micro lens (optical lens) used in an optical communication element or the like. Another example may be a liquid jet apparatus for ejecting an acid or alkali etching solution in order to etch a substrate or the like. 
     A liquid storage container as described above includes a side wall surrounding the liquid injection port and projecting out toward the outside of the liquid storage section, and a cap configured to blocking off the liquid injection port, the liquid storage section including an upper region that is located above the liquid injection port in the posture, the connecting port being provided to the upper region, and a volume of the upper region being greater than a volume of the cap that is fitted to the side wall. 
     In this embodiment, the volume of the upper region is greater than the volume of the cap that is fitted to the side wall, and therefore even when the cap is fitted to the side wall in a state where, for example, the inside of the side wall has been filled with the liquid, the liquid that is pressed against the inside of the liquid storage section with the cap can still be collected in the upper region. This causes the liquid inside the liquid storage section to less readily reach the connecting port even in a configuration having a cap, and therefore makes it possible to reduce the possibility that that liquid inside the liquid storage section could leak out of the liquid storage container via the air introduction section from the air chamber. 
     A liquid storage container according to the embodiment includes a liquid storage section configured to store a liquid, a liquid injection section configured to inject the liquid into the liquid storage section, an air chamber communicated with air, an air introduction section communicated to the air chamber and configured to introduce the air to the air chamber, a communicating passage through which the liquid storage section and the air chamber are communicated to each other, at least a part of the liquid storage section being optically transmissive, the at least a part of the liquid storage section having a mark indicating an upper limit for an amount of the liquid, a liquid injection port defined as an intersection at which the liquid injection section and the liquid storage section intersect each other, and a connecting port defined between the liquid storage section and the communicating passage and located above the mark in a posture where a liquid injection port is oriented upward in a direction intersecting with a horizontal direction. 
     With the liquid storage container of this embodiment, the connecting port between the liquid storage section and the communicating passage is located above the mark indicating the upper limit for the amount of the liquid, and therefore the liquid inside the liquid storage section is less likely to reach the connecting port. For this reason, the possibility that the liquid inside the liquid storage section could flow into the communicating passage is reduced. As a result, the possibility that the liquid inside the liquid storage section could reach the air chamber is reduced, and therefore the possibility that the liquid inside the liquid storage section could leak out of the liquid storage container via the air introduction section from the air chamber can be reduced. 
     A liquid storage container as described above further includes a case member having a groove and a recess communicating with the groove, and a sheet member covering the groove and the recess to seal the groove and the recess, at least a part of the communicating passage being formed of a space surrounded by the groove and the sheet member, and at least a part of the liquid storage section being formed of a space surrounded by the recess and the sheet member. 
     In this embodiment, at least a part of the communicating passage can be configured with the case member and the sheet member, as can at least a part of the liquid storage section. 
     A liquid storage container as described above is characterized in that a rib that is convex toward the sheet member is provided inside the recess. 
     In this embodiment, the rib is provided inside the recess and therefore it is easy to use the rib to regulate deformation of the sheet member when the sheet member is deformed toward inside the recess. 
     A liquid storage container as described above is characterized in that the sheet member is bonded to the rib. 
     In this embodiment, the sheet member is bonded to the rib and therefore deformation of the sheet member to the side opposite to the case member side is easily regulated. 
     A liquid storage container as described above is characterized in that the recess has two inner walls that face one another across the rib, and a gap between the rib and one inner wall of the two inner walls is equal to a gap between the rib and the other inner wall of the two inner walls. 
     In this embodiment, deformation of the sheet member is easily regulated equally between the rib and one inner wall and between the rib and the other inner wall. 
     A liquid storage container as described above is characterized in that the recess has two inner walls that face one another, a plurality of the ribs are provided inside the recess and are lined up along a direction in which the two inner walls face one another, and a gap between one inner wall of the two inner walls and the rib that is adjacent to the one inner wall in the direction, a gap between the other inner wall of the two inner walls and the rib that is adjacent to the other inner wall in the direction, and a gap of two of the ribs that are adjacent in the direction are all equal to one another. 
     In this embodiment, deformation of the sheet member is easily regulated mutually equally between one inner wall and a rib adjacent to this inner wall, between the other inner wall and a rib adjacent to this inner wall, and between two ribs that are adjacent to one another. 
     A liquid storage container as described above is characterized in that the air chamber is located above the liquid storage section and a part of the communicating passage is located above the air chamber in the posture. 
     In this embodiment, the air chamber is located above the liquid storage section and a part of the communicating passage is located above the air chamber, and therefore the liquid that has flowed into the communicating passage from the liquid storage section will less readily rise above the air chamber, due to the action of gravity. For this reason, liquid that has flowed into the communicating passage from the liquid storage section will less readily arrive at the air chamber. As a result, it is easier to prevent liquid that has flowed from the liquid storage section into the communicating passage from leaking out from the liquid storage container. 
     A liquid storage container as described above is characterized in that the communicating passage includes a first portion and a second portion, and the first portion and the second portion are located at opposite sides to one another across the air chamber in the horizontal direction in the posture. 
     In this embodiment, the route of the communicating passage can be lengthened by putting the space surrounding the air chamber to use and forming the communicating passage so as to run around the air chamber. 
     A liquid jet apparatus according to the embodiment includes a first case, a mechanism unit including a mechanism portion covered by the first case and configured to execute a print operation, a second case coupled to the first case, and a plurality of liquid storage containers. The plurality of liquid storage containers are covered by the second case and are arranged to supply a liquid to a print section of the mechanism unit via supply tubes. 
     In the liquid jet apparatus of this embodiment, the plurality of liquid storage containers are arranged inside the same second case, and therefore any variance such as in the height of the connecting port between the liquid storage section and the communicating passage in the plurality of liquid storage containers can be reduced. As a result of this, even in a case where a plurality of liquid storage containers are used, it is possible to endow all of the liquid storage containers with the effect of reducing the possibility that the liquid could leak out of the liquid storage containers via the air introduction sections. 
     A liquid jet apparatus according to the embodiment includes a case, a mechanism unit including a mechanism portion covered by the case and configured to execute a print operation, and a plurality of liquid storage containers. The plurality of liquid storage containers are covered by the case and are arranged to supply a liquid to a print section of the mechanism unit via supply tubes. 
     In the liquid jet apparatus of this embodiment, the plurality of liquid storage containers are arranged inside the same case, and therefore any variance such as in the height of the connecting port between the liquid storage section and the communicating passage in the plurality of liquid storage containers can be reduced. As a result of this, even in a case where a plurality of liquid storage containers are used, it is possible to endow all of the liquid storage containers with the effect of reducing the possibility that the liquid could leak out of the liquid storage containers via the air introduction sections. 
     GENERAL INTERPRETATION OF TERMS 
     In understanding the scope of the present invention, the term “comprising” and its derivatives, as used herein, are intended to be open ended terms that specify the presence of the stated features, elements, components, groups, integers, and/or steps, but do not exclude the presence of other unstated features, elements, components, groups, integers and/or steps. The foregoing also applies to words having similar meanings such as the terms, “including”, “having” and their derivatives. Also, the terms “part,” “section,” “portion,” “member” or “element” when used in the singular can have the dual meaning of a single part or a plurality of parts. Finally, terms of degree such as “substantially”, “about” and “approximately” as used herein mean a reasonable amount of deviation of the modified term such that the end result is not significantly changed. For example, these terms can be construed as including a deviation of at least ±5% of the modified term if this deviation would not negate the meaning of the word it modifies. 
     While only a selected embodiment has been chosen to illustrate the present invention, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made herein without departing from the scope of the invention as defined in the appended claims. Furthermore, the foregoing descriptions of the embodiment according to the present invention are provided for illustration only, and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.