Abstract:
A liquid storage container which is mounted on a printer ejecting a liquid includes a liquid storage chamber that stores the liquid therein, a liquid supply portion that supplies the liquid to the ejecting head, a device chamber that is provided in a pathway supplying the liquid from liquid storage chamber to the liquid supply portion and includes a device in the inner portion thereof, and an air chamber that is provided in a pathway supplying air from the outside to the liquid storage chamber according to a decrease of the liquid in the liquid storage chamber, is filled with air in the inner portion, and prevents the liquid from being leaked to the outside by trapping the liquid when the liquid flows backward from the liquid storage chamber. In addition, among walls which surround the device chamber, at least one wall is adjacent to the air chamber.

Description:
[0001]    Priority is claimed under 35 U.S.C. §119 to Japanese Application No. 2011-013762 filed on Jan. 26, 2011 which is hereby incorporated by reference in its entirety. 
       BACKGROUND 
       [0002]    1. Technical Field 
         [0003]    The present invention relates to a liquid storage container which is applied to a liquid ejecting apparatus ejecting a liquid such as ink and stores the liquid therein. 
         [0004]    2. Related Art 
         [0005]    A printing apparatus which prints an image by ejecting ink onto a printing medium is widely used. In the printing apparatus, the image is printed by ejecting the ink from an ejecting head while reciprocating a carriage on which the ejecting head is provided on the printing medium. Moreover, the ejected ink is stored in an exclusive storage container referred to as an ink cartridge and mounted on the carriage. 
         [0006]    The ink cartridge may include predetermined devices. As an example of the predetermined devices, there is a residual quantity sensor for detecting the residual ink quantity of the ink cartridge. The residual quantity sensor is disposed in a chamber referred to as a sensor chamber in which the periphery is surrounded by walls. The sensor chamber is configured so as to be filled with ink while the ink remains in the ink cartridge. Accordingly, the residual quantity sensor detects whether or not the sensor chamber is filled with the ink, and therefore, the residual quantity sensor detects the residual ink quantity in the ink cartridge. 
         [0007]    In addition, a circuit substrate is provided in the vicinity of a device chamber into which devices such as a sensor are accommodated, and the devices are electrically connected to the circuit substrate. Moreover, the ink cartridge is mounted on the printing apparatus, and therefore, the devices such as the residual quantity sensor are electrically connected to the printing apparatus via the circuit substrate. In addition, a memory for storing various information such as the ink type or the date of manufacture, and the like are also mounted on the circuit substrate. For example, as this kind of ink cartridge, the ink cartridge described in JP-A-2009-285889 is known. 
         [0008]    In the ink cartridge described in JP-A-2009-285889, the sensor chamber is separated from the walls and adjacent to a bubble separation chamber. The sensor chamber and the bubble separation chamber are filled with ink in a state where the ink is stored in the ink cartridge. In this state, for example, if the user drops the ink cartridge by mistake, impact due to the ink in the adjacent bubble separation chambers is transmitted to the sensor chamber via the walls when the ink cartridge collides with a floor. Therefore, there is a concern that damage may be applied to the residual quantity sensor installed in the sensor chamber or the memory provided in the vicinity of the sensor chamber, or the like. In addition, the above-described problem is similarly generated in a cartridge which includes devices other than the sensor. 
       SUMMARY 
       [0009]    An advantage of some aspects of the invention is to provide a technology capable of avoiding damage to a device such as a residual quantity sensor even when impact is applied to a liquid storage container such as dropping of the liquid storage container. 
         [0010]    According to an aspect of the invention, there is provided a liquid storage container which is mounted on a liquid ejecting apparatus ejecting a liquid from an ejecting head and supplies the liquid to the ejecting head including a liquid storage chamber that stores the liquid therein, a liquid supply portion that supplies the liquid to the ejecting head, a device chamber that is provided in a pathway supplying the liquid from the liquid storage chamber to the liquid supply portion and includes a device in the inner portion thereof, and an air chamber that is provided in a pathway supplying air from the outside to the liquid storage chamber according to a decrease of the liquid in the liquid storage chamber, is filled with air in the inner portion, and prevents the liquid from being leaked to the outside by trapping the liquid when the liquid flows backward from the liquid storage chamber, wherein among walls which surround the device chamber, at least one wall is adjacent to the air chamber. 
         [0011]    In this way, in the liquid storage container of the aspect of the invention, among walls which surround the device chamber, at least one wall is adjacent to the air chamber. Thereby, even when the liquid storage container is dropped and impact is applied to the liquid storage container, since the inner portion of the air chamber is filled with air, the impact is not applied to the device chamber from the air chamber. Therefore, compared to the case where the device chamber comes in contact with the chamber which stores liquid, since the impact applied to the device provided in the device chamber is absorbed, damage to the device can be avoided. 
         [0012]    In the liquid storage container of the aspect of the invention, among the walls which surround the device chamber, a wall other than walls which partition the device chamber from the outside may be adjacent to the air chamber. 
         [0013]    In this way, due to the fact that the wall other than walls which partition the device chamber from the outside is adjacent to the air chamber, since the device chamber is not adjacent to the chamber which stores the ink, even when the liquid storage container is dropped and impact is applied to the liquid storage container, impact due to the liquid is not applied to the device chamber from the adjacent chamber. Thereby, since the impact, which is applied to the device provided in the device chamber, is further absorbed, damage to the device can be further avoided. 
         [0014]    In the liquid storage container of the aspect of the invention, the device may be a sensor. In this way, since the device is a sensor, it is also possible to detect a residual quantity of the stored liquid. 
         [0015]    In the liquid storage container of the aspect of the invention, among walls which partition the device chamber from the outside in the walls which surround the device chamber, at least one wall may be adjacent to another device. According to the configuration, even when the liquid storage container is dropped and impact is applied to the liquid storage container, as described above, since the impact is not applied to the device chamber from the air chamber, it is difficult for the impact to be applied to the other device which is separated from the walls and adjacent to the device chamber. Thereby, damage to the other device can be also avoided. 
         [0016]    In the liquid storage container of the aspect of the invention, the other device may be a memory. In this way, due to the fact that the other device is the memory, it is possible to store information such as the kind of the stored liquid and the date of manufacture. 
         [0017]    In the liquid storage container of the aspect of the invention, the center of gravity of the liquid storage container exists in the liquid storage chamber when the liquid storage chamber stores the liquid, and a portion in which the liquid storage chamber exists is larger than a portion in which the air chamber exists in a circumference of the center of gravity. 
         [0018]    When the liquid storage container is dropped, since it is highly possible that the liquid storage container drops in the state where the air chamber side faces upward if considering the center of gravity of the liquid storage container, it is possible to suppress the air chamber from being directly subjected to the impact at the time of the dropping according to the configuration. 
         [0019]    In the liquid storage container of the aspect of the invention, a fixing lever that fixes the liquid storage container to the liquid ejecting apparatus may be provided at a side wall close to the device chamber. 
         [0020]    In the case where the liquid storage container is dropped, since the fixing lever is disposed so as to be close to the device chamber adjacent to the air chamber, the impact applied to the fixing lever can be decreased when the liquid storage container collides with a floor. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0021]    The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements. 
           [0022]      FIG. 1  is an explanatory view exemplifying a state where an ink cartridge is mounted on a carriage of an ink jet printer in a first embodiment of the invention. 
           [0023]      FIGS. 2A and 2B  are perspective views showing an appearance configuration of the ink cartridge which is mounted on the carriage. 
           [0024]      FIG. 3  is a plan view showing an inner structure of the ink cartridge by peeling a sealing film which is stuck to a rear side of a cartridge main body. 
           [0025]      FIG. 4  is a plan view showing the inner structure of the ink cartridge by peeling a display label which is stuck to a front side of the cartridge main body. 
           [0026]      FIGS. 5A to 5D  are structure views showing a simplified inner structure of the ink cartridge. 
           [0027]      FIGS. 6A to 6D  are structure views showing a simplified inner structure of the ink cartridge in a second embodiment of the invention. 
       
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
       [0028]    Hereinafter, in order to explain the contents of the above-described invention, embodiments will be explained according to the following order. 
         [0029]    A. First Embodiment 
         [0030]    B. Second Embodiment 
       A. First Embodiment 
       [0031]      FIG. 1  is an explanatory view exemplifying a state where an ink cartridge  100  is mounted on a carriage  10  of an ink jet printer  1  in a first embodiment of the invention. As shown in  FIG. 1 , the carriage  10  which reciprocates on a printing medium  2  is provided on the ink jet printer  1 , and the ink cartridge  100  is mounted on the carriage  10 . An ejecting head  20  which ejects the ink is provided in a lower surface side (side facing the printing medium  2 ) of the carriage  10  for each ink cartridge  100 , and the ink stored in the ink cartridge  100  is supplied to the ejecting head  20  and ejected from the ejecting head  20  toward the printing medium  2 . Moreover, the illustrated ink jet printer  1  prints an image by using cyan ink (C ink), magenta ink (M ink), yellow ink (Y ink), and black ink (K ink). According to this, four ink cartridges  100  of the ink cartridge  100  which stores the C ink, the ink cartridge  100  which stores the M ink, the ink cartridge  100  which stores the Y ink, and the ink cartridge  100  which stores the K ink are mounted on the carriage  10 . 
         [0032]      FIGS. 2A and 2B  are perspective views showing an appearance configuration of the ink cartridge  100  which is mounted on the carriage  10  in  FIG. 1 . As shown in  FIGS. 2A and 2B , the ink cartridge  100  is mainly configured by a cartridge main body  102  having an approximately rectangular shape. The cartridge main body  102  is formed of a hard resin material. As shown in  FIG. 2A , in the cartridge main body  102 , a display label  160  is stuck so as to be bent from the front side surface to the upper surface. 
         [0033]    In addition, as shown in  FIG. 2B , a sealing film  170  is stuck to the rear side surface of the cartridge main body  102 . As described below, the rear side surface of the cartridge main body  102  is opened, and the ink can be stored in the ink cartridge  100  for the first time by sticking the sealing film  170  on the opening and sealing the ink. Moreover, an ink supply portion  104  for supplying the ink toward the ejecting head  20  of the carriage  10  is provided on the bottom surface of the cartridge main body  102 . 
         [0034]    In addition, as shown in  FIGS. 2A and 2B , a fixing lever  106  for fixing the ink cartridge  100  to the carriage  10  when mounting the ink cartridge  100  on the carriage  10  is provided in one side surface of the sides of the cartridge main body  102 . 
         [0035]      FIG. 3  is a plan view showing the inner structure of the ink cartridge  100  in  FIGS. 2A and 2B  by peeling the sealing film  170  which is stuck to the rear side surface of the cartridge main body  102 . As shown in  FIG. 3 , if the sealing film  170  which is stuck to the rear side of the cartridge main body  102  is peeled, a largely opened concave portion  110  appears. In addition, the concave portion  110  is mainly divided into five regions by a plurality of walls  120  which are vertically and horizontally provided. Moreover, five chambers are formed between the concave portion  110  and the sealing film  170  by sticking the sealing film  170  onto the rear side of the cartridge main body  102  and sealing the concave portion  110 . 
         [0036]    Among the five chambers, as shown by an oblique line in  FIG. 3 , a first ink storage chamber  116   a  is provided at the right side of  FIG. 3 , and a second ink storage chamber  116   b  is provided at the upper left of  FIG. 3 . A sensor chamber  118  shown by a fine oblique line is provided at the lower left in  FIG. 3  with respect to the second ink storage chamber  116   b . A residual quantity sensor (not shown) is provided in the sensor chamber  118 . In addition, a buffer chamber  119  is obliquely provided to the upper right of the sensor chamber  118 . Moreover, the buffer chamber  119  communicates with a pressure regulation chamber  107  by a small round communicating hole  152 . A membrane valve, a spring (all not shown), and the like are housed in the pressure regulation chamber  107 , and the pressure regulation chamber includes a function which regulates pressure of the ink supplied to the carriage  10 . 
         [0037]    Moreover, the first ink storage chamber  116   a  and the second ink storage chamber  116   b  are connected to each other by an ink passage  150 , and the sensor chamber  118  and the buffer chamber  119  are connected to each other by an ink passage  146 . Accordingly, when the ink is ejected from the ejecting head  20 , after the ink flows from the communicating hole  152  into the pressure regulation chamber  107  via the second ink storage chamber  119 , the sensor chamber  118 , and the buffer chamber  116   b  from the first ink storage chamber  116   a , the ink is supplied from the ink supply portion  104  to the ejecting head  20 . 
         [0038]    In addition, as shown in  FIG. 3 , an air chamber  114  is also provided at the lower left in  FIG. 3  with respect to the first ink storage chamber  116   a . A communicating hole  130  is provided at the air chamber  114 , and as described hereinafter, the communicating hole is connected to a hole open to the atmosphere via an air passage which is provided at the front side of the cartridge main body  102 . In addition, the air chamber  114  is connected to the above-described first ink storage chamber  116   a  by an air passage  134 . When the ink flows backward from the first ink storage chamber  116   a  due to an ambient temperature change, a posture change of the ink cartridge  100 , or the like, the air chamber  114  traps the ink in the inner portion and prevents the ink from moving further upward and being leaked from the ink cartridge  100 . 
         [0039]      FIG. 4  is a plan view showing the inner structure of the ink cartridge  100  in  FIGS. 2A and 2B  by peeling the display label  160  which is stuck to the front side of the cartridge main body  102 . As shown in  FIG. 4 , a plurality of grooves appear if the display label  160  attached to the front side of the cartridge main body  102  is peeled. In  FIG. 4 , the grooves are indicated by oblique lines. Passages are formed between each groove and the display label  160  by sticking the display label  160  onto the front side of the cartridge main body  102  and sealing the grooves. 
         [0040]    The passages include a communicating hole  154  which communicates with a hole open to the atmosphere  124  opened to the bottom surface of the cartridge main body  102 , as the starting end; an upstream side elongated air passage  128  which meanders while changing direction several times; a downstream side elongated air passage  156  which has the communicating hole  130  described by  FIG. 3  as the termination; and an approximately rectangular air reservoir  112  which is provided between the upstream side air passage  156  and the downstream side air passage  128  and formed in a shallow concave shape, or the like. Moreover, the surface configuration of the pressure regulation chamber  107  is shown in the vicinity (right side in  FIG. 4 ) of the communicating hole  130 . 
         [0041]    Here, for the easy understanding of the inner structure of the ink cartridge  100  in the embodiment, the explanation is performed based on the configuration which simplifies the entire structure and changes a portion of the structure. 
         [0042]      FIGS. 5A to 5D  are structure views showing a simplified inner structure of the ink cartridge  100  shown in  FIGS. 3 and 4 . In  FIGS. 5A to 5D ,  FIG. 5A  is a top view of the cartridge main body  102  when viewed from the upper side,  FIG. 5B  is a rear view of the cartridge main body  102  when viewed from the rear side,  FIG. 5C  is a side view of the cartridge main body  102  when viewed from the side, and  FIG. 5D  is a front view of the cartridge main body  102  when viewed from the front side. 
         [0043]    In  FIGS. 5A to 5D , as shown in  FIG. 5A , the hole open to the atmosphere  124  is provided on not the bottom surface of the cartridge main body  102  but the upper surface thereof. Moreover, as shown in  FIG. 5B , the air reservoir  112  is provided at the upper left corner in the rear side of the cartridge main body  102 . The air chamber  114  is provided at the lower portion of the cartridge main body  102  and occupies a large portion of the lower portion. On the other hand, the ink storage chamber  116  is configured of a single chamber, provided on the upper portion of the cartridge main body  102 , and occupies a large portion of the upper portion. 
         [0044]    The sensor chamber  118  is provided at the lower left side of the cartridge main body  102 . Accordingly, among walls which surround the sensor chamber  118 , a wall  120   a  is adjacent to the air chamber  114 , and a wall  120   b  is adjacent to the ink storage chamber  116 . The other walls are the walls which partition the sensor chamber from the outside. Among the walls which partition the sensor chamber  118  from the outside, a wall  120   c  is adjacent to a circuit substrate  122  which is provided in the outer portion of the cartridge main body  102 . A residual quantity sensor (not shown) in the sensor chamber  118  is electrically connected to the circuit substrate  122  via the wall  120   c . Memory (not shown) for storing various information such as the ink type or the date of manufacture, and the like are mounted on the circuit substrate  122 . The circuit substrate  122  is electrically connected to the ink jet printer  1  in a state where the ink cartridge  100  is mounted on the carriage  10 . 
         [0045]    Moreover, the fixing lever  106  is provided at the side surface near to the sensor chamber  118  among the surfaces of the sides of the carriage main body  102 . 
         [0046]    The air reservoir  112  communicates with the hole open to the atmosphere  124 . A communicating hole  126  is provided in the air reservoir  112 , and as shown in  FIG. 5D , the air reservoir communicates with the front side of the carriage main body  102 . 
         [0047]    In the rear side of the cartridge main body  102 , the communicating hole  126  is connected to the communicating hole  130  via the air passage  128 . As described above, the communicating hole  130  communicates with the air chamber  114  in the rear side of the cartridge main body  102 . Moreover, a communicating hole  132  is provided in the air chamber  114  and communicates with the front side of the cartridge main body  102 . In the front side, the communicating hole  132  is connected to a communicating hole  136  via the air passage  134 . The communicating hole  136  communicates with the ink storage chamber  116  which is positioned at the rear side of the cartridge main body  102 . 
         [0048]    In addition, a communicating hole  138  is provided in the ink storage chamber  116  and communicates with the front side of the cartridge main body  102 . In the front side, the communicating hole  138  is connected to a communicating hole  142  via an ink passage  140 . The communicating hole  142  communicates with the sensor chamber  118  in the rear side of the cartridge main body  102 . A communicating hole  144  is provided in the sensor chamber  118  in addition to the communicating hole  142  and communicates with the front side of the cartridge main body  102 . In the front side, the communicating hole  144  is connected to the communicating hole  148  via an ink passage  146 . The communicating hole  142  communicates with the ink supply portion  104 . Moreover, in  FIGS. 5A to 5D , for simplicity, a buffer chamber  119 , the pressure regulation chamber  107 , and the like are omitted. 
         [0049]    Accordingly, in  FIGS. 5A to 5D , when ink is ejected from the ejecting head  20 , the ink is supplied from the ink storage chamber  116  to the ejecting head  20  via the communicating hole  138 , the ink passage  140 , the communicating hole  142 , the sensor chamber  118 , the communicating hole  144 , and the ink supply portion  104 . 
         [0050]    In addition, the ink storage chamber  116  is connected to the air chamber  114  via the air passage  134 , and the air chamber  114  is opened to the atmosphere via the communicating hole  130 , the air passage  128 , the communicating hole  126 , the air reservoir  112 , and the hole open to the atmosphere  124 . As described above, even in the case where the ink flows backward from the ink storage chamber  116  according to the temperature change, the posture change, or the like, the air chamber  114  traps the ink in the inner portion. Therefore, the ink is prevented from moving further to the upstream side and being leaked from the ink cartridge  100 . 
         [0051]    On the other hand, the sensor chamber  118 , which is positioned further downstream from the ink storage chamber  116 , is filled with ink in a state where the ink exists in the ink storage chamber  116 . Accordingly, the residual quantity sensor (not shown), which is installed in the sensor chamber  118 , detects the residual ink quantity in the ink cartridge  100  according to detecting whether or not the sensor chamber  118  is filled with ink. The detected result is transmitted to the ink jet printer  1  via the circuit substrate  122 . 
         [0052]    In the embodiment, as shown in  FIG. 5B , among the walls which surround the sensor chamber  118  in which the residual quantity sensor (not shown) is positioned, the right wall  120   a  is adjacent to the air chamber  114  as described above while the upper wall  120   b  is adjacent to the ink storage chamber  116 . That is, the chamber which stores the ink is adjacent to the upside of the sensor chamber  118 , but the chamber which is filled with air is adjacent to the right side of the sensor chamber  118 . 
         [0053]    Thereby, even in the case where the user accidentally drops the ink cartridge  100  containing ink, according to the following cause, damage to the residual quantity sensor (not shown) installed in the sensor chamber  118  or the memory (not shown) provided to be adjacent to the sensor chamber  118  can be avoided. 
         [0054]    That is, when the ink cartridge  100  collides with a floor, the impact due to the stored ink is transmitted to the sensor chamber  118  via the wall  120   b  from the ink storage chamber  116 . However, since the inner portion of the air chamber  114  is air, the impact from the air chamber  114  is not applied to the sensor chamber. Therefore, the impact which is applied to the residual quantity sensor, the memory, and the like is absorbed to that extent. As a result, damage to the devices can be avoided. 
         [0055]    Moreover, in the embodiment, when considering the center of gravity of the ink cartridge  100 , the center of gravity does not exist at the air chamber  114  side which is filled with air, but exists at the ink storage chamber  116  side which stores the ink. In addition, with respect to the circumference of the center of gravity, the volume of the portion in which the ink storage chamber  116  exists is larger than the volume of the portion in which the air chamber  114  exists. Thereby, when the user drops the ink cartridge  100  by mistake, it is highly possible that the ink cartridge  100  drops in the state where the air chamber  114  side faces upward. 
         [0056]    On the other hand, the fixing lever  106  is provided at the side wall which is close to the sensor chamber  118  adjacent to the air chamber  114 . Accordingly, when the ink cartridge  100  collides with a floor, the impact of the collision which is applied to the fixing lever  106  can be decreased. 
       B. Second Embodiment 
       [0057]      FIGS. 6A to 6D  are structure views showing a simplified inner structure of the ink cartridge in a second embodiment of the invention. In  FIGS. 6A to 6D ,  FIG. 6A  is a top view of a cartridge main body  202  when viewed from the upper side,  FIG. 6B  is a rear view of the cartridge main body  202  when viewed from the rear side,  FIG. 6C  is a side view of the cartridge main body  202  when viewed from the side, and  FIG. 6D  is a front view of the cartridge main body  202  when viewed from the front side. 
         [0058]    The differences between the present embodiment and the above-described first embodiment are the following. That is, in the first embodiment, among walls which surround the sensor chamber  118 , the upper wall  120   b  is adjacent to the ink storage chamber  116  while the right wall  120   a  is adjacent to the air chamber  114 . In contrast, in the second embodiment, among walls which surround a sensor chamber  218 , a right wall  220   a  and an upper wall  220   b  are all configured so as to be adjacent to an air chamber  214 . In other words, all walls other than the walls which partition the sensor chamber from the outside are configured so as to be adjacent to the air chamber  214 . 
         [0059]    That is, in the second embodiment, an air reservoir  212  is provided so as to be near to the left side of the upper portion of the cartridge main body  202 . The air chamber  214  is provided at the left side of the cartridge main body  202  and occupies a large portion of the left side portion. An ink storage chamber  216  is provided at the right side of the cartridge main body  202  and occupies a great portion of the right side portion. The sensor chamber  218  is provided at the left side of the lower portion of the cartridge main body  202 , and as described above, is positioned so as to be adjacent to the air chamber  214  via the walls  220   a  and  220   b . Accordingly, in the second embodiment, the upper portion and the right portion of the sensor chamber  218  is adjacent to the chamber which is filled with air, but is not adjacent to the chamber which stores the ink at all. 
         [0060]    Thereby, even when the user drops accidentally the ink cartridge containing ink, according to the following cause, damage to the residual quantity sensor (not shown) installed in the sensor chamber  218  or the memory (not shown) provided to be adjacent to the sensor chamber  218  can be avoided. That is, when the ink cartridge collides with a floor, since the impact due to the ink is not transmitted to the sensor chamber  218  from the adjacent chambers, the impact which is applied to the residual quantity sensor, the memory, and the like is greatly absorbed, and damage to the devices can be avoided. 
         [0061]    Moreover, in the second embodiment, since the other configurations and operations are similar to those of the first embodiment, the descriptions are omitted. 
         [0062]    As described above, various embodiments are described. However, the invention is not limited to all the above-described embodiments and can be performed as various aspects within the scope which does not depart the gist.