JP4066941B2 - Liquid cartridge - Google Patents

Description

  The present invention relates to a liquid cartridge. In particular, the present invention relates to a liquid cartridge that supplies liquid to a liquid ejecting apparatus.

As an example of a liquid ejecting apparatus, an ink jet recording apparatus prints on a recording material by ejecting ink from nozzles provided in a recording head. An ink cartridge, which is an example of a liquid cartridge, holds ink in an ink container and is attached to the ink jet recording apparatus to supply ink to the ink jet recording apparatus (see, for example, Patent Document 1).
JP 2001-277530 A (pages 2 to 3, FIG. 1)

  Prior to the first use of the ink cartridge, the ink cartridge is packaged in a vacuum sealed package. When this reduced pressure sealed package is opened and the ink cartridge is mounted on the ink jet recording apparatus, since negative pressure is applied to the ink container, ink is drawn from the recording head into the ink cartridge, and air is further drawn into the recording head. May be. For this reason, the ink meniscus formed on the recording head may be destroyed, and the recording head may become unusable.

  Therefore, an object of the present invention is to provide a liquid cartridge that can solve the above-described problems. This object is achieved by a combination of features described in the independent claims. The dependent claims define further advantageous specific examples of the present invention.

In order to solve the above problems, according to a first aspect of the present invention, there is provided a liquid cartridge for supplying a liquid to a liquid ejecting apparatus , wherein a liquid storage portion for storing a liquid, Supply unit for supplying to the liquid ejecting device, communication unit for connecting the liquid storage unit and the atmosphere, an atmospheric valve for opening and closing, and the air valve facing the communication unit from the liquid storage unit side to seal the communication unit and a biasing unit for biasing the air side, the biasing unit, the liquid cartridge inside is sealed in a package at a pressure lower than the atmospheric pressure of the liquid storage portion is opened to atmospheric pressure by opening the package In this case, the atmospheric valve opens the communication part due to the difference between the pressure inside the liquid storage part and the atmospheric pressure, and the atmospheric valve seals the communication part when the difference between the pressure inside the liquid storage part and the atmospheric pressure becomes weaker. Has a biasing force to As a result, when the pressure in the liquid storage part of the liquid cartridge is lower than the atmospheric pressure, the atmospheric valve once opens the communication hole to communicate with the atmosphere, so that the difference between the pressure in the liquid storage part and the atmospheric pressure is reduced. Can do. Therefore, when the liquid cartridge is mounted on the liquid ejecting apparatus, the liquid cartridge can be prevented from drawing liquid from the liquid ejecting apparatus. Further, when the liquid cartridge is opened to the atmospheric pressure, the atmosphere valve can open the communication portion and communicate with the atmosphere with a simple configuration.

In the liquid cartridge, the urging unit may include a coil spring. Thereby, based on the urging | biasing force of the coil spring used as an urging | biasing part, the grade which weakens the difference between the pressure in a liquid accommodating part and atmospheric pressure can be adjusted .

The liquid cartridge may further include a seal that seals the supply unit and is opened when the liquid cartridge is used for the first time. As a result, when the decompression-sealed package is opened and the liquid cartridge is opened to the atmospheric pressure, the supply unit side is prevented from being released into the atmosphere, and the communication unit is opened to communicate with the atmosphere by reliably moving the atmospheric valve. be able to.
The liquid cartridge further includes a shaft portion that is an operating rod of the atmospheric valve, and a film that comes into contact with the shaft portion, and the urging portion is a pressure between the pressure inside the liquid storage portion and the atmospheric pressure when the liquid cartridge is opened. The atmospheric valve may be biased with a force that is weaker than the force obtained by multiplying the differential pressure by the area of the region where the film bends in contact with atmospheric pressure. Thereby, when the liquid cartridge is opened to the atmospheric pressure, the atmospheric valve can open the communicating portion to communicate with the atmosphere, and from this state, the pressure in the liquid containing portion is further increased, When the difference between the pressure at the portion and the atmospheric pressure is weakened, the atmospheric valve can again seal the communicating portion.

  The above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

  Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the invention according to the scope of claims, and all combinations of features described in the embodiments are included. It is not necessarily essential for the solution of the invention.

  FIG. 1 shows an example of a liquid cartridge suitable for supplying a liquid to a liquid ejecting head of a liquid ejecting apparatus, using an ink cartridge 100 for an ink jet recording apparatus as seen from an obliquely upper side. It is a front perspective view.

  The liquid ejecting apparatus referred to in the present invention is not only a liquid ejecting head of an ink jet recording apparatus, but also a colorant ejecting head of a color filter manufacturing apparatus for manufacturing a color filter of a liquid crystal display, an organic EL display, an FED (surface And an electrode material (conductive paste) ejecting head for forming electrodes such as a light emitting display), a bio-organic matter ejecting head of a biochip manufacturing apparatus for manufacturing a biochip, and a sample ejecting head as a precision pipette.

  2 and 3 are rear perspective views of the ink cartridge 100 of FIG. 1 as viewed obliquely from below, and FIG. 2 is a diagram illustrating a state before the film 110 is attached to the surface of the ink cartridge 100. FIG. 4 is a diagram illustrating a state where a film 110 is attached to the ink cartridge 100. 4 and 5 are exploded perspective views showing the members constituting the ink cartridge 100 in an exploded manner. 6 and 7 are front views of the ink cartridge 100 of FIG. 1, FIG. 6 is a diagram showing a state before the film 130 is attached to the opening 122 of the ink cartridge 100, and FIG. 2 is a diagram illustrating a state in which a film is attached to an opening portion of the ink cartridge. FIG. In FIG. 7, the film 130 is attached to the area indicated by hatching.

  As shown in FIG. 4, the ink cartridge 100 has a bottomed, substantially housing-shaped cartridge main body 120 having an opening 122, a film 130 covering almost the entire surface of the opening 122, and an outer side of the film 130. A lid 140 is provided. The interior of the cartridge body 120 is partitioned by ribs and walls as will be described later. The film 130 seals almost the entire surface of the opening 122 of the cartridge main body 120 so that the inside thereof is in a sealed state. The lid 140 is further fixed to the cartridge body 120 so as to cover the outside of the film 130 in an unsealed state.

  The cartridge main body 120 includes an ink storage unit 111 that stores ink, an ink flow path unit from the ink storage unit 111 to the ink supply unit 160, an ink side passage that allows the ink storage unit 111 to communicate with the atmosphere, an atmospheric valve storage unit, For example, and is integrally molded with propylene (PP).

  The ink cartridge 100 further includes an ink supply control unit 150, an ink supply unit 160, a storage unit 170, and an engagement lever 180. The ink supply unit 160 is disposed on the lower surface of the cartridge main body 120, and an ink supply needle formed on the carriage 42 on which the ink cartridge 100 is mounted is inserted, and the ink stored in the ink storage unit 111 is transferred to the ink jet recording apparatus. To the recording head. The storage unit 170 is caulked to the mounting portion 190, and the mounting portion 190 is caulked below the side surface of the cartridge main body 120. The storage unit 170 stores information on the type of the ink cartridge 100, information on the color of the ink held by the ink cartridge 100, information on the existing amount of ink, and the like. Pass this information between. The engagement lever 180 is formed on the upper portion of the side surface of the cartridge main body 120 facing the mounting portion 190 and engages with the carriage 42 of the ink jet recording apparatus. The side surface of the mounting portion 190 is regulated by a rib (not shown) formed on the carriage so that the terminal 171 and the elastic contact on the carriage side are in contact with each other.

  The ink supply control unit 150 includes a differential pressure valve that supplies ink in the ink storage unit 111 to the ink supply unit 160 due to a pressure difference between the ink storage unit 111 and the ink supply unit 160 that is generated as ink is consumed. Yes. The ink supply control means 150 is elastically deformable and is a membrane valve 900 which is an example of a valve member inserted into the recess 495 of the cartridge body 120, a valve lid 151 covering the recess 495, the membrane valve 900 and the valve lid. 151 and a coil spring 907 as an example of an urging member disposed between the two.

As shown in FIGS. 6 and 7, the ink containing portion 111 is largely divided into an upper portion and a lower portion by a wall 272 extending in the horizontal direction, and an air-side containing portion 270 capable of communicating with the atmosphere through a communication hole 242 is provided at the lower portion. In addition, a supply-side storage unit 290 including two first ink storage units 292 and a second ink storage unit 294 that are shielded from the atmosphere is formed in the upper part. The supply-side container 290 is divided into two parts, a first ink container 292 and a second ink container 294, by an oblique wall 271 having a communication part 276 in the vicinity (lower region) of the wall 272, and the second ink. A flow path portion 296 is formed so as to be surrounded by the accommodating portion 294. The flow path portion 296 is connected to the second ink storage portion 294 via the lower communication portion 278 and is connected to the ink supply control means 150 via the passages 298 and 300 and the through hole 918.
The downstream side of the ink supply control means 150 is formed at one end of a communication hole 910 communicating with the ink supply control means 150, a communication portion 302 communicating with the communication hole 910, a flow path 321, and a flow path 321. It is configured to communicate with the ink supply unit 160 through a through hole 323 formed toward the end and a communication unit 304 having one end communicating with the through hole 323.

  The atmosphere-side container 270 and the first ink container 292 are communicated with each other by a communication path 295 extending vertically, and the ink in the atmosphere-side container 270 is supplied to the first ink corresponding to the consumption of ink from the ink supply unit 160. The ink is sucked into the storage portion 292 and then flows into the ink supply control means 150 through the second ink storage portion 294, the flow path portion 296, and the like. From the atmosphere side container 270 of the ink container 111 to the ink supply control means 150, the communication part 274, the second ink injection port 162, the communication path 295, the communication parts 276 and 278, the flow path part 296, and the paths 298 and 300. The ink flows through the through holes 918 in this order.

  On the other hand, the atmospheric valve portion 250 has a hollow atmospheric valve storage chamber 232 in which the atmospheric valve 254 is accommodated. The wall surface below the atmospheric valve storage chamber 232 has a diameter slightly larger than the diameter of the shaft portion 264 of the atmospheric valve 254. And a communication hole 239 that also serves as a communication path for the atmosphere, and the shaft portion 264 of the atmosphere valve 254 is constantly urged toward the bottom surface of the ink cartridge 100 by the coil spring 255 and is slidably inserted. When the ink cartridge 100 is not mounted on the carriage 42 of the ink jet recording apparatus, the communication hole 239 is sealed by the atmospheric valve 254. As a result, the atmospheric valve 254 is arranged so as to be movable in the vertical direction when the ink cartridge 100 is mounted on the carriage 42. It is pushed up by the member 60 to open the communication hole 239. The spring force of the coil spring 255 will be described later.

  FIG. 8 is a rear view showing a state before the film 110 is attached to the ink cartridge 100 of FIG. The atmosphere side passage which is the side communicating with the atmosphere with the communication hole 239 as a boundary is formed on the bottom surface of the opening 212, the meandering passage 214, the filter housing portion 216, the communication hole 218 and the communication portion 222, and the communication portion 222. A communication hole 253 and a communication part 224 are included.

  Specifically, as shown in FIG. 8, one end of a single passage 214 meandering in a maze formed on the front side of the cartridge body 120 is opened to the atmosphere as an opening 212, and the other end is ink-repellent and breathable. The filter 215 (FIGS. 4 and 5) having the above function is connected to the filter housing portion 216 in which the filter 215 is housed. The filter housing portion 216 communicates with a communication hole 218 that penetrates from the front side to the back side of the cartridge main body 120. The communication hole 218 is connected to the communication part 224 via a communication part 222 on the back side of the cartridge main body 120 and a communication hole 253 formed in the bottom of the room that defines the communication part 222. In the middle of the passage 214, a chamber 930 made of a recess is provided.

  As shown in FIG. 2, the communication portion 224 is formed as a concave portion 257 on the bottom surface of the cartridge body 120, exposes the shaft portion 264 that is an operating rod of the atmospheric valve 254, and stores the atmospheric valve 254. A communication hole 239 capable of communicating with the H.232 and a communication hole 253 communicating with the communication portion 222 are formed in the recess 257, and the outer surface of the recess 257 is connected to the first ink injection port 161 and the second ink injection port 162. It is formed by sealing with a film 132 to be sealed. The film 132 is selected so that it can be elastically deformed by the pressing force of the operating member provided on the carriage 42.

  On the other hand, as shown in FIG. 6, the ink side passage that communicates with the atmosphere side accommodation portion 270 with the communication hole 239 described above as a boundary is the atmosphere valve storage chamber 232, the communication hole 234a, the communication chamber 234b, the communication portion 234c, and the communication chamber 234d. The communication portion 236, the communication chamber 237 and the communication hole 238, the communication groove 240, and the communication hole 242 are formed. More specifically, a through hole 232a is formed in the upper wall of the atmosphere valve storage chamber 232, and the communication chamber 234b and the communication formed by the notch in the upper wall of the communication chamber 234b are formed through the through hole 232a. The communication portion 234c, the communication chamber 234d provided in the upper portion of the communication portion 234c, the communication portion 236 formed by the cutout of the upper wall of the communication chamber 234d, and the communication chamber 237 in which the communication hole 238 is formed in the lower portion are sequentially communicated. An air passage is formed. The communication hole 238 penetrating from the back side to the front side of the cartridge main body 120 is connected to the communication groove 240 communicating with the communication hole 238, and communicates with the communication groove 240 and through the communication hole 242 penetrating from the front side to the back side of the cartridge main body 120. It communicates with the housing part 270. The atmosphere side accommodating portion 270, the supply side accommodating portion 290, the atmosphere valve portion 250, the atmosphere side passage, and the ink side passage are adhered to the walls partitioning the films 130 and 110 by a method such as heat welding. By this, it becomes a region isolated from the atmosphere.

  The ink supply unit 160 includes a seal member 12 formed of an elastomer having an insertion port 26 into which an ink supply needle provided in the carriage 42 is inserted, a supply valve 13 that closes the insertion port 26 of the seal member 12, and a supply And a biasing member 14 made of a coil spring or the like that biases the valve 13 toward the seal member 12. A seal 604 is attached to the insertion port 26 of the seal member 12 at the time of factory shipment.

  When the ink cartridge 100 is mounted on the carriage 42 of the ink jet recording apparatus, the convex portion provided on the carriage 42 pushes up the shaft portion 264 of the atmospheric valve 254 through the film 132 and the ink supply needle of the carriage 42. Pushes the supply valve 13 of the ink supply unit 160 upward. As a result, the communication hole 239 communicates the atmosphere flow path from the atmosphere valve storage chamber 232 to the communication hole 242 with the atmosphere. Further, upstream of the supply valve 13 in the ink supply unit 160 communicates with the ink supply needle.

  When the ink jet recording apparatus starts recording in a state where the communication hole 242 communicates with the atmosphere, ink is supplied from the ink supply unit 160 to the recording head through the ink supply needle. When ink is supplied from the ink supply unit 160, the ink that has flowed in the order of the arrow a and the through hole 918 shown in FIG. 6 in the ink storage unit 111 passes through the ink supply control means 150 and the arrow b shown in FIG. 6. , C, d in this order, flow into the ink supply unit 160, and ink is supplied to the ink supply needle inserted into the ink supply unit 160.

  In the ink storage unit 111, the ink in the atmosphere-side storage unit 270 is supplied to the supply-side storage unit 290 in accordance with the ink flow. As the ink in the atmosphere-side accommodation unit 270 is consumed, air flows in order from the communication hole 242 to the atmosphere-side accommodation unit 270 through the path indicated by the arrow f, the bottom-side communication unit 224, and the arrow g in FIG. Ink is supplied from the ink supply unit 160 to the recording head to lower the liquid level of the atmosphere-side accommodation unit 270, but the flow path connecting the atmosphere-side accommodation unit 270 and the supply-side accommodation unit 290 is provided in the atmosphere-side accommodation unit 270. Since there is a communication port at the lowermost part, air does not flow into the supply-side storage unit 290 until all the ink in the atmosphere-side storage unit 270 moves to the supply-side storage unit 290.

  After all the ink in the atmosphere-side container 270 is consumed, the ink in the first ink container 292 and the second ink container 294 in the supply-side container 290 is consumed in this order. During this time, the ink in the supply side container 290 is transferred to the atmosphere side container 270 due to the surface tension of the ink meniscus formed in the second ink inlet 162 that communicates the supply side container 290 and the atmosphere side container 270. Backflow is prevented.

  When the ink in the first ink storage unit 292 starts to be consumed, air flows into the first ink storage unit 292. As a result, the liquid level of the first ink storage portion 292 is lowered. However, since only the lower portion of the first ink storage portion 292 and the second ink storage portion 294 are connected by the communication portion 276, first, the first ink storage portion 292 and the second ink storage portion 294 are connected. The ink in the container 292 is consumed. When the ink in the first ink storage portion 292 is consumed and the liquid level reaches the communication portion 276, the air also enters the second ink storage portion 294 as the ink in the second ink storage portion 294 is consumed. Inflow. While the ink in the second ink storage portion is consumed, surface tension due to the ink meniscus is generated in the communication portion 276, so that the ink in the second ink storage portion 294 is prevented from flowing back to the first ink storage portion 292. .

  As described above, the ink in the atmosphere-side storage unit 270, the first ink storage unit 292, and the second ink storage unit 294 is consumed in this order. The ink storage unit 111 is supplied to the ink supply unit 160 through the passage 918 from the communication unit 278 disposed in the vicinity of the wall 272 that substantially bisects the ink storage unit 111.

  The coil spring 255 shown in FIG. 6 is an example of an urging portion in the present invention. The coil spring 255 urges the atmosphere valve 254 from the ink containing portion 111 side to the atmosphere side with respect to the communication hole 239. Thus, in a state where the ink cartridge 100 is not mounted on the ink jet recording apparatus, the atmospheric valve 254 seals the communication hole 239 to block communication between the ink containing portion 111 and the atmosphere. Here, the coil spring 255 has a biasing force to open the communication hole 239 by the atmospheric valve 254 moving against the coil spring 255 due to the atmospheric pressure when the ink cartridge 100 is opened to the atmospheric pressure. For example, the coil spring 255 causes the film 132 that contacts the shaft portion 264 of the atmospheric valve 254 to be bent in contact with the atmospheric pressure due to the differential pressure between the pressure in the ink containing portion 111 and the atmospheric pressure when the ink cartridge 100 is opened. The atmospheric valve 254 is urged with a force that is weaker than the force obtained by multiplying the area of the region capable of generating In the present embodiment, the region where the film 132 can be bent in contact with the atmospheric pressure is substantially the same as the region of the communication portion 224.

  After ink is stored in the ink storage portion 111 of the ink cartridge 100 having the above-described configuration, the ink cartridge 100 is sealed under reduced pressure by a vacuum sealed package such as aluminum under reduced pressure. As a result, the inside of the ink containing portion 111 of the ink cartridge 100 is also depressurized and becomes a state lower than the atmospheric pressure. From this state, when the vacuum sealed package is opened, the ink cartridge 100 is opened to atmospheric pressure. In this case, since the atmospheric pressure is larger than the pressure in the ink containing portion 111, the atmospheric valve 254 receives pressure from the atmospheric pressure side to the ink containing portion 111 side. Here, since the coil spring 255 that urges the atmospheric valve 254 from the ink container 111 side to the communication hole 239 has the above-described urging force, the atmospheric valve 254 communicates against the urging force of the coil spring 255 by atmospheric pressure. Move upward to open part 224. Therefore, the ink storage unit 111 communicates with the atmosphere through the communication hole 239, and the pressure of the ink storage unit 111 increases. Thereby, the atmospheric valve 254 can weaken the difference between the pressure in the ink storage unit 111 and the atmospheric pressure.

  If the difference between the pressure of the ink containing portion 111 and the atmospheric pressure is further reduced due to the increase in the pressure of the ink containing portion 111 from the above state, the biasing force of the coil spring 255 is superior to the pressure exerted on the atmospheric valve 254 by the atmospheric pressure. The atmospheric valve 254 again seals the communication hole 239. Thereby, in a state where the ink cartridge 100 is not attached to the ink jet recording apparatus, the communication hole 239 is kept sealed, and ink can be prevented from leaking from the ink cartridge 100.

  As described above, according to the ink cartridge 100 of the present embodiment, the atmospheric valve 254 resists the urging force of the urging unit 600 due to the atmospheric pressure when the decompression sealed package containing the ink cartridge 100 is opened. Since the ink cartridge 100 is once moved upward to open the communication portion 224, the ink cartridge 100 can be opened to the atmosphere, and the difference between the pressure in the ink cartridge 100 and the atmospheric pressure can be reduced. Accordingly, when the ink cartridge 100 is mounted on the ink jet recording apparatus, the ink cartridge 100 is prevented from drawing ink from the recording head of the ink jet recording apparatus, and the air is drawn into the recording head so that the recording head is It is possible to prevent failure.

  Further, as shown in FIG. 5, since the coil spring 255 is used as the urging portion, the pressure in the ink containing portion 111 in each ink cartridge 100 and the atmospheric pressure can be selected by appropriately selecting the urging force of the coil spring 255. The degree to which the difference is weakened can be adjusted. For example, when the coil spring 255 having a weaker urging force is used, the difference between the pressure in the ink containing portion 111 and the atmospheric pressure can be further reduced when the decompression sealed package is opened.

  Further, as described with reference to FIGS. 2 and 3, since the ink supply unit 160 is sealed by the seal 604, the ink supply unit 160 does not communicate with the atmosphere, and the ink supply unit 160 side evacuates the ink storage unit 111 to the atmosphere. Can be prevented. Therefore, when the decompression sealed package is opened and the ink cartridge 100 is opened to the atmosphere, the atmospheric valve 254 can be reliably moved, and the negative pressure of the ink containing portion 111 can be reliably reduced.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

FIG. 3 is a front perspective view of the ink cartridge 100 according to the first embodiment. FIG. 3 is a rear perspective view of the ink cartridge 100 before a film 110 is attached. FIG. 3 is a rear perspective view of the ink cartridge 100 after a film 110 is attached. 2 is an exploded perspective view of the ink cartridge 100. FIG. 2 is an exploded perspective view of the ink cartridge 100. FIG. FIG. 3 is a front view of the ink cartridge 100 before a film 130 is attached. FIG. 3 is a front view of the ink cartridge 100 after a film 130 is attached. FIG. 3 is a rear view of the ink cartridge 100 before a film 110 is attached.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 Ink cartridge, 111 Ink accommodating part, 120 Cartridge main body, 131, 132 Film, 140 Cover body, 150 Ink supply control means, 160 Ink supply part, 170 Memory | storage means, 180 Engagement lever, 210 Atmosphere side channel | path, 212 Opening, 214 passage, 216 filter accommodation portion, 218 communication hole, 222, 224 communication portion, 230 ink side passage, 232 atmosphere valve storage chamber, 234, 236, 274, 276, 278 communication portion, 240 communication groove, 238, 242 communication hole , 250 Atmospheric valve section, 270 Atmospheric side accommodating chamber, 272 wall, 290 Supply side accommodating chamber, 292 First ink accommodating section, 294 Second ink accommodating section, 296 Channel section, 298, 300 passage, 302, 304 communicating section 604 Seal

Claims (4)

A liquid cartridge for supplying a liquid to a liquid ejecting apparatus ,
A liquid container for containing a liquid;
A supply unit for supplying the liquid stored in the liquid storage unit to the liquid ejecting apparatus;
An atmosphere valve that opens and closes a communication portion that communicates the liquid storage portion and the atmosphere;
An urging portion for urging the atmospheric valve from the liquid storage portion side toward the atmosphere side toward the communication portion in order to seal the communication portion;
Wherein the biasing unit, if the liquid cartridge inside is sealed in a package at a pressure lower than the atmospheric pressure of the liquid storage portion is opened to atmospheric pressure by opening of the package, the inside of the liquid containing portion The atmospheric valve opens the communication portion due to the difference between the pressure and the atmospheric pressure, and when the difference between the pressure inside the liquid storage portion and the atmospheric pressure is weakened, the atmospheric valve has a biasing force that seals the communication portion. Having a liquid cartridge.   The liquid cartridge according to claim 1, wherein the urging portion includes a coil spring.   The liquid cartridge according to claim 1, further comprising a seal that seals the supply unit and is opened when the liquid cartridge is used for the first time. A shaft portion that is a working rod of the atmospheric valve;
A film in contact with the shaft portion;
Further comprising
The biasing portion is weaker than a force obtained by multiplying a differential pressure between the pressure inside the liquid storage portion and the atmospheric pressure when the liquid cartridge is opened by an area of a region where the film is bent in contact with the atmospheric pressure. The liquid cartridge according to claim 1, wherein the atmospheric valve is urged by force.

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