JP2003211686A - Liquid storage container and head cartridge using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a superiorly reliable, inexpensive and compact liquid storage container which can surely prevent a liquid from leaking from a storage part to the outside even in a long-term use. <P>SOLUTION: There are set an atmosphere communication port 2c for enabling the air to circulate between the inside and the outside of the storage part 2 where the liquid is stored, an atmosphere communication path for guiding the atmosphere from the atmosphere communication port 2c to a predetermined atmosphere suction port 8a, a gas-liquid separating member 9 for blocking the liquid in the storage part 2 not to circulate from the atmosphere communication port 2c to the atmosphere communication path and enabling the air to circulate at the atmosphere communication port 2c, and liquid block walls 10 and 12 for blocking the liquid not to circulate in a space 7 formed from the gas-liquid separating member 9 to the atmosphere suction port 8a and enabling the air circulation. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid storage container that can be used as a tank for supplying liquid (ink) used in various recording fields to a liquid ejecting means, and a head cartridge using the same. is there.

[0002]

2. Description of the Related Art An ink jet recording apparatus has the advantage that it can be easily made smaller and lighter and can be constructed at a lower cost than a laser beam printer using toner as a recording material. It is the best one. Particularly in recent digital cameras, an ultra-small ink jet recording apparatus that can be mounted on the camera body or made portable has been proposed and implemented so that captured images can be recorded on the spot.

In such an ultra-small ink jet recording apparatus, a head cartridge formed by integrally connecting a liquid ejecting means for ejecting ink and a liquid storage container for supplying liquid to the liquid ejecting means is provided with respect to a carriage. It is known that it is detachably mounted. Since this liquid storage container can store only a small amount of ink, in such an ultra-small ink jet recording apparatus, a so-called pit-in system is used in which the liquid is frequently replenished from the main tank as a liquid supply source provided in the recording apparatus main body. A system is also proposed.

When replenishing the liquid storage container with the pit-in system, first, the carriage is moved to a predetermined replenishment position set at the end of the moving path or the like, and the liquid storage container is moved to that position. While connecting to the main tank, a cap connected to the pump is brought into close contact with the ink ejection port of the recording element arranged in the ejection unit. After that, the negative pressure generated by the pump is applied to the inside of the cap, the negative pressure sucks the ink from the ink discharge port, and the suction operation causes the ink to be replenished by sucking the ink from the main tank into the liquid storage container. To do.

When replenishing the ink by such a so-called pit-in system, it is necessary to replenish the liquid storage container with a predetermined amount of ink without excess or deficiency. In particular, when the liquid is excessively replenished in the liquid storage container and overflows from the atmosphere communication port (overflow), a serious problem occurs that the inside of the recording apparatus and the recording medium are contaminated.

Therefore, conventionally, the following measures have been taken in order to prevent excessive ink supply. a) At the time of ink replenishment, a check valve is provided in a portion of the liquid storage container portion that is open to the atmosphere (atmosphere communication port) so that the liquid is filled while the gas is open to the atmosphere to keep the liquid storage container portion full. When it exceeds, the open / close control of the check valve is performed to prevent the ink from overflowing and the ink is filled. b) A water-repellent fiber film made of a porous material that allows gas to pass through but does not allow liquid such as ink to pass through is attached to the atmosphere communication port, and when the ink is replenished to the liquid storage container, this film has water repellency and ventilation. It has been proposed to fill the ink while eliminating the internal air depending on the property, and to replenish by the meniscus holding force of the film.

[0007]

However, the conventional apparatus has a structure in which a water-repellent fiber membrane made of a porous material is attached to the atmosphere communication port, so that the cost and size are reduced. However, if the ink adheres to the porous film for a long period of time, the wettability of the ink will affect the film's ability to hold the meniscus against the ink, Sometimes overflowed from the atmosphere communication hole. In addition, when the liquid membrane between the porous membrane and the storage portion is deteriorated due to a defect in the adhered portion of the porous membrane or deterioration of the adhered adhesive, the ink overflows from the atmosphere communication hole. There was also.

When the function as the check valve for separating the liquid (ink) and the gas by the porous film, that is, the function as the gas-liquid separating member cannot be sufficiently fulfilled as described above, Ink may pass through the atmosphere communication port and leak to the outside of the head cartridge to contaminate the inside of the device.In some cases, the ink may leak to the entire system that supplies ink, causing a short-circuit in the electrical system. There was also a possibility of causing a fatal malfunction.

The present invention has been made in view of the above-mentioned problems of the prior art. In a liquid storage container for supplying a liquid to a liquid ejecting means, even if the liquid storage container is used for a long period of time, the liquid is stored from the storage portion to the outside. It is an object of the present invention to provide an inexpensive and small-sized liquid storage container having excellent reliability and capable of reliably preventing water from leaking.

[0010]

In order to achieve the above object, the present invention is a liquid storage container for supplying a liquid to a liquid ejection head, the storage part storing the liquid, and the storage part formed in the storage part. A liquid supply port connected to a predetermined liquid supply source, an atmosphere communication port that allows air to flow between the inside and the outside of the storage unit, and an atmosphere from the atmosphere communication port to a predetermined atmosphere suction port. An air communication passage that guides the liquid, and a liquid in the storage unit that blocks the circulation of the air from the atmosphere communication port to the atmosphere communication passage, and a gas-liquid separation member that enables the flow of air in the atmosphere communication port, A liquid obstructing wall that prevents the flow of liquid and allows air to flow in the space from the gas-liquid separating member to the air suction port in the air communication passage, and the liquid overflowing into the air communication passage The liquid reaches the atmosphere suction port It is characterized in that it has to be prevented by failure walls.

Further, in the above-mentioned invention, it is desirable that the gas-liquid separating member is made of a porous member, and further, that the water-repellent treatment is performed. Further, it is conceivable that the liquid obstruction wall is formed to project on at least one of the upper, lower, left and right inner surfaces of the atmosphere communication passage. For example, it is conceivable to form one or a plurality of liquid obstruction walls along the direction intersecting the flow direction of the air flow on the lower surface in the atmosphere communication passage, and when a plurality of liquid obstruction walls are formed, they are adjacent to each other. It is desirable to form a gap that allows gas to pass through at different positions on the left and right sides of the liquid obstruction wall.

Further, an upper liquid obstruction wall is provided so as to project from an upper surface in the atmosphere communication passage, and a lower liquid obstruction wall is provided so as to protrude from a lower surface in the atmosphere communication passage, and the upper liquid obstruction wall and the lower side are provided. While the liquid obstruction walls are alternately arranged, gaps for passing air may be formed between the upper liquid obstruction wall and the lower surface and between the lower liquid obstruction wall and the upper surface, respectively. . Further, it is possible to provide a liquid detection sensor in the atmosphere communication passage in the atmosphere communication passage.

Further, the atmosphere communication passage is formed by a lid part attached to the container body so as to cover the atmosphere communication port, and an air suction port for introducing the atmosphere is formed in the lid part and the atmosphere suction is performed. It is conceivable to form an atmosphere communication space that connects the mouth and the atmosphere communication port.

It is also possible to construct a head cartridge by the above-mentioned liquid storage container and liquid discharge means which is connected to the liquid storage container and discharges the liquid supplied from the liquid storage container.

Furthermore, in the liquid discharge means,
As an element that generates energy for ejecting a liquid, it is desirable to use an electrothermal converter that generates thermal energy for causing film boiling in the liquid, in order to realize miniaturization of the device.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

(First Embodiment) FIG. 1 is a partially cutaway perspective view showing a structure of a liquid storage container according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an ejection unit (liquid ejection means) for ejecting a liquid, and a plurality of known recording elements for ejecting the liquid are arranged. In the first embodiment, the liquid supplied to each recording element from the common liquid passage formed in the ejection unit 1 is ejected by driving the electrothermal conversion element arranged in each recording element. It is supposed to be. That is, each recording element generates Joule heat in the electrothermal conversion element by energization, causes film boiling in the ink by the Joule heat to generate bubbles in the liquid passage, and the generated energy of the bubbles causes the ink to be electrically converted. A so-called bubble jet (registered trademark) discharge method for discharging from a heat conversion element is adopted. The liquid ejected from the ejection unit 1 is a liquid (color material) ejected for the purpose of visual recognition on a recording medium, and a liquid ejected for the purpose of adjusting the permeation state of the color material ( Recording-improving liquid)
In the following description, these liquids are also collectively called ink.

T1 is a liquid storage container for supplying ink to a common liquid chamber that communicates with each recording element of the ejection unit 1, and is constructed as follows. That is, in this liquid storage container T1, 2 is a hollow box shape (hollow rectangular parallelepiped shape).
The storage unit 2 is An ink supply port (liquid supply port) 2a is provided at the bottom of the storage unit 2 so as to be connectable to and detachable from a predetermined ink supply source, and at the time of connection, supply ink from the ink supply source into the storage unit 2. A connecting hole 2b into which a cylindrical connecting portion 1a protrudingly provided on the upper surface of the discharge unit 1 is inserted is formed, while an atmosphere communication port 2c is formed in the upper surface portion of the storage unit 2. The connection portion 1a of the ejection unit 1 is in communication with the common liquid chamber, and the connection portion 1a is fitted into the connection hole 2b of the ejection unit 1 so that the ink storage space in the storage unit 2 and the ejection unit 2 1
Communicates with the common liquid chamber.

On the other hand, 6 is a lid portion fixed to the upper surface of the liquid storage container T1. The lid portion 6 is an atmosphere communication space 7
Has a hollow shape. Further, an opening 7a communicating with the atmosphere communicating space 7 is formed at the bottom of the lid 6, and an atmosphere communicating pipe 8 communicating with the atmosphere communicating space 7 is inserted and fixed to the side portion, One end of the atmosphere communication pipe 8 serves as an atmosphere suction port 8a that is open to the atmosphere. Further, a porous member 9 is fixed to the opening 7a of the lid 6, and when the lid 6 is fixed to the storage unit 2, the porous member 9 makes the atmosphere communication port 2c liquid-tight. It is designed to cover. A water-repellent agent (not shown) is applied to the atmosphere communication space 7 side of the porous member 9 and has a structure as a gas-liquid separation valve that is permeable to gas but impermeable to liquid (ink). is doing.

Further, on the lower surface of the atmosphere communication space 7, there is a partition wall-shaped liquid obstruction wall 10, 1 having a substantially triangular prism shape.
A plurality of (2 in this case) 2 are arranged at a constant interval. Of these, one of the liquid obstruction walls 10 is configured to extend along a direction substantially orthogonal to the extending direction of the atmosphere communication pipe 8, and the minute gap 1 is provided between the liquid obstruction wall 10 and one inner surface of the lid portion 6.
0a is formed. Also, the other liquid obstacle wall 12
Are arranged between the liquid obstruction walls 10 substantially in parallel with them, and a minute gap 12a is formed between the liquid obstruction walls 10 and one inner side surface. As a result, a passage R1 that is bent a plurality of times is formed in the atmosphere communication space 7 from the opening 8b of the atmosphere communication pipe 8 to the atmosphere communication port 2c. The atmosphere communication space 7 and the atmosphere communication pipe 8 form an atmosphere communication passage from the atmosphere suction port 8a to the atmosphere communication port 2c.

By the way, the porous member 9 can be applied with various structures. For example, it is considered that the porous member 9 is composed of a multi-fibrous body obtained by laminating and sintering fibrous resin or metal. In this case, the gas permeating amount is converted into a theoretical hole diameter, and the fiber diameter and the density after sintering are determined so that the theoretical hole diameter can be obtained.

The lid portion 6 and the storage portion 2 form a liquid storage container T1, and the liquid storage container T and the discharge unit 1 form a head cartridge HC. The head cartridge HC is used for ink jet recording. It is designed to be detachably mounted on the carriage of the device.

FIG. 2A is a vertical sectional side view showing a state in which the liquid storage container T1 is being replenished with the ink In. FIG. 2 shows a state in which the ink In is being replenished from the ink supply port 2a, and in the figure, B is a liquid surface level (replenishment position) corresponding to the ink liquid amount required for performing a predetermined amount of continuous recording. Is shown. The ink In is replenished from the ink supply port 2a, and the suction force to be replenished is the atmosphere communication tube 8
It is carried out by suction negative pressure such as a pump connected to.

Then, the replenishment of the ink In progresses, and the liquid level of the ink In exceeds the liquid level B corresponding to the ink liquid amount required for performing a predetermined amount of continuous recording.
When reaching the upper surface of the porous member 9, that is, the lower surface of the porous member 9 attached to the lid portion 6 (when the porous member 9 is full), the water-repellent action applied to the porous member 9 and the hole 9a of the porous member.
The suction pressure of the pump is adjusted so that the ink suction operation by the pump is stopped by the meniscus force at.

After that, when the ink for recording is ejected from the ejection unit 1, the ink I in the storage section 2 is gradually increased.
n is consumed, and the liquid level of the ink In gradually decreases. After that, the pump can be operated at an appropriate timing to suck air from the air suction port 8a to refill the ink from the ink supply port 2a.

However, when the ink In adheres to the porous member 9 for a long period of time, such as when the ink is completely replenished, the ink meniscus in the porous member 9 is retained due to the wettability of the ink In. Performance of the porous member 9 may be deteriorated, or the adhered portion of the porous member 9 may be damaged or the adhesive for adhering may be deteriorated. As a result, the porous member 9 may not fully function as a check valve for separating gas and liquid, and the ink In may overflow into the atmosphere communication space 7 forming a part of the atmosphere communication passage. is there.

FIG. 3 shows a state in which the ink In overflows into the atmosphere communication space 7. Figure 3 (a)
Shows a state in which the ink In leaked into the atmosphere communication space 7 exists only near the porous member 9, and in this state, the ink leaks from the porous member 9 due to long-term storage or the like. It is believed that there is. In addition, FIG.
Is the liquid storage container T1 in the state shown in FIG.
The drawing shows a state in which the atmosphere communication pipe 8 is connected to an intake source and air suction is started in order to fill the ink into the ink.

As shown in FIG. 3, when the suction of air is started, the ink In leaked to the atmosphere communication space 7 is discharged as shown in FIG.
As shown in (b), it gradually leads to the opening 8b formed at the other end of the atmosphere communication pipe 8. However, as described above, a plurality of liquid obstacles are present in the atmosphere communication space 7. Wall 10, 1
Since the passage R1 that is bent a plurality of times is formed by 2, the liquid obstacles 10 and 12 move extremely slowly while being prevented from moving. Therefore, the ink In is prevented from being directly guided to the opening 8b of the atmosphere communication tube 8,
The ink In covers the periphery of the porous member 9.
Therefore, even if the air suction operation is started, the air suction force by the pump is cut off, and the ink replenishment operation is stopped in a state where almost no ink is stored in the storage unit 2. Therefore,
In this ink storage state, the ink In
The ink In does not flow in, and the ink In that has already leaked into the atmosphere communication space remains inside the atmosphere communication space 7 and is prevented from flowing out.

Then, when the air suction operation is stopped, the recording operation is restarted, but in reality, the ink filling amount in the storage unit 2 is the ink required for performing a predetermined amount of continuous recording. Since the liquid level is lower than the liquid level B (see FIG. 2) corresponding to the amount (the liquid level C in the figure), the ink shortage occurs before the recording of the predetermined amount and the recording operation is Stop on the way. The interruption of the recording operation allows the user to recognize to the user that a problem such as ink leakage has occurred in the liquid storage container T1.

Moreover, the leakage of the ink in this case can be limited to the leakage of the ink In from the storage section 2 into the atmosphere communication passage, rather than the leakage of the ink from the liquid storage container T1 to the outside. There is no problem that the inside of the recording device is polluted or the electric system is short-circuited with ink.

As described above, according to the first embodiment, since the liquid obstacle walls 10 and 12 are provided in the atmosphere communication space 7, the structure is extremely inexpensive and small. A storage container T1 can be provided.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. The same or corresponding parts as those in the first embodiment are designated by the same reference numerals. In the second embodiment, the storage section 2 and the lid section 6 constitute a liquid storage container T2, and the liquid storage container T2 and the ejection unit (liquid ejection means) 1 constitute a head cartridge HC. Therefore, the configuration of the storage unit 2 is the same as that shown in the first embodiment. However, in the second embodiment, the shape of the liquid obstruction wall provided in the atmosphere communication space 7 of the lid 6 is different. That is, the upper surface 6a of the lid 6 is provided with a plurality of substantially triangular prism-shaped upper liquid obstruction walls 20 projecting downward, and the lower surface 6b of the lid 6 is provided with a triangular prism lower liquid obstruction wall. A plurality of 22 are provided so as to project upward.

A minute gap 23 is formed between the lower end of the upper liquid obstruction wall 20 and the lower surface, and a minute gap 24 is formed between the upper end of the lower liquid obstruction wall 22 and the upper surface. Are formed. As a result, in the atmosphere communication space 7,
A path R2 that bends up and down is formed in the upper and lower minute gaps 23 and 24. The atmosphere communication space 7 and the atmosphere communication pipe 8 form an atmosphere communication path from the atmosphere communication port 2c to the atmosphere suction port 8a.

In the second embodiment configured as described above, when the sticking force or the ink meniscus force of the porous member 9 is lowered due to a long-term contact between the ink and the porous member, etc. The ink In may leak into the atmosphere communication space 7. When the ink In leaks into the atmosphere communication space 7, the ink In becomes
As the air flows, the air flows to the downstream side, that is, the atmosphere communication pipe 8 side, and reaches the passage R2.

As described above, the passage R2 has the minute gap 2 formed by the liquid obstruction walls 20 and 22 protruding from the vertical direction.
Since the channels 3 and 24 are formed, the flow of air is possible, but the flow of the liquid is blocked by the minute gaps 23 and 24, and it is prevented from reaching the atmosphere communication pipe 8.

However, there is a possibility that the ink In that first reaches the atmosphere communication space 7 reaches the minute gap 23 located on the lower side as shown in the drawing, penetrates the minute gap 23, and oozes into the passage R2. Since the ink In is blocked by the liquid obstacle wall 22 formed further downstream, and the minute gap 24 through which the air flows is formed above, the ink In may pass there. Is extremely low. Moreover, since the liquid obstruction walls 20 and 22 and the minute gaps 23 and 24 are further present in the subsequent stage, the leakage of the ink In to the atmosphere communication pipe 8 is reliably prevented. Therefore, the ink I
The leakage of n does not cause the inconvenience such as the inside of the recording device being contaminated or the electric system being short-circuited.
It is possible to provide a highly reliable liquid storage container T2.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG. The same or corresponding parts as those in the first embodiment are designated by the same reference numerals. In the third embodiment, the storage section 2 and the lid section 6 form a liquid storage container T3, and the liquid storage container T3 and the ejection unit 1 form a head cartridge HC. The configuration of No. 2 is the same as that shown in the first embodiment. However, in the third embodiment, the liquid detection sensor 13 that detects the leaked ink is provided in the atmosphere communication passage of the storage unit 2, which is the same as the first embodiment. different.

Also in this third embodiment,
When ink leaks from the atmosphere communication port 2c into the atmosphere communication passage, the ink leaked by the liquid obstruction walls 10 and 12 may be retained in the atmosphere communication space 7 as in the first embodiment. At the same time, the liquid detection sensor 13 senses the ink leaked into the atmosphere communication space 7, and the terminal 1
A trouble occurrence signal is output from 8 and 19. This trouble occurrence signal is input to the recording device, and the recording device receiving the signal immediately stops the recording operation,
In order to inform the liquid storage container T3 that a trouble has occurred in the ink tank, an indicator or a buzzer is driven.

As described above, in the third embodiment, since it is possible to prevent the ink from leaking out of the liquid storage container T3, it is possible to obtain the high reliability as in the first embodiment. . In addition, when ink leaks into the atmosphere communication passage of the liquid storage container T3, the user is immediately notified of the ink leak, and it is possible to prompt replacement in advance before the recording operation is started in an insufficient ink storage state. This makes it possible to avoid unnecessary recording operation.

In each of the above embodiments, the liquid obstacle wall 1
Although 0, 12, 20, and 22 have a substantially triangular prism shape, the liquid obstruction wall may take other shapes, and the present invention is not particularly limited to the above embodiment. .

Further, the liquid obstruction wall can be formed by various members. In each of the above embodiments,
The case where the lid portion 6 and the storage portion 2 are integrally molded with resin or the like is shown. However, the lid portion 6 and the storage portion 2 and the liquid obstacle may be separately formed, and the necessary number of liquid obstacle walls may be bonded according to the fluidity of the ink. It is also possible to form the liquid obstruction wall with a multi-fibrous body obtained by laminating and sintering fibrous resin or metal, and in this case, the liquid obstruction wall itself has a function of holding ink. , Ink is guided to the atmosphere communication pipe side,
It can be prevented more reliably.

[0042]

As described above, in the liquid storage container and the head cartridge according to the present invention, the liquid in the storage portion is
A gas-liquid separation member that blocks the circulation from the atmosphere communication port provided in the storage section to the atmosphere communication passage and enables the air to flow in the atmosphere communication port; and the gas-liquid separation in the atmosphere communication passage. By providing a liquid obstruction wall that prevents the passage of liquid and allows air to flow in the space from the member to the atmosphere suction port, the liquid obstruction wall prevents the outflow of liquid from the atmosphere suction port to the outside. It is possible to reliably prevent it, and it is possible to obtain high reliability with an inexpensive and small-sized configuration. Therefore, if the liquid storage container and the head cartridge of the present invention are applied to a recording apparatus, it is possible to eliminate stains in the apparatus due to ink leakage and adverse effects on the electric system, and it is possible to reduce the occurrence of failure of the recording apparatus. At the same time, the life can be improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a first embodiment of a liquid storage container according to the present invention.

2 (a) is a vertical cross-sectional side view showing a state where ink is being replenished in the liquid storage container shown in FIG. 1, and FIG. 2 (b) is a partial cross-sectional plan view of what is shown in FIG.

FIG. 3 is a vertical cross-sectional side view showing a state in which the ink in the storage section of the liquid storage container shown in FIG. 1 leaks into the atmosphere communication passage, and (a) is an initial stage where the ink leaks into the atmosphere communication passage. FIG. 4B shows a state in which the suction of air is started by being connected to the intake source for filling the liquid storage container with ink from the air communication port.

FIG. 4 is a vertical cross-sectional side view showing a second embodiment of the liquid storage container according to the present invention.

FIG. 5 is a vertical cross-sectional side view showing a third embodiment of the liquid storage container according to the present invention.

[Explanation of symbols]

HC head cartridge T1, T2, T3 liquid storage container R1, R2 passage 1 Discharge unit 2 storage 2a Liquid supply port 2b connection port 2c atmosphere communication port 6 Lid 7 atmosphere communication space 8 atmosphere communication pipe 8a Air suction port 8b opening 10, 12 Liquid obstacle wall 20 Upper liquid obstruction wall 22 Lower liquid obstacle wall 13 Liquid detection sensor

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2C056 EA16 EA21 EA24 EA26 EB21                       EB29 EC26 EC67 FA03 FA10                       KB37 KB40 KC16 KC17 KC30

Claims (12)

[Claims] 1. A liquid storage container for supplying a liquid to a liquid ejection head, a storage section for storing the liquid, a liquid supply port formed in the storage section and connected to a predetermined liquid supply source, An atmosphere communication port that allows air to flow between the inside and the outside of the storage unit, an atmosphere communication path that guides the atmosphere from the atmosphere communication port to a predetermined atmosphere suction port, and the liquid in the storage unit is the atmosphere. A gas-liquid separation member that blocks the flow from the communication port to the atmosphere communication passage and allows the air to flow in the atmosphere communication port; and an air suction port from the gas-liquid separation member in the atmosphere communication passage. A liquid obstruction wall that blocks the flow of liquid and allows air to flow in the space leading to the space, and prevents the liquid overflowing in the atmosphere communication passage from reaching the atmosphere suction port by the liquid obstruction wall. Characterized by doing Liquid storage container for. 2. The liquid storage container according to claim 1, wherein the gas-liquid separating member is made of a porous member. 3. The liquid storage container according to claim 1, wherein the gas-liquid separating member is subjected to water repellency treatment. 4. The liquid storage container according to claim 1, wherein a plurality of the liquid obstruction walls are arranged in the atmosphere communication passage. 5. The liquid storage container according to claim 1, wherein the liquid obstruction wall is formed to project on at least one of upper, lower, left and right inner surfaces of the atmosphere communication passage. 6. The liquid storage container according to claim 1, wherein at least one liquid obstruction wall is formed on a lower surface of the atmosphere communication passage along a direction intersecting a flow direction of the air flow. 7. A plurality of liquid obstruction walls are sequentially arranged side by side on the lower surface in the atmosphere communication passage, and gaps are formed at positions different from each other on the left and right sides of adjacent liquid obstruction walls. The liquid storage container according to claim 6. 8. An upper liquid obstruction wall is projected on an upper surface of the atmosphere communication passage, and a lower liquid obstruction wall is protruded on a lower surface of the atmosphere communication passage, and the upper liquid obstruction wall and the lower liquid obstruction wall are provided. While the obstacle walls are alternately arranged, gaps for passing air are formed between the upper liquid obstacle wall and the lower surface and between the lower liquid obstacle wall and the upper surface, respectively. Item 7. A liquid storage container according to any one of items 1 to 6. 9. The liquid storage container according to claim 1, further comprising a liquid detection sensor in the atmosphere communication passage in the atmosphere communication passage. 10. The atmosphere communication path is formed by a lid part attached to the container body so as to cover the atmosphere communication port, and the lid part is provided with an atmosphere suction port for introducing the atmosphere and the atmosphere suction port. An atmosphere communication space is formed which connects the mouth and the atmosphere communication port.
10. The liquid storage container according to any one of 1 to 9. 11. A liquid storage container according to any one of claims 1 to 9, and a liquid ejection means connected to the liquid storage container for ejecting a liquid supplied from the liquid storage container. A head cartridge that does. 12. The liquid ejecting means includes an electrothermal converter that generates thermal energy for causing film boiling in the liquid, as an element that generates energy for ejecting the liquid. The head cartridge according to claim 11.