JP2015098132A - Liquid filling method and liquid filling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid filling method and a liquid filling device capable of suppressing increase of gas volume in a liquid storage chamber when releasing a reduced pressure state in a liquid storage container.SOLUTION: A liquid filling method for filling liquid to a liquid storage container having a first chamber that includes a liquid supply part for supplying liquid and an atmosphere communication part for communicating with the atmosphere and stores a negative pressure generating member, and a second chamber that communicates with the first chamber and stores the liquid, includes: a pressure reduction process for sealing the liquid supply part to reduce a pressure in the liquid storage container from the atmosphere communication part; a filling process for filling the liquid into the liquid storage container from the liquid supply part after the pressure reduction process; a pressure reduction relaxation process for relaxing a reduced pressure state in the liquid storage container in a state that atmosphere opening is not performed at the filling process or after the filling process to make the pressure in the liquid storage container to be close to the atmosphere pressure; and an atmosphere opening process for performing atmosphere opening to the liquid storage container after the pressure reduction relaxation process.

Description

  The present invention relates to a liquid filling method and a liquid filling apparatus, and more particularly, to a liquid filling method and a liquid filling apparatus for filling a liquid storage container having a negative pressure generating member storage chamber and a liquid storage chamber.

  As a configuration of the liquid container that supplies the liquid to the recording head, a negative pressure generating member storage chamber that includes a supply port for supplying the liquid and an air communication port that communicates with the air and that stores the negative pressure generating member, and a negative pressure generating member storage A configuration is known in which a liquid storage chamber that communicates with a chamber and stores a liquid is provided.

  Further, as a method of filling the liquid container with liquid, in Patent Document 1, vacuuming is performed from the atmosphere communication port to reduce the atmospheric pressure in the liquid container, and the liquid is injected into the liquid container from the supply port. A method of releasing the reduced pressure state in the liquid container after that.

JP 2000-255081 A

  When the liquid container having the above-described configuration is filled with the liquid by the method of Patent Document 1, the negative pressure generating member containing chamber is filled with the liquid after filling the liquid, and the liquid containing chamber is partially filled with gas. It will be left. Thereafter, when the atmosphere communication port is opened to release the reduced pressure state, the liquid in the negative pressure generating storage chamber moves to the liquid storage chamber, and the gas in the liquid storage chamber is compressed accordingly. At that time, when the adhesion between the negative pressure generating member storage chamber and the partition wall separating the liquid storage chamber and the negative pressure generating member is weak and the difference between the atmospheric pressure and the atmospheric pressure in the liquid storage container is large, the air communication port In some cases, a gas path is generated along the partition wall toward the liquid storage chamber.

  When this gas path is generated, the gas flows into the liquid storage chamber, and the gas volume in the liquid storage chamber increases. When such a liquid storage container is used under a pressure lower than the pressure in the liquid storage container, when the sealing material that has sealed the supply port is removed, the gas in the liquid storage container expands and the liquid Liquid may leak from the container.

  The present invention has been made in view of the above problems. And the objective is to provide the liquid filling method and liquid filling apparatus which can suppress the increase in the gas volume in a liquid storage chamber at the time of canceling | releasing the pressure reduction state in a liquid storage container.

  In order to solve the above-described problems, a liquid filling method according to the present invention includes a first chamber that includes a liquid supply unit that supplies a liquid and an atmospheric communication unit that communicates with the atmospheric air and that houses a negative pressure generating member, and the first chamber. A liquid filling method for filling a liquid container having a second chamber that communicates with the liquid into the liquid container, wherein the liquid supply unit is hermetically sealed from the atmosphere communication unit to the inside of the liquid container. A pressure reducing step for reducing the atmospheric pressure; a filling step for filling the liquid into the liquid container from the liquid supply section after the pressure reducing step; and the atmosphere being opened to the atmosphere in the filling step or after the filling step. In a state where there is no pressure, the reduced pressure state inside the liquid container is relaxed and the pressure inside the liquid container is made close to atmospheric pressure. Open air opening work Characterized in that it comprises a and.

  According to the above configuration, while the liquid is being filled or not opened to the atmosphere after filling, the reduced pressure state in the liquid container is relaxed, and the pressure inside the liquid container is brought close to the atmospheric pressure. Open the container to the atmosphere. By carrying out like this, the rapid change of the atmospheric | air pressure in a liquid container can be suppressed, and the increase in the gas inflow amount to a 2nd chamber can be suppressed.

It is a schematic block diagram which shows an example of the whole structure of an ink filling apparatus. It is sectional drawing which shows the cross section of the ink tank before ink filling. It is sectional drawing which shows the cross section of the ink tank after ink filling. (A)-(f) is sectional drawing for demonstrating each process of an ink filling method. It is a flowchart for demonstrating the filling operation | movement of an ink.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a schematic configuration diagram showing an example of an overall configuration of an ink filling device (hereinafter referred to as “filling device”) 900 as a liquid filling device in the present embodiment. As shown in the figure, the filling device 900 includes a decompression unit (decompression unit) 900a and a filling unit (filling unit) 900b. The filling device 900 includes a jig (not shown) and a control unit (not shown).

  The decompression unit 900a has a configuration in which the atmospheric pressure adjustment chamber 30, the vacuum pump 102, the atmospheric pressure meter 104, the air flow rate adjustment valve 130, and the valves 131 to 133 are connected by pipes 140 to 144.

  The air pressure adjusting chamber 30 is connected to the upper surface of an ink tank (liquid storage container) 1 described later with reference to FIG. 2 via a seal component such as an O-ring. The atmospheric pressure adjusting chamber 30 is configured to be connected to the ink tank 1 so as to surround a space around the atmosphere communication port (atmosphere communication portion) 10 of the ink tank 1 outside the ink tank 1. In addition, a sealing member 31 for sealing the atmosphere communication port 10 of the ink tank 1 is provided inside the atmospheric pressure adjustment chamber 30. The sealing member 31 is driven by the drive unit 100 so as to be movable to a position for sealing the atmosphere communication port 10 and a position for releasing the sealing. As a result, the air communication port 10 is opened and closed.

  In the present embodiment, a pneumatic device capable of setting two positions, a position for sealing the atmosphere communication port 10 and a position for releasing the sealing, is used as the driving unit 100.

  The vacuum pump 102 sucks and exhausts the gas in the ink tank 1 to reduce the pressure in the ink tank 1. The barometer 104 measures atmospheric pressure. The air flow rate adjustment valve 130 includes a valve 130a and a throttle valve 130b, and adjusts the air flow rate according to the throttle condition of the throttle valve 130b. The valve 130a and the valves 131 to 133 open and close each path formed by the pipes 140 to 144.

  The filling unit 900b has a configuration in which an ink reservoir 120, a syringe 122, a valve 134, and a valve 135 are connected by pipes 145 to 147. The ink reservoir 120 stores the ink 20. The ink 20 is sucked into the syringe 122, and the ink is injected from the syringe 122 into the ink tank 1. The piston 122 a of the syringe 122 is driven by the drive unit 106. In the present embodiment, a motor capable of performing strict position control is used as the drive unit 106.

  The filling unit 900 b includes a sealing member 32 that seals the ink supply port (liquid supply unit) 7 of the ink tank 1. The sealing member 32 is driven by a drive unit (not shown) so as to be movable to a position for sealing the ink supply port 7 and a position for releasing the sealing.

  One end of the pipes 140 and 141 and the ink reservoir 120 are open to the atmosphere. The barometer 104, the drive unit 100, the drive unit 106, the drive unit (not shown), and the valves 130 to 135 are controlled by a control unit (not shown). As a result, the measurement value of the barometer 104 and the operation control of the drive unit and the valve are performed.

  The shape of the sealing member 31 and the sealing member 32 is not limited to the plate shape shown in FIG. 1 as long as the atmosphere communication port 10 and the ink supply port 7 can be sealed. For example, the sealing member may have a shape including a protruding portion that protrudes toward the inside of the ink tank 1. In this case, the tip of the projecting portion may be sharpened, and the position of the sealing member with respect to the sealing target may be controlled to finely adjust the amount of the inflowing gas or liquid.

  FIG. 2 is a cross-sectional view showing a cross section of the ink tank 1 in the present embodiment, and shows a cross section of the ink tank 1 before being filled with ink. As shown in the figure, the ink tank 1 has a support member 13 on one side. In the present embodiment, the support member 13 is formed of resin integrally with the exterior (housing) of the ink tank 1, and performs an attaching / detaching operation to a tank holder of an ink jet recording apparatus (hereinafter referred to as “recording apparatus”). The structure is displaceable.

  The ink tank 1 is provided with an engaging portion 14 and an engaging portion 15 that can be engaged with a locking portion on the tank holder side, respectively. In the present embodiment, the engaging portion 14 is integrated with the support member 13, and the engaging portion 15 is provided on a side surface different from the side surface on which the support member 13 is provided. The engagement state of the ink tank 1 to the tank holder is ensured by the engagement between the engaging portion and the locking portion on the tank holder side. The ink tank 1 functions as an ink storage unit that stores ink supplied to an ink jet recording head (hereinafter referred to as “recording head”) mounted on the recording apparatus.

  The bottom surface of the ink tank 1 that faces downward in the gravitational direction (the arrow z direction in the figure) is connected to the ink inlet of the recording head when supplied to the tank holder so as to supply ink in the ink tank 1 to the recording head. Ink supply port 7 is provided. An air communication port 10 is provided on the upper surface of the ink tank 1 on the side opposite to the bottom surface where the ink supply port 7 is provided. The air communication port 10 relieves the negative pressure that increases with the supply of ink to the recording head, communicates the inside of the ink tank with the atmosphere so as to maintain this within a preferable predetermined range, and introduces outside air into the ink tank.

  As shown in FIG. 2, a negative pressure generating member storage chamber 2 and an ink storage chamber 3 are provided inside the ink tank 1. The negative pressure generating member storage chamber 2 and the ink storage chamber 3 are partitioned by a partition wall 5 except for the communication portion 4. The ink storage chamber 3 communicates with the negative pressure generating member storage chamber 2 through the communication portion 4. These storage chambers function as an ink reservoir. The ink supply port 7 and the atmosphere communication port 10 are provided at positions corresponding to the negative pressure generating member accommodation chamber 2 in the ink tank 1.

  An ink supply cylinder 6 is provided on the bottom surface of the negative pressure generating member storage chamber 2, and an ink supply port 7 is provided at the tip of the ink supply cylinder 6 in the arrow z direction. The negative pressure generating member storage chamber 2 stores the negative pressure generating member 8 in the ink supply cylinder 6 and the negative pressure generating member 9 at a position on the + z direction side of the ink supply cylinder 6. The negative pressure generating members 8 and 9 are in a range that balances with the holding force of the meniscus formed in the vicinity of the ejection port of the recording head to prevent ink leakage from the ejection port and allows the ejection operation of the recording head. This is for generating negative pressure. In the present embodiment, the negative pressure generating members 8 and 9 are porous members such as sponges that are impregnated and held with ink.

  A plurality of ribs 11 are formed on the inner wall of the upper surface of the ink tank 1 that defines the negative pressure generating member housing chamber 2, and air is interposed between the upper surface of the negative pressure generating member 9 and the inner wall of the upper surface of the ink tank 1. A buffer chamber 12 is formed.

  FIG. 3 shows a cross section of the ink tank 1 after the ink is filled, and shows an ideal filling state. As shown in FIG. 3, most of the ink containing chamber 3 is filled with ink 20. At that time, it is difficult to fill the entire ink storage chamber 3 with ink, and bubbles 16 may remain. When the volume of the bubble 16 is relatively large, the bubble 16 expands when the user peels off the seal that has sealed the ink supply port 7 of the ink tank 1 in a pressure environment lower than the pressure in the ink tank 1. As a result, the ink 20 may leak out of the ink tank 1.

  In order to prevent this, a certain standard is provided for the volume of the gas remaining in the ink containing chamber 3, and it is required to make the volume of the gas in the ink containing chamber 3 smaller than this standard.

  When the amount of gas flowing into the ink storage chamber 3 increases and the air pressure in the ink tank 1 rises above a certain pressure, the ink tank 1 with the constant pressure inside is opened at the same low pressure. In comparison with the amount of ink that flows out, the amount of ink that flows out increases.

  In the negative pressure generating member accommodating chamber 2, the boundary region between the negative pressure generating members 8 and 9 is filled with an amount of ink 20 required to continuously supply ink to the recording head. In addition, an area 9 a from which ink is extracted after impregnating the ink once is provided on the upper portion of the negative pressure generating member 9. Thus, a region 9a having an appropriate absorption capacity, responding to environmental changes, and preventing ink leakage is provided in the vicinity of the atmosphere communication port 10 of the negative pressure generating member 9.

The ink tank 1 used in the present embodiment has a length (length in the y direction): 62 to 66 mm, a width (length in the x direction): 11 to 13 mm, and a height (length in the z direction): 30. ~ 34 mm. The negative pressure generating member 9 is a rectangular parallelepiped, and the size thereof is: length: 38 to 40 mm, width: 7 to 9 mm, thickness (length in the z direction): 20 to 24 mm, density: 0.11 to 0.14 g / cm ³ . The negative pressure generating member 8 is an oval cylindrical body, and the size thereof is as follows: length in the longitudinal direction: 7 to 9 mm, length in the lateral direction: 5 to 6 mm, thickness: 4.5 to 5.5 mm, density : 0.16 to 0.18 g / cm ³ .

  In the present embodiment, the material of the negative pressure generating members 8 and 9 is polypropylene.

  With reference to FIGS. 4A to 4F and FIG. 5, each step of the ink filling method will be described. 4A to 4F are cross-sectional views for explaining each step of the ink filling method as the liquid filling method in this embodiment, and FIG. 5 is a flowchart for explaining the filling operation.

  When starting the filling operation, first, the ink tank 1 is fixed to the jig of the filling device 900. At that time, the ink supply port 7 is positioned in the direction of the arrow z. Then, the pressure adjustment chamber 30 is brought into contact with the upper surface around the atmosphere communication port 10 of the ink tank 1, and the sealing member 32 is brought into contact with the ink supply port 7 to seal the ink tank 1.

  Next, it progresses to a pressure reduction process (S1). FIG. 4A shows a decompression step. The vacuum pump 102 shown in FIG. 1 is always driven during operation. In the decompression step, decompression in the ink tank 1 is started by opening the valves 132 and 133 shown in FIG. As a result, the air pressure in the ink tank 1 gradually decreases.

  The pressure in the ink tank 1 is reduced to a predetermined pressure (1.0 kPa in this embodiment), and when it is determined that the pressure has reached the predetermined pressure, the valve 132 is closed and the pressure reduction is terminated. The sealing member 31 is brought into contact with the air communication port 10 to seal the atmosphere communication port 10. When it is determined that the predetermined pressure is not reached, the pressure in the ink tank 1 is reduced until the predetermined pressure is reached.

  And it progresses to a filling process (S2). 4B to 4D show a filling step and an atmospheric pressure adjustment step. In the filling step, first, the ink supply port 7 is unsealed while maintaining the reduced pressure state in the ink tank 1. Then, the valve 134 shown in FIG. 1 is opened, and the piston 122a of the syringe 122 is advanced in the direction opposite to the arrow z direction. Thus, a predetermined amount (9.5 cc in this embodiment) of ink 20 is filled into the ink tank 1 from the ink supply port 7 through the pipes 146 and 147.

  As shown in FIG. 4B, ink injection is started from the ink supply port 7, and the ink is permeated in the order of the negative pressure generating members 8 and 9. When the injection is continued, the penetration of the ink 20 reaches the air buffer chamber 12 and the communication portion 4. Then, as shown in FIG. 4C, ink flows into the air buffer chamber 12 and the ink storage chamber 3 from the ink supply port 7 through the negative pressure generating member 9.

  When the specified amount of ink 20 is injected and filling is completed, as shown in FIG. 4D, the ink 20 penetrates the entire area of the negative pressure generating members 8 and 9, and the air buffer chamber 12 is almost entirely covered by the ink 20. It is filled. In the ink storage chamber 3, an unfilled space (hereinafter referred to as “unfilled space”) 33 remains. Since the inside of the ink tank 1 is decompressed in the decompression step, the unfilled space 33 is in a decompressed state even after ink filling.

  In the filling process, as shown in FIGS. 4B to 4D, the ink 20 flows from the negative pressure generating member storage chamber 2 into the ink storage chamber 3. After a predetermined amount of ink is injected and the ink tank 1 is filled with ink, the valve 134 shown in FIG. 1 is closed. In this embodiment, the atmospheric pressure in the ink tank 1 after ink filling is measured by experiment, and the measurement result at that time is 5 kPa.

  In the present embodiment, the atmospheric pressure adjustment step is performed during the filling step or after the completion of the filling step and before the start of the reduced pressure relaxation step (S3). In this step, the valve 130a shown in FIG. 1 is repeatedly opened slightly, the atmospheric pressure is measured using the atmospheric pressure meter 104, the atmospheric pressure in the atmospheric pressure adjustment chamber 30 is adjusted, and the valve 130a is closed when the atmospheric pressure reaches a predetermined atmospheric pressure. . The predetermined atmospheric pressure is a gas path that passes from the atmosphere communication port 10 to the ink storage chamber 3 through the communication portion 4 along the partition wall 5 that separates the negative pressure generating member storage chamber 2 and the ink storage chamber 3 from each other. The pressure is not.

  Here, it was confirmed by an experiment that a gas path from the atmosphere communication port 10 to the ink containing chamber 3 along the partition wall 5 is not generated by setting the pressure in the pressure adjusting chamber 30 to 40 to 70 kPa. When the air pressure in the air pressure adjusting chamber 30 is set to a pressure higher than 70 kPa, the air communication port 10 is connected via the communication portion 4 along the partition wall 5 separating the negative pressure generating member storage chamber 2 and the ink storage chamber 3. It was confirmed by experiments that a gas path leading to the ink containing chamber 3 was generated.

  In this embodiment, the opening time of the valve 130a once is set to 5 to 20 msec. Further, the opening of the valve 130a and the confirmation of the atmospheric pressure in the atmospheric pressure adjustment chamber 30 by the atmospheric pressure measuring instrument 104 are repeatedly performed until the atmospheric pressure in the atmospheric pressure adjustment chamber 30 reaches a predetermined atmospheric pressure of 40 to 70 kPa.

  Next, it progresses to a pressure reduction relaxation process (S4). FIG. 4E shows a reduced pressure relaxation process. In this step, after the filling step and the atmospheric pressure adjustment step, the ink supply port 7 is sealed using the sealing member 32 while maintaining the sealed state of the air communication port 10 and the closed state of the air flow rate adjusting valve 130. And the sealing member 31 is moved to the position which cancels | releases a sealing state, maintaining the closed state of the air flow rate adjustment valve 130, and sealing | blocking of the atmosphere communication port 10 is cancelled | released.

  Then, the air in the air pressure adjustment chamber 30 flows into the ink tank 1 through the air communication port 10 due to the pressure difference between the air pressure in the ink tank 1 in a reduced pressure state and the air pressure in the air pressure adjustment chamber 30. . By the inflow of air, the ink moves from the negative pressure generating member storage chamber 2 to the ink storage chamber 3 through the communication portion 4, and the gas in the unfilled space 33 is compressed.

  Further, the ink present in the air buffer chamber 12 is absorbed by the negative pressure generating member 9 by the movement of the ink 20. As the ink moves further, the ink moves from the upper surface side of the negative pressure generating member 9 toward the lower surface side (z direction), and a region 9 a where the ink is pulled out is formed on the upper surface of the negative pressure generating member 9. . As described above, by providing the area 9a in which the ink is extracted after impregnating the ink once in the vicinity of the atmosphere communication port 10, ink leakage from the atmosphere communication port 10 is prevented.

  In this embodiment, during or after ink filling, a gas path is generated that communicates the pressure difference between the air pressure in the air pressure adjusting chamber 30 and the air pressure in the ink tank 1 from the air communication port 10 to the ink containing chamber 3. In order to obtain a pressure difference that is not performed, the atmospheric pressure in the atmospheric pressure adjustment chamber 30 is adjusted.

  Thereby, even if the gas in the pressure adjusting chamber 30 flows into the ink tank 1 through the atmosphere communication port 10, the gas path leading to the ink containing chamber 3 is not generated, and the gas volume of the ink containing chamber 3 is reduced. Increase can be suppressed. Therefore, when the sealing material that has sealed the ink supply port 7 of the ink tank 1 is peeled off at a pressure lower than the pressure in the ink tank 1, the gas in the ink storage chamber 3 expands and the ink tank The situation where ink leaks from 1 can be prevented.

  In addition, the position of the sealing member 31 in contact with the atmosphere communication port 10 is strictly managed and controlled, so that it is simpler than the configuration in which the amount of gas flowing into the ink tank 1 per unit time is adjusted. According to the configuration, an increase in the gas volume in the ink tank 1 can be suppressed.

  Finally, the process proceeds to the atmosphere release process (S5). FIG. 4F shows the atmospheric release process. In this step, the valves 131 and 133 shown in FIG. 1 are opened to allow the inside of the ink tank 1 to communicate with the atmosphere. Then, the pressure of the unfilled space 33 is made equal to the atmospheric pressure, and the ink movement is stopped. At this time, the unfilled space 33 remains in the ink storage chamber 3 as the bubbles 16.

  Through the above steps, ink filling into the ink tank is completed. In the present embodiment, the atmospheric pressure adjustment step and the reduced pressure relaxation step are performed once. However, in order to suppress the generation of a gas path leading from the atmosphere communication port 10 along the partition wall 5 to the ink containing chamber 3, the pressure adjustment process and the pressure reduction mitigation process are performed a plurality of times, and the pressure inside the ink tank 1 is reduced. It is more desirable to bring it closer to atmospheric pressure in steps. At this time, the atmospheric pressure adjustment process and the decompression relaxation process may be performed a plurality of times, and the atmospheric pressure in the ink tank 1 may be changed by a certain amount to approach the atmospheric pressure.

  Filling the ink tank 1 with ink is completed by the above steps, but the filling device 900 shown in FIG. 1 performs an operation of filling the syringe 122 with ink after filling up to before the next filling. To fill the syringe 122 with ink, first, the valve 135 is opened, and the piston 122a of the syringe 122 is moved backward in the direction of the arrow z by the driving unit 106. As a result, the ink 20 is sucked from the ink reservoir 120 storing the ink 20, and a predetermined amount (9.5 cc in this embodiment) of ink is stored in the syringe 122. Thereafter, by closing the valve 135, the filling operation of the ink 20 into the syringe 122 is completed.

  The contact between the upper surface of the ink tank 1 and the pressure adjusting chamber 30 and the sealing member 31 and the contact between the ink supply port 7 and the sealing member 32 are released, the positioning by the jig is released, and the filling device 900 is filled. The ink tank 1 is removed. Then, the ink supply port 7 of the ink tank 1 is sealed with a seal member (not shown). By going through such an operation, the ink tank 1 filled with ink can be obtained using the filling device 900.

  In the above description, the pressure in the pressure adjusting chamber 30 of the pressure reducing unit 900a is adjusted to allow the pressure adjusting chamber 30 and the ink tank 1 to communicate with each other in a state where the pressure is not released to the atmosphere, thereby reducing the reduced pressure state of the ink tank 1. Thus, the method for opening the ink tank 1 to the atmosphere has been described.

  However, the decompression unit 900 a may be configured not to include the atmospheric pressure adjustment chamber 30. In this configuration, the pressure in the pipe that becomes a closed space by closing the two valves is adjusted by slightly opening and closing one valve, and after the adjustment, the valve is closed and the other valve is opened. The ink tank may be communicated to alleviate the reduced pressure state of the ink tank. That is, a part of the space in the pipe may be used as the atmospheric pressure adjustment chamber.

1 Ink tank (liquid container)
2 Negative pressure generating member storage chamber (first chamber)
3 Ink storage chamber (second chamber)
7 Ink supply port (liquid supply part)
10 Air communication port (atmospheric communication part)

Claims (6)

A liquid container having a liquid supply part for supplying a liquid and a first chamber containing an air communication part communicating with the atmosphere and containing a negative pressure generating member, and a second chamber communicating with the first room and containing a liquid A liquid filling method for filling with liquid,
A depressurization step of sealing the liquid supply unit to depressurize the internal pressure of the liquid container from the atmosphere communication unit;
After the decompression step, a filling step of filling the liquid from the liquid supply unit into the liquid storage container;
In the filling step or after the filling step, in a state where the atmosphere is not opened to the atmosphere, the reduced pressure state inside the liquid container is relaxed, and the pressure inside the liquid container is reduced to the atmospheric pressure. Process,
After the decompression relaxation step, an air release step for opening the liquid container to the atmosphere;
A liquid filling method comprising: In the decompression alleviation step, the air pressure inside the air pressure adjusting chamber surrounding the atmosphere communicating portion outside the liquid container is adjusted to a pressure between the air pressure inside the liquid container and the atmospheric pressure. Adjustment process;
After the filling step and the adjustment step, a relaxation step of releasing the sealed state of the atmosphere communication portion to connect the pressure adjustment chamber and the liquid storage container to alleviate the reduced pressure state inside the liquid storage container; ,
The liquid filling method according to claim 1, wherein:   3. The liquid filling method according to claim 2, wherein the adjustment step and the relaxation step are each performed once or a plurality of times to bring the pressure inside the liquid container close to the atmospheric pressure stepwise.   4. The method according to claim 2, wherein the adjustment step and the relaxation step are each performed once or a plurality of times to change the atmospheric pressure inside the liquid container by a certain amount to approach the atmospheric pressure. The liquid filling method according to 1.   In the adjusting step, the air pressure inside the air pressure adjusting chamber is adjusted to a pressure between the air pressure inside the liquid container and the atmospheric pressure, and the air pressure inside the air pressure adjusting chamber is adjusted from the atmosphere communicating portion. The liquid filling method according to any one of claims 2 to 4, wherein the pressure is set to a pressure at which a gas path toward the second chamber is not generated. A liquid container having a liquid supply part for supplying a liquid and a first chamber containing an air communication part communicating with the atmosphere and containing a negative pressure generating member, and a second chamber communicating with the first room and containing a liquid A liquid filling device for filling a liquid,
A depressurization unit that depressurizes the pressure inside the liquid storage container from the atmosphere communication unit in a state where the liquid supply unit is sealed, and a filling unit that fills the liquid storage container from the liquid supply unit With
The decompression unit relaxes the decompressed state inside the liquid storage container during the filling of the liquid by the filling part or after filling, and increases the atmospheric pressure inside the liquid storage container. A liquid filling apparatus, wherein the liquid container is opened to the atmosphere after being close to atmospheric pressure.

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