JP4890817B2 - Ink tank - Google Patents

Description

  The present invention relates to an ink tank that can supply ink contained therein to the outside.

  The ink tank is provided, for example, in an ink jet recording apparatus that records an image using an ink jet recording head, and supplies ink to the ink jet recording head.

  As an ink jet recording head, one that ejects ink by various methods is known, and an ink jet recording apparatus ejects ink from an ink ejection port of an ink jet recording head to a recording surface of a recording medium. Make a record. This is a so-called non-impact recording method. Such an ink jet recording apparatus has many advantages such as being capable of recording on various recording media, being capable of high-speed recording, and having low noise during recording, such as a printer, a word processor, a facsimile, Widely used as a recording mechanism in copying machines and the like.

  FIG. 14 is a cross-sectional view schematically showing a conventional ink tank constituting a recording head cartridge (Patent Document 1). As shown in the figure, the recording head cartridge H1000 includes a recording head H1001 and an ink tank T2000.

  The ink i5000 in the recording head H1001 forms a meniscus and is held in the vicinity of the ejection port H1003. In this state, by driving the recording element H1002 having a heating resistor, the ink i5000 is ejected using the generated thermal energy. That is, the ink i5000 on the heat acting surface of the heating resistor is rapidly heated to cause film boiling, and the ink i5000 can be ejected from the ejection port H1003 by the pressure of bubbles generated at that time. The ink tank T2000 includes an ink storage portion T2001 that stores the ink i5000, and an ink supply port T2002 that supplies the ink i5000 to the recording head H1001. Further, the ink tank T2000 has a mechanism for holding the inside of the ink containing portion T2001 at a negative pressure in order to prevent ink leakage from the ejection port H1003 or the ink supply port T2002. It is held by the following configuration.

  That is, the ink storage portion T2001 includes a container T2003 and a flexible member T2004 that covers the opening of the container T2003, and the flexible member T2004 can be displaced according to the negative pressure inside the ink storage portion T2001. . The flexible member T2004 is elastically biased by being coupled to the support portion T2006 via the spring member T2005, or the flexible member T2004 itself has elasticity.

  FIG. 15 is a cross-sectional view for explaining another example of a conventional ink tank (Patent Document 2). The ink tank 1 has a rigid container 2 and an ink container 3 accommodated therein, and ink 4 is stored inside the ink container 3. The rigid container 2 includes a container body 5 that is open on the upper side and a container lid 6 that seals the opening of the container body 5. The container lid 6 is formed with an air communication hole 8 that opens the inside 7 of the rigid container 2 to the atmosphere. The ink container 3 is substantially the same size as the inside 6 of the rigid container 2, and has a rectangular cross section in which the first end plate member 11, the second end plate member 12, and both ends made of a flexible thin film are opened. And the coil spring 14 disposed between the first and second end plate members 11 and 12. The ink 4 in the ink container 3 is supplied to an ink jet printer or the like from the ink takeout hole 17 through a filter.

  In the ink tank 1 having such a configuration, the biasing force of the coil spring 14 acts in the direction of expanding the internal volume of the ink storage unit 3, thereby applying a negative pressure to the ink 4 in the ink storage unit 3. It will be.

  FIG. 16 is a cross-sectional view for explaining still another example of a conventional ink tank (Patent Document 3). The ink tank 127 includes a spring unit that is a combination of two springs 107 and two pressure plates 109, and a flexible tank sheet (flexible member) 106. The ink in the ink tank 127 is supplied to the inkjet head through an ink supply port formed in the frame 115.

  The ink tank 127 configured as described above is balanced with an appropriate negative pressure, that is, a holding force of the meniscus formed in the nozzle until the internal volume of the ink tank 127 is minimized, and the ink tank 127 An appropriate negative pressure that enables the ink ejection operation can be generated.

JP 59-98857 A JP 2002-326368 A JP 2003-53989 A

  By the way, the negative pressure held inside the ink tank as described above is not only when the ink tank is in a static state, but also during transportation, above sea level, or when an impact or vibration is applied. Must be maintained. This is because if the negative pressure in the ink tank cannot be maintained due to the pressure caused by the external acceleration, ink may leak from the ink tank. Further, when the ink tank constitutes an ink jet cartridge together with the recording head, the ink may leak from the recording head.

  However, the ink tanks described in Patent Documents 1, 2, and 3 are not particularly considered with regard to positively suppressing a decrease in negative pressure when an impact or vibration is applied. Therefore, it has been necessary to always generate a negative pressure in the ink containing portion that overcomes the maximum pressure for pushing the ink to the outside when an impact or vibration is applied. That is, it is necessary to always generate a sufficient negative pressure in anticipation of a decrease in the negative pressure assuming that the negative pressure in the ink tank is reduced when an impact or vibration is applied to the ink tank.

  The present invention has been made in view of the above problems, and can maintain a negative pressure in an ink containing portion even when an impact is applied from various directions without always generating an excessive negative pressure. An object of the present invention is to provide an ink tank capable of performing

Ink tank of the present invention, at least a portion of the ink accommodating portion is formed by a flexible material, provided with a displacement of a movable member in the ink accommodating portion, the movable member of the ink accommodating portion by the urging member In an ink tank that is urged outward and can supply the ink in the ink storage part from the ink supply part to the outside, the periphery of the movable member is formed by the flexible material that can be displaced as the ink flows The urging member urges the movable member to protrude outwardly from the ink containing portion, and the ink supply portion is located at a position facing the movable member in the ink containing portion. A communication path communicating with the inside of the ink accommodating portion through the formed opening is provided.

  The ink tank of the present invention maintains an appropriate negative pressure for preventing ink leakage under normal use, and the ink in the ink containing portion is flexible when the ink tank is dropped or an external impact is applied. Actively utilizing the action of spreading a part of the sex member outward to suppress the internal negative pressure drop. As a result, even when an impact is applied, the internal negative pressure can be maintained, ink leakage can be prevented, and a highly reliable ink tank can be provided.

  Hereinafter, embodiments of the ink tank of the present invention will be described with reference to the drawings.

(First embodiment)
The ink jet recording apparatus in which the ink tank of this example is mounted is a so-called non-impact recording type recording apparatus, which can perform high-speed recording and recording on various recording media, and hardly generates noise during recording. It has the characteristics. For this reason, it is widely adopted as a device that bears a recording mechanism such as a printer, a word processor, a facsimile machine, and a copying machine.

  FIG. 1 is a perspective view illustrating a basic configuration of a general ink jet recording apparatus, which includes an apparatus main body M1000, a feeding unit M3022, and a discharge tray M1004.

  FIG. 2 is a perspective view showing the inside of the apparatus main body M1000, which includes a chassis M3019 and recording operation mechanisms. A carriage M4001 movable in the main scanning direction indicated by an arrow X is detachably mounted with a recording head cartridge (not shown) for performing desired recording on a recording sheet (recording medium) conveyed to a recording position. The recording sheet is conveyed at the recording position in the sub-scanning direction indicated by an arrow Y that intersects the main scanning direction. The recording head cartridge includes a recording head and an ink tank that is detachable from the recording head. The recording head, for example, heats ink by an electrothermal conversion element, and ejects ink droplets from an ejection port by utilizing the action of ink film boiling.

  3A and 3B are diagrams for explaining the ink tank T2000 of this example, in which FIG. 3A is a perspective view from above, and FIG. 3B is a perspective view from below. The ink tank T2000 is a container that stores ink, and includes a container body T2017 and a lid member T2018 as shown in FIG. 3, and an ink supply port T2002 for supplying ink to a recording head (not shown) is the container body T2017. It is formed on the bottom surface.

  FIG. 4 is an exploded perspective view of the ink tank T2000. FIG. 5 is a cross-sectional view taken along line VV in FIG. 3, (a) is a diagram illustrating a state where ink is fully filled, and (b) is a state where about half of the ink is used. FIG.

  The ink tank T2000 includes a container body T2017 and a lid member T2018, which include a spring member T2005, a plate member T2022, a flexible film T2011, a meniscus member T2020, a presser plate T2021, and a film member T2019, which will be described later.

  The flexible film T2011 and the plate member T2022 attached to the central portion thereof constitute a movable member, and the ink containing portion T2001 is formed by the movable member and the container main body T2017. The movable member is biased by the spring member T2005, and thus is maintained in a convex shape protruding outward from the container body T2017. When the ink is fully filled in the container main body T2017 as shown in FIG. 5, the inner side of the movable member occupies a region that is more than half of the total volume of the ink containing portion T2001. In addition, when the ink in the ink storage portion T2001 is used up, the movable portion is displaced so as to substantially eliminate the volume of the ink storage portion T2001.

  The container body T2017 is formed of a material such as polypropylene, and the height of the ink tank is H, the depth is D, and the width W is as shown in FIG. On the inner surface of the container main body T2017, a fixed surface T2024 is provided on the surface orthogonal to the side of the smallest dimension among these dimensions. In the case of this example, since the width W is smaller than the height H and the depth D, the fixed surface T2024 is provided on the inner surface orthogonal to the side of the width W. The dimensions of the ink tank are, for example, a height H of 40 mm, a depth D of 60 mm, and a width W of 15 mm. The relationship between these dimensions H, D, and W corresponds to the relationship between the height, depth, and width inside the ink container T2001, and the fixed surface T2024 is the surface on which the smallest head pressure is applied in various postures of the ink tank. is there.

  A concave portion for positioning and holding the spring member T2015 is provided at the center portion of the fixed surface T2024, and a communication path T2012 connected to the ink supply port T2002 is formed from an opening T2013 located in the concave portion. On the outer surface of the container body T2017, a groove portion for forming the communication path T2012 is provided in parallel with the fixed surface T2024 of the container body T2017. The opening of the groove portion is closed by joining the film member T2019, whereby the communication path T2012 is formed in a tubular shape. The film member T2019 is, for example, a film whose material is polypropylene and whose thickness is 0.1 mm.

  Further, a meniscus forming member T2020 is sandwiched and bonded by a presser plate T2021 to an ink supply port T2002 formed on the lower surface portion of the container body T2017. The meniscus forming member T2020 has a meniscus holding force of about 250 to 350 mmAq so that air is not taken in from the supply port T2002 due to a negative pressure of an ink storage portion T2001 described later. The material of the meniscus forming member T2020 is, for example, a SUS304 material suspension mesh filter having a transmission dimension of 15 to 30 μm, a felt-shaped suspension filter, or polypropylene. The material of such a filter may be other than the above.

  In addition, a region for welding the flexible film T2011 is provided as an opening peripheral portion T2015 in the middle of the side surface in the container body T2017 adjacent to the fixed surface T2024. The flexible film T2011 is welded to the opening peripheral edge portion T2015 so that the ink does not leak, and forms the ink containing portion T2001 together with the fixed surface T2017 facing the flexible film T2011. The flexible film T2011 is a film having an inner surface made of a polypropylene material and having a thickness of 0.1 mm, for example.

  A spring member T2005 is provided inside the ink container T2001, and a plate member T2022 that receives the urging force of the spring member T2005 is provided on the inner surface of the flexible film T2011. Due to the urging force of the spring member T2005, the inside of the ink containing portion T2001 is always kept at a negative pressure, and the flexible film T2011 is formed in a convex shape outward from the ink containing portion T2001. The opening T2013 is formed at or near the position on the action center line L (see the drawing) of the urging force of the spring member T2015 on the plate member T2022. The spring member T2005 and the plate member T2022 are made of, for example, SUS304, and the thickness of the plate member T2022 is, for example, 0.1 to 0.2 mm. Further, the negative pressure inside the ink containing portion T2001 is, for example, 100 to 200 mmAq.

  An inclined surface T2025 is formed on the side surface in the ink containing portion T2001 adjacent to the fixed surface T2024. The opening of the container body T2017 is closed by a lid member T2018, and the lid member T2018 is provided with an air communication port T2023 so as not to hinder the movement of the flexible film T2011 that is displaced by negative pressure.

  The flexible film T2011 and the plate member T2022 form a movable portion that protrudes in a convex shape from the ink containing portion T2001. The movable part is surrounded by a protective part T2027 composed of a side wall T2028 of the container main body T2017 and a lid member T2018, and a space allowing displacement of the movable part between the movable part and the protective part T2027. T2026 is formed.

  The ink storage portion T2001 and the communication path T2012 are filled with ink i5000. As described above, the movable portion of the ink containing portion T2001 formed in a convex shape always has a convex shape as shown in FIG. 5B even in the process where the ink i5000 is consumed.

FIG. 6 is a diagram illustrating a state where the ink tank T2000 falls.
As shown in FIG. 6, when the user accidentally drops the ink tank T2000, the ink tank T2000 collides with the floor and receives an impact. Further, the ink tank T2000 may be impacted for some reason. When an impact is applied to the ink tank T2000 as described above, the internal ink i5000 moves as shown in FIGS. 7A to 7C according to the direction in which the impact is applied. T2011 is deformed.

  FIG. 7A is a cross-sectional view when the ink tank T2000 drops in the direction of arrow F substantially parallel to the fixed surface T2024.

  When the ink tank T2000 is dropped as described above, first, the exterior of the ink tank T2000 including the protection unit T2027 receives an impact, and the ink i5000 in the ink storage unit T2001 generates acceleration in the dropping direction (arrow F direction). Starts moving in the direction of the arrow F.

  As described above, the flexible film T2011 is made of, for example, polypropylene having a thickness of 0.1 mm, so that it is flexible and deforms in response to the ink i5000 to be moved instantaneously. Further, the flexible film T2011 protrudes from the fixed surface T2024 in a convex shape to store the ink i5000, and the ink is easily moved by the inclined surface T2025 spreading toward the flexible film side around the fixed surface T2024. Thus, the flexible film T2011 is deformed.

  That is, the ink i5000 moves along the inclined surface T2025 so that the lower part of the flexible film T2011 in FIG. 7 protrudes, generates a pressure G, and acts to expand the volume of the ink containing portion T2001. To do. In order to allow deformation of the flexible film T2011 when the ink moves, a sufficient space T2026 is formed between the periphery of the flexible film T2011 and the protective portion T2027. Therefore, even if it falls in any direction substantially parallel to the fixed surface T2024, it acts similarly.

  As described above, when the ink tank receives an impact such as dropping, the ink i5000 is positively moved in the direction of the flexible film T2011 so that the ink i5000 deforms the flexible film T2011. This acts to expand the volume of the ink containing portion T2001. However, since the amount of ink stored in the ink storage unit T2001 does not change, as a result, the negative pressure in the ink storage unit T2001 is temporarily increased.

  For example, when the ink tank falls in the direction in which the ink supply port T2002 faces downward as shown in FIG. 7, the ink i5002 accommodated in the communication path T2012 leaks from the ink supply port T2002 due to the impact of the drop. Try to. However, as described above, since the negative pressure of the ink containing portion T2001 is increased, the force in the direction of arrow M that tries to draw the ink i5002 in the communication path T2012 into the ink containing portion into T2001 acts on the ink containing portion. Ink leakage from the supply port T2002 is prevented. Further, the meniscus forming member T2020 provided in the ink supply port T2002 has a meniscus holding force higher than the negative pressure in the ink containing portion T2001 that is generated at the time of a drop impact, and takes in air into the ink containing portion T2001. To prevent.

  FIG. 7B is a cross-sectional view in a state where the ink tank T2000 is dropped in the direction of arrow J with the protective portion T2027 facing down.

  As shown in the figure, when the ink tank T2000 falls in the direction of arrow J, the protection portion T2027 receives an impact, and the ink i5000, the plate member T2022, and the spring member T2005 in the ink storage portion T2001 are accelerated in the direction of arrow J. Begins to move. These movements act to apply pressure to the flexible film T2011 to expand the volume of the ink containing portion T2001. The plate member T2022 moves so as to come into contact with the lid member T2018, and the spring member T2005 tries to further protrude the movable portion protruding in a convex shape. However, since the amount of ink stored in the ink storage unit T2001 does not change, the negative pressure in the ink storage unit T2001 temporarily increases, and ink leakage is prevented as in the case of FIG. be able to.

  FIG. 7C is a cross-sectional view in a state where the ink tank T2000 is dropped with the fixed surface T2024 on the lower side.

  As shown in the figure, when the ink tank T2000 falls with the fixed surface T2024 on the lower side, the outer surface of the container body T2017 receives an impact. Then, the ink i5000 inside the plate member T2022, the spring member T2005, and the ink containing portion T2001 tries to move in the direction of the arrow K that is the same as the direction of dropping. However, since the urging force of the spring member T2005 acts in the direction opposite to the falling direction, the plate member T2022 and the ink are made difficult to move and the action of reducing the volume of the ink containing portion T2001 is suppressed. . In addition, when the plate member T2022 moves with a force that is large when dropped and exceeds the urging force of the spring member T2005, the ink i5000 in the ink containing portion T2001 moves along the inclined surface T2025 adjacent to the fixed surface T2024. Moving. Accordingly, the ink i5000 acts to apply pressure to the flexible film T2011 to expand the volume of the ink containing portion T2001.

  Accordingly, even in such a case, the negative pressure in the ink containing portion T2001 temporarily increases, and ink leakage can be prevented as in the case of FIG. 7A described above.

  Thus, by providing the opening T2013 of the communication path T2012 near the center of action of the spring member T2005, when the opening T2013 is dropped down, the volume of the ink containing portion T2001 is reduced. The spring member T2005 suppresses this action. As a result, the inside of the ink containing portion T2001 can be kept at a negative pressure. Further, a fixed surface T2024 is provided on the inner surface orthogonal to the direction of the smallest dimension among the dimensions of height H, depth D, and width W, and an opening T2013 is provided in the center thereof. For this reason, when the ink tank falls with the fixed surface T2024 on the lower side, the water head pressure applied to the opening T2013 is reduced, and ink leakage is less likely to occur. Further, the ink i5000 in the ink containing portion T2001 that cannot move to the fixed surface T2024 side moves in the arrow L direction along the inclined surface T2025, thereby suppressing a decrease in negative pressure in the ink containing portion T2001.

  As described above, when an impact in the direction as shown in FIGS. 7A and 7B is applied to the ink tank, the ink in the ink containing portion instantaneously moves in the direction of the impact, and the ink is stored. This acts to spread a part of the flexible member constituting the part outward. By this action, it is possible to prevent ink leakage by temporarily increasing the negative pressure in the ink containing portion. Further, when an impact in the direction as shown in FIG. 7C is applied to the ink tank, the action of the spring member suppresses a decrease in the negative pressure in the ink containing portion, thereby preventing ink leakage. be able to. Therefore, ink leakage from the ink supply port of the ink tank can be prevented, and a highly reliable ink tank can be provided. In addition, when the ink tank constitutes an ink cartridge together with the recording head, it is possible to prevent ink leakage from the ejection port of the recording head.

  In addition, the negative pressure state that prevents ink leakage in the normal state is maintained except when it is dropped or subjected to some impact, so even if the discharge frequency is increased, printing performance will not be adversely affected. And good printing can be performed.

(Second Embodiment)
8 to 10 are diagrams for explaining the second embodiment of the present invention.
As shown in FIG. 8, the ink tank 2000 of this example is a thin ink tank in which the height H is the smallest among the dimensions of the height H, the depth D, and the width W, and the ink supply port T2002 is shown in the drawing. It is provided in the center of the left lateral surface, and the lower side in the figure is constituted by a container body T2017. Further, the upper side in the figure is constituted by a lid member T2018. The internal configuration of the ink tank 2000 is substantially the same as that of the above-described embodiment, and includes a spring member T2005, a plate member T2022, a flexible film T2011, a meniscus member T2020, and a film member T2019.

  The fixed surface T2024 is provided on a surface orthogonal to the side in the height direction that is the smallest among the dimensions of the height H, the depth D, and the width W. The relationship between the dimensions H, D, and W corresponds to the relationship between the height, depth, and width inside the ink containing portion T2001, as in the above-described embodiment, and the fixed surface T2024 is in various postures of the ink tank. It becomes the surface where the smallest water head pressure is applied. The flexible film T2011 is joined so as to face the fixed surface T2024, thereby forming the ink containing portion T2001. Furthermore, a spring member T2005 and a plate member T2022 are provided inside the ink storage portion T2001, and the ink storage portion 2001 is formed in a convex shape as shown in FIG.

  In addition, the communication path T2012 in this example is formed by closing the opening portion of the groove portion formed on the inner surface of the container body T2017 with the film member T2019. Further, the opening T2013 of the communication path T2012 is provided not near the center of the fixed surface T2024 but in the vicinity of the installation region of the spring member T2005.

  In the ink tank T2000 of this example, the position of the fixed surface T2024 is determined by the dimensional relationship of the height H, the depth D, and the width W, as in the case of the above-described embodiment. Further, the position of the opening T2013 is set not only at the center of action of the spring member T2005, but also at a position close to the installation region of the spring member T2005 as in this example, thereby obtaining the same effect as the above-described embodiment. Can do.

(Third embodiment)
11 and 12 are diagrams for explaining a third embodiment of the present invention.

  In this example, the plate member T2022 is joined to the outside of the flexible film T2011, and the plate member T2022 is urged outward by a plurality of tension springs T2029a, T2029b, T2029c, T2029d, and the ink containing portion T2001 is shown in FIG. It is formed in such a convex shape. One side of the tension springs T2029a to T2029d is fixed to the four corners of the container body T2017 on the lid member side. The action center axis T2030 of these tension springs T2029a to T2029d is located at the center of the fixed surface T2024, and an opening T2013 of the communication path T2012 is provided so as to be close to the action center axis T2030.

  As in this example, when the spring member is provided outside the ink storage portion, the same effects as those of the above-described embodiment can be obtained even when the spring member is not positioned at the center portion of the fixed surface.

(Fourth embodiment)
FIG. 13 is a diagram for explaining a fourth embodiment of the present invention, and for convenience of explanation, a film member T2019 joined to the outer surface of the container body T2017 is shown in a transparent manner.

  In the ink tank T2000 of this example, a flow resistance generator T2031 is configured in a communication path T2012 provided in the container body T2017. The communication path T2012 is configured by a film member 2019 closing an opening portion of a groove portion formed on the outer surface of the container body T2017. For example, the flow resistance generation unit T2031 has a configuration in which the communication path T2012 is refracted a plurality of times, and has a configuration in which a large flow resistance is generated when the flow velocity of the ink i5002 flowing through the communication path T2012 is high. That is, it is difficult to instantaneously move a large amount of ink in the communication path T2012.

  For example, when the ink tank T2000 is accidentally dropped, the negative pressure in the ink containing portion instantaneously changes as described above. At this time, if the ink i5002 in the communication path T2012 moves in a large amount, there is a possibility that air will be drawn in or ink leakage may occur. Therefore, in this example, by adding the flow resistance generator T2031 to the configuration of the first embodiment described above, ink leakage is less likely to occur.

(Other embodiments)
The ink tank of the present invention may constitute an ink jet cartridge together with the recording head.

1 is a perspective view of an ink jet recording apparatus in which an ink tank of the present invention can be mounted. It is a perspective view showing the inside of the main body of the inkjet recording device of FIG. (A) is the perspective view which looked at the ink tank of the 1st Embodiment of this invention from upper direction, (b) is the perspective view which looked at the ink tank from the downward direction. FIG. 4 is an exploded perspective view of the ink tank shown in FIG. 3. FIG. 3A is a cross-sectional view taken along the line V-V in a state where the ink tank shown in FIG. 3B is filled with ink, and FIG. 3B is a cross-sectional view of the ink tank where about half of the ink in the ink tank is used. It is sectional drawing which follows the -V line. It is explanatory drawing of the state which the ink tank shown in FIG. 3 falls. (A) is sectional drawing for demonstrating the state which the ink tank shown in FIG. 6 fell substantially parallel to the fixed surface. (B) is sectional drawing for demonstrating the state which the ink tank fell with the protection part down. (C) is a cross-sectional view for explaining a state in which the ink tank has been dropped with its fixed surface facing down. It is a perspective view for demonstrating the ink tank of the 2nd Embodiment of this invention. FIG. 9 is an exploded perspective view of the ink tank shown in FIG. 8. It is sectional drawing which follows the XX line of the ink tank shown in FIG. It is a perspective view for demonstrating the ink tank of the 3rd Embodiment of this invention. It is sectional drawing which follows the XII-XII line | wire of the ink tank shown in FIG. It is a perspective view for demonstrating the ink tank of the 4th Embodiment of this invention. FIG. 6 is a schematic cross-sectional view of an ink tank constituting a conventional recording head cartridge. It is sectional drawing for demonstrating the other structural example of the conventional ink tank. It is sectional drawing for demonstrating the further another structural example of the conventional ink tank.

Explanation of symbols

T2000 ink tank T2001 ink containing portion T2002 ink supply port T2004 flexible member T2005 spring member T2012 communication path T2013 opening T2020 meniscus forming member T2022 plate member T2031 flow resistance generating portion

Claims (8)

In an ink tank that internally forms an ink containing portion including a flexible member, a biasing member, and a plate member that is pushed into the flexible member by the biasing member,
The ink storage portion is a surface facing the plate member and a first inner wall surface to which an end of the biasing member is connected;
  A second inner wall surface inclined and intersecting the first inner wall surface;
  An opening communicating with an ink supply port provided on an outer wall surface of the ink tank perpendicular to the first inner wall surface;
  The ink tank, wherein the second inner wall surface extends so as to form an obtuse angle on the ink containing portion side by intersecting with the first inner wall surface, and is in contact with the flexible member. . The ink tank according to claim 1 wherein the flexible member is characterized in that it is constituted by the flexible film. Wherein the biasing member includes an ink tank according to claim 1 or 2, characterized in that biasing the plate member to the outside of the ink storage portion. The ink tank includes a lid member that covers the plate member ,
The ink tank according to claim 1, wherein a space allowing deformation of the flexible member is formed between the plate member and the lid member. The ink tank has an ink supply port for supplying ink stored in the ink storage unit, and the ink supply port includes a meniscus forming member for forming a meniscus of ink. the ink tank according to any one of claims 1-4. The ink tank includes a communication path that allows the ink supply port and the opening to communicate with each other, and includes a flow resistance generation unit that applies a flow resistance to the ink inside the communication path . The ink tank according to any one of 5 . The said flow resistance generation | occurrence | production part is formed by the bending part of the said communicating path.
The ink tank according to 6 . The ink tank according to claim 1, wherein the biasing member is a coil spring.

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