Liquid cartridge and method for manufacturing a liquid cartridge

Abstract

A liquid cartridge includes a liquid container provided to store a liquid; a cover member provided to cover the liquid container; a liquid retaining member stored in the liquid container and provided to retain the liquid; and a protruding member connected with the liquid retaining member, wherein the liquid retaining member has a first surface facing the cover member, wherein the cover member includes an atmospheric communication path that communicates an inside of the liquid container and an outside, wherein the atmospheric communication path includes an opening to the inside of the liquid container, and the protruding member protrudes from the first surface toward the cover member and surrounds at least a portion of the opening when viewed from a vertical direction orthogonal to the first surface with which the cover member covers the liquid container. A method for manufacturing a liquid cartridge is also disclosed.

Description

Technical Field

[0001] This invention relates to a liquid container and a method for manufacturing the liquid container. Background Technology

[0002] As a liquid cartridge for storing ink and attached to an inkjet recording device, a liquid cartridge including a negative pressure generating unit is known, which generates negative pressure inside the liquid cartridge. Japanese Patent Application Publication No. 6-191046 describes a liquid cartridge including a liquid holding member made of a porous body, which serves as the negative pressure generating unit. The liquid cartridge discussed in Japanese Patent Application Publication No. 6-191046 includes an atmospheric communication path connecting the interior and exterior of the liquid cartridge to prevent excessive increase in negative pressure inside the liquid cartridge. A space is provided between the liquid holding member and the upper cover of the liquid cartridge.

[0003] When the liquid cartridge is depressurized or exposed to high temperatures outside the cartridge, some ink may leak from the liquid holding member, and the liquid holding member may contain almost no ink (hereinafter, this liquid will be referred to as free liquid). Most of the free liquid remains in the space, but some free liquid may intrude into the atmospheric communication path, thereby blocking the atmospheric communication path. As a result, the cartridge may become hermetically sealed, causing the liquid supply to the liquid discharge device to become unstable, which leads to a deterioration in the recording quality of the liquid discharge device. This problem also applies to cartridges that store liquids different from ink. Summary of the Invention

[0004] Several aspects of the present invention provide a liquid cartridge that is unlikely to cause blockage in atmospheric communication paths.

[0005] According to one aspect of the invention, a liquid container includes: a liquid container configured to store a liquid; a lid member configured to cover the liquid container; a liquid retaining member stored in the liquid container and configured to retain the liquid; and a protruding member connected to the liquid retaining member, wherein the liquid retaining member has a first surface facing the lid member, wherein the lid member includes an atmospheric communication path communicating the interior and exterior of the liquid container, wherein the atmospheric communication path includes an opening leading to the interior of the liquid container, wherein the protruding member protrudes from the first surface toward the lid member and surrounds at least a portion of the opening when viewed from a vertical direction orthogonal to the first surface (where the lid member covers the liquid container).

[0006] Other features of the invention will become apparent from the following description of embodiments with reference to the accompanying drawings.

[0007] Brief description of the attached figures

[0008] Figures 1A to 1DThis is a view schematically illustrating the construction of the liquid cartridge according to the first embodiment. Figure 1A This is a perspective view of the liquid box as seen from the side of the liquid discharge unit. Figure 1B This is a perspective view of the liquid container as seen from the side of the lid component. Figure 1C This is an exploded perspective view showing the liquid container, the recording element substrate, and the electrical wiring components. Figure 1D It is an exploded perspective view showing the liquid container, liquid holding components, and cover components.

[0009] Figure 2 This is a cross-sectional view of the liquid box shown in Figure 1.

[0010] Figure 3A yes Figure 2 A magnified view of part A in the image. Figure 3B It is a plan view of the protruding component and its vicinity.

[0011] Figures 4A to 4C This is a schematic diagram illustrating the liquid distribution in a liquid box based on a comparative example. Figure 4A This indicates the presence of a free liquid state. Figure 4B This indicates the state in which a portion of free liquid may intrude into atmospheric connectivity pathways, and Figure 4C This indicates the state of free liquid blocking atmospheric connectivity.

[0012] Figures 5A to 5C This is a schematic diagram showing the steps of welding the cap component onto the liquid container. Figure 5A The diagram illustrates the steps for aligning the cap component with the liquid container. Figure 5B The illustration shows the steps of lowering the cap component and pressing it against the liquid container. Figure 5C The diagram illustrates the steps of releasing the cover component from the clamp and raising the clamp.

[0013] Figure 6A and 6B This is a schematic diagram illustrating the steps of welding the protruding component to the liquid retaining component. Figure 6A It is a plan view of a liquid holding member with protruding components. Figure 6B It is along Figure 6A The sectional view is taken by line CC.

[0014] Figure 7A and 7B This is a schematic diagram showing the main components of the liquid cartridge according to the second embodiment. Figure 7A This is a magnified view of the atmospheric communication path and protruding members of the liquid box according to the second embodiment, as well as a portion of their vicinity. Figure 7B It is a plan view of the protruding component and its vicinity.

[0015] Figures 8A to 8DThis is a cross-sectional view of the main components of the liquid cartridge according to various variations of the second embodiment.

[0016] Figure 9A and 9B This is a schematic diagram showing the main components of the liquid cartridge according to the third embodiment. Figure 9A This is a magnified view of the atmospheric communication path and protruding members of the liquid box according to the third embodiment, as well as a portion of their vicinity. Figure 9B It is a plan view of the protruding component and its vicinity. Detailed Implementation

[0017] Some embodiments of the present invention will be described below. Figure 1A This is a perspective view of the liquid box 1 according to the first embodiment, viewed from the side of the liquid discharge unit 4. Figure 1B This is a perspective view of the liquid box 1 as seen from the side of the cover component 3. Figure 1C This is an exploded perspective view showing the liquid container 2, the recording element substrate 5, and the electrical wiring component 6. Figure 1D This is an exploded perspective view showing the liquid container 2, the liquid holding component 7, and the cover component 3. Figure 2 It is liquid box 1 along Figure 1B The side section view taken from line AA in the figure. Figure 3A yes Figure 2 Enlarged view of part A in the image (along the...) Figure 3B (The sectional view taken by line BB in the middle), Figure 3B This is a plan view of the protruding member 11 and its vicinity. See below for appropriate reference. Figures 1A to 3B The following explanation is provided. The direction in which the cover member 3 covers the liquid container 2 will be referred to as the Z direction. The Z direction is substantially aligned with the vertical direction. When the liquid cartridge 1 is attached to the main body of the liquid discharging device, the Z direction is aligned with the direction orthogonal to the first surface S1 of the liquid holding member 7. The direction of the long side of the liquid holding member 7 will be referred to as the X direction, and the direction of the short side of the liquid holding member 7 will be referred to as the Y direction. The X direction is aligned with the direction of vibration generated when the cover member 3 is vibrated and welded to the liquid holding member 7. The X, Y, and Z directions are orthogonal to each other. In the following description, the terms "upper side" and "lower side" are defined in the state where the liquid cartridge 1 is attached to the main body of the liquid discharging device. The liquid cartridge 1 that has run out of liquid is replaced by a new liquid cartridge 1. The liquid cartridge 1 is integral with the recording element substrate 5, but it can also be separated from the recording element substrate 5. The liquid cartridge 1 can be a fill-type liquid cartridge. In the following embodiment, liquid refers to ink. However, the liquid is not limited to ink, but can be any liquid that can be discharged from the liquid discharging device.

[0018] Overall Structure

[0019] The liquid container 1 includes: a liquid container 2 that holds liquid; a cover member 3 disposed on the liquid container 2 to cover it; and a liquid discharge unit 4 disposed below the liquid container 2 on the side opposite to the cover member 3. When viewed from the Z-direction, the liquid discharge unit 4 is positioned off-center relative to the center of the liquid container 2. The liquid container 1 is mounted on a movable carriage (not shown) and performs a recording operation during movement. The liquid container 2 and the cover member 3 are manufactured using resin by injection molding. The internal space of the liquid container 2 is substantially cuboid in shape and has an opening facing the cover member 3. The liquid container 2 stores and holds the liquid using a liquid holding member 7.

[0020] The liquid discharge unit 4 includes a recording element substrate 5. The recording element substrate 5 includes an energy generating element (not shown) that applies discharge energy to the liquid. The energy generating element includes an electrothermal converter (heater). However, the energy generating element can be any type of element, such as a piezoelectric element, as long as it is capable of applying discharge energy to the liquid.

[0021] Liquid stored in liquid container 2 is supplied to liquid discharge unit 4 through liquid supply port 10 at the lower part of liquid container 2, and discharged from energy generating element of recording element substrate 5 onto recording medium. Electrical wiring component 6 is attached to liquid container 2. Electrical wiring component 6 includes conductors (not shown) for transmitting power or control signals to recording element substrate 5 and is electrically connected to recording element substrate 5.

[0022] Liquid holding component 7

[0023] A liquid holding member 7 is arranged in the internal space of the liquid container 2 to absorb and retain liquid L1 under negative pressure. The liquid holding member 7 is made of a porous body. The liquid holding member 7 is basically cuboid in shape and occupies most of the internal space of the liquid container 2. The liquid holding member 7 has a first surface S1 that faces the cover member 3 and is almost planar.

[0024] Cover component 3

[0025] The cover component 3 is generally flat. The cover component 3 has a second surface S2 facing the liquid holding member 7 and is almost planar. The cover component 3 has a protruding portion 12 extending from the second surface S2 toward the liquid holding member 7. The protruding portion 12 has a truncated cone shape, with its cross-sectional area decreasing towards the front end portion 12A. The protruding portion 12 is provided with an atmospheric communication path 13, which is concentric with the protruding portion 12 and connects the interior and exterior of the liquid container 2. The atmospheric communication path 13 has a first opening 13A leading to the interior of the liquid container 2 and a second opening 13B leading to the atmosphere. The first opening 13A of the atmospheric communication path 13 is separated from the first surface S1 of the liquid holding member 7. An air-filled space portion 15 is formed between the first surface S1 of the liquid holding member 7 and the second surface S2 of the cover component 3. The cover component 3 has a plurality of ribs 9 protruding from the second surface S2 to abut or press against the liquid holding member 7. Therefore, the liquid holding member 7 is stably held within the liquid container 2. When viewed from the Z direction, each rib 9 has a shape composed of lines extending in at least two directions, such as a T-shape, a V-shape, or an L-shape.

[0026] Protruding component 11

[0027] The liquid container 1 includes a protruding member 11 connected to the liquid holding member 7. When viewed from the Z direction, the protruding member 11 is located almost at the center of the liquid holding member 7, at a different position from the liquid supply port 10. The protruding member 11 is fixed to the liquid holding member 7 and protrudes upward from the first surface S1 toward the cover member 3 along the Z direction. Like the liquid holding member 7, the protruding member 11 is made of a porous body.

[0028] Ideally, the liquid holding member 7 has a melting point similar to that of the protrusion member 11 (within a predetermined range). More ideally, the protrusion member 11 is made of the same material as the liquid holding member 7. An annular weld portion 14 is provided on the outer periphery of the protrusion member 11 and contacts the liquid holding member 7 to weld the protrusion member 11 to the liquid holding member 7. The protrusion member 11 can be integrally molded with the liquid holding member 7. However, in terms of cost, including manufacturing and logistics costs, it is desirable for the protrusion member 11 to be a separate component from the liquid holding member 7. The protrusion member 11 is a circular tube concentric with the first opening 13A and the atmospheric communication path 13. That is, when viewed from the Z direction, the protrusion member 11 has an annular shape surrounding the entire periphery of the first opening 13A of the atmospheric communication path 13. Alternatively, when viewed from the Z direction, the protrusion member 11 can have a polygonal shape. When viewed from the Z-direction, the distance between the protruding member 11 and the first opening 13A of the atmospheric communication path 13 is shorter than the distance between the center of each of the plurality of ribs 9 and the center of the first opening 13A. That is, when viewed from the Z-direction, the distance between any location on the protruding member 11 and the center of the first opening 13A is shorter than the distance between any location on any rib 9 and the center of the first opening 13A. Along the Z-direction, the front end portion 11A of the protruding member 11 is located between the first surface S1 and the second surface S2, and between the second surface S2 and the front end portion 12A of the protruding portion 12.

[0029] Figures 4A to 4C This is a view illustrating a problem with the liquid container 101 according to the comparative example. The liquid container 101 according to the comparative example has a similar construction to the liquid container 1 in the first embodiment, except that it lacks the protruding member 11. When the cover member 3 is vibratory welded to the liquid container 2 as described below, the ribs 9 of the cover member 3 press against the liquid retaining member 7, thus potentially deforming the liquid retaining member 7 to create free liquid L2, as... Figure 4A As shown. If the internal pressure of liquid container 2 fluctuates under this condition due to changes in external pressure, as... Figure 4B As shown, an airflow is generated towards the first opening 13A of the atmospheric communication path 13, which may allow a portion of the free liquid L2 to intrude into the atmospheric communication path 13. There is also a possibility that the free liquid L2 may flow to a position directly below the first opening 13A and may disperse due to vibrations generated in the liquid box 101 when the carriage moves. The dispersed free liquid L2 may then intrude into the atmospheric communication path 13. Figure 4C As shown, the free liquid L2 that has entered the atmospheric communication path 13 will block the atmospheric communication path 13, thereby making the internal space of the liquid container 2 airtight. Therefore, the liquid cannot be stably supplied to the liquid discharge unit 4.

[0030] Figure 3A and 3B This illustrates the state in which the protruding member 11 captures the flowing free liquid L2. The protruding member 11 prevents the free liquid L2 from intruding into the atmospheric communication path 13, thereby likely ensuring the connectivity of the atmospheric communication path 13. Therefore, the liquid is stably supplied to the liquid discharge unit 4, maintaining high-quality recording. Specifically, the front end portion 11A of the protruding member 11 is located between the second surface S2 and the front end portion 12A of the protrusion 12, which reduces the amount of free liquid L2 flowing from the outside of the protruding member 11 through the front end portion 11A and intruding into the interior of the protruding member 11. Therefore, it is possible to effectively prevent free liquid L2 from intruding into the atmospheric communication path 13. Since the liquid is unlikely to leak from the second opening 13B of the atmospheric communication path 13, the productivity of the liquid cartridge 1 can be improved in the manufacturing process, thereby reducing the cost of the liquid cartridge 1. In this invention, the front end portion 11A of the protruding member 11 does not necessarily have to be located between the second surface S2 and the front end portion 12A of the protrusion 12. In an extreme example, the protrusion 12 may not be provided.

[0031] Ideally, the distance h2 along the Z direction between the front end portion 11A of the protruding member 11 and the front end portion 12A of the protruding portion 12 is more than 2 / 5 and less than 4 / 5 of the total length h1 of the protruding portion 12. For example, if the total length h1 of the protruding portion 12 is 1.5 mm, then ideally the distance h2 is more than 0.6 mm and less than 1.2 mm. Since h2 ≤ (4 / 5) × h1, a gap G is maintained between the front end portion 11A of the protruding member 11 and the second surface S2, so that when the cover member 3 is vibrated during welding, the protruding member 11 is unlikely to contact the second surface S2 of the cover member 3. This reduces the possibility that the cover member 3 will press the protruding member 11 into the liquid holding member 7 and generate free liquid L2 inside the protruding member 11. In addition, this also reduces the possibility that the protruding member 11 will separate from the first surface S1 of the liquid holding member 7 and shift due to the impact of the vibrated welding of the cover member 3. As described above, although the front end portion 11A of the protruding member 11 is located between the second surface S2 and the front end portion 12A of the protruding portion 12 (h2>0), it is also desirable to satisfy h2≥(2 / 5)×h1. This further reduces the possibility of the dispersed free liquid L2 flowing through the front end portion 11A of the protruding member 11 and intruding into the protruding member 11, thus more effectively preventing the free liquid L2 from intruding into the atmospheric communication path 13.

[0032] When viewed from the Z direction, the protruding member 11 surrounds the entire periphery of the first opening 13A. Therefore, as Figure 3BAs shown, even when free liquid L2 collides with the protruding member 11 from any direction, the protruding member 11 is able to capture and absorb the free liquid L2. Because the protruding member 11 is formed of a porous structure, it effectively absorbs and retains the dispersed free liquid L2. This more effectively prevents the free liquid L2 from flowing through the protruding member 11 and intruding into the atmospheric communication path 13.

[0033] The inner periphery of the protruding member 11 is separated from the outer periphery of the front end portion 12A of the protruding portion 12 by a predetermined distance w. Ideally, this predetermined distance w is more than 1.2 times the amplitude of the vibration welding of the cover member 3 to the liquid container 2, and ideally equal to or shorter than the total length h1 of the protruding portion 12. If the protruding member 11 is too far from the first opening 13A, the protruding member 11 is unlikely to capture the dispersed free liquid L2. If the protruding member 11 is too close to the first opening 13A, there is a possibility that the protruding portion 12 will come into contact with the protruding member 11 during the vibration welding of the cover member 3, thereby causing the protruding member 11 to be pressed into the liquid holding member 7 due to the impact of the contact, and free liquid L2 will be generated inside the protruding member 11. For example, if the amplitude in the X direction is 0.8 mm during vibration welding and the total length h1 of the protruding portion 12 is 1.5 mm, the distance w is preferably more than about 1.0 mm and less than 1.5 mm.

[0034] Method for manufacturing liquid box 1

[0035] Figures 5A to 5C This is a schematic diagram illustrating the process of welding the cover component 3 to the liquid container 2. Figure 1C The recording element substrate 5 and electrical wiring member 6 shown are attached to the liquid container 2, and then the liquid holding member 7 is stored in the liquid container 2. Next, a protruding member 11 is attached to the liquid holding member 7, the liquid container 2 is filled with liquid, and the liquid holding member 7 is impregnated with liquid to retain the liquid therein. Then, the cover member 3 is welded to the liquid container 2 filled with liquid. Specifically, as shown... Figure 5A As shown, the cap component 3 held by clamp 22 is aligned with the liquid container 2 held by clamp 21, and the cap component 3 is lowered and pressed against the liquid container 2, as shown. Figure 5B As shown. In this state, the cover component 3 vibrates along the X direction, and the cover component 3 and the liquid container 2 are welded together through their respective contact surfaces. Afterwards, the cover component 3 is released from the clamp 22, and the clamp 22 rises, as shown. Figure 5C As shown.

[0036] Figure 6A and 6B This is a schematic diagram illustrating the process of welding the protruding member 11 to the liquid retaining member 7. Figure 6AThis is a plan view of the liquid holding member 7, on which the protruding member 11 is arranged. Figure 6B It is along Figure 6A The cross-sectional view shown is taken by line CC. The protruding member 11 is precisely positioned on the first surface S1 of the liquid holding member 7 relative to a predetermined reference position 23 within the liquid container 2. The protruding member 11 is attached to the first surface S1 of the liquid holding member 7 so as to protrude upwards (towards the cover member 3). Next, while the protruding member 11 is held on the first surface S1, a hot welding head 24 is used to press and heat the weld portion 14 of the protruding member 11. When the weld portion 14 is heated by the hot welding head 24, the weld portion 14 melts. Therefore, the first surface S1 of the liquid holding member 7 melts, and then the protruding member 11 is joined to the liquid holding member 7. In particular, if the melting point of the protruding member 11 is set to be similar to the melting point of the liquid holding member 7, both components melt simultaneously, thereby improving the reliability of the weld.

[0037] Figure 7A This is a partial enlarged view of the liquid container 1 according to the second embodiment. Figure 7B This is a plan view of the protruding member 11 and its vicinity, which respectively correspond to Figure 3A and 3B Viewed from the Z direction, the protruding member 11 has an open shape with two ends 16A and 16B, and surrounds only a portion of the first opening 13A. The protruding member 11 is part of a circular tube concentric with the first opening 13A, and the inner periphery of the protruding member 11 is separated from the outer periphery of the front end portion 12A of the protrusion 12 by a predetermined distance W, as in the first embodiment (see FIG. 3). Ideally, this predetermined distance W is 1.2 times the amplitude of the vibration welding of the cover member 3 to the liquid container 2, and preferably equal to or shorter than the total length of the protrusion 12. Viewed from the Z direction, the protruding member 11 is substantially semi-circular. Alternatively, the protruding member 11 may be polygonal. As in the first embodiment, when viewed from the Z direction, the liquid supply port 10 is eccentric relative to the center of the liquid container 2, and the first opening 13A of the atmospheric communication path 13 is located at a different position than the liquid supply port 10 (see FIG. 3). Figure 2 To stably supply liquid from the liquid supply port 10 to the liquid discharge unit 4, a large amount of liquid can be injected into the upper portion (liquid supply port 10) of the liquid discharge unit 4. In this case, free liquid L2 may appear on the side where the liquid discharge unit 4 is located. In this embodiment, if the portion where free liquid L2 may appear can be predicted in advance, the protruding member 11 is only provided between this portion and the first opening 13A of the atmospheric communication path 13. The protruding member 11 is preferably provided at least between the first opening 13A and the liquid discharge unit 4. According to the second embodiment, the amount of material used in the protruding member 11 can be suppressed, thereby reducing costs.

[0038] Figures 8A to 8D This illustrates a variation of this embodiment. Figures 8A to 8D It is similar to Figure 7B The plan view is shown, but the welded portion 14 is not shown. When viewed from the Z direction, the protruding member 11 may have a shape formed by three rectangular sides, such as... Figure 8A As shown, or it can have a V-shaped shape, such as Figure 8B As shown. That is, the protruding member 11 can have a shape formed by a combination of multiple straight lines. When viewed from the Z direction, the protruding member 11 can have a C-shape (an arcuate shape covering more than 1 / 2 and less than 3 / 4 of the entire perimeter of the first opening 13A of the atmospheric communication path 13), such as Figure 8C As shown. That is to say, the protruding member 11 can have a shape formed by any curve.

[0039] Although not shown, the protruding member 11 may have a shape formed by a combination of at least one curve and at least one straight line. In these variations, the protruding member 11 is only disposed between the portion where free liquid L2 is likely to occur and the first opening 13A of the atmospheric communication path 13. Figure 8D As shown, the protruding member 11 can have a shape formed by a straight line. In this case, the protruding member 11 is only disposed between the portion where free liquid L2 may appear and the first opening 13A of the atmospheric communication path 13, and is preferably arranged particularly parallel to the flow direction of free liquid L2. Also according to these variations, the amount of material used for the protruding member 11 can be reduced, thereby reducing costs. It can be understood from the first and second embodiments that, when viewed from the Z direction, the protruding member 11 surrounds at least a portion of the opening.

[0040] Figure 9A This is a partial enlarged view of the liquid container 1 according to the third embodiment. Figure 9B This is a plan view of the protruding member 11 and its vicinity, which respectively correspond to Figure 3A and 3B Viewed from the Z direction, multiple protruding members 11C and 11B are concentrically arranged around the first opening 13A. According to this configuration, even when free liquid L2 flows past the outer protruding member 11C and intrudes into the inner side of the outer protruding member 11C, the inner protruding member 11B blocks the free liquid L2, thereby more effectively preventing free liquid L2 from intruding into the atmospheric communication path 13. A welded portion 14 is located between the outer protruding member 11C and the inner protruding member 11B, and is integral with both. Therefore, the shapes of the protruding members 11C and 11B can be stabilized, and the protruding members 11C and 11B can be attached to the liquid-holding member 7 by a single welding process.

[0041] According to the present invention, it is possible to provide a liquid cartridge that is unlikely to cause blockage of atmospheric communication paths.

[0042] Although the invention has been described with reference to embodiments, it should be understood that the invention is not limited to the disclosed embodiments. The scope of the following claims should be accorded the broadest interpretation in order to cover all such variations and equivalent structures and functions.

Claims

1. A liquid container, comprising: A liquid container configured to store liquid; A cover component, the cover component being configured to cover the liquid container; A liquid holding member, which is stored in the liquid container and configured to hold the liquid; as well as A protruding member, which is connected to the liquid-holding member. The liquid-retaining member has a first surface facing the cover component. The cover component includes an atmospheric communication path connecting the interior and exterior of the liquid container. The atmospheric communication path includes an opening leading to the interior of the liquid container, and The protruding member protrudes from the first surface toward the cover member and surrounds at least a portion of the opening when viewed from a vertical direction orthogonal to the first surface of the cover member covering the liquid container; The cover component has a second surface facing the liquid holding member, and the front end portion of the protruding member is located between the first surface and the second surface. The cover component includes a protruding portion that includes the atmospheric communication path and protrudes from the second surface toward the liquid holding member. The front end of the protruding member is located between the second surface and the front end of the protruding portion. The vertical distance between the front end of the protruding member and the front end of the protruding portion is more than 2 / 5 and less than 4 / 5 of the length of the protruding portion from the second surface to the front end of the protruding portion.

2. The liquid container according to claim 1, wherein: The cover component includes multiple ribs that protrude from the second surface and are in contact with the liquid retaining member, and Specifically, when viewed from the vertical direction, the distance between the protruding member and the opening is shorter than the distance between each of the plurality of ribs and the opening.

3. The liquid container according to claim 1, wherein: When viewed vertically, the protruding member surrounds the periphery of the opening.

4. The liquid container according to claim 3, wherein: The protruding member is a circular tube concentric with the opening. The inner periphery of the protruding member is spaced apart from the outer periphery of the front end portion of the protruding part by a predetermined distance, and The predetermined distance is 1.2 times the amplitude of the vibration welding of the cover component to the liquid container, and is equal to or less than the length of the protrusion from the second surface to the front end of the protrusion in the vertical direction.

5. The liquid container according to claim 1, further comprising: A liquid supply port is provided on the surface of the liquid container opposite to the cap component. Specifically, when viewed vertically, the opening of the atmospheric communication path is located at a different position than the liquid supply port. Specifically, when viewed vertically, the protruding member is arranged between the opening of the atmospheric communication path and the liquid supply port, and The protruding member includes two end portions and, when viewed from the vertical direction, only surrounds a portion of the periphery of the opening.

6. The liquid container according to claim 5, wherein: The protruding member is part of a circular tube concentric with the opening.

7. The liquid cartridge according to claim 6, wherein: in, The inner periphery of the protruding member is spaced apart from the outer periphery of the front end portion of the protruding part by a predetermined distance, and The predetermined distance is 1.2 times the amplitude of the vibration welding of the cover component to the liquid container, and is equal to or less than the length of the protrusion from the second surface to the front end of the protrusion in the vertical direction.

8. The liquid cartridge according to claim 5, wherein: The protruding member has a shape formed by a curve, multiple straight lines, or a combination of at least one curve and at least one straight line.

9. The liquid container according to claim 1, wherein: The protruding component includes multiple protruding components, and The plurality of protruding members are arranged concentrically around the opening.

10. The liquid container according to claim 1, wherein: Both the liquid-holding component and the protrusion component are made of porous material.

11. The liquid cartridge according to claim 10, wherein: The liquid holding member and the protruding member have melting points within a predetermined range.

12. The liquid container according to claim 1, wherein: The protruding member is welded to the liquid-holding member.

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