Flow path unit and liquid ejecting apparatus

Abstract

The present application provides a flow channel unit and a liquid ejection device with improved convenience. A flow channel unit (17) is a flow channel unit for a liquid supplied to a head that ejects a liquid in a flow direction, and includes a flow channel member (21) having a flow channel (24), and a filter portion (22) configured to be detachable with respect to the flow channel member, the flow channel member having an opening (28) that communicates with the flow channel and to which the filter portion is attached, the filter portion having a filter (32) that filters the liquid flowing from the flow channel, and a holding member (31) that holds the filter.

Description

TECHNICAL FIELD

[0001] The present application relates to a flow path unit and a liquid ejection apparatus. BACKGROUND

[0002] In Patent Literature 1, as one example of a liquid ejection apparatus, a liquid ejection apparatus is described which has a filter unit through which a liquid supplied to a head that ejects the liquid flows. The filter unit is one example of a flow path unit. The filter unit has a filter that filters the liquid. The filter unit supplies the liquid filtered by the filter to the head.

[0003] In a flow path unit like this, the filter deteriorates along with the filtering. Therefore, there is a need to replace the filter. In the liquid ejection apparatus described in Patent Literature 1, the filter needs to be replaced together with the flow path unit in order to replace the filter. Therefore, there is room for improvement in the convenience of use of the flow path unit.

[0004] Patent Literature 1: Japanese Patent Application Publication No. 2020-100051 SUMMARY

[0005] A flow path unit that solves the above problem is a flow path unit through which a liquid supplied to a head that ejects the liquid flows, and has: a flow path member that has a flow path; and a filter portion that is configured to be detachable with respect to the flow path member, the flow path member having an opening that communicates with the flow path and on which the filter portion is mounted, the filter portion having: a filter that filters the liquid that flows from the flow path; and a holding member that holds the filter.

[0006] A liquid ejection apparatus that solves the above problem has: a head that ejects a liquid; and a flow path unit through which a liquid supplied to the head flows, the flow path unit having: a flow path member that has a flow path; and a filter portion that is configured to be detachable with respect to the flow path member, the flow path member having an opening that communicates with the flow path and on which the filter portion is mounted, the filter portion having: a filter that filters the liquid that flows from the flow path; and a holding member that holds the filter. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 is a schematic view of one embodiment of a liquid ejection apparatus having a flow path unit.

[0008] Figure 2 is a cross-sectional view of a flow path unit.

[0009] Figure 3 is a cross-sectional view of a flow path unit in Figure 2A cross-sectional view of the flow path unit in which cutting is performed at different positions.

[0010] Figure 4 A front view of the flow path unit as viewed from the front of the opening.

[0011] Figure 5 A cross-sectional view of the flow path unit as viewed from Figure 2 the state shown.

[0012] Figure 6 A schematic view showing a modification of the liquid ejection apparatus.

[0013] Figure 7 A schematic view showing a modification of the flow path unit.

[0014] Figure 8 A cross-sectional view showing a modification of the filter portion.

[0015] Figure 9 A cross-sectional view of the flow path unit showing another modification different from Figure 7 .

[0016] Figure 10 A cross-sectional view of the flow path unit as viewed from Figure 9 the state shown. DETAILED DESCRIPTION

[0017] Hereinafter, one embodiment of a liquid ejection apparatus provided with a flow path unit will be described with reference to the drawings. The liquid ejection apparatus is, for example, an inkjet printer that records an image such as a letter or a photograph on a medium such as paper or cloth by ejecting ink, which is one example of a liquid, toward the medium.

[0018] As shown in FIG. 1, the liquid ejection apparatus 11 is provided with a head 12, a storage portion 13, and a supply flow path 14. Figure 1 The head 12 is configured to eject a liquid. The head 12 has one or a plurality of nozzles 16. The head 12 records an image on a medium 99 by ejecting a liquid from the nozzles 16 toward the medium 99.

[0019] The storage portion 13 is configured to store a liquid supplied to the head 12. The storage portion 13 is, for example, an ink tank or a cartridge.

[0020] The supply flow path 14 is connected to the head 12 and the storage portion 13. A liquid flows from the storage portion 13 toward the head 12 via the supply flow path 14.

[0021]

[0022] ​The supply channel 14 includes a channel unit 17. That is, the liquid ejection device 11 includes a channel unit 17. In this example, the supply channel 14 includes, in addition to the channel unit 17, a first supply channel 18 and a second supply channel 19. The first supply channel 18 is connected to the receiving part 13 and the channel unit 17. The second supply channel 19 is connected to the channel unit 17 and the head 12.

[0023] In this example, the flow channel unit 17 is indirectly connected to the receiving section 13 via the first supply flow channel 18. In this example, the flow channel unit 17 is indirectly connected to the head 12 via the second supply flow channel 19. The flow channel unit 17 may also be directly connected to the receiving section 13 or directly connected to the head 12. The position of the flow channel unit 17 in the supply flow channel 14 is not limited.

[0024] like Figure 2 , Figure 3 , Figure 4 as well as Figure 5 As shown, the flow channel unit 17 has a flow channel component 21 and a filter section 22 mounted on the flow channel component 21. The flow channel unit 17 is a unit for supplying liquid supplied from the receiving section 13 to the head 12.

[0025] The flow channel component 21 has a flow channel 24. The flow channel 24 is connected, for example, to a first supply flow channel 18 and a second supply flow channel 19. The flow channel 24 includes a first flow channel 25, a second flow channel 26, and a filter flow channel 27.

[0026] The first flow channel 25 is connected, for example, to the first supply flow channel 18. The second flow channel 26 is connected, for example, to the second supply flow channel 19. The filter flow channel 27 is connected to the first flow channel 25 and the second flow channel 26. Therefore, the liquid flowing through the flow channel 24 will flow in the order of the first flow channel 25, the filter flow channel 27, and the second flow channel 26. The filter flow channel 27 also serves as a space for housing the filter section 22 mounted on the flow channel component 21. Therefore, the liquid flowing through the flow channel 24 will pass through the filter section 22.

[0027] An opening 28 is provided on the flow channel component 21. The opening 28 communicates with the inside of the flow channel component 21 and the outside of the flow channel component 21. The opening 28 communicates with the flow channel 24. Specifically, the opening 28 communicates with the filter flow channel 27.

[0028] A filter section 22 is installed at the opening 28. Therefore, the filter section 22 passes through the opening 28 when it is being installed or removed from the flow channel component 21. The opening 28 and the filter flow channel 27 function as a mounting part on which the filter section 22 is installed. The filter section 22 is installed by being inserted into the opening 28 and the filter flow channel 27.

[0029] The filter portion 22 is configured to be detachable, i.e., replaceable, with respect to the flow passage member 21. The filter portion 22 has a holding member 31 and a filter 32. The holding member 31 holds the filter 32. The holding member 31 has, for example, a holding portion 33 and a handle portion 34. The holding portion 33 is a portion that comes into contact with the filter 32. In a state where the filter portion 22 is attached to the flow passage member 21, the holding portion 33 is located at the filter flow passage 27. The holding portion 33 extends from the handle portion 34. The handle portion 34 is a portion that is held when the filter portion 22 is detached. In the present example, the handle portion 34 has a notch 35. When a user hooks a fingernail on the notch 35, the filter portion 22 is easily detached from the flow passage member 21.

[0030] The filter 32 is, for example, a mesh filter made of metal. In a state where the filter portion 22 is attached to the flow passage member 21, the filter 32 is located at the filter flow passage 27. In a state where the filter portion 22 is attached to the flow passage member 21, the holding portion 33 and the filter 32 are positioned in a manner that blocks the filter flow passage 27. Therefore, liquid that flows through the filter flow passage 27 passes through the filter 32. Thus, foreign matter is removed from the liquid. In this way, the filter 32 filters liquid that flows through the flow passage 24.

[0031] In the present example, the filter 32 is fused with respect to the holding member 31. Therefore, in the present example, the filter 32 is replaced by replacing the filter portion 22. The filter 32 can also be configured to be detachable with respect to the holding member 31. In this case, the filter 32 can be replaced independently. For example, in a case where the filter portion 22 is detached, the holding member 31 can be reused by replacing the filter 32.

[0032] The flow passage unit 17 can also have an elastic member 36 that has elasticity. The elastic member 36 is, for example, made of rubber, an elastomer, or the like. The elastic member 36 is located between the flow passage member 21 and the filter portion 22. The elastic member 36 is elastically deformed by being sandwiched by the filter portion 22 and the flow passage member 21 in a state where the filter portion 22 is attached to the flow passage member 21. The elastic member 36 is, for example, sandwiched by the flow passage member 21 and the handle portion 34. Thus, the elastic member 36 seals a gap between the flow passage member 21 and the filter portion 22. Therefore, in a state where the filter portion 22 is attached to the flow passage member 21, the possibility of liquid that flows through the flow passage 24 leaking from the opening 28 is reduced.

[0033] The elastic member 36 can also be configured to be detachable from the flow passage member 21. In the present example, the elastic member 36 is fixed to the filter portion 22. Therefore, by detaching the filter portion 22 from the flow passage member 21, the elastic member 36 is detached from the flow passage member 21. In the present example, the elastic member 36 is replaced along with the case where the filter portion 22 is replaced. The elastic member 36 is provided, for example, in a ring shape, and is disposed so as to surround the base end of the holding portion 33. The base end of the holding portion 33 refers to the end portion of the holding portion 33 that is connected to the handle portion 34.

[0034] The elastic member 36 can also be configured to be detachable with respect to the filter portion 22. In this case, the elastic member 36 can be replaced individually. The elastic member 36 can also be configured to be detachable with respect to the flow passage member 21, rather than with respect to the filter portion 22. In this case, the elastic member 36 can also be replaced individually.

[0035] The flow passage unit 17 can also have a stopper 37 that presses the filter portion 22 mounted on the flow passage member 21. By the stopper 37, the possibility that the filter portion 22 is inadvertently detached from the flow passage member 21 is reduced. In the present example, a force is applied to the filter portion 22 in the direction of detachment from the flow passage member 21 by the elasticity of the elastic member 36. Therefore, the effect of the stopper 37 pressing the filter portion 22 is large.

[0036] The stopper 37 includes, for example, a pin 38 and a pin fixing member 39. The pin 38 presses the filter portion 22, for example, by being in contact with the handle portion 34. The pin fixing member 39 is a portion on which the pin 38 is mounted. By mounting the pin 38 on the pin fixing member 39, the pin 38 presses the filter portion 22. The pin fixing member 39 is provided on the flow passage member 21. In the present example, two pin fixing members 39 are provided. The two pin fixing members 39 are positioned, for example, so as to sandwich the opening 28 when the opening 28 is viewed from the front. By mounting one pin 38 on the two pin fixing members 39, the stopper 37 functions.

[0037] In the case where the filter portion 22 is replaced, if liquid remains in the flow passage 24, there is a possibility that the liquid leaks from the opening 28. Therefore, in the case where the filter portion 22 is replaced, the liquid can also be drained from the flow passage 24. For example, the liquid can be drained from the flow passage 24 by draining the liquid from the nozzle 16. By replacing the filter portion 22 in a state where the flow passage 24 is empty, the possibility that the liquid leaks from the opening 28 is reduced.

[0038] As Figure 1As shown, the liquid dispensing device 11 may also include a valve to open or close the supply channel 14. In this example, the liquid dispensing device 11 is provided as a valve, for example, with a first valve 41 and a second valve 42. The first valve 41 is located, for example, at the first supply channel 18. The second valve 42 is located, for example, at the second supply channel 19.

[0039] The liquid dispensing device 11 may also include a pump 43. The pump 43 is located, for example, at the second supply channel 19. In this case, the pump 43 is configured between the second valve 42 and the head 12. The pump 43 delivers liquid from the receiving section 13 toward the head 12. The pump 43 can be, for example, a tubular pump, a syringe pump, or a diaphragm pump.

[0040] In this example, when pump 43 is driven with the first valve 41 and the second valve 42 open, liquid is transported from the receiving section 13 to the head 12. For example, when pump 43 is driven with the first valve 41 closed and the second valve 42 open, liquid is transported from the flow channel unit 17 to the head 12. This allows the flow channel unit 17 to be emptied. For example, when the flow channel unit 17 is empty and the first valve 41 and the second valve 42 are closed, the filter section 22 can be replaced. This reduces the possibility of liquid leaking from the opening 28 during filter section 22 replacement.

[0041] Next, the function and effects of the above-described implementation methods will be explained.

[0042] (1) The flow channel component 21 communicates with the flow channel 24 and has an opening 28 on which the filter section 22 is installed.

[0043] According to the above structure, the filter section 22 can be removed from the flow channel unit 17 via the opening 28, and a new filter 32 can be replaced. That is, when replacing the filter 32, the ease of use of the flow channel unit 17 is improved compared to replacing it together with the flow channel unit 17.

[0044] (2) The flow channel unit 17 has an elastic member 36 between the flow channel component 21 and the filter section 22, and the elastic member 36 is elastic.

[0045] According to the above structure, the elastic member 36 reduces the possibility of liquid leaking out of the flow channel 24 through the opening 28.

[0046] (3) The elastic member 36 is configured to be detachable from the flow channel member 21.

[0047] Based on the above structure, the elastic component 36 can be replaced.

[0048] (4) The elastic component 36 is fixed to the filter section 22.

[0049] According to the above structure, the elastic member 36 can be replaced along with the replacement of the filter section 22.

[0050] (5) The flow channel unit 17 has a stop 37, which presses the filter section 22 installed on the flow channel component 21.

[0051] According to the above structure, it is possible to prevent the filter section 22 from accidentally falling off the flow channel component 21.

[0052] This embodiment can be modified and implemented in the following ways. This embodiment and the following modifications can be combined and implemented within the scope of technical non-contradiction.

[0053] like Figure 6 As shown, the liquid dispensing device 11 may also include a sub-receiving section 45, a first sub-flow channel 46, and a second sub-flow channel 47. The sub-receiving section 45 collects the liquid after it has passed through the flow channel unit 17. The first sub-flow channel 46 is connected to the sub-receiving section 45 and the second supply flow channel 19. The second sub-flow channel 47 is connected to the sub-receiving section 45 and the second supply flow channel 19. The liquid flows from the flow channel unit 17 to the sub-receiving section 45 via the first sub-flow channel 46. The liquid flows from the sub-receiving section 45 to the head 12 via the second sub-flow channel 47.

[0054] As a valve, the liquid ejection device 11 includes, for example, a first valve 41 and a second valve 42, and a third valve 48. The second valve 42 is located, for example, at the connection between the first sub-channel 46 and the second supply channel 19. The third valve 48 is located, for example, at the connection between the second sub-channel 47 and the second supply channel 19.

[0055] The second valve 42 and the third valve 48 are, for example, three-way valves. The second valve 42 connects or disconnects the flow channel unit 17 and the sub-receiving section 45. The third valve 48 connects or disconnects the sub-receiving section 45 and the head 12. In this modified example, as the path for the liquid to flow from the flow channel unit 17 toward the head 12, there is a path via the sub-receiving section 45 and a path not via the sub-receiving section 45. That is, the second valve 42 and the third valve 48 open or close the path via the sub-receiving section 45.

[0056] Under normal circumstances, liquid is supplied from the flow channel unit 17 to the head 12 without passing through the sub-receiving section 45. However, when the filter section 22 is replaced, liquid is transported from the flow channel unit 17 to the sub-receiving section 45 to empty the flow channel unit 17. For example, by driving the pump 43 with the first valve 41 closed and the path through the sub-receiving section 45 open, liquid is discharged from the flow channel unit 17. When the flow channel unit 17 is empty, the filter section 22 is replaced with the first valve 41 and the second valve 42 closed. The liquid stored in the sub-receiving section 45 is supplied to the head 12 via the second sub-flow channel 47. That is, when the filter section 22 is replaced, liquid is supplied from the flow channel unit 17 to the head 12 via the sub-receiving section 45. According to this modified example, the liquid discharged from the flow channel unit 17 for replacing the filter section 22 can be used in the recording of the medium 99.

[0057] like Figure 7 As shown, the flow channel unit 17 may also include multiple filter sections 22. In this case, the flow channel unit 17 has multiple flow channels 24 corresponding to the multiple filter sections 22. The first supply flow channel 18 is connected to the multiple flow channels 24 by branching. The second supply flow channel 19 is connected to the multiple flow channels 24 by branching.

[0058] The first valve 41 is located, for example, at a branch of the first supply channel 18. The second valve 42 is located, for example, at a branch of the second supply channel 19. The first valve 41 and the second valve 42 are, for example, three-way valves. The state of the first valve 41 and the second valve 42 determines one of the multiple channels 24 that supplies liquid flow.

[0059] According to this modified example, liquid can be supplied to the head 12 via other filter sections 22 while one filter section 22 is being replaced. Therefore, the possibility of interruption time due to filter section 22 replacement can be reduced. Interruption time, for example, refers to the time during which the liquid ejection device 11 is unable to record data on the medium 99.

[0060] The liquid ejection device 11 may also have multiple flow channel units 17. For example, in Figure 7 In the modified example shown, instead of one flow channel unit 17 having multiple filter sections 22, multiple flow channel units 17 having one filter section 22 can be provided. In this case, liquid can be supplied to the head 12 via other filter sections 22 while one filter section 22 is being replaced. Therefore, the possibility of interruption time is reduced.

[0061] like Figure 8As shown, the filter 32 can also be configured in a manner that is detachable with respect to the filter portion 22. The holding portion 33 has, for example, a first holding portion 51 and a second holding portion 52. The holding portion 33 is configured by assembling the first holding portion 51 and the second holding portion 52. The filter 32 is held by the holding portion 33 by being clamped by the first holding portion 51 and the second holding portion 52. Therefore, by detaching the first holding portion 51 and the second holding portion 52, the filter 32 can be detached from the holding portion 33. In this case, the filter 32 can be replaced individually.

[0062] As shown, the flow passage unit 17 can also be changed. In this modification example, the holding portion 33 is provided, for example, in a cylindrical shape. The handle portion 34 is provided, for example, in a circular plate shape. Therefore, the opening 28 is provided in a circular shape. Figure 9 Figure 10 As shown, the flow passage unit 17 can also be changed. In this modification example, the holding portion 33 is provided, for example, in a cylindrical shape. The handle portion 34 is provided, for example, in a circular plate shape. Therefore, the opening 28 is provided in a circular shape.

[0063] The holding portion 33 has a passage opening through which a liquid passes. In this modification example, for example, two passage openings are provided, one of which is an inlet 55 and the other of which is an outlet 56. That is, the holding portion 33 has the inlet 55 and the outlet 56 as passage openings. The inlet 55 is a hole that communicates with the first flow passage 25 in a case where the filter portion 22 is mounted to the flow passage member 21. A liquid that flows from the first flow passage 25 is introduced into the holding portion 33 via the inlet 55. The outlet 56 is a hole that communicates with the second flow passage 26 in a case where the filter portion 22 is mounted to the flow passage member 21. A liquid in the holding portion 33 is introduced outside the holding portion 33 via the outlet 56.

[0064] The filter 32 is housed in the holding portion 33. That is, the filter 32 is positioned in the holding portion 33. The filter 32 is provided, for example, in a cylindrical shape, and is positioned at a position where an inner surface of the holding portion 33 is contacted. Therefore, the filter 32 is positioned in a manner that blocks the inlet 55. Therefore, the filter 32 removes foreign matter in a case where a liquid is introduced into the holding portion 33 via the inlet 55. The filter 32 can also be positioned in a manner that blocks the outlet 56.

[0065] The filter 32 can be detached from the holding portion 33. Therefore, in this modification example, the filter 32 can be replaced individually by detaching the filter portion 22. The filter 32 is, for example, a mesh filter that is rounded into a cylindrical shape. The filter 32 can also be a block-shaped sponge filter.

[0066] ​The stopper 37 includes, for example, a first thread 57 and a second thread 58. The first thread 57 is provided on the flow passage member 21. The second thread 58 is provided on the filter portion 22. Specifically, the second thread 58 is provided on the holding member 31. That is, the flow passage member 21 has the first thread 57, and the holding member 31 has the second thread 58. In this modification, the first thread 57 is an internal thread, and the second thread 58 is an external thread. With the first thread 57 and the second thread 58 engaged with each other, the filter portion 22 is mounted on the flow passage member 21. According to this modification, the following effects can be obtained.

[0067] (6) With the first thread 57 and the second thread 58 engaged with each other, the filter portion 22 mounted on the flow passage member 21 is prevented from falling off.

[0068] The stopper 37 can also be a claw that presses the filter portion 22 mounted on the flow passage member 21. The claw is provided on the flow passage member 21, for example.

[0069] The liquid ejected from the head 12 is not limited to ink, and can be, for example, a liquid body in which particles of a functional material are dispersed in or mixed with a liquid, or the like. For example, the head 12 can be caused to eject a liquid body containing a material such as an electrode material or a pixel material used in the manufacture of liquid crystal displays, electroluminescent displays, and surface light emitting displays, in a dispersed or dissolved manner.

[0070] Hereinafter, the technical idea grasped from the above-described embodiments and modifications, and the effects thereof will be described.

[0071] (A) A flow passage unit is supplied with a liquid to be supplied to a head that ejects the liquid, and includes: a flow passage member having a flow passage; a filter portion configured to be detachable with respect to the flow passage member, the flow passage member having an opening that communicates with the flow passage and on which the filter portion is mounted, the filter portion having: a filter that filters a liquid flowing from the flow passage; and a holding member that holds the filter.

[0072] According to the above-described structure, the filter portion can be replaced with a new filter by detaching it from the flow passage unit via the opening. That is, when the filter is replaced, the use convenience of the flow passage unit is improved as compared with the case where the filter is replaced together with the flow passage unit.

[0073] (B) The above-described flow passage unit can include an elastic member between the flow passage member and the filter portion, the elastic member having elasticity.

[0074] According to the above structure, the possibility of liquid leaking from the flow path through the opening is reduced by the elastic member.

[0075] (C) The elastic member can be configured to be detachable from the flow path member in the flow path unit.

[0076] According to the above structure, the elastic member can be replaced.

[0077] (D) The elastic member can be fixed to the filter portion in the flow path unit.

[0078] According to the above structure, the elastic member can be replaced in conjunction with replacement of the filter portion.

[0079] (E) The flow path unit can include a stopper that presses the filter portion mounted on the flow path member.

[0080] According to the above structure, the filter portion can be prevented from inadvertently falling off the flow path member.

[0081] (F) The retaining member can include a retaining portion that houses the filter, the retaining portion having a passage opening through which liquid passes, the filter being positioned in the retaining portion in a manner that blocks the passage opening, the flow path member having a first thread, the retaining member having a second thread that engages the first thread, and the stopper including the first thread and the second thread.

[0082] According to the above structure, the filter portion mounted on the flow path member can be prevented from falling off by engaging the first thread and the second thread.

[0083] (G) A liquid ejection apparatus includes a head that ejects liquid, and a flow path unit through which liquid supplied to the head flows, the flow path unit including a flow path member having a flow path, a filter portion configured to be detachable from the flow path member, the flow path member having an opening that communicates with the flow path and on which the filter portion is mounted, the filter portion having a filter that filters liquid flowing from the flow path, and a retaining member that retains the filter.

[0084] According to the above structure, the same effects as the flow path unit described above can be obtained.

[0085] Symbol Explanation

[0086] 11…liquid ejecting apparatus; 12…head; 13…accommodating portion; 14…supply flow path; 16…nozzle; 17…flow path unit; 18…first supply flow path; 19…second supply flow path; 21…flow path member; 22…filter portion; 24…flow path; 25…first flow path; 26…second flow path; 27…filtered flow path; 28…opening; 31…retaining member; 32…filter; 33…retaining portion; 34…handle portion; 35…cutout; 36…elastic member; 37…stopper; 38…pin; 41…first valve; 42…second valve; 43…pump; 45…first sub-accommodating portion; 46…first sub-flow path; 47…second sub-flow path; 48…third valve; 51…first retaining portion; 52…second retaining portion; 55…inlet; 56…outlet; 57…first thread; 58…second thread; 99…medium.

Claims

1. A runner unit characterized by, A flow passage unit that is supplied with liquid to be supplied to a head that ejects liquid, and has: a flow passage member that has a flow passage; a filter section that is configured to be detachable with respect to the flow passage member; a stopper that presses the filter section that is mounted on the flow passage member, the flow passage member has an opening that communicates with the flow passage and on which the filter section is mounted, the filter section has: a filter that filters liquid that flows from the flow passage; a holding member that holds the filter, the holding member includes a holding section that houses the filter, the holding section has a passage opening through which liquid passes, the filter is positioned in the holding section in a manner that blocks the passage opening, the flow passage member has a first screw thread, the holding member has a second screw thread that engages with the first screw thread, the stopper includes the first screw thread and the second screw thread.

2. The flow passage unit according to claim 1, wherein an elastic member is provided between the flow passage member and the filter section, the elastic member having elasticity.

3. The flow passage unit according to claim 2, wherein the elastic member is configured to be detachable from the flow passage member.

4. The flow passage unit according to claim 2 or claim 3, wherein the elastic member is fixed to the filter section.

5. A liquid discharge apparatus characterized by comprising: a head that ejects liquid; a flow passage unit that supplies liquid to be supplied to the head with flow, the flow passage unit has: a flow passage member that has a flow passage; a filter section that is configured to be detachable with respect to the flow passage member; a stopper that presses the filter section that is mounted on the flow passage member, the flow passage member has an opening that communicates with the flow passage and on which the filter section is mounted, the filter section has: a filter that filters liquid that flows from the flow passage; a holding member that holds the filter, the holding member includes a holding section that houses the filter, the holding section has a passage opening through which liquid passes, the filter is positioned in the holding section in a manner that blocks the passage opening, the flow passage member has a first screw thread, the holding member has a second screw thread that engages with the first screw thread, the stopper includes the first screw thread and the second screw thread. ​

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