Liquid discharge head and recording device

Abstract

To provide a liquid discharge head which can suppress intrusion of liquid to an electric connection part of a liquid discharge head and can be easily attached / detached to / from a recording device, and a recording device having the same.SOLUTION: A liquid discharge head includes: a discharge unit that discharges liquid; a housing 420 that covers the discharge unit; and an electric connection part 402 which is electrically connected to an electric wiring board 12 of a recording device. The electricity is supplied to the discharge unit via the electric connection part from the recording device. The housing includes an electric connection part cover member 430 that covers the electric connection part. The electric connection part cover member can be opened / closed with respect to the electric connection part.SELECTED DRAWING: Figure 21

Description

[Technical field]

[0001] The present invention relates to a liquid ejection head and a recording apparatus. [Background technology]

[0002] An inkjet recording device has a liquid ejection head that ejects liquid onto a recording medium. In particular, liquid ejection heads used for business, commercial, and industrial purposes are required to have high durability that allows long-term use. One of the factors that reduces the durability of a liquid ejection head is, for example, liquid infiltration into the electrical connection between the inkjet recording device and the liquid ejection head. Factors that cause liquid infiltration into the electrical connection include, for example, dripping of liquid from the liquid connection when attaching and detaching the liquid ejection head from the recording device, and mist that occurs when ejecting liquid such as ink. In such cases, there is a problem that the electrical circuit is short-circuited, causing the liquid ejection head to break down.

[0003] As a method for solving the above problem, Patent Document 1 discloses a liquid ejection head having a cover member that covers an electrical connection between a recording device and the liquid ejection head. Furthermore, the cover member is configured to be deformable so as to reduce the gap between the cover member and the electrical connection, thereby suppressing the infiltration of liquid into the electrical connection of the liquid ejection head. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2014-4767 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, while the configuration of Patent Document 1 can prevent liquid from entering the electrical connection section, the cover member cannot be opened or closed, which raises concerns that it may be difficult to easily attach and detach the electrical connection section when attaching and detaching the liquid ejection head to and from the recording apparatus.

[0006] SUMMARY OF THE DISCLOSURE In view of the above problems, an object of the present invention is to provide a liquid ejection head that is capable of preventing liquid from seeping into the electrical connection portion of the liquid ejection head and that is easily attachable to and detachable from a recording apparatus. [Means for solving the problem]

[0007] In order to solve the above problems, the liquid ejection head of the present invention is a liquid ejection head having an ejection unit that ejects liquid, a housing that covers the ejection unit, and an electrical connection portion that is electrically connected to an electrical wiring board of a recording device, and electricity is supplied from the recording device to the ejection unit via the electrical connection portion, wherein the housing has an electrical connection portion cover member that covers the electrical connection portion, and the electrical connection portion cover member is capable of being opened and closed relative to the electrical connection portion. Effect of the Invention

[0008] According to the present invention, it is possible to provide a liquid ejection head that is capable of preventing liquid from entering the electrical connection portion of the liquid ejection head and is easily attachable to and detachable from a recording apparatus, and a recording apparatus having the same. [Brief description of the drawings]

[0009] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. 2 is a perspective view illustrating an electrical connection configuration of the liquid ejection head. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 4 is an enlarged view of an electrode portion of the discharge unit. [Figure 10] FIG. 4 is a plan view of the liquid ejection head as viewed from the ejection unit side. [Figure 11] FIG. 2 is a cross-sectional view of the liquid ejection head taken along line AA. [Figure 12] FIG. 5 is a cross-sectional view of the liquid ejection head taken along the line BB. [Figure 13] FIG. 3 is a cross-sectional view of the liquid ejection head taken along line CC. [Figure 14] FIG. 2 is a perspective view showing a liquid connection configuration of the liquid ejection head. [Figure 15] 4 is a cross-sectional view of a liquid connection portion between the liquid supply unit and the liquid supply member. [Figure 16] FIG. [Figure 17] FIG. [Figure 18] FIG. [Figure 19] FIG. [Figure 20] DD cross-sectional view of the cooling unit. [Figure 21] FIG. 2 is a cross-sectional view showing an electrical connection portion between the recording apparatus and the liquid ejection head. [Figure 22] FIG. 4 is a perspective view of a liquid ejection head to which an electric wiring board is connected. [Figure 23] FIG. 4 is a cross-sectional view of a liquid ejection head to which an electric wiring board is connected. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the following embodiment does not limit the subject matter of the present invention, and not all combinations of features described in the embodiment are necessarily essential to the solution of the present invention. Note that the same reference numbers are used for the same components.

[0011] (First embodiment) In this embodiment, a method of ejecting liquid using a piezoelectric element that generates pressure by applying a voltage will be described as an example. Note that the present invention can also be applied to liquid ejection heads that employ a thermal method of ejecting liquid using a thermoelectric conversion element and various other liquid ejection methods.

[0012] Although the present embodiment is an inkjet recording apparatus in a form in which liquid such as ink is circulated between a tank and a liquid ejection head, other forms are also possible. For example, instead of circulating the ink, two tanks may be provided on the upstream side and downstream side of the liquid ejection head, and the ink may flow from one tank to the other tank to cause the ink to flow in the pressure chamber.

[0013] 1 is a perspective view of a recording apparatus 10 according to this embodiment. The recording apparatus 10 of this embodiment is a one-pass type inkjet recording apparatus that records an image or the like by moving the recording medium 20 relative to a liquid ejection head 100 that ejects liquid arranged across the entire width of the recording medium 20. The recording medium 20 is transported in the direction of arrow A by a transport unit 11, and recording is performed by the liquid ejection head 100. The inkjet recording apparatus of this embodiment has two liquid ejection heads in rows a and b for each of cyan (C), magenta (M), yellow (Y), and black (K). The arrangement of the liquid ejection heads and the number of liquid ejection heads are not limited to this.

[0014] Next, the configuration of the liquid ejection head 100 according to this embodiment will be described. FIG. 2 and FIG. 3 are perspective views of the liquid ejection head 100 according to this embodiment, and FIG. 4 is an exploded perspective view. In the liquid ejection head 100 of this embodiment, four recording element substrates 210 capable of ejecting liquid are arranged in a staggered pattern on a support member 310. The number of recording element substrates 210 is not limited to four. The recording element substrates 210 do not have to be arranged in a staggered pattern. An ink connection portion 501 and a refrigerant connection portion 611, which are liquid connectors, are provided at the approximate center of the upper end of the housing 420 of the liquid ejection head 100, and are connected to an ink supply portion and a refrigerant supply portion on the recording device 10 side, respectively, to supply liquid such as ink and refrigerant into the liquid ejection head 100. In addition, the liquid ejection head exterior portion has a housing 420 that covers the ejection unit 200 that ejects liquid. Furthermore, the housing 420 has an electrical connection part cover member 430 that covers the electrical connection part 402 that is electrically connected to the electrical wiring board 12 (FIG. 21) of the inkjet recording device. In this embodiment, two electrical connection parts 402 and two electrical connection part cover members 430 are provided for one liquid ejection head 100, but this is not limited to the above. When at least two electrical connection parts 402 and two electrical connection part cover members 430 are provided, it is preferable that at least two electrical connection part cover members face each other so as to sandwich the liquid connection part. This makes it possible to prevent both the electrical connection cover on the left side of the paper and the electrical connection cover on the right side of the paper in FIG. 21 from being soiled with liquid. If liquid leaks from the ink connection part 501 to the left side of the paper, the liquid may adhere to the electrical connection part cover on the left side of the paper, but since the electrical connection part cover on the right side of the paper is on the opposite side, the possibility of the liquid adhering to the right electrical connection part cover is low.

[0015] The liquid ejection head 100 has a support unit 300 including a support member 310, an electrical relay board 400, and an electrical relay board support member 410 that holds it. That is, the electrical relay board 400 is disposed inside a housing 420. Furthermore, the liquid ejection head 100 has a liquid supply unit 500 that supplies liquid to the ejection unit 200 via the support unit 300, and a cooling unit 600 that cools the drive circuit. The support member 310 is disposed between the ejection unit 200 and the housing 420. The configuration of each part of the liquid ejection head 100 will be described in detail below.

[0016] FIG. 5 is a perspective view for explaining the electrical connection configuration of the liquid ejection head 100 according to this embodiment. The liquid ejection head 100 has an electrical connection portion 402, an electrical relay board 400, an electrical connection portion 401, and a flexible wiring board 250 as the electrical connection configuration. The recording device 10 and the liquid ejection head 100 are electrically connected by connecting the electrical wiring board 12 (FIG. 21) and the electrical relay board 400 at the electrical connection portion 402. The electrical relay board 400 supplies (relays) electricity supplied from the recording device to the flexible wiring board 250 via the electrical connection portion 401. The electricity supplied to the flexible wiring board 250 is supplied to the recording element board 210 via an electrode portion 212 (FIG. 9) described later. In this way, the ejection drive signal and power required for ejecting liquid from the liquid ejection head are supplied from the recording device 10 to the liquid ejection head 100. In other words, electricity is supplied from the recording device 10 to the ejection unit 200 via the electrical connection portion 402. By consolidating the wiring using the electrical circuit in the electrical relay board 400, the number of terminals of the electrical connection part 402 can be made smaller than the number of terminals of the recording element board 210. This reduces the number of electrical connections required when attaching and detaching the liquid ejection head 100 to the recording apparatus 10. The electrical connection part 402 is preferably formed at an end part of the electrical relay board 400.

[0017] 6 and 7 are perspective views of the discharge unit 200, and FIG. 8 is an exploded perspective view. The discharge unit 200 has a recording element substrate 210 equipped with a pressure generating element that generates pressure for discharging liquid. Furthermore, the discharge unit 200 is composed of a recording element substrate flow path member 220 that supplies liquid to the recording element substrate 210, a flow path member 240, and a recording element substrate support member 230 that is joined to the discharge surface side of the recording element substrate 210. It is preferable that the pressure generating element has a piezoelectric element that is driven by application of a voltage. Piezoelectric elements generally have a longer life than thermoelectric conversion elements that are pressure generating elements of a thermal system, and in a piezoelectric recording device, the liquid discharge head is likely to be replaced more frequently. Therefore, the present invention is more suitable for a piezoelectric recording device.

[0018] 9 is an enlarged view of the electrode portion of the discharge unit 200. As shown in FIG. 9, the electrode portions 212 are provided on the thin plate portions 261 at both ends of the recording element substrate 210. The recording element substrate 210 and the flexible wiring substrate 250 are electrically connected by contacting the first electrical connection portion 252 of the flexible wiring substrate 250 with the electrode portions 212. In order to prevent liquid from entering the electrical connection portion and to reinforce the thin plate portion 261 of the recording element substrate 210, the recording element substrate support member 230 is joined to the discharge surface side of the thin plate portion 261. The flexible wiring substrate 250 is provided with a drive circuit board 251 for driving the recording elements of the recording element substrate 210.

[0019] FIG. 10 is a plan view of the liquid ejection head 100 seen from the surface of the ejection unit 200. Furthermore, FIG. 11 shows an AA cross-sectional view, FIG. 12 shows a BB cross-sectional view, and FIG. 13 shows a CC cross-sectional view of the liquid ejection head 100 of this embodiment. The housing 420 has a sealing member 421 that is connected to the upper part of the support member 310 and can seal the gap between the housing and the support member 310. With this configuration, for example, it is possible to suppress the intrusion of liquid into the liquid ejection head 100 due to dripping of liquid from the ink connection part 501 or the refrigerant connection part 611 when attaching or detaching the liquid ejection head 100 from the recording device 10, or mist during ejection of liquid such as ink. As the material for the sealing member 421, elastomer or the like can be suitably used. As a method for forming the sealing member 421, for example, a method of two-color molding (bonding) or bonding to the housing 420 can be mentioned. When the housing 420 and the sealing member 421 are molded (bonded) in two colors, it becomes more difficult to mold the housing 420, but it is possible to reduce the number of parts and mounting steps that make up the liquid ejection head 100. On the other hand, when the housing 420 and the sealing member 421 are bonded together, the number of parts and mounting steps that make up the liquid ejection head 100 increases, but the manufacturing of the sealing member 421 can be performed more easily than with two-color molding.

[0020] 14 is a perspective view showing the liquid connection configuration of the liquid ejection head 100 according to this embodiment. The liquid supply unit 500 has an ink connection section 501, and is connected to a liquid supply system of the recording device 10. This allows liquid to be supplied from the supply system of the recording device to the liquid ejection head 100, and liquid not ejected from the liquid ejection head 100 is collected into the supply system of the recording device 10. In this way, the liquid can be circulated between the recording device 10 and the liquid ejection head 100. It is preferable that a filter (not shown) communicating with each opening of the ink connection section 501 is provided inside the liquid supply unit 500 in order to remove foreign matter from the ink being supplied.

[0021] 15 is a cross-sectional view of a liquid connection portion between a liquid supply unit 500 and a liquid supply member 330. Liquid that has flowed into the liquid ejection head 100 from the recording apparatus 10 side through an ink connection portion 501 passes through a communication port 502 and is supplied to the liquid supply member 330. The gap between the liquid supply unit 500 and the liquid supply member 330 is sealed by an elastic member 503.

[0022] The support member 310 and each ejection unit 200 are fluidly connected by a communication port 241 of the flow path member 240. A liquid flow path 242 is formed in the flow path member 240, and is fluidly connected to the recording element substrate flow path member 220 via the communication port 221.

[0023] 17 is a cross-sectional view of a flow path in the recording element substrate. The liquid flowing in from each communication port 221 passes through a common flow path 222 and is supplied to the recording element substrate 210. The ejection unit 200 (recording element substrate 210) has a piezoelectric element 262 that is driven by application of a voltage, and ejects liquid from the ejection port 213 by pressure generated by driving the piezoelectric element 262. In the liquid ejection head 100 of this embodiment, liquid that is not ejected from the ejection port is collected in the inkjet recording device through the common flow path 222 and the communication port 221, as described above.

[0024] FIG. 18 is a perspective view of a cooling unit 600 for cooling the drive circuit board 251, FIG. 19 is an exploded perspective view, and FIG. 20 is a DD cross-sectional view of the cooling unit 600. The cooling unit 600 has a refrigerant connection part 611 and is connected to a refrigerant supply system of the recording device 10. This allows the refrigerant to be supplied from the refrigerant supply system of the recording device 10 to the cooling unit 600, and the refrigerant that has passed through the cooling unit 600 is collected by the refrigerant supply system of the recording device 10. In this way, the refrigerant can circulate between the recording device 10 and the cooling unit 600. The refrigerant that flows in from the refrigerant connection part 611 is branched by a refrigerant flow path formed between the first refrigerant supply member 610 and the second refrigerant supply member 620. The second refrigerant supply member 620 and the first cooling member 630 are liquid-connected via a seal member 670. The refrigerant branched in the second refrigerant supply member 620 circulates in a refrigerant flow path formed between the first cooling member 630 and the second cooling member 640, and flows out again into the second refrigerant supply member 620. The first cooling member 630 is configured to transfer heat generated during operation of the drive circuit board 251 to the refrigerant in the first cooling member 630 by abutting the drive circuit board 251 with the heat conductive member 650 sandwiched therebetween. An elastic member 660 is provided between the two flexible wiring boards 250, which makes it possible to reliably bring the heat conductive member 650 into close contact with the drive circuit board 251. It is preferable to select a material with high thermal conductivity, such as aluminum, for the first cooling member 630 in order to easily transfer heat generated in the drive circuit board 251.

[0025] The electrical connection cover member 430, which is a characteristic feature of the present invention, will be described in detail. FIG. 21 is a cross-sectional view showing the electrical connection between the recording device 10 and the liquid ejection head 100. FIG. 22 is a perspective view of the liquid ejection head to which an electrical wiring board is connected, and FIG. 23 is a cross-sectional view of the liquid ejection head to which an electrical wiring board is connected. As described above, the ink connection portion 501 and the coolant connection portion 611 are provided at the approximate center of the upper end portion of the liquid ejection head 100, and are connected to the liquid supply portion and the coolant supply portion on the recording device side, respectively, and liquid such as ink and coolant are supplied into the liquid ejection head 100. In the liquid ejection head of this embodiment, two electrical connection portions 402 and two electrical connection cover members 430 are provided for one liquid ejection head 100, and are arranged opposite to each other so as to sandwich the liquid connection portion. The connection direction of the electrical connection part 402 and the electrical wiring board 12 is substantially the same as the connection direction of the ink connection part 501 and the coolant connection part 611 and the liquid supply part and the coolant supply part on the recording apparatus side, and is substantially vertical when the liquid ejection head 100 is in use. Here, "when the liquid ejection head 100 is in use" refers to the arrangement state of the liquid ejection head 100 when the recording apparatus 10 can normally record images, characters, etc.

[0026] The housing 420 has an electric connection part cover member 430 that covers the electric connection part 402. By covering the electric connection part 402 with the electric connection part cover member 430, for example, it is possible to suppress the infiltration of liquid into the electric connection part 402 due to dripping of liquid from the liquid connection part when attaching and detaching the liquid ejection head from the recording device, or mist when ejecting liquid such as ink. In addition, the electric connection part cover member 430 is configured to be openable and closable with respect to the electric connection part 402. Specifically, the electric connection part cover member has a fixed part 450 fixed to the housing and an abutting part 460 that abuts against the electric wiring board 12 of the recording device, and has a rotation axis for rotating with the fixed part 450 as a starting point. By having the rotation axis, the electric connection part cover member 430 can rotate in the direction of the arrow in FIG. 21. Note that, when the electric connection part cover members 430 are arranged opposite to each other so as to sandwich the liquid connection part as shown in FIG. 21, the electric connection part cover members 430 can be opened and closed in opposite directions. With this configuration, when the recording apparatus is in use, the electrical connection portion cover member 430 protects the electrical connection portion 402, and when the liquid ejection head is to be attached or detached, the liquid ejection head can be easily attached or detached to or from the recording apparatus.

[0027] Electrical connection portion cover member 430 has protrusions 480, and housing 420 has recesses 470 into which the protrusions fit. As a result, when electrical connection portion cover member 430 is in a closed state relative to electrical connection portion 402, protrusions 480 fit into recesses 470, making it possible to maintain the closed state and further suppressing the intrusion of liquid into electrical connection portion 402.

[0028] In addition, the contact portion 460 is formed with an elastic member 431 that seals the periphery of the electrical connection portion 402 when the electrical connection portion cover member 430 is closed. With this configuration, the sealing performance around the electrical connection portion 402 is improved, and the infiltration of liquid into the electrical connection portion 402 can be further suppressed. As a material for the elastic member 431, elastomer or the like can be suitably used. As a method for forming the elastic member 431, for example, two-color molding (bonding) or bonding to the electrical connection portion cover member 430 can be mentioned. In the case of two-color molding (bonding), the molding of the electrical connection portion cover member 430 becomes more difficult, but the number of parts and mounting steps constituting the liquid ejection head 100 can be reduced. On the other hand, in the case of bonding, the number of parts and mounting steps constituting the liquid ejection head 100 increases, but the elastic member 431 can be manufactured more easily than in the case of two-color molding.

[0029] Moreover, it is preferable that the electric wiring board 12 that comes into contact with the contact portion 460 is a flexible wiring board. When the electric wiring board 12 is formed of a flexible material such as a flexible wiring board, the sealing performance between the abutment portion 460 and the electric wiring board 12 is improved, and the infiltration of liquid into the electrical connection portion 402 can be further suppressed.

[0030] As described above, the liquid ejection head of this embodiment can be easily attached to and detached from the recording apparatus 10 while preventing liquid from entering the electrical connection portion 402 with the recording apparatus 10.

[0031] To summarize the present invention as described above, the present invention includes the following configurations.

[0032] (Configuration 1) A discharge unit that discharges a liquid; A housing that covers the discharge unit; an electrical connection portion electrically connected to an electrical wiring board of the recording device; having a liquid ejection head in which electricity is supplied from the recording apparatus to the ejection unit via the electrical connection portion, the housing has an electrical connection portion cover member that covers the electrical connection portion, The liquid ejection head according to claim 1, wherein the electrical connection portion cover member is capable of being opened and closed relative to the electrical connection portion.

[0033] (Configuration 2) The electrical connection portion cover member has a protrusion, 2. The liquid ejection head according to configuration 1, wherein the housing has a recess into which the protrusion fits.

[0034] (Configuration 3) 3. The liquid ejection head according to configuration 1 or 2, wherein the electrical connection portion cover member has a fixing portion that is fixed to the housing and a contact portion that is in contact with the electrical wiring board.

[0035] (Configuration 4) The liquid ejection head according to configuration 3, wherein the electrical connection portion cover member has a rotation axis for rotating about the fixed portion.

[0036] (Configuration 5) 5. The liquid ejection head according to configuration 3 or 4, wherein an elastic member is adhered to the contact portion.

[0037] (Configuration 6) 5. The liquid ejection head according to configuration 3 or 4, wherein an elastic member is joined to the contact portion.

[0038] (Configuration 7) the discharge unit includes a recording element substrate having a pressure generating element that generates a pressure for discharging liquid, and a flexible wiring substrate that is electrically connected to the recording element substrate; an electrical relay board is disposed inside the housing, the electrical relay board being electrically connected to the flexible wiring board and relaying electricity to the flexible wiring board; The liquid ejection head according to any one of configurations 1 to 6, wherein the electrical connection portion is formed at an end portion of the electrical relay board.

[0039] (Configuration 8) 8. The liquid ejection head according to configuration 7, wherein the pressure generating element is a piezoelectric element that is driven by application of a voltage.

[0040] (Configuration 9) The liquid ejection head according to any one of configurations 1 to 8, wherein the housing has a liquid connection part that is liquid-connected to the recording apparatus.

[0041] (Configuration 10) The electrical connection portion and the electrical connection portion cover member are provided in at least two pieces. 10. The liquid ejection head according to configuration 9, wherein the at least two electrical connection portion cover members face each other so as to sandwich the liquid connection portion.

[0042] (Configuration 11) 11. The liquid ejection head according to configuration 10, wherein the at least two electrical connection portion cover members can be opened and closed in opposite directions.

[0043] (Configuration 12) a support member that supports the discharge unit and is disposed between the discharge unit and the housing; a sealing member that seals a gap between the housing and the support member; 12. The liquid ejection head according to any one of configurations 1 to 11, further comprising:

[0044] (Configuration 13) 13. The liquid ejection head according to configuration 12, wherein the sealing member is adhered to the housing.

[0045] (Configuration 14) 13. The liquid ejection head according to aspect 12, wherein the sealing member is joined to the housing.

[0046] (Configuration 15) 15. The liquid ejection head according to any one of configurations 1 to 14, wherein the electric wiring board is a flexible wiring board.

[0047] (Configuration 16) 16. A recording apparatus having the liquid ejection head according to any one of configurations 1 to 15. [Explanation of symbols]

[0048] 10 Recording Device 12 Electrical wiring section 100 Liquid ejection head 200 Discharge Unit 250 Flexible wiring board 400 Electrical relay board 402 Electrical Connections 420 Case 421 Sealing member 430 Electrical connection cover member 431 Elastic Members

Claims

1. a recording element substrate for ejecting liquid; an electrical connection portion electrically connected to an electrical wiring board of a recording device for supplying power to the recording element board; a housing having an opening for inserting the electrical wiring board and accommodating the electrical connection portion; an opening / closing member capable of opening and closing the opening; A liquid ejection head having The liquid ejection head according to claim 1, wherein, in a closed state where the opening / closing member closes the opening, the electrical wiring section is sandwiched between the opening / closing member and a part of the housing.

2. The opening / closing member has a protrusion, The liquid ejection head according to claim 1 , wherein the housing has a recess into which the protrusion fits.

3. The liquid ejection head according to claim 1 , wherein the opening / closing member has a fixed portion that is fixed to the housing and a contact portion that contacts the electrical wiring board.

4. The liquid ejection head according to claim 3 , wherein the opening / closing member has a rotation axis for rotating around the fixed portion.

5. 4. The liquid ejection head according to claim 3, wherein an elastic member is bonded to the contact portion.

6. 4. The liquid ejection head according to claim 3, wherein an elastic member is bonded to the contact portion.

7. A flexible wiring board electrically connected to the recording element substrate, a power relay board is disposed inside the housing, the power relay board being electrically connected to the flexible wiring board and relaying power to the flexible wiring board; 2. The liquid ejection head according to claim 1, wherein the electrical connection portion is formed at an end portion of the power relay board.

8. The recording element substrate has a pressure generating element that generates pressure for ejecting liquid, 2. The liquid ejection head according to claim 1, wherein the pressure generating element is a piezoelectric element that is driven by application of a voltage.

9. The liquid ejection head according to claim 1 , wherein the housing has a liquid connection part that is liquid-connected to the recording device.

10. The electrical connection portion and the opening / closing member are at least two in number, The liquid ejection head according to claim 9 , wherein the at least two opening / closing members are opposed to each other so as to sandwich the liquid connection portion therebetween.

11. 11. The liquid ejection head according to claim 10, wherein the at least two opening / closing members are capable of opening and closing in opposite directions.

12. a support member that supports the recording element substrate and is disposed between the recording element substrate and the housing; a sealing member that seals a gap between the housing and the support member; The liquid ejection head according to claim 1 , further comprising:

13. The liquid ejection head according to claim 12 , wherein the sealing member is adhered to the housing.

14. The liquid ejection head according to claim 12 , wherein the sealing member is bonded to the housing.

15. 2. The liquid ejection head according to claim 1, wherein the electrical wiring board is a flexible wiring board.

16. A recording apparatus comprising the liquid ejection head according to any one of claims 1 to 15.

Images