Liquid ejection head

Abstract

To prevent a sealing material from entering a space between a wiring member and an actuator member.SOLUTION: The COF14 includes a base 141, a plurality of wires 142 disposed on the base 141, a plurality of contacts 149 disposed at distal ends of the respective wires 142, and a covering film covering the wires 142. Further, the side COF14 includes the connecting portion 14X which is arranged on the upper surface of the actuating member and which has the contacts 149, and the folded-back portion 14X which is drawn out from the one end side 14X1 and the other end side 14X2 in the front-rear direction of the connecting portion 14Y and which is folded back upwardly. A sealing material is arranged along one end side 14X and the other end side 14X1 which are the end parts of the connecting part side 14X2 to shut off a space between the connecting part side 14X and the actuating member from an external space. At the end portion of the connection portion 14, the thickness of the coating film is locally reduced, so that a recess side 143X is formed on the lower surface of the coating film.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a liquid ejection head that ejects liquid from a nozzle. [Background technology]

[0002] Patent Document 1 discloses that the exposed side surface of the actuator member is sealed with a sealant to isolate the side surface from the atmosphere. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-073309 Summary of the Invention [Problem to be solved by the invention]

[0004] If the sealing material enters the space between the wiring member and the actuator member and reaches the region where the electrodes are arranged, it will hinder the deformation of the actuator member.

[0005] SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid ejection head that can prevent a sealant from entering the space between a wiring member and an actuator member. [Means for solving the problem]

[0006] The liquid ejection head of the present invention comprises a flow path member having a flow path including a plurality of nozzles, an actuator member for ejecting liquid from the plurality of nozzles, the actuator member being arranged on the upper surface of the flow path member and having an upper surface on which a plurality of first contacts corresponding to the plurality of nozzles are arranged, a wiring member including a connection portion arranged on the upper surface of the actuator member, the connection portion having a plurality of second contacts connected to each of the plurality of first contacts, and a sealant arranged along an end of the connection portion to isolate the space between the connection portion and the actuator member from the external space, the wiring member having a base material, a plurality of wires arranged on the underside of the base material and connected to each of the plurality of second contacts, and a coating film arranged on the underside of the base material and covering the plurality of wires, and the underside of the coating film has a recess at the end of the connection portion. [Effects of the Invention]

[0007] According to the present invention, sealing material that attempts to enter the space between the wiring member and the actuator member from the end of the connection portion can be stored in a recess provided at the end of the connection portion, thereby preventing the sealing material from entering the space. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a plan view of a printer 100 equipped with a head 10 according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view of the head 10. [Figure 3] FIG. 2 is a perspective view of the head 10. [Figure 4] FIG. 2 is a plan view of the head 10. [Figure 5] 5 is a cross-sectional view of the head 10 taken along line VV in FIG. 4. [Figure 6] 1 is a development view of a COF 14 included in the head 10 as viewed from the bottom side. [Figure 7] FIG. 7 is an enlarged view of region VII shown in FIG. [Figure 8A] FIG. 8 is a cross-sectional view taken along line VIIIA-VIIIA in FIG. 7. [Figure 8B] FIG. 8 is a cross-sectional view taken along line VIIIB-VIIIB in FIG. 7. [Figure 8C] FIG. 8 is a cross-sectional view taken along line VIIIC-VIIIC in FIG. 7. [Figure 9] FIG. 8C is a cross-sectional view of the head according to the second embodiment of the present invention, corresponding to FIG. 8B. DETAILED DESCRIPTION OF THE INVENTION

[0009] First Embodiment 1 includes a head 10 that is a first embodiment of a "liquid ejection head" according to the present invention. In the following description, the up-down direction is defined based on the state in which the printer 100 is installed for use, the front-rear direction is defined with the downstream side in the transport direction of the paper 9 being the front, and the left-right direction is defined when viewed from the front of the printer 100.

[0010] The printer 100 includes a head 10, a carriage 11 that holds the head 10, a scanning mechanism 30 that moves the carriage 11 and the head 10 left and right, a platen 40 that supports the paper 9 from below, a transport mechanism 50 that transports the paper 9 forward, and a control device 90.

[0011] The scanning mechanism 30 includes a pair of guides 31 and 32 that support the carriage 11, and a belt 33 connected to the carriage 11. The guides 31 and 32 and the belt 33 extend in the left-right direction. When the carriage motor is driven under the control of the control device 90, the belt 33 runs, and the carriage 11 and head 10 move left-right along the guides 31 and 32.

[0012] The platen 40 is disposed below the carriage 11 and the head 10. The paper 9 is supported on the upper surface of the platen 40.

[0013] The transport mechanism 50 has a roller 51 arranged behind the head 10 and a roller 52 arranged in front of the head 10. The head 10, the carriage 11, and the platen 40 are arranged between the roller 51 and the roller 52 in the front-to-rear direction.

[0014] Each of rollers 51 and 52 is made up of a set of rotating members. The set of rotating members includes an upper rotating member arranged above the transport path of paper 9 and a lower rotating member arranged below the transport path of paper 9. The upper rotating member and the lower rotating member are arranged so that their peripheral surfaces are in contact with each other.

[0015] When the conveying motor is driven under the control of the control device 90, the rotating members of the rollers 51 and 52 rotate. As the rotating members of the rollers 51 and 52 rotate while nipping the paper 9, the paper 9 is conveyed forward.

[0016] As shown in FIG. 2, the head 10 includes a flow path member 12 and an actuator member 13.

[0017] A plurality of nozzles 123 open on the lower surface of the flow path member 12. A common flow path 121 communicating with an ink tank and individual flow paths 122 each for each nozzle 123 are formed inside the flow path member 12. The individual flow paths 122 are flow paths that run from the outlet of the common flow path 121 through the pressure chambers 12P to the nozzles 123. A plurality of pressure chambers 12P open on the upper surface 12X of the flow path member 12. The common flow path 121 and the individual flow paths 122 correspond to the "flow paths" of the present invention.

[0018] The actuator member 13 is disposed on the upper surface 12X of the flow path member 12. The actuator member 13 includes a metallic vibration plate 131 disposed on the upper surface 12X of the flow path member 12 so as to cover the plurality of pressure chambers 12P, a piezoelectric layer 132 disposed on the upper surface of the vibration plate 131, and a plurality of individual electrodes 133 disposed on the upper surface of the piezoelectric layer 132 so as to face each of the plurality of pressure chambers 12P.

[0019] The diaphragm 131 and the individual electrodes 133 are electrically connected to the driver ICs 15A and 15B via the COF 14. The driver ICs 15A and 15B are electrically connected to the control device 90. The COF 14 corresponds to the "wiring member" of the present invention.

[0020] On the upper surface 13X of the actuator member 13, there are arranged contacts that are arranged on the upper surface of the piezoelectric layer 132 and electrically connected to the vibration plate 131, and contacts 139 that are arranged on the upper surfaces of the individual electrodes 133. The COF 14 has contacts 149 that are electrically connected to the contacts arranged on the upper surface 13X, and wiring 142 that electrically connects the contacts 149 and the driver ICs 15A and 15B. The contacts 139 correspond to the "first contacts" of the present invention. The contacts 149 correspond to the "second contacts" of the present invention.

[0021] Under the control of the control device 90, the driver ICs 15A and 15B maintain the potential of the diaphragm 131 at ground potential while changing the potential of the individual electrode 133. As a result, the potential of the individual electrode 133 changes between a predetermined drive potential and ground potential. At this time, the actuator 130, which is the portion of the diaphragm 131 and the piezoelectric layer 132 sandwiched between each individual electrode 133 and each pressure chamber 12P, deforms, changing the volume of the pressure chamber 12P. Pressure is applied to the ink in the pressure chamber 12P, causing ink to be ejected from the nozzle 123.

[0022] 5, the COF 14 includes a connection portion 14X disposed on the upper surface 13X of the actuator member 13, and two folded-back portions 14Y extending from one end 14X1 and the other end 14X2 of the connection portion 14X in the front-rear direction and folded back upward. The front-rear direction corresponds to the "first direction" of the present invention, and the left-right direction corresponds to the "second direction" of the present invention. The one end 14X1 and the other end 14X2 correspond to the "ends of the connection portion in the first direction" of the present invention, and extend in the left-right direction.

[0023] The connection portion 14X extends in the front-rear and left-right directions in parallel with the upper surface 13X. A plurality of contacts 149 (see FIG. 2) are arranged on the lower surface of the connection portion 14X.

[0024] Each of the two folded portions 14Y includes a vertical portion extending upward from one end 14X1 or the other end 14X2 of the connecting portion 14X, and a horizontal portion extending rearward or forward from the upper end of the vertical portion toward the center in the front-to-rear direction of the head 10. Of the two folded portions 14Y, a driver IC 15A is disposed on the upper surface of the horizontal portion of the front folded portion 14Y, and a driver IC 15B is disposed on the upper surface of the horizontal portion of the rear folded portion 14Y.

[0025] A frame 19 is disposed around the actuator member 13 on the upper surface 12X of the flow path member 12. The frame 19 is a rectangular frame-shaped member disposed along the periphery of the upper surface 12X. As shown in FIG. 3, four openings 191 are provided on each of the front and rear edges of the frame 19. Each opening 191 communicates with a common flow path 121 of the flow path member 12 and also communicates with an ink tank via a tube. For example, ink in an ink tank flows into the common flow path 121 via the tube and the four front openings 191, and returns to the ink tank via the four rear openings 191 and the tube.

[0026] 5, the actuator member 13 and the COF 14 are disposed within the frame 19. The pressing member 18, the support member 16, and the circuit board 17 are disposed in the space surrounded by the connection portion 14X and the two folded portions 14Y of the COF 14. The pressing member 18, the support member 16, and the circuit board 17 are disposed above the connection portion 14X. The vertical portion of the folded portion 14Y is disposed along the side surface of the pressing member 18.

[0027] 3 and 4, the flow path member 12 and the frame 19 are rectangular in shape with their long sides in the front-rear direction in a plane perpendicular to the up-down direction. The actuator member 13, the pressing member 18, and the support member 16 are also rectangular in shape with their long sides in the front-rear direction in a plane perpendicular to the up-down direction.

[0028] 5, the lower surface of the pressing member 18 is disposed with a gap between an area 13R on the upper surface 13X of the actuator member 13, where a plurality of individual electrodes 133 (see FIG. 2) are arranged, and a connection portion 14X connected to the area 13R. The peripheral edge of the lower surface of the pressing member 18 comes into contact with the connection portion 14X and presses the connection portion 14X downward toward the actuator member 13.

[0029] As shown in FIG. 5, the support member 16 is supported from below by a pressing member 18, and supports three circuit boards 17 on the lower surface.

[0030] The circuit board 17 is disposed in a recess provided on the upper surface of the pressing member 18 and is electrically connected to the COF 14.

[0031] A sealant 20 is disposed along the inner peripheral edge of the frame 19. The sealant 20 is disposed along the peripheral edge of the connection portion 14X, extending in the left-right direction along one end 14X1 and the other end 14X2 in the front-rear direction of the connection portion 14X, and also extending in the front-rear direction along one end 14X3 and the other end 14X4 in the left-rear direction of the connection portion 14X. The sealant 20 isolates the space between the connection portion 14X and the actuator member 13 from the external space. This prevents ion migration between the individual electrodes 133 caused by moisture in the air entering the space. The sealant 20 may be made of a non-conductive material such as fluororesin.

[0032] 6, the COF 14 has a rectangular substrate 141 that defines the outer shape of the COF 14, in addition to the contacts 149 and wiring 142 described above with reference to Fig. 2. The substrate 141 is provided across the connection portion 14X and the two folded portions 14Y. The substrate 141 may be made of a flexible and insulating material such as polyimide.

[0033] A plurality of wirings 142 and a plurality of contacts 149 are arranged on the substrate 141. Each wiring 142 is arranged across the connection portion 14X and the two folded portions 14Y, and extends from one of the driver ICs 15A, 15B arranged in the folded portion 14Y to a corresponding contact 149 arranged in the connection portion 14X. One of the driver ICs 15A, 15B is arranged at the base end of each wiring 142, and a corresponding contact 149 is arranged at the tip of each wiring 142. The wirings 142 and the contacts 149 may be made of any conductive material.

[0034] 6, the COF 14 has, on a substrate 141, a wiring region A in which a plurality of wirings 142 are arranged, and a contact region B, which is an area other than the wiring region A and in which a plurality of contacts 149 are arranged. In the wiring region A, the plurality of wirings 142 are aligned in the left-right direction.

[0035] The wiring region A is disposed across the connection portion 14X and the two folded portions 14Y, while the contact region B is disposed in the connection portion 14X and not in the folded portions 14Y.

[0036] The connection portion 14X has a wiring area A and a contact area B.

[0037] In the connection portion 14X, a total of 12 contact areas B are arranged at intervals in the left-right direction. Each contact area B extends in the front-rear direction and includes a tapered portion B1 provided at one end and the other end in the front-rear direction, and a main portion B2 at the other end. The tapered portion B1 has a tapered shape due to the arrangement of the wiring 142 around it, and its length in the left-right direction, i.e., its width, gradually decreases as it approaches one end or the other end in the front-rear direction. The main portion B2 has a substantially constant width. The contacts 149 are not arranged in the tapered portion B1, but in the main portion B2. In the main portion B2, multiple contacts 149 are arranged in two staggered rows along the front-rear direction.

[0038] The wiring area A provided in the connection portion 14X includes an outer edge portion A1 along one end 14X1 of the connection portion 14X, an outer edge portion A2 along the other end 14X2 of the connection portion 14X, and a plurality of clamping portions A3 that clamp the contact area B in the left-right direction.

[0039] The outer edge A1 extends in the left-right direction and is in contact with the tips of the tapered portions B1 at the rear of the contact areas B. The outer edge A2 extends in the left-right direction and is in contact with the tips of the tapered portions B1 at the front of the contact areas B.

[0040] The clamping portion A3 extends in the front-rear direction, similar to the contact area B. In the clamping portion A3, the portion adjacent to the tapered portion B1 of the contact area B in the left-right direction has a larger left-right length, i.e., a larger width, than the other portions.

[0041] As shown in Figures 6 and 7, a fixing member 21 is disposed in the tapered portion B1. The fixing member 21 corresponds to the "first fixing member" of the present invention and is disposed near the front-rear end of the contact area B, between the end of the contact area B and the plurality of contacts 149 in the front-rear direction. The fixing member 21 is not disposed at the tip of the tapered portion B1, but at a position spaced apart from the tip. The fixing member 21 has a generally elliptical shape that is long in the left-right direction, and the length of its major axis is generally the same as the width of that portion of the contact area B. Therefore, the fixing member 21 is close to the clamping portion A3 of the wiring area A at both left-right ends.

[0042] As shown in FIG. 6, the fixing members 21 are disposed on both ends of each contact area B in the front-rear direction.

[0043] The connection portion 14X further has a fixing member 22 arranged along one end 14X3 and the other end 14X4 in the left-right direction. The fixing member 22 is arranged outside the wiring area A of the connection portion 14X, in an area where neither the wiring 142 nor the contacts 149 are arranged. The fixing member 22 has a rectangular shape that is long in the front-rear direction. The length of the fixing member 22 in the front-rear direction is approximately the same as the length of the contact area B in the front-rear direction.

[0044] The fixing members 21 and 22 fix the connection portion 14X and the actuator member 13 to each other, and may be made of a thermosetting material such as epoxy resin. The fixing members 21 and 22 do not overlap either the wiring 142 or the contact 149.

[0045] 6, the twelve contact areas B are surrounded on all four sides by fixing members 21 and 22. A plurality of fixing members 21 are arranged spaced apart from each other in the left-right direction along one end 14X1 and the other end 14X2 in the front-rear direction of the connection part 14X. A fixing member 22 is arranged extending in the front-rear direction along one end 14X3 and the other end 14X4 in the left-right direction of the connection part 14X.

[0046] In addition to the wiring 142 and the contacts 149, a coating film 143 (see FIGS. 8A to 8C) is arranged on the base material 141. The coating film 143 is provided over the entire wiring region A (see FIG. 6) and covers the plurality of wirings 142 arranged in the wiring region A. The coating film 143 may be made of a non-conductive material such as solder resist.

[0047] In the connection portion 14X, wiring 142 and a coating film 143 are disposed on the lower surface of the base material 141, as shown in FIGS. 8A to 8C.

[0048] The thickness of the coating film 143 is not constant throughout the wiring region A (see FIG. 6), but there are locally small portions. Due to the change in thickness, a recess 143X is formed in the lower surface of the coating film 143 (see FIGS. 6, 7, and 8A to 8C).

[0049] The recesses 143X extend in the left-right direction at each of one end 14X1 and the other end 14X2 in the front-rear direction of the connection portion 14X (see FIG. 6). The recesses 143X provided along the one end 14X1 are located between an outer edge 14Xa that constitutes the one end 14X1 of the connection portion 14X and the plurality of contacts 149 arranged in the contact area B. The recesses 143X provided along the other end 14X2 are located between an outer edge 14Xb that constitutes the other end 14X2 of the connection portion 14X and the plurality of contacts 149 arranged in the contact area B.

[0050] A thickness Tb (see FIG. 8B) from the wiring 142 to the underside of the coating film 143 in a portion where the recess 143X is provided in the coating film 143 is equal to or less than half the thicknesses Ta, Tc (see FIGS. 8A and 8C) from the wiring 142 to the underside of the coating film 143 in a portion other than the recess 143X in the coating film 143. For example, the thicknesses Ta, Tc may be 10 to 20 μm, and the thickness Tb may be 3 to 10 μm.

[0051] As described above, according to this embodiment, the lower surface of the coating film 143 has recesses 143X at the ends of the connection portion 14X, i.e., at one end 14X1 and / or the other end 14X2 (see FIGS. 7 and 8A to 8C). In this case, the sealant 20 that attempts to enter the space between the COF 14 and the actuator member 13 from the ends of the connection portion 14X can be stored in the recesses 143X, thereby preventing the sealant 20 from entering the space.

[0052] The recess 143X is located between the outer edges 14Xa and 14Xb that form the end of the connection portion 14X and the plurality of contact points 149 (see FIG. 7). In this case, it is possible to prevent the sealing material 20 from reaching the contact points 149 and inhibiting the deformation of the actuator member 13.

[0053] The recess 143X extends in the left-right direction, similar to the sealing material 20 (see FIGS. 5 and 7). In this case, the intrusion of the sealing material 20 can be prevented over a wide range in the left-right direction.

[0054] The COF 14 further includes a folded portion 14Y folded upward from the end of the connection portion 14X (see FIG. 5). The end with the folded portion 14Y is more likely to float upward than the end without the folded portion 14Y. As a result, the vertical size of the opening that serves as the entrance to the space between the connection portion 14X and the actuator member 13 becomes larger, making it easier for the sealant 20 to enter the space. In this regard, in this embodiment, as shown in FIGS. 7 and 8B, a recess 143X is provided at the end of the connection portion 14X. The sealant 20 can be stored in the recess 143X, thereby preventing the sealant 20 from entering the space.

[0055] Both the sealing material 20 and the covering film 143 are non-conductive. In this case, the sealing material 20 stored in the recess 143X can complement the function of the covering film 143 to protect the wiring 142.

[0056] A thickness Tb (see FIG. 8B) from the wiring 142 to the underside of the coating film 143 at a portion where the recess 143X is provided in the coating film 143 is equal to or less than half the thickness Ta, Tc (see FIGS. 8A and 8C) from the wiring 142 to the underside of the coating film 143 at a portion other than the recess 143X in the coating film 143. In this case, the sealing material 20 can be more reliably stored in the recess 143X, and the sealing material 20 can be prevented from entering the space.

[0057] At the left-right ends of the connection portion 14X, i.e., one end 14X3 and / or the other end 14X4, a fixing member 22 is disposed extending in the front-rear direction, while at the front-rear ends of the connection portion 14X, i.e., one end 14X1 and / or the other end 14X2, a plurality of fixing members 21 are disposed spaced apart in the front-rear direction (see FIG. 6). Therefore, there are some locations where the fixing members 21 cannot block the sealing material 20 that has infiltrated from the front-rear ends of the connection portion 14X, and the sealing material 20 is likely to infiltrate from the front-rear ends of the connection portion 14X. In this regard, in the present embodiment, as shown in FIGS. 7 and 8B, a recess 143X is provided at the end, and the sealing material 20 can be stored in the recess 143X, thereby preventing the sealing material 20 from infiltrating into the space.

[0058] Second Embodiment The head according to the second embodiment of the present invention differs from the head according to the first embodiment in that a groove 143Y is provided in the bottom surface of the recess 143X as shown in FIG.

[0059] The groove 143Y is provided on the bottom surface of the recess 143X in an area sandwiched between two wiring groups 142G consisting of a plurality of wirings 142 in the left-right direction and in which neither the wirings 142 nor the contacts 149 are arranged. A plurality of grooves 143Y are arranged spaced apart from each other in the left-right direction on the bottom surface of the recess 143X provided at each of one end 14X1 and the other end 14X2 (see FIG. 6) of the connection portion 14X.

[0060] The depth Ty of the groove 143Y is equal to or less than half the thickness Tb from the wire 142 in the wire group 142G to the lower surface of the coating film 143. For example, the depth Ty may be 1.5 to 3 μm, and the thickness Tb may be 3 to 10 μm.

[0061] As described above, according to this embodiment, by providing the groove 143Y on the bottom surface of the recess 143X, the sealing material 20 can be stored more efficiently in the recess 143X. This makes it possible to more reliably prevent the sealing material 20 from entering the space.

[0062] The depth Ty of the groove 143Y is equal to or less than half the thickness Tb from the wires 142 in the wire group 142G to the lower surface of the covering film 143. In this case, if the depth Ty is not too large, the covering film 143 can sufficiently protect the wires 142.

[0063] <Modification> Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design modifications are possible within the scope of the claims.

[0064] The fixing members 21 and 22 may be omitted.

[0065] The depth of the recesses and grooves can be changed as desired.

[0066] The recesses are not limited to extending along the edge of the connecting portion, but may be scattered along the edge of the connecting portion.

[0067] The wiring member does not have to include the folded portion 14Y. For example, the wiring member may have a lead-out portion that extends horizontally from the end of the connection portion 14X instead of the folded portion 14Y. Alternatively, the wiring member may not have either the folded portion 14Y or the lead-out portion.

[0068] The flow path member is not limited to a serial type, but may be a line type.

[0069] The object onto which the liquid is ejected from the nozzles is not limited to paper, but may be, for example, cloth, a substrate, a plastic member, or the like.

[0070] The liquid ejected from the nozzles is not limited to ink, but may be any liquid (for example, a treatment liquid that aggregates or precipitates components in the ink, etc.).

[0071] The present invention is not limited to printers, but can also be applied to facsimiles, copiers, multifunction machines, etc. The present invention can also be applied to liquid ejection devices used for purposes other than image recording (for example, liquid ejection devices that eject conductive liquid onto a substrate to form a conductive pattern). [Explanation of symbols]

[0072] 10 heads (liquid ejection heads) 12 Flow path member 121 Common flow path (flow path) 122 Individual channel (channel) 123 nozzle 12X top 13 Actuator member 139 contact (first contact) 13X top 14 COF (wiring materials) 141 Base material 142 Wiring 142G wiring group 143 Coating membrane 143X Recess 143Y Groove 149 contacts (second contacts) 14X Connection Part 14X1 One end (end) 14X2 other end (end) 14Xa, 14Xb outer edge 14Y Folded part 20 Encapsulating material 21 Fixing member (first fixing member) 22 Fixing member (second fixing member)

Claims

1. a flow path member having a flow path including a plurality of nozzles; an actuator member for ejecting liquid from the plurality of nozzles, the actuator member being disposed on an upper surface of the flow path member and having an upper surface on which a plurality of first contacts corresponding to the plurality of nozzles are disposed; a wiring member including a connection portion disposed on the upper surface of the actuator member, the connection portion having a plurality of second contacts connected to the plurality of first contacts, respectively; a sealant disposed along an end of the connection portion to isolate a space between the connection portion and the actuator member from an external space; the wiring member includes a base material, a plurality of wires disposed on a lower surface of the base material and connected to the plurality of second contacts, respectively, and a coating film disposed on the lower surface of the base material and coating the plurality of wires; A liquid ejection head, wherein the lower surface of the coating film has a recess at the end of the connecting portion.

2. 2. The liquid ejection head according to claim 1, wherein the recess is located between an outer edge constituting the end of the connection portion and the plurality of second contact points.

3. the end of the connection portion is an end of the connection portion in a first direction perpendicular to the up-down direction, and extends in a second direction intersecting both the first direction and the up-down direction; the sealing material extends in the second direction along the edge, The liquid ejection head according to claim 1 , wherein the recess extends in the second direction.

4. 2. The liquid ejection head according to claim 1, wherein the wiring member further includes a folded portion folded upward from the end of the connecting portion.

5. 2. The liquid ejection head according to claim 1, wherein the sealing material and the coating film are both non-conductive.

6. A liquid ejection head as described in claim 1, characterized in that the thickness from the wiring to the underside of the coating film in the portion where the recess is provided in the coating film is less than half the thickness from the wiring to the underside of the coating film in the portion other than the recess in the coating film.

7. the end of the connection portion is an end of the connection portion in a first direction perpendicular to the up-down direction, and extends in a second direction intersecting both the first direction and the up-down direction; A liquid ejection head as described in claim 1, characterized in that a groove is provided on the bottom surface of the recess in an area sandwiched between two wiring groups consisting of the plurality of wirings in the second direction, where neither the plurality of wirings nor the plurality of second contacts are arranged.

8. 8. The liquid ejection head according to claim 7, wherein the depth of the groove is equal to or less than half the thickness of the coating film from the wiring in the wiring group to the lower surface of the coating film.

9. the end of the connection portion is an end of the connection portion in a first direction perpendicular to the up-down direction, and extends in a second direction intersecting both the first direction and the up-down direction; a plurality of first fixing members that fix the connection portion and the actuator member to each other are arranged along the end of the connection portion and spaced apart from each other in the second direction; A liquid ejection head as described in any one of claims 1 to 8, characterized in that a second fixing member that fixes the connection portion and the actuator member to each other is arranged extending in the first direction along the end of the connection portion in the second direction.

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