Electric connection structure, fluid discharge head, and manufacturing method of the electric connection structure

Abstract

To provide an electric connection structure, a fluid discharge head, and a manufacturing method of the electric connection structure, in which peeling of an anisotropic conductive membrane hardly occurs.SOLUTION: An electric connection structure includes: a plurality of first leads 30 that are arranged in an X direction along an edge part 15 of a first electric wiring member 10, and are formed in a convex shape; a plurality of second leads 40 that are arranged in the X direction along an edge part 25 of a second electric wiring member 20, and are faced to the corresponding first leads 30; and an anisotropic conductive membrane 50 that is positioned between the plurality of first leads 30 and the plurality of second leads 40, and electrically connects the plurality of first leads 30 and the plurality of second leads 40 that correspond to each other. The plurality of first leads 30 each have a first end part lead 35 that is positioned at one end part in the X direction, and a first electric wiring member 100 has a first adding part 60 that at least a part thereof contacts with the first end part lead 35 in the X direction and is formed in the convex shape.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an electrical connection structure, a liquid ejection head, and a method for manufacturing the electrical connection structure. [Background technology]

[0002] There is known a technique for electrically connecting electrical wiring members using an anisotropic conductive film. The anisotropic conductive film is attached to one of the electrical wiring members in advance. Patent Document 1 describes that a dummy electrode is disposed on the side of the electrode to prevent the anisotropic conductive film from peeling off from the electrode. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-6632 A Summary of the Invention [Problem to be solved by the invention]

[0004] The dummy electrode described in Patent Document 1 has a gap between it and the electrode. Therefore, if an end of the anisotropic conductive film is positioned on the gap due to an error in application of the anisotropic conductive film, the anisotropic conductive film is likely to peel off starting from the end.

[0005] An object of the present invention is to provide an electrical connection structure in which peeling of an anisotropic conductive film is unlikely to occur. [Means for solving the problem]

[0006] The electrical connection structure of the present invention includes a plurality of first leads arranged in one direction along an edge of a first electrical wiring member and having a convex shape, a plurality of second leads arranged in one direction along an edge of a second electrical wiring member and each of which faces a corresponding first lead, and an anisotropic conductive film located between the plurality of first leads and the plurality of second leads and electrically connecting the corresponding plurality of first leads and the plurality of second leads. The plurality of first leads include a first end lead located at one end in the one direction, and the first electrical wiring member has a first additional portion having a convex shape and at least a portion of which contacts the first end lead in the one direction. Effect of the Invention

[0007] According to the present invention, it is possible to provide an electrical connection structure in which peeling of the anisotropic conductive film is unlikely to occur. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view showing a main part of a liquid ejection head according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a plan view of a first electrical wiring member and a second electrical wiring member to which an anisotropic conductive film is attached. [Diagram 3] 4A to 4C are partial cross-sectional views of a first electric wiring member and a second electric wiring member before and after bonding. [Figure 4] FIG. 2 is a diagram showing an apparatus for attaching an anisotropic conductive film to a first electrical wiring member. [Diagram 5] 11A to 11C are diagrams showing a process of attaching an anisotropic conductive film to a first electrical wiring member. [Figure 6] 11 is a diagram showing an attachment error in the X direction of an anisotropic conductive film. FIG. [Figure 7] 11 is a diagram showing a bonding error in the Y direction of an anisotropic conductive film. FIG. [Figure 8] 4 is a side view showing the state of an end portion of an anisotropic conductive film. FIG. [Figure 9] 1A to 1C are diagrams illustrating the mechanism by which an end portion of an anisotropic conductive film peels off. [Figure 10]1A to 1C are diagrams illustrating the mechanism by which an end portion of an anisotropic conductive film peels off. [Figure 11] 11A and 11B are diagrams illustrating an attachment error in a first electric wiring member having a first additional portion. [Figure 12] FIG. 13 is a diagram showing an electric wiring member of a comparative example. [Figure 13] FIG. 13 is a conceptual diagram showing a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] An electrical connection structure 100 according to one embodiment of the present invention will be described with reference to Figs. 1 to 12. The embodiment is merely an example of the present invention, and is not intended to limit the scope of the present invention to this embodiment. The following embodiment is directed to an electrical connection structure of an inkjet head that ejects ink, but the present invention can also be applied to an electrical connection structure of a liquid ejection head that ejects liquid other than ink. In the following description and drawings, the X direction is the longitudinal direction of the anisotropic conductive film 50, and the Y direction is the width direction of the anisotropic conductive film 50, or a direction parallel to the film surface of the anisotropic conductive film 50 and perpendicular to the X direction. The direction perpendicular to the X direction and the Y direction is called the Z direction.

[0010] (Configuration of liquid ejection head) FIG. 1 is a perspective view showing a main part of a liquid ejection head 1. The liquid ejection head 1 has an element substrate 2 that ejects a single color ink (black ink) and an element substrate 3 that ejects multiple colors of ink (color inks). The liquid ejection head has a support member 4 that is provided with an ink supply port (not shown) and supports the element substrates 2 and 3. The element substrates 2 and 3 are fixed to the support member 4 with each ejection port aligned with the ink supply port. A second electric wiring member 20 is fixed to the support member 4. The element substrates 2 and 3 are electrically connected to the second electric wiring member 20 by a method such as wire bonding or inner lead bonding. The electrical connection portion between the element substrates 2 and 3 and the support member 4 is sealed with sealing materials 5 and 6. The second electric wiring member 20 is a flexible wiring board. The second electric wiring member 20 is electrically and physically connected to the first electric wiring member 10 by an anisotropic conductive film (ACF (Anisotropic Conductive Film)) 50. The first electric wiring member 10 is a printed circuit board.

[0011] (Configuration of Electrical Connection Structure) Fig. 2(a) is a plan view showing a first electrical wiring member 10 and an anisotropic conductive film 50, and Fig. 2(b) is a partial plan view of a second electrical wiring member 20 viewed from the back side of the surface that contacts the anisotropic conductive film 50. Fig. 3(a) is a partial cross-sectional view showing an exploded view of the first electrical wiring member 10 and the anisotropic conductive film 50, and the second electrical wiring member 20. Fig. 3(b) is a partial cross-sectional view of an electrical connection structure 100 in which the first electrical wiring member 10 and the second electrical wiring member 20 are bonded with the anisotropic conductive film 50.

[0012] The first electric wiring member 10 has a plurality of leads (hereinafter referred to as first leads 30) having a convex shape. The first leads 30 are in contact with an edge 15 of the first electric wiring member 10 and are arranged in one direction (X direction) along the edge 15. Of the plurality of first leads 30, the first lead 30 located at one end in the one direction (X direction) is referred to as a first end lead 35, and the first lead 30 located at the other end is referred to as a second end lead 37. The second electric wiring member 20 has a plurality of leads (hereinafter referred to as second leads 40) having a convex shape. The second lead 40 is in contact with an edge 25 of the second electric wiring member 20 and is arranged in one direction (X direction) along the edge 25. The first electric wiring member 10 further has a first additional portion 60 and a second additional portion 80, which will be described later.

[0013] (Method of manufacturing the electrical connection structure 100) A method for manufacturing the electrical connection structure 100 will be described with reference to Figs. 2-3. First, as shown in Fig. 2(a), a substantially rectangular anisotropic conductive film 50 is attached to the first lead 30 so that one side is parallel to the edge 15 of the first electrical wiring member 10. Next, as shown in Fig. 3(a), the second electrical wiring member 20 is disposed above the anisotropic conductive film 50 so that each second lead 40 faces each first lead 30 to be connected. Then, the second electrical wiring member 20 is lowered until the second lead 40 contacts the anisotropic conductive film 50. Next, the anisotropic conductive film 50 is heated and pressed from above the second electrical wiring member 20 by a thermocompression tool (not shown). As shown in Fig. 3(b), a part of the anisotropic conductive film 50 at least partially fills the gaps between the first leads 30 and the second leads 40. The thermosetting resin in the anisotropic conductive film 50 is solidified by heating. Through the above process, the anisotropic conductive film 50 physically connects the first electrical wiring member 10 and the second electrical wiring member 20, and also electrically connects the first lead 30 and the second lead 40.

[0014] (Apparatus 200 for attaching anisotropic conductive film 50 and attachment method) FIG. 4 is a conceptual diagram showing the configuration of a bonding device 200 for an anisotropic conductive film 50. The bonding device 200 has a half-cut table 520, a half-cut blade 530, a bonding head 500, a plurality of guide rollers 540, 550, 570, 590, and a peeling roller 580. The anisotropic conductive film 50 is bonded to a separator film 600 to form a laminated film 605. The half-cut blade 530 is provided at a position facing the half-cut table 520. The half-cut blade 530 moves in the X direction to cut the anisotropic conductive film 50 across its entire width. The anisotropic conductive film 50 is cut across its entire thickness, but the separator film 600 is not cut. In the figure, a half-cut portion 560 directly above the first electrical wiring member 10 is shown. The bonding head 500 can move in the Z direction. The application head 500 applies heat and pressure to the laminated film 605 from above the separator film 600 , thereby applying the anisotropic conductive film 50 to the first lead 30 .

[0015] A conveyor 620 for transporting the first electrical wiring member 10 is provided below the application head 500. Guide rollers 540, 550, 570 move the laminated film 605 in the directions of arrows R1, R2, and R3, and guide it to a position directly above the first electrical wiring member 10. The peeling roller 580 cooperates with the guide roller 570 to peel the separator film 600 from the anisotropic conductive film 50 attached to the first electrical wiring member 10. Guide rollers 550, 570, 590 guide the separator film 600 separated from the anisotropic conductive film 50 in the directions of arrows R3, R4, and R5.

[0016] With reference to Fig. 5, the process of attaching the anisotropic conductive film 50 to the first electric wiring member 10 will be described. First, as shown in Fig. 5(a), the portion of the laminated film 605 to be attached (the portion sandwiched between the two half-cut portions 560 in Fig. 4) is transported below the attaching head 500. The first electric wiring member 10 is transported below the attaching head 500 by the conveyor 620 and remains stationary. Next, as shown in Fig. 5(b), the guide rollers 550, 570 and the peeling roller 580 are moved downward by a driving device (not shown), and the anisotropic conductive film 50 is placed on the first lead 30.

[0017] Next, as shown in FIG. 5(c), the application head 500 is moved downward until it comes into contact with the separator film 600. Thereafter, the application head 500 heats and presses the anisotropic conductive film 50 via the separator film 600. This causes the anisotropic conductive film 50 to be attached to the first lead 30. It is preferable that the heating and pressurization be performed for about 1 second. Thereafter, as shown in FIG. 5(d), the application head 500 is moved upward and separated from the separator film 600.

[0018] 5(e), the guide roller 570 and the peeling roller 580 move in the opposite direction to the conveying direction of the laminated film 605 while sandwiching the separator film 600. This causes the separator film 600 to be peeled off from the anisotropic conductive film 50. As shown in FIG. 5(f), when the movement of the guide roller 570 and the peeling roller 580 is completed, the separator film 600 is peeled off from the portion of the anisotropic conductive film 50 that is attached to the first lead 30.

[0019] Next, as shown in Fig. 5(g), the guide roller 570 and the peeling roller 580 are moved in the opposite direction and returned to their original positions. Prior to or in parallel with this operation, the guide rollers 550, 570 and the peeling roller 580 are moved upward to lift the separator film 600. Through the above steps, the attachment of the anisotropic conductive film 50 to one first electrical wiring member 10 is completed. Thereafter, the steps shown in Figs. 5(a) to 5(g) are repeated.

[0020] (Anisotropic conductive film application error) When the anisotropic conductive film 50 is attached by the process shown in FIG. 5, attachment errors in the X and Y directions may occur. FIG. 6 shows the attachment error in the X direction of the anisotropic conductive film 50. Normally, an attachment error EX of 0.2 mm occurs in the X direction. FIG. 6(a) shows the case where the anisotropic conductive film 50 is most displaced to the right, FIG. 6(b) shows the case where the attachment error is zero, and FIG. 6(c) shows the case where the anisotropic conductive film 50 is most displaced to the left. FIG. 7 shows the attachment error in the Y direction of the anisotropic conductive film 50. Normally, an attachment error EY of 0.15 mm occurs in the Y direction. FIG. 7(a) shows the case where the anisotropic conductive film 50 is most displaced to the front side, FIG. 7(b) shows the case where the attachment error is zero, and FIG. 7(c) shows the case where the anisotropic conductive film 50 is most displaced to the back side. However, since the length of the first lead 30 in the Y direction is generally greater than the width of the anisotropic conductive film 50 in the Y direction, the attachment error in the Y direction does not pose a significant problem.

[0021] (Peeling of anisotropic conductive film) The anisotropic conductive film 50 attached to the first electric wiring member 10 may peel off from the first electric wiring member 10 when the separator film 600 is peeled off. FIG. 8 is a side view showing the state of the end of the anisotropic conductive film 50. FIGS. 8(a) and 8(b) show the case where the thickness t1 of the first lead 30 is about 40 μm. FIGS. 8(c) and 8(d) show the case where the thickness t2 of the first lead 30 is about 80 μm. FIGS. 8(a) and 8(c) correspond to FIG. 6(a), and FIGS. 8(b) and 8(d) correspond to FIG. 6(c). The thickness of the first lead 30 depends on the required performance of the liquid ejection head 1. A large amount of power is required to achieve high-precision and high-speed printing, but increasing the width of the first lead 30 affects the size of the liquid ejection head 1. For this reason, the thickness of the first lead 30 may be increased to accommodate the increase in power.

[0022] As shown in FIG. 8(a) and FIG. 8(c), when the end of the anisotropic conductive film 50 is on the first lead 30, the possibility of the anisotropic conductive film 50 peeling off is low. In contrast, as shown in FIG. 8(b) and FIG. 8(d), when the end of the anisotropic conductive film 50 protrudes from the first lead 30, the anisotropic conductive film 50 is likely to peel off from the end. When the thickness of the first lead 30 is small, the end of the anisotropic conductive film 50 hangs down from the first lead 30 and is attached to the first electrical wiring member 10. However, when the adhesion to the first electrical wiring member 10 is insufficient, the anisotropic conductive film 50 is likely to peel off from the end. When the thickness of the first lead 30 is large, the end of the anisotropic conductive film 50 hangs down from the first lead 30, but does not contact the first electrical wiring member 10, or even if it does contact, the contact area is reduced. Therefore, the anisotropic conductive film 50 becomes more likely to peel off starting from the end portion. This problem is likely to occur when the thickness of the first lead 30 is greater than the thickness of the anisotropic conductive film 50, and is more likely to occur when the thickness of the first lead 30 is 1.2 times the thickness of the anisotropic conductive film 50 or more.

[0023] FIG. 9(a) shows a schematic mechanism of peeling the anisotropic conductive film 50 from the first electrical wiring member 10 at the peeling starting point side of the separator film 600. If the adhesion of the end of the anisotropic conductive film 50 is insufficient, the anisotropic conductive film 50 is pulled upward together with the separator film 60 when the separator film 600 is peeled by the peeling roller 580 and the guide roller 570 in the process of moving from FIG. 5(d) to FIG. 5(e). As a result, as shown in FIG. 9(b), the anisotropic conductive film 50 is peeled off from the first electrical wiring member 10. As shown in FIG. 9(c), the anisotropic conductive film 50 may peel off from the multiple first leads 30 as the peeling progresses.

[0024] FIG. 10 shows a schematic mechanism of the anisotropic conductive film 50 being peeled off from the first electrical wiring member 10 at the peel end point side of the separator film 60. As described above, since the anisotropic conductive film 50 is cut in advance, the anisotropic conductive film 50 attached to the first electrical wiring member 10 is separated from the subsequent anisotropic conductive film 50 in the process of moving from FIG. 5(f) to FIG. 5(g). However, the cut portion of the anisotropic conductive film 50 may reattach to the subsequent anisotropic conductive film 50 in the heating and pressurizing process shown in FIG. 5(c). As shown in FIG. 10(a), the anisotropic conductive film 50 reattached to the subsequent anisotropic conductive film 50 at the half-cut portion 560 is transported to the left together with the subsequent anisotropic conductive film 50 and peeled off from the first electrical wiring member 10. As shown in FIG. 10(b), as the separator film 600 is transported, the area where the anisotropic conductive film 50 is peeled off from the first electrical wiring member 10 expands.

[0025] (Configuration of additional part) FIG. 11 shows a partial plan view of the first electric wiring member 10. The first additional portion 60 is provided on the starting point side for peeling off the separator film 600. The first additional portion 60 has a plurality of first teeth 62 (three in this embodiment). The first teeth 62 are substantially rectangular parallelepiped members having a substantially rectangular shape when viewed from the Z direction. The first teeth 62 extend substantially parallel to the X direction. The first teeth 62 are preferably made of the same material as the first lead 30. This makes it easier to manufacture the first electric wiring member 10. In this embodiment, the first teeth 62 are integrally formed with the first end lead 35. The thickness of the first additional portion 60 (first teeth 62) is preferably equal to the thickness of the first end lead 35. More specifically, the effect of the present invention can be suitably obtained if the thickness of the first additional portion 60 (first teeth 62) is 80% or more and 120% or less of the thickness of the first end lead 35. This improves the adhesion of the anisotropic conductive film 50 to the first additional portion 60 and the first end lead 35, making the anisotropic conductive film 50 less likely to peel off.

[0026] The second addition portion 80 is provided on the end point side where the separator film 600 is peeled off. As shown in FIG. 2(a), the second addition portion 80 has a plurality of (three in this embodiment) third teeth 83. The third teeth 83 contact the second end lead 37 in the X direction. The configuration of the second addition portion 80 is similar to that of the first addition portion 60, and is in a mirror symmetrical relationship with the first addition portion 60 in the Y direction. For a specific structure, please refer to the description of the first addition portion 60. In the case of a bonding device 200 in which the peeling roller 580 is on the left side as shown in FIG. 4, the anisotropic conductive film 50 is more likely to peel off at the peeling start point side of the separator film 600, so the second addition portion 80 can be omitted. However, since the end where peeling is likely to occur may change depending on the bonding device, the first addition portion 60 can be omitted.

[0027] The first additional portion 60 and the second additional portion 80 have an X-direction dimension (0.2 mm in this embodiment) that is at least equal to the attachment error. FIG. 11(a) shows a case where the anisotropic conductive film 50 is most displaced to the right, and FIG. 11(b) shows a case where the anisotropic conductive film 50 is most displaced to the left. In this embodiment, the first additional portion 60 contacts the first end lead 35 in the X direction, and the second additional portion 80 contacts the second end lead 37 in the X direction. Therefore, no matter where the end of the anisotropic conductive film 50 is located within the range of the attachment error in the X direction, one end of the anisotropic conductive film 50 is on the first additional portion 60, and the other end is on the second additional portion 80. In other words, it is possible to avoid a state where the end of the anisotropic conductive film 50 is floating in the air over the entire width.

[0028] FIG. 12 shows a comparative example in which a dummy lead is provided on the side of the first lead 30 as described in Patent Document 1. The dummy lead 65 is spaced apart from the first lead 30. Therefore, when the end of the anisotropic conductive film 50 is located between the dummy lead 65 and the first lead 30 as shown in the figure, the end of the anisotropic conductive film 50 floats in the air over its entire width and is likely to peel off from the first electrical wiring member 10. Since the dummy lead 65 has a lattice shape when viewed from the Z direction, air trapped inside the lattice may expand when the second electrical wiring member 20 is heat-bonded, which may affect the bonding. Since the first additional portion 60 and the second additional portion 80 of this embodiment do not form a sealed portion, such a problem is unlikely to occur.

[0029] (Modification) The shapes of the first additional portion 60 and the second additional portion 80 are not limited to those in the first embodiment. Below, a modified example of the first additional portion 60 will be described, but the same applies to the second additional portion 80. Also, configurations and effects that are not described are similar to those in the first embodiment. Referring to FIG. 13(a), the additional portion 90 has a plurality of first teeth 62 (six in this embodiment) that are substantially parallelogram-shaped when viewed from the Z direction. The plurality of first teeth 62 extend in a direction inclined from the X direction. The direction in which the first teeth 62 incline from the X direction is not limited to the example in FIG. 13(a), and may be downward to the left from the connection portion with the first end lead 35.

[0030] Referring to FIG. 13(b), the first additional portion 60 has a first auxiliary additional portion 110 located on the opposite side of the first end lead 35 with respect to the first tooth portion 62. The first auxiliary additional portion 110 has a strip portion 120 extending parallel to the first end lead 35, and a plurality of second tooth portions 140 each contacting the first strip portion 120. The plurality of first tooth portions 62 and the plurality of second tooth portions 140 are alternately arranged in the Y direction and partially overlap when viewed from the Y direction. Therefore, no matter where the end of the anisotropic conductive film 50 is located within the range of attachment error in the X direction, the end of the anisotropic conductive film 50 contacts the first additional portion 60. Although not shown, an auxiliary additional portion having a shape similar to that of the first auxiliary additional portion 110 can also be provided on the second end lead 37 side. Referring to FIG. 13(c), the first tooth portion 62 and the second tooth portion 140 are substantially triangular, and the rest is similar to the modified example shown in FIG. 13(b).

[0031] The present disclosure includes the following compositions and methods. [Configuration 1] a plurality of first leads arranged in one direction along an edge of the first electrical wiring member and having a convex shape; a plurality of second leads arranged in the one direction along an edge of the second electrical wiring member, each of the second leads facing a corresponding one of the first leads; an anisotropic conductive film located between the first leads and the second leads, electrically connecting the first leads and the second leads corresponding to each other; the plurality of first leads include a first end lead located at one end in the one direction; An electrical connection structure, wherein the first electrical wiring member has a first additional portion having a convex shape, at least a portion of which contacts the first end lead in the one direction. [Configuration 2] 2. The electrical connection structure according to configuration 1, wherein the thickness of the first additional portion is 80% or more and 120% or less of the thickness of the first end lead. [Configuration 3] 3. The electrical connection structure according to configuration 1 or 2, wherein the first additional portion and the plurality of first leads are made of the same material. [Configuration 4] 4. The electrical connection structure of any one of configurations 1 to 3, wherein the first attachment portion has a plurality of first teeth each contacting a first end lead. [Configuration 5] 5. The electrical connection structure of claim 4, wherein the first teeth extend substantially parallel to the one direction. [Configuration 6] 5. The electrical connection structure of claim 4, wherein the plurality of first teeth extend in a direction inclined from the one direction. [Configuration 7] 7. The electrical connection structure of any one of configurations 4 to 6, wherein the first tooth portion is substantially rectangular. [Configuration 8] 7. The electrical connection structure of any one of configurations 4 to 6, wherein the first tooth portion is substantially triangular. [Configuration 9] the first extension has a first auxiliary extension located on an opposite side of the first end lead with respect to the first tine; The electrical connection structure described in any one of structures 4 to 8, wherein the first auxiliary addition portion has a first band-shaped portion extending parallel to the first end lead and a plurality of second tooth portions each contacting the first band-shaped portion, the plurality of first tooth portions and the plurality of second tooth portions being arranged alternately and parallel to the anisotropic conductive film and partially overlapping when viewed from a direction perpendicular to the one direction. [Configuration 10] the plurality of first leads having a second end lead located at an end opposite the first end lead; The electrical connection structure according to configuration 1, wherein the first electrical wiring member has a second additional portion having a convex shape, at least a portion of which contacts the second end lead in the one direction. [Configuration 11] 11. The electrical connection structure according to any one of configurations 1 to 10, wherein the first electrical wiring member is a printed circuit board, and the second electrical wiring member is a flexible wiring board. [Configuration 12] A liquid ejection head comprising the electrical connection structure according to any one of configurations 1 to 11. [Configuration 13] 13. The liquid ejection head according to configuration 12, wherein the thickness of the first lead is greater than the thickness of the anisotropic conductive film. [Method 1] disposing a laminated film, in which an anisotropic conductive film and a separator film are laminated, on a first electrical wiring member such that the anisotropic conductive film is in contact with the first electrical wiring member; peeling off the separator film from the anisotropic conductive film disposed on the first electrical wiring member; and disposing a second electrical wiring member on the anisotropic conductive film from which the separator film has been peeled off, a plurality of first leads each having a convex shape are arranged in one direction along an edge of the first electrical wiring member, a plurality of second leads each having a convex shape are arranged in the one direction along an edge of the second electrical wiring member, and the second electrical wiring member is disposed such that each of the plurality of first leads faces a corresponding one of the second leads; the plurality of first leads have a first end lead located at one end in the one direction, and the first electrical wiring member has a first convex-shaped additional portion at least a portion of which contacts the first end lead in the one direction; A method for manufacturing an electrical connection structure, wherein the anisotropic conductive film is positioned so that one end in the one direction is located on either the first end lead or the first additional portion. [Method 2] The method for manufacturing an electrical connection structure described in Method 1, wherein the anisotropic conductive film in the laminated film is approximately rectangular, and one side of the anisotropic conductive film is approximately parallel to the edge of the first electrical wiring member. [Method 3] 3. The method for producing an electrical connection structure according to method 1 or 2, wherein the first additional portion is provided on the starting point side for peeling off the separator film. [Explanation of symbols]

[0032] 10 First electric wiring member 20 Second electrical wiring member 30 First Lead 40 First Lead 50 Anisotropic conductive film 60 First additional part

Claims

1. a plurality of first leads arranged in one direction along an edge of the first electrical wiring member and having a convex shape; a plurality of second leads arranged in the one direction along an edge of the second electrical wiring member, each of the second leads facing a corresponding one of the first leads; an anisotropic conductive film located between the first leads and the second leads, electrically connecting the first leads and the second leads corresponding to each other; the plurality of first leads include a first end lead located at one end in the one direction; An electrical connection structure, wherein the first electrical wiring member has a first additional portion having a convex shape, at least a portion of which contacts the first end lead in the one direction.

2. 2. The electrical connection structure according to claim 1, wherein the thickness of the first additional portion is 80% or more and 120% or less of the thickness of the first end lead.

3. 2. The electrical connection structure according to claim 1, wherein the first additional portion and the first leads are made of the same material.

4. 2. The electrical connection structure according to claim 1, wherein the first attachment portion has a plurality of first teeth each of which contacts a first end lead.

5. The electrical connection structure according to claim 4 , wherein the plurality of first teeth extend substantially parallel to the one direction.

6. The electrical connection structure according to claim 4 , wherein the first teeth extend in a direction inclined from the one direction.

7. The electrical connection structure according to claim 4 , wherein the first tooth portion is substantially rectangular.

8. The electrical connection structure according to claim 4 , wherein the first tooth portion is substantially triangular.

9. the first extension has a first auxiliary extension located on an opposite side of the first end lead with respect to the first tine; 5. The electrical connection structure described in claim 4, wherein the first auxiliary addition portion has a first band portion extending parallel to the first end lead and a plurality of second tooth portions each contacting the first band portion, the plurality of first tooth portions and the plurality of second tooth portions being arranged alternately and being parallel to the anisotropic conductive film and partially overlapping when viewed from a direction perpendicular to the one direction.

10. the plurality of first leads have a second end lead located at an end opposite the first end lead; 2. The electrical connection structure according to claim 1, wherein the first electrical wiring member has a second additional portion having a convex shape, at least a portion of which contacts the second end lead in the one direction.

11. 2. The electrical connection structure according to claim 1, wherein the first electrical wiring member is a printed circuit board, and the second electrical wiring member is a flexible wiring board.

12. A liquid ejection head comprising the electrical connection structure according to claim 1 .

13. The liquid ejection head according to claim 12 , wherein the thickness of the first lead is greater than the thickness of the anisotropic conductive film.

14. disposing a laminated film, in which an anisotropic conductive film and a separator film are laminated, on a first electrical wiring member such that the anisotropic conductive film is in contact with the first electrical wiring member; peeling the separator film from the anisotropic conductive film disposed on the first electrical wiring member; and disposing a second electrical wiring member on the anisotropic conductive film from which the separator film has been peeled off, a plurality of first leads each having a convex shape are arranged in one direction along an edge of the first electrical wiring member, a plurality of second leads each having a convex shape are arranged in the one direction along an edge of the second electrical wiring member, and the second electrical wiring member is disposed such that each of the plurality of first leads faces a corresponding one of the second leads; the first leads have a first end lead located at one end in the one direction, and the first electrical wiring member has a first convex-shaped additional portion at least a portion of which contacts the first end lead in the one direction; The method for manufacturing an electrical connection structure, wherein the anisotropic conductive film is positioned so that one end in the one direction is located on the first additional portion.

15. The method for manufacturing an electrical connection structure according to claim 14 , wherein the anisotropic conductive film in the laminated film is substantially rectangular, and one side of the anisotropic conductive film is substantially parallel to the edge of the first electrical wiring member.

16. The method for manufacturing an electrical connection structure according to claim 14 , wherein the first additional portion is provided on a starting point side for peeling off the separator film.

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