Flat cable

Abstract

To provide a flat cable capable of suppressing detachment of two sheet-shaped electrodes fixed and overlapped, even when the electrodes are folded.SOLUTION: A flat cable 1 comprises two sheet-shaped electrodes 10 which are formed in a belt shape. The sheet-shaped electrode 10 has; a first part 11, a second part 12 and a third part 13 arranged in this order in a longitudinal direction of the sheet-shaped electrode 10. On the first and third parts 11, 13, the two sheet-shaped electrodes 10 are overlapped and fixed in a thickness direction of the sheet-shaped electrode 10, and on the second part 12, the two sheet-shaped electrodes 10 are adjacently arranged in a width direction of the sheet-shaped electrode 10.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a flat cable. [Background technology]

[0002] Patent Document 1 discloses a flat cable in which two strip-shaped sheet-type electrodes are stacked and fixed in the thickness direction of the sheet-type electrodes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] U.S. Patent No. 6,242,683 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when such a flat cable is bent in the thickness direction of the sheet-type electrodes, the sheet-type electrode located radially inside the bent portion of the flat cable is compressed, while the sheet-type electrode located radially outside the bent portion is expanded. This causes stress between the two fixed sheet-type electrodes, which can cause the two sheet-type electrodes to peel off. Furthermore, if the flat cable includes a vibration sensor (pickup) with a piezoelectric element between the two sheet-type electrodes, there is a risk that the sheet-type electrode will peel off from the piezoelectric element when the flat cable is bent.

[0005] The present invention has been made in view of the above circumstances, and has an object to provide a flat cable that can prevent two sheet-type electrodes from peeling off even when bent. [Means for solving the problem]

[0006] One aspect of the present invention provides a flat cable including at least two sheet-like electrodes formed in a strip shape, the sheet-like electrodes having a first portion, a second portion, and a third portion arranged in order in the longitudinal direction of the sheet-like electrodes, wherein in the first portion and the third portion, the two sheet-like electrodes are fixed by overlapping each other in the thickness direction of the sheet-like electrodes, and in the second portion, the two sheet-like electrodes are arranged adjacent to each other in the width direction of the sheet-like electrodes.

Advantages of the Invention

[0007] According to the present invention, peeling of the two sheet-like electrodes can be suppressed even when the flat cable is bent.

Brief Description of the Drawings

[0008] [Figure 1] FIG. 1 is a plan view of a flat cable according to an embodiment of the present invention as viewed from the thickness direction of the sheet-like electrodes. [Diagram 2] FIG. 2 is an enlarged plan view showing a second portion of the sheet-like electrode and its vicinity in the flat cable of FIG. 1. [Figure 3] FIG. 3 is a plan view showing a state in which the flat cable of FIG. 1 is disassembled into two sheet-like electrodes. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 1. [Figure 5] FIG. 5 is a cross-sectional view taken along line V-V of FIG. 1. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 1. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 1. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 1. [Figure 9] FIG. 9 is a perspective view showing an example of a stringed instrument to which the flat cable according to the present invention is applied. [Figure 10] FIG. 10 is a cross-sectional view showing a main part of the stringed instrument of FIG. 1. [Figure 11] FIG. 11 is a cross-sectional view taken along line XI-XI of FIG. 2. [Figure 12]FIG. 10 is a plan view of a flat cable according to another embodiment of the present invention, showing a state before two sheet-type electrodes are overlapped. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3, the flat cable 1 includes two strip-shaped sheet-type electrodes 10 (10A, 10B). In the following description, one of the two sheet-type electrodes 10A may be referred to as the first sheet-type electrode 10A, and the other sheet-type electrode 10B may be referred to as the second sheet-type electrode 10B.

[0010] Each sheet-type electrode 10 is bendable in its thickness direction. Each sheet-type electrode 10 has a first portion 11, a second portion 12, and a third portion 13, which are arranged in this order in the longitudinal direction of the sheet-type electrode 10. The first sheet-type electrode 10A also has an extension portion 14 that extends further in the longitudinal direction from the third portion 13. As shown in FIGS. 4, 6, and 7, in the first portion 11 and the third portion 13, two sheet-type electrodes 10 are fixed in a stacked manner in the thickness direction of the sheet-type electrode 10. As shown in FIGS. 2 and 5, in the second portion 12, two sheet-type electrodes 10 are arranged adjacent to each other in the width direction of the sheet-type electrode 10, and the two sheet-type electrodes 10 do not overlap in the thickness direction.

[0011] 1 to 8, the longitudinal direction of the sheet-type electrode 10 is indicated as the X-axis direction, and the width direction of the sheet-type electrode 10 is indicated as the Y-axis direction. The thickness direction of the sheet-type electrode 10 is indicated as the Z-axis direction. In the following description, the positive Y-axis side (+Y side) may be referred to as the right side, and the negative Y-axis side (-Y side) may be referred to as the left side. The positive Z-axis side (+Z side) may be referred to as the upper side, and the negative Z-axis side (-Z side) may be referred to as the lower side. In this embodiment, the first sheet-type electrode 10A is disposed on the lower side, and the second sheet-type electrode 10B is disposed on the upper side of the first sheet-type electrode 10A.

[0012] As shown in FIG. 2, the total width dimension W2t of the two sheet-type electrodes 10 in the second portion 12 is equal to or less than the width dimensions W1 and W3 of the sheet-type electrodes 10 in the first portion 11 and the third portion 13. The sheet-type electrodes 10 in the second portion 12 do not protrude outward from the ends in the width direction of the sheet-type electrodes 10 in the first portion 11 and the third portion 13.

[0013] Specifically, the width dimensions W1 and W3 of the two sheet-type electrodes 10 in the first portion 11 and the third portion 13 are equal to each other. Also, the width dimension of the extension portion 14 of the first sheet-type electrode 10A is equal to the width dimension W3 of the sheet-type electrode 10 in the third portion 13. On the other hand, the width dimensions of the two sheet-type electrodes 10 in the second portion 12 are approximately half of the width dimensions W1 and W3 of the sheet-type electrodes 10 in the first and third portions 11 and 13, respectively. As a result, the total width dimension W2t of the two sheet-type electrodes 10 in the second portion 12 is equal to the width dimensions W1 and W3 of the sheet-type electrodes 10 in the first portion 11 and the third portion 13.

[0014] Also, in the first sheet-type electrode 10A, its second portion 12 is arranged close to the right ends of the first portion 11 and the third portion 13. Also, in the first sheet-type electrode 10A, its second portion 12 does not protrude outward from the right ends of the first portion 11 and the third portion 13. On the other hand, in the second sheet-type electrode 10B, its second portion 12 is arranged close to the left ends of the first portion 11 and the third portion 13. Also, in the second sheet-type electrode 10B, its second portion 12 does not protrude outward from the left ends of the first portion 11 and the third portion 13. As a result, in a state where the two sheet-type electrodes 10 are stacked in the thickness direction, the second portion 12 does not protrude outward from the ends of the first portion 11 and the third portion 13 in the width direction.

[0015] As shown in FIG. 4, the flat cable 1 of the present embodiment is used for a piezoelectric sensor 30 having a piezoelectric element 25. The piezoelectric element 25 is arranged between the two sheet-type electrodes 10 in the first portion 11. The piezoelectric sensor 30 is composed of the two sheet-type electrodes 10 and the piezoelectric element 25, and converts pressure fluctuations such as vibrations into electrical signals.

[0016] Hereinafter, the flat cable 1 of the present embodiment will be described in more detail. As shown in FIGS. 4 to 8, the two sheet-type electrodes 10 constituting the flat cable 1 each include a sheet base material 21, an electrical wiring 22, a ground wiring 23, and a resist 24.

[0017] The sheet base material 21 is a flexible strip-shaped sheet material extending in the longitudinal direction. The sheet base material 21 may be made of a material having electrical insulation properties, such as polyethylene terephthalate (PET) for example. The planar shape of the sheet base material 21 as viewed in the thickness direction corresponds to the planar shape of each sheet-type electrode 10 as viewed in the thickness direction (the shapes shown in FIGS. 1 to 3). The electrical wiring 22 is made of a conductive material and is provided on the first surface 211 side in the thickness direction of the sheet base material 21 and extends in the longitudinal direction. The electrical wiring 22 functions as an electrode connected to the piezoelectric element 25 in the first portion 11. In the present embodiment, an electrical signal output from the piezoelectric element 25 flows through the electrical wiring 22.

[0018] The ground wiring 23 is provided on the first surface 211 side of the sheet base material 21 and functions as a shield for electromagnetically protecting the electrical wiring 22. The ground wiring 23 prevents or suppresses, for example, electromagnetic noise from reaching the electrical wiring 22 from the outside. The resist 24 is provided on the first surface 211 side of the sheet base material 21 and mainly electrically insulates the electrical wiring 22 and the ground wiring 23 provided on the same sheet-type electrode 10. Further, the resist 24 electrically insulates the ground wirings 23 provided on the same sheet-type electrode 10 or the electrical wirings 22 from each other.

[0019] The arrangement of the electrical wiring 22 and the ground wiring 23 on the first surface 211 of the sheet base material 21 varies depending on the position of the sheet-type electrode 10 in the longitudinal direction and also varies between the two sheet-type electrodes 10. Hereinafter, this point will be mainly described.

[0020] As shown in FIG. 4, in the first portion 11 of each sheet-type electrode 10, a ground wiring 23 and an electrical wiring 22 are sequentially laminated on the first surface 211 of the sheet base material 21. The ground wiring 23 and the electrical wiring 22 are electrically insulated by a resist 24 interposed therebetween. The width dimension of the electrical wiring 22 in the first portion 11 is smaller than the width dimensions of the sheet base material 21 and the ground wiring 23. Both ends of the electrical wiring 22 in the width direction are located inside both ends of the sheet base material 21 and the ground wiring 23 in the width direction.

[0021] In the first portion 11, two sheet-type electrodes 10 are fixed to each other such that the first surfaces 211 of the sheet base materials 21 of the two sheet-type electrodes 10 face each other, and such that the electrical wirings 22 of the two sheet-type electrodes 10 are electrically insulated. In the present embodiment, the two sheet-type electrodes 10 are fixed to each other with a piezoelectric element 25 sandwiched therebetween. The electrical wiring 22 of each sheet-type electrode 10 and the piezoelectric element 25 are adhesively fixed by an anisotropic conductive adhesive 26. The piezoelectric sensor 30 is constituted by the piezoelectric element 25 and the electrical wirings 22 of the two sheet-type electrodes 10.

[0022] As shown in FIG. 5, in the second portion 12 of each sheet-type electrode 10, a first ground wiring 23, an electrical wiring 22, and a second ground wiring 23 are sequentially laminated on the first surface 211 of the sheet base material 21. Also, ground wirings 23 are arranged on both sides of the electrical wiring 22 in the width direction. Thereby, the electrical wiring 22 of each sheet-type electrode 10 is surrounded by the ground wirings 23. These a plurality of ground wirings 23 and electrical wirings 22 are electrically insulated by a resist 24 interposed therebetween. Also, the resist 24 is laminated on the second ground wiring 23 as well, suppressing the second ground wiring 23 from being exposed to the outside. The width dimension of the electrical wiring 22 in the second portion 12 is smaller than the width dimension of the sheet base material 21 and the width dimension of the ground wiring 23 that overlaps the electrical wiring 22 in the thickness direction. Both ends of the electrical wiring 22 in the width direction are located inside both ends of the sheet base material 21 and the ground wiring 23 in the width direction. In the second part 12, the two sheet-type electrodes 10 are positioned with a displacement in the width direction in a state where the first surfaces 211 of the sheet base materials 21 of the two sheet-type electrodes 10 face in opposite directions in the thickness direction.

[0023] As shown in FIGS. 6 and 7, in the third part 13 of the two sheet-type electrodes 10, similar to the first part 11, the two sheet-type electrodes 10 are fixed to each other such that the first surfaces 211 of the sheet base materials 21 of the two sheet-type electrodes 10 face each other. However, in the third part 13, the two sheet-type electrodes 10 are directly fixed by an adhesive 27. The adhesive 27 has electrical insulation properties. The third part 13 is configured such that the electrical wiring 22 and the ground wiring 23 of the two sheet-type electrodes 10 are aggregated in the first sheet-type electrode 10A. In the third part 13 of the two sheet-type electrodes 10, as shown in FIG. 6, there is a part where the second electrical wiring 22B of the second sheet-type electrode 10B is transferred to the first sheet-type electrode 10A, and as shown in FIG. 7, there is a part where the ground wiring 23 of the second sheet-type electrode 10B is transferred to the first sheet-type electrode 10A. These two parts are positioned with a displacement in the longitudinal direction with respect to each other.

[0024] As shown in FIG. 6, in the third part 13, in the part where the second electrical wiring 22B of the second sheet-type electrode 10B is transferred to the first sheet-type electrode 10A, similar to the second part 12, the first electrical wiring 22A of the first sheet-type electrode 10A is arranged so as to be surrounded by the ground wiring 23. The second electrical wiring 22B of the second sheet-type electrode 10B is arranged so as to be surrounded by the ground wiring 23, but is exposed on the side of the first sheet-type electrode 10A in the thickness direction. Further, on the first sheet-type electrode 10A, an electrical wiring 22 (second electrical wiring 22B) connected to the second electrical wiring 22B of the second sheet-type electrode 10B is formed in the same layer as the first electrical wiring 22A. The second electrical wiring 22B formed on the first sheet-type electrode 10A is exposed on the side of the second sheet-type electrode 10B so as to face the second electrical wiring 22B of the second sheet-type electrode 10B in the thickness direction. Then, the second electrical wirings 22B formed on the opposing first and second sheet-type electrodes 10A and 10B are electrically connected by the connection member 28. Thereby, the second electrical wiring 22B of the second sheet-type electrode 10B is transferred to the first sheet-type electrode 10A. That is, the first and second electrical wirings 22A and 22B are aggregated on the first sheet-type electrode 10A.

[0025] FIG. 7 shows a portion of the third section 13 where the ground wiring 23 of the second sheet-type electrode 10B is transferred to the first sheet-type electrode 10A. This portion is located further longitudinally from the second section 12 than the portion where the second electrical wiring 22B is transferred from the second sheet-type electrode 10B to the first sheet-type electrode 10A (see FIG. 1). As shown in FIG. 7, in the portion where the ground wiring 23 of the second sheet-type electrode 10B is transferred to the first sheet-type electrode 10A, the first electrical wiring 22A and the second electrical wiring 22B provided on the first sheet-type electrode 10A are aligned in the width direction while being electrically insulated from each other. Furthermore, the first electrical wiring 22A and the second electrical wiring 22B are surrounded by the ground wiring 23 and are not exposed outside the first sheet-type electrode 10A. Specifically, the first ground wiring 23, the first electrical wiring 22A and the second electrical wiring 22B, and the second ground wiring 23 are stacked in this order on the first surface 211 of the sheet substrate 21. Furthermore, ground wiring 23 is also arranged on both sides of the first electrical wiring 22A and the second electrical wiring 22B in the width direction. Only the ground wiring 23 remains on the second sheet-type electrode 10B.

[0026] 7, the ground wiring 23 of the first sheet electrode 10A is exposed on the second sheet electrode 10B side in the thickness direction. The ground wiring 23 of the second sheet electrode 10B is exposed on the first sheet electrode 10A side so as to face the ground wiring 23 of the first sheet electrode 10A in the thickness direction. The opposing ground wiring 23 of the first and second sheet electrodes 10A and 10B is electrically connected by a connecting member 29. This moves the ground wiring 23 of the second sheet electrode 10B to the first sheet electrode 10A. That is, the ground wiring 23 is consolidated in the first sheet electrode 10A.

[0027] As shown in FIG. 8, in an extension portion 14 that further extends in the longitudinal direction from the third portion 13 of the first sheet-type electrode 10A, a first electrical connection line and a second electrical wiring 22B that are aggregated in the first sheet-type electrode 10A in the third portion 13 extend in the longitudinal direction, respectively. That is, the extension portion 14 includes a first electrical wiring 22A and a second electrical wiring 22B. In the extension portion 14, similar to the third portion 13 of the first sheet-type electrode 10A, a first electrical wiring 22A, a second electrical wiring 22B, and a ground wiring 23 are arranged. That is, also in the extension portion 14, the first electrical wiring 22A and the second electrical wiring 22B are surrounded by the ground wiring 23. These first electrical wiring 22A, second electrical wiring 22B, and a plurality of ground wirings 23 are electrically insulated by a resist 24 interposed therebetween. Further, in the extension portion 14, the resist 24 covers the ground wiring 23 so that the ground wiring 23 is not exposed to the outside.

[0028] As shown in FIGS. 1 and 3, at the tip of the extension portion 14 in the extension direction, a connection terminal 15 for connecting the first electrical wiring 22A, the second electrical wiring 22B, and the ground wiring 23 to a device (not shown) is provided.

[0029] In the flat cable 1 of the present embodiment configured as described above, two sheet-type electrodes 10 are not fixed to each other in the second portion 12 and are arranged adjacent to each other in the width direction of the sheet-type electrode 10. For this reason, when the flat cable 1 is bent in the thickness direction of the sheet-type electrode 10 in the second portion 12, the two sheet-type electrodes 10 bend independently so as not to interfere with each other. Thereby, it is possible to suppress the generation of stress between the two sheet-type electrodes 10 fixed to each other in the first portion 11 and the third portion 13 due to the bending of the flat cable 1. Therefore, even when the flat cable 1 is bent, it is possible to suppress the peeling of the two sheet-type electrodes 10 in the first portion 11 and the third portion 13.

[0030] Further, in the flat cable 1 of the present embodiment, the total width dimension W2t of the two sheet-type electrodes 10 in the second portion 12 is equal to or less than the respective width dimensions W1 and W3 of the two sheet-type electrodes 10 in the first portion 11 and the third portion 13. Therefore, it is possible to prevent the width dimension W2t of the flat cable 1 in the second portion 12 from becoming larger than the width dimensions W1 and W3 of the flat cable 1 in the first portion 11 and the third portion 13. As a result, the handleability of the flat cable 1 can be improved as compared with the case where the width dimension W2t of the second portion 12 is larger than the width dimensions W1 and W3 of the first portion 11 and the third portion 13.

[0031] Further, in the flat cable 1 of the present embodiment, in the third portion 13, the electrical wirings 22 of the two sheet-type electrodes 10 are aggregated into the first sheet-type electrode 10A, and the extension portion 14 of the first sheet-type electrode 10A extending further from the third portion 13 includes the aggregated electrical wirings 22. Thereby, the thickness of the flat cable 1 extending further from the third portion 13 can be reduced. Specifically, the thickness of the flat cable 1 extending further from the third portion 13 can be made equal to the thickness of one sheet-type electrode 10. Further, in the extension portion 14 of the flat cable 1, since the two sheet-type electrodes 10 are not overlapped and fixed like the first portion 11 and the third portion 13, the flat cable 1 has excellent flexibility as compared with the first portion 11 and the third portion 13.

[0032] Further, the flat cable 1 of the present embodiment includes a piezoelectric element 25 disposed between the two sheet-type electrodes 10 in the first portion 11. Thereby, a piezoelectric sensor 30 that converts pressure fluctuations such as vibrations into electrical signals can be configured by the two sheet-type electrodes 10 and the piezoelectric element 25.

[0033] The piezoelectric sensor 30 including the two sheet-type electrodes 10 (i.e., the flat cable 1) can be used, for example, in the guitar 100 (stringed instrument) shown in FIGS. 9 to 11. Specifically, the piezoelectric sensor 30 can be used as a guitar pickup that detects the vibration of the string 103. This will be described below.

[0034] The guitar 100 shown in FIG. 9 has a body 101, a neck 102 extending from the body 101, and strings 103 stretched between the body 101 and the tip of the neck 102. The first end of the string 103 is fixed to the bridge 105 of the body 101, and the second end of the string 103 is wound by a winder 104 provided at the tip of the neck 102. As shown in FIGS. 10 and 11, the string 103 is supported by a saddle 107 that fits into a groove 106 formed in the bridge 105 of the body 101. The saddle 107 supports the string 103 on the first end side of the string 103.

[0035] The first portion 11 of the flat cable 1 configured as the piezoelectric sensor 30 is disposed between the bottom surface of the groove 106 of the body 101 and the saddle 107. The flat cable 1 is also drawn out to the outside of the groove 106 in order to connect the piezoelectric sensor 30 to a device (not shown) disposed outside the groove 106. Specifically, the third portion 13 of the flat cable 1 is inserted into a hole 108 that opens and extends in the bottom surface of the groove 106, so that the third portion 13 and the extension portion 14 (see FIGS. 1 and 3) are drawn out to the outside of the groove 106. Then, the connection terminal 15 of the extension portion 14 is connected to a device (not shown).

[0036] Here, the direction in which the bottom surface of the groove 106 extends and the direction in which the hole 108 continuous with the groove 106 extends are different from each other. For this reason, the flat cable 1 bends in the second portion 12 located between the first portion 11 and the third portion 13 of the flat cable 1. However, as described above, even if the flat cable 1 bends in the second portion 12, generation of stress in the first portion 11 due to the bending is suppressed. For this reason, it is possible to suppress peeling of the sheet-like electrode 10 from the piezoelectric element 25 (see FIG. 4) in the first portion 11. That is, it is possible to suppress occurrence of a defect in the piezoelectric sensor 30 due to bending of the flat cable 1.

[0037] And, as described above, in the state where the piezoelectric sensor 30 including the flat cable 1 is attached to the guitar 100, the vibration of the string 103 is transmitted to the piezoelectric sensor 30 via the saddle 107 and is converted into an electrical signal. The electrical signal is transmitted by the electrical wiring 22 of the flat cable 1 to a device (not shown) disposed outside the groove 106.

[0038] As described above, the present invention has been described in detail. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

[0039] In the present invention, the two sheet-like electrodes 10 are not limited to being separately formed as in the above-described embodiment. For example, as shown in FIG. 12, they may be integrally formed. When the two sheet-like electrodes 10 are integrally formed, by bending these two sheet-like electrodes 10 at their boundary lines 17, the two sheet-like electrodes 10 can be overlapped in the first portion 11 and the third portion 13. Also, the two sheet-like electrodes 10 can be adjacent to each other in the width direction in the second portion 12. In FIG. 12, the end portions in the width direction of the two sheet-like electrodes 10 are connected to each other. However, for example, the end portions in the longitudinal direction of the two sheet-like electrodes 10 may be connected to each other.

[0040] In the present invention, the width dimensions of the two sheet-like electrodes 10 in the second portion 12 may be different from each other, for example. Also, in the present invention, the total W2t of the respective width dimensions of the two sheet-like electrodes 10 in the second portion 12 is, for example, equal to or less than the width dimension of the sheet-like electrode 10 in one of the first portion 11 and the third portion 13, and may be larger than the width dimension of the sheet-like electrode 10 in the other of the first portion 11 and the third portion 13. Also, the width dimension W2t of the two sheet-like electrodes 10 in the second portion 12 may be larger than the width dimensions W1 and W3 of the sheet-like electrodes 10 in both the first portion 11 and the third portion 13, for example. Also, the sheet-like electrode 10 in the second portion 12 may project outward from the ends of the sheet-like electrodes 10 in the first portion 11 and / or the third portion 13 in the width direction.

[0041] In the present invention, the electrical wirings 22 of the two sheet-like electrodes 10 do not necessarily need to be aggregated to the first sheet-like electrode 10A in the third portion 13, for example. In this case, connection terminals for connecting the electrical wiring 22 to a device (not shown) may be provided at the tips in the extending direction of the two sheet-like electrodes 10.

[0042] In the present invention, the number of sheet-like electrodes provided in the flat cable is not limited to two, and may be a plurality. For this reason, in the first portion and the third portion of the sheet-like electrode, a plurality of sheet-like electrodes may be fixed by being stacked in their thickness direction. Also, in the second portion of the sheet-like electrode, a plurality of sheet-like electrodes may be arranged adjacent to each other in the width direction of the sheet-like electrode.

Explanation of Reference Numerals

[0043] 1... flat cable, 10... sheet-like electrode, 10A... first sheet-like electrode, 10B... second sheet-like electrode, 11... first portion, 12... second portion, 13... third portion, 14... extension portion, 21... sheet base material, 211... first surface of the sheet base material 21, 22... electrical wiring, 25... piezoelectric element

Claims

1. Comprising at least two sheet-shaped electrodes formed in a strip shape, The sheet-shaped electrode has a first portion, a second portion, and a third portion arranged in order in the longitudinal direction of the sheet-shaped electrode, In the first portion and the third portion, the two sheet-shaped electrodes are fixed by overlapping in the thickness direction of the sheet-shaped electrode, A flat cable in which, in the second portion, the two sheet-shaped electrodes are arranged adjacent to each other in the width direction of the sheet-shaped electrode.

2. The flat cable according to claim 1, wherein the sum of the respective width dimensions of the two sheet-shaped electrodes in the second portion is equal to or less than the respective width dimensions of the two sheet-shaped electrodes in at least one of the first portion and the third portion.

3. Each of the two sheet-shaped electrodes has a strip-shaped sheet base material extending in the longitudinal direction, and an electrical wiring provided on the first surface side in the thickness direction of the sheet base material and extending in the longitudinal direction, In the first portion, the two sheet-shaped electrodes are fixed to each other such that the first surfaces of the sheet base materials of the two sheet-shaped electrodes face each other, and the electrical wirings of the two sheet-shaped electrodes are electrically insulated from each other, In the third portion, the two sheet-shaped electrodes are fixed to each other such that the first surfaces of the sheet base materials of the two sheet-shaped electrodes face each other, and the electrical wirings of the two sheet-shaped electrodes are aggregated into a first sheet-shaped electrode among the two sheet-shaped electrodes, The flat cable according to claim 1 or claim 2, wherein the first sheet-shaped electrode has an extension portion further extending from the third portion and including the two aggregated electrical wirings.

4. The flat cable according to any one of claims 1 to 3, wherein a piezoelectric element is arranged between the two sheet-shaped electrodes in the first portion.

Images