Electrostatic transducer

Abstract

To provide an electrostatic transducer with which it is possible to reliably electrically connect a core wire of a lead wire to an electrode sheet and increase the pull-out resistance strength of the lead wire.SOLUTION: An electrostatic transducer 1 comprises: a first electrical junction part 81 for electrically connecting a first electrode sheet 20 and a first core wire 40a of a first lead wire 40; a first insulating junction part 82 for connecting an insulator sheet 10 and a first cladding material 40b of the first lead wire 40; a second electrical junction part 91 for electrically connecting a second electrode sheet 30 and a second core wire 50a of a second lead wire 50; and a second insulating junction part 92 for connecting the insulator sheet 10 and a second cladding material 50b of the second lead wire 50. The first and second electrical junction parts 81, 91 are arranged in the surface direction of the insulator sheet 10 with a space therebetween, and the first and second insulating junction parts 82, 92 are arranged in the surface direction of the insulator sheet 10 with a space therebetween.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an electrostatic transducer.

[0002] Patent Document 1 describes exposing the core wire of a lead wire (which is the same as a conducting wire), connecting the core wire to an electrode pad on a substrate by ultrasonic bonding, and fixing the lead wire to the substrate with an adhesive resin. Patent Document 2 describes connecting the exposed core wire to a connection land by ultrasonic bonding via a metal tube.

[0003] Patent Document 3 describes joining the core wire of a lead wire and a terminal electrode by ultrasonic bonding without peeling the insulation coating at the terminal of the lead wire. Patent Document 4 describes that a spiral flat coil is formed on the surface of a thermoplastic film. The flat coil is formed by fusing a lead wire (conducting wire) coated with a thermoplastic resin to the surface of the film so as to be spiraled in substantially the same direction and have substantially the same shape.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a state where the tip of the lead wire is attached to the electrode sheet, preventing the lead wire from being pulled out or peeled off from the electrode sheet in the axial direction of the lead wire is important from the viewpoint of the reliability of the connection state. In particular, when the electrode sheet is flexible, the lead wire is likely to be pulled out or peeled off. Furthermore, it is required to connect the electrode sheet and the lead wire easily and at low cost.

[0006] The present invention has been made in view of such a background, and aims to provide an electrostatic transducer that can surely electrically bond the core wire of the lead wire to the electrode sheet and increase the pull-out resistance strength of the lead wire.

Means for Solving the Problems

[0007] One aspect of the present invention is an insulator sheet, a first electrode sheet disposed on the first surface of the insulator sheet, a second electrode sheet disposed on the second surface of the insulator sheet, a first lead wire including a first core wire and a first coating formed by covering the first core wire and containing a thermoplastic material, having a portion disposed overlapping the first surface of the insulator sheet and a portion disposed overlapping the first electrode sheet, a second lead wire including a second core wire and a second coating formed by covering the second core wire and containing a thermoplastic material, having a portion disposed overlapping the second surface of the insulator sheet and a portion disposed overlapping the second electrode sheet, a first electrical bonding portion that electrically bonds the first electrode sheet and the first core wire of the first lead wire in a first electrical bonding region where the first electrode sheet and the first core wire of the first lead wire are disposed overlappingly in the plane direction of the insulator sheet, a first insulation bonding portion that bonds the insulator sheet and the first coating of the first lead wire in a first insulation bonding region that is a region different from the first electrical bonding region in the plane direction of the insulator sheet and where the insulator sheet and the first coating of the first lead wire are disposed overlappingly, In a region in the plane direction of the insulator sheet, in a second electrical junction region where the second electrode sheet and the second core wire of the second lead wire are arranged overlappingly, a second electrical junction portion that electrically joins the second electrode sheet and the second core wire of the second lead wire, In a region different from the second electrical junction region in the plane direction of the insulator sheet, in a second insulation junction region where the insulator sheet and the second covering material of the second lead wire are arranged overlappingly, a second insulation junction portion that joins the insulator sheet and the second covering material of the second lead wire, Comprising The first electrical junction portion and the second electrical junction portion are arranged spaced apart in the plane direction of the insulator sheet, The first insulation junction portion and the second insulation junction portion are arranged spaced apart in the plane direction of the insulator sheet, in an electrostatic transducer.

Advantages of the Invention

[0008] According to the above aspect, the first electrical junction portion in the first electrical junction region electrically joins the first electrode sheet and the first core wire of the first lead wire. On the other hand, the first insulation junction portion in the first insulation junction region joins the insulator sheet and the first covering material of the first lead wire. That is, the pull-out strength of the first lead wire is in a state where the second insulation junction portion in the first insulation junction region mainly functions. In this way, by making the site of the electrical junction between the first electrode sheet and the first core wire of the first lead wire and the site for ensuring the pull-out strength of the first lead wire into separate sites, it is possible to achieve both electrical junction and high pull-out strength. Therefore, the first core wire of the first lead wire can be surely electrically joined to the first electrode sheet, and the pull-out strength of the first lead wire can be increased.

[0009] The same applies to the junction between the second electrode sheet and the second lead wire. Therefore, the second core wire of the second lead wire can be surely electrically joined to the second electrode sheet, and the pull-out strength of the second lead wire can be increased.

[0010] Furthermore, the first electrical joint and the second electrical joint are arranged to be spaced apart in the plane direction of the insulator sheet, and the first insulating joint and the second insulating joint are arranged to be spaced apart in the plane direction of the insulator sheet. This facilitates the joining process at the first electrical joint and the second electrical joint, and also facilitates the joining process at the first insulating joint and the second insulating joint. Furthermore, the thickness of the insulator sheet can be reduced.

[0011] As described above, according to the above aspect, it is possible to reliably electrically join the first core wire of the first lead wire to the first electrode sheet and increase the pull-out strength of the first lead wire, and also to reliably electrically join the second core wire of the second lead wire to the second electrode sheet and increase the pull-out strength of the second lead wire, thereby providing an electrostatic transducer.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0013] (Embodiment 1) 1. Application Target The electrostatic transducer includes, for example, a base material and an electrostatic sheet attached to the attachment surface of the base material. The base material is an arbitrary member and is formed of metal, resin, or other materials.

[0014] Further, the mounting surface of the base material may be formed into a three-dimensional shape such as a curved surface, a composite plane (a shape formed by a plurality of planes), a composite shape of a plane and a curved surface, or may be formed into a single planar shape. When the base material is formed of a flexible material, the electrostatic sheet can also be attached to the mounting surface of the base material. Further, the electrostatic transducer may be configured of the electrostatic sheet alone without including the base material.

[0015] The electrostatic sheet is disposed on the mounting surface (surface) of the base material. The electrostatic sheet is flexible as a whole. That is, the electrostatic sheet has flexibility and is configured to be stretchable in the plane direction. Therefore, even if the mounting surface of the base material is a three-dimensional shape, the electrostatic sheet can be attached along the mounting surface of the base material. In particular, by attaching the electrostatic sheet to the mounting surface of the base material while stretching it in the plane direction, it is possible to suppress the occurrence of wrinkles in the electrostatic sheet.

[0016] The electrostatic sheet is configured to function as an actuator or a sensor by utilizing a change in capacitance between a pair of target electrodes. The electrostatic sheet only needs to include at least one of the pair of target electrodes, and is not limited to a configuration including the pair of target electrodes. Further, in the electrostatic sheet, a shield electrode may be provided. That is, the electrostatic sheet includes a first type including a pair of target electrodes, a second type including a pair of target electrodes and a shield electrode, a third type including one of the pair of target electrodes and a shield electrode, and the like. In the third type, the other target electrode can also be an external conductor.

[0017] The electrostatic sheet can be configured as an actuator that generates vibrations, sounds, etc. by utilizing a change in capacitance between a pair of target electrodes. Further, the electrostatic sheet can be configured as a sensor that detects, for example, an external pushing force or the like by utilizing a change in capacitance between target electrodes, or a sensor that detects contact or proximity of a conductor having a potential.

[0018] When the electrostatic sheet is configured as an actuator, a voltage is applied to the target electrodes, causing the insulator to deform according to the potential between the target electrodes, and vibrations are generated as the insulator deforms. When the electrostatic sheet is configured as a sensor for detecting a pushing force, the capacitance between the target electrodes changes due to the deformation of the insulator caused by an input such as an external pushing force, vibration, or sound (hereinafter referred to as an external pushing force, etc.), and the external pushing force, etc. is detected by detecting a voltage corresponding to the capacitance between the target electrodes.

[0019] Also, when the electrostatic sheet is configured as a sensor for detecting contact or proximity, the capacitance between the target electrodes changes due to the contact or proximity of a conductor having a potential, and the contact or proximity of the conductor is detected by detecting a voltage corresponding to the changed capacitance between the target electrodes.

[0020] The electrostatic transducer can be applied, for example, to the surfaces of a mouse or joystick which are pointing devices, the surfaces of vehicle parts, etc. Vehicle parts include armrests, doorknobs, shift levers, steering wheels, door trims, center trims, center consoles, ceilings, etc. In many cases, the base material is formed of a non-flexible material such as metal or hard resin. And the electrostatic transducer can be configured to detect the state of the target person and apply vibrations, etc. to the target person.

[0021] Also, the electrostatic transducer may be disposed on the seat surface or the back of the seat in order to detect the state of the seated person on the seat. In this case, the electrostatic transducer may be disposed on the seat as the electrostatic sheet alone, or may be configured to attach the electrostatic sheet to an arbitrary base material.

[0022] Also, the electrostatic transducer can be configured to have a heater function. In this case, in addition to detecting the state of the target person and applying vibrations, etc. to the target person, the electrostatic transducer can apply heat to the target person.

[0023] 2. Overall Structure of Electrostatic Transducer 1 The overall structure of the electrostatic transducer 1 according to Embodiment 1 will be described with reference to FIG. 1. The electrostatic transducer 1 includes at least an electrostatic sheet 2. The electrostatic sheet 2 may be arranged on the surface of a substrate (not shown) or may be used alone.

[0024] In FIG. 1, the electrostatic sheet 2 is formed in a long planar shape. However, the electrostatic sheet 2 has flexibility and is configured to be stretchable, so that it can have an arbitrary shape. That is, the electrostatic sheet 2 shown in FIG. 1 shows the initial shape before deformation.

[0025] The electrostatic sheet 2 includes at least an insulator sheet 10, a first electrode sheet 20, a second electrode sheet 30, a first lead wire 40, and a second lead wire 50. In this embodiment, the electrostatic sheet 2 includes a plurality (for example, two) of first electrode sheets 20, one second electrode sheet 30, and further includes a plurality (for example, two) of first lead wires 40 and a plurality (for example, two) of second lead wires 50 as an example.

[0026] The insulator sheet 10 is formed by including, for example, an elastomer as a main component. Therefore, the insulator sheet 10 is flexible. That is, the insulator sheet 10 has flexibility and is configured to be extensible in the plane direction. The insulator sheet 10 is formed by including, for example, a thermoplastic material, particularly a thermoplastic elastomer as a main component. The insulator sheet 10 may be formed of the thermoplastic elastomer itself, or may be formed of an elastomer crosslinked by heating the thermoplastic elastomer as a raw material as a main component.

[0027] In addition, the insulator sheet 10 may contain rubbers, resins, and other materials other than thermoplastic elastomers. For example, when the insulator sheet 10 contains a rubber such as ethylene-propylene rubber (EPM, EPDM), the flexibility of the insulator sheet 10 is improved. From the viewpoint of improving the flexibility of the insulator sheet 10, the insulator sheet 10 may contain a flexibility-imparting component such as a plasticizer.

[0028] The insulator sheet 10 includes an insulating main body portion 11, a plurality (for example, two) of insulating terminal portions 12, and a plurality (for example, two) of insulating intermediate portions 13. The insulating main body portion 11 is formed in a planar shape and constitutes a region that functions as an actuator or a sensor. Each insulating terminal portion 12 constitutes a region that is joined to the first lead wire 40 and the second lead wire 50. The insulating terminal portion 12 is indirectly connected to the insulating main body portion 11 and is formed outward in the plane direction from the side of the insulating main body portion 11. Each insulating intermediate portion 13 constitutes a region that connects the insulating main body portion 11 and the insulating terminal portion 12. The insulating intermediate portion 13 is interposed between the insulating main body portion 11 and the insulating terminal portion 12 in the plane direction of the insulator sheet 10. Note that the insulating terminal portion 12 may be directly connected to the insulating main body portion 11. In this case, the insulating intermediate portion 13 will not exist.

[0029] One insulating terminal portion 12 and one insulating intermediate portion 13 are formed so as to extend outward in the short side direction of the insulating main body portion 11 from the intermediate portion in the longitudinal direction of the insulating main body portion 11. Also, the other insulating terminal portion 12 and the other insulating intermediate portion 13 are formed so as to extend outward from near the end in the longitudinal direction of the longitudinal side of the insulating main body portion 11. However, the arrangement of the insulating terminal portion 12 and the insulating intermediate portion 13 can be set arbitrarily.

[0030] A plurality of first electrode sheets 20 are arranged in a plurality in the plane direction of the insulator sheet 10 on the first surface of the insulator sheet 10, that is, on the surface (front surface in FIG. 1) side of the insulator sheet 10. The first electrode sheet 20 constitutes a detection electrode. The first electrode sheet 20 has conductivity. Further, the first electrode sheet 20 is flexible. That is, the first electrode sheet 20 has flexibility and is configured to be extensible in the plane direction. The first electrode sheet 20 is formed of, for example, a conductive cloth, a conductive elastomer, a metal foil, or the like.

[0031] Each first electrode sheet 20 includes a first electrode main body portion 21, a first electrode terminal portion 22, and a first electrode intermediate portion 23. The first electrode main body portion 21 is formed in a planar shape. Each of the plurality of first electrode main body portions 21 is disposed so as to overlap the insulating main body portion 11 of the insulator sheet 10. The first electrode terminal portion 22 is indirectly connected to the first electrode main body portion 21, is formed outward in the plane direction from the side edge of the first electrode main body portion 21, and is disposed so as to overlap the insulating terminal portion 12 of the insulator sheet 10.

[0032] The first electrode intermediate portion 23 connects the first electrode main body portion 21 and the first electrode terminal portion 22. That is, the first electrode intermediate portion 23 is interposed between the first electrode main body portion 21 and the first electrode terminal portion 22 in the plane direction of the first electrode sheet 20. The first electrode intermediate portion 23 is disposed so as to overlap the insulating intermediate portion 13. Note that the first electrode terminal portion 22 may be directly connected to the first electrode main body portion 21. In this case, the first electrode intermediate portion 23 does not exist.

[0033] One second electrode sheet 30 is disposed on the second surface of the insulator sheet 10, that is, on the back surface (rear surface in FIG. 1) side of the insulator sheet 10. One second electrode sheet 30 constitutes one shield electrode facing the plurality of first electrode sheets 20. The second electrode sheet 30 has conductivity. Further, the second electrode sheet 30 is flexible. That is, the second electrode sheet 30 has flexibility and is configured to be extensible in the plane direction. The second electrode sheet 30 is formed of, for example, a conductive cloth, a conductive elastomer, a metal foil, or the like.

[0034] The second electrode sheet 30 includes one second electrode main body portion 31, a plurality of second electrode terminal portions 32, and a plurality of second electrode intermediate portions 33. The second electrode main body portion 31 is formed in a planar shape. The second electrode main body portion 31 is disposed so as to overlap the insulating main body portion 11 of the insulator sheet 10. Further, one second electrode main body portion 31 is disposed so as to face substantially the entire surface of the plurality of first electrode main body portions 21.

[0035] The number of the plurality of second electrode terminal portions 32 is the same as the number of the plurality of first electrode terminal portions 22. Each of the plurality of second electrode terminal portions 32 is indirectly connected to the second electrode main body portion 31, is formed outward in the plane direction from the side of the second electrode main body portion 31, and is disposed so as to overlap the insulating terminal portion 12 of the insulator sheet 10. Each of the plurality of second electrode terminal portions 32 is disposed at a position separated from each of the plurality of first electrode terminal portions 22 in the plane direction of the insulating terminal portion 12 of the insulator sheet 10. That is, when viewed from the normal direction of the insulating terminal portion 12 of the insulator sheet 10, the plurality of first electrode terminal portions 22 and the plurality of second electrode terminal portions 32 are located at different positions. This is for reducing the thickness of the electrostatic sheet 2 due to the presence of the first lead wire 40 and the second lead wire 50 described later.

[0036] Each of the plurality of second electrode intermediate portions 33 connects the second electrode main body portion 31 and the second electrode terminal portion 32. That is, the second electrode intermediate portion 33 is interposed between the second electrode main body portion 31 and the second electrode terminal portion 32 in the plane direction of the second electrode sheet 30. The second electrode intermediate portion 33 is disposed so as to overlap the insulating intermediate portion 13. The second electrode intermediate portion 33 is disposed so as to face the first electrode intermediate portion 23 at least in part. Note that the second electrode intermediate portion 33 may be disposed so as to face the first electrode intermediate portion 23 entirely. Also, the second electrode terminal portion 32 may be directly connected to the second electrode main body portion 31. In this case, the second electrode intermediate portion 33 does not exist.

[0037] Each of the plurality of first lead wires 40 has a portion disposed overlapping the first surface of the insulator sheet 10 and a portion disposed overlapping the first electrode sheet 20. Specifically, each of the plurality of first lead wires 40 is disposed overlapping each of the plurality of insulating terminal portions 12 of the insulator sheet 10. The first lead wire 40 is electrically connected to the first electrode terminal portion 22 of the first electrode sheet 20 and is electrically connected to the first electrode main body portion 21 via the first electrode intermediate portion 23. Further, each of the plurality of first lead wires 40 is joined to the insulating terminal portion 12 of the insulator sheet 10.

[0038] Each of the plurality of second lead wires 50 has a portion disposed overlapping the second surface of the insulator sheet 10 and a portion disposed overlapping the second electrode sheet 30. Specifically, each of the plurality of second lead wires 50 is disposed overlapping each of the plurality of insulating terminal portions 12 of the insulator sheet 10. The second lead wire 50 is electrically connected to the second electrode terminal portion 32 of the second electrode sheet 30 and is electrically connected to the second electrode main body portion 31 via the second electrode intermediate portion 33. Further, each of the plurality of second lead wires 50 is joined to the insulating terminal portion 12 of the insulator sheet 10.

[0039] 3. Detailed Configuration of Terminal Portion of Electrostatic Sheet 2 The detailed configuration of the terminal portion of the electrostatic sheet 2 constituting the electrostatic transducer 1 will be described with reference to FIGS. 2 to 4. FIG. 2 shows the terminal portion in the upper right of FIG. 1, and the detailed configuration of the terminal portion will be described below. However, the terminal portion in the lower center of FIG. 1 also has a substantially similar configuration.

[0040] As described with reference to FIG. 1, the electrostatic sheet 2 includes at least the insulator sheet 10, the first electrode sheet 20, and the second electrode sheet 30. The insulator sheet 10 is formed including a thermoplastic material as described above, has flexibility, and is configured to be stretchable in the plane direction.

[0041] The first electrode sheet 20 is disposed on the first surface of the insulator sheet 10, that is, on the surface (the upper surface in FIGS. 3 and 4) side of the insulator sheet 10. The first electrode sheet 20 has conductivity, flexibility, and is configured to be stretchable in the plane direction. In FIGS. 3 and 4, the case where the first electrode sheet 20 is a conductive cloth is illustrated. However, the first electrode sheet 20 may be formed of a conductive elastomer, a metal foil, or the like.

[0042] The case where the first electrode sheet 20 is formed of a conductive cloth will be described in detail. The conductive cloth is a woven or non-woven fabric formed of conductive fibers. Here, the conductive fibers are formed by coating the surface of flexible fibers with a conductive material. The conductive fibers are formed, for example, by plating the surface of resin fibers such as polyethylene with copper, nickel, or the like.

[0043] In this case, the first electrode sheet 20 is joined to the insulator sheet 10 by fusing (heat fusion) the insulator sheet 10 itself. Further, since the first electrode sheet 20 is a cloth, it has a plurality of through holes. Therefore, a part of the insulator sheet 10 enters the through holes of the first electrode sheet 20. That is, at least a part of the first electrode sheet 20 is in a state of being embedded in the insulator sheet 10.

[0044] The case where the first electrode sheet 20 is formed of a conductive elastomer will be described in detail. In this case, the first electrode sheet 20 is formed by using an elastomer as a base material and containing a conductive filler. The elastomer that is the base material of the first electrode sheet 20 is preferably of the same kind as the main component of the insulator sheet 10. In particular, the first electrode sheet 20 is preferably formed using a thermoplastic elastomer as a base material.

[0045] However, the first electrode sheet 20 is formed of a material having a softening point higher than that of the insulator sheet 10. This is to soften the insulator sheet 10 before the first electrode sheet 20 when joining the first electrode sheet 20 to the insulator sheet 10 by fusing (heat fusion) the insulator sheet 10 itself. As a result, the thickness of the insulator sheet 10 can be made the desired thickness.

[0046] Here, the first electrode sheet 20 is joined to the insulator sheet 10 by fusing (heat fusion) the insulator sheet 10 itself. Further, when the first electrode sheet 20 is formed such that the thermoplastic elastomer is located on the surface layer, the first electrode sheet 20 and the insulator sheet 10 are joined by fusing (heat fusion) the first electrode sheet 20 itself. That is, the first electrode sheet 20 and the insulator sheet 10 are joined by mutual fusion. Note that the first electrode sheet 20 and the insulator sheet 10 may be joined by fusing only one of them.

[0047] The case where the first electrode sheet 20 is formed of a metal foil will be described in detail. The metal foil preferably has a plurality of through-holes, similar to the conductive cloth. Therefore, the first electrode sheet 20 has flexibility and can be extended in the plane direction as the through-holes are deformed. The metal foil may be any conductive metal material, and for example, copper foil, aluminum foil, etc. can be applied. Further, the first electrode sheet 20 is joined to the insulator sheet 10 by fusing (heat fusion) the insulator sheet 10 itself, similar to the case where the first electrode sheet 20 is a conductive cloth.

[0048] The second electrode sheet 30 is disposed on the second surface of the insulator sheet 10, that is, on the back surface (lower surface in FIGS. 3 and 4) side of the insulator sheet 10. If the electrostatic transducer 1 includes a base material (not shown), the second electrode sheet 30 is disposed between the insulator sheet 10 and the base material. The second electrode sheet 30 is formed in the same manner as the first electrode sheet 20. That is, the second electrode sheet 30 is flexible and is formed of a conductive cloth, a conductive elastomer, a metal foil, or the like.

[0049] The electrostatic sheet 2 further includes a first lead wire 40, a second lead wire 50, a first joint restriction layer 60, and a second joint restriction layer 70.

[0050] As shown in FIGS. 2 and 3, the first joint restriction layer 60 is disposed between the insulating terminal portion 12 of the insulator sheet 10 and the first electrode terminal portion 22 of the first electrode sheet 20, and restricts the joining of the insulator sheet 10 and the first electrode sheet 20. Therefore, a space is formed between the first joint restriction layer 60 in the region of the first electrode terminal portion 22 of the first electrode sheet 20 where the first joint restriction layer 60 exists. On the other hand, in the region of the first electrode terminal portion 22 of the first electrode sheet 20 where the first joint restriction layer 60 does not exist, it is joined to the insulator sheet 10.

[0051] Also, the first joint restriction layer 60 is joined to the insulator sheet 10 by the fusion of the insulator sheet 10 itself. Therefore, the first joint restriction layer 60 is formed of a material having a softening point higher than that of the insulator sheet 10, for example. For example, a resin sheet formed of a thermoplastic material can be applied to the first joint restriction layer 60.

[0052] As shown in FIG. 2, the first joint restriction layer 60 is formed in a long shape. One end in the longitudinal direction of the first joint restriction layer 60 is disposed at the end side of the first electrode terminal portion 22 of the first electrode sheet 20. The other end in the longitudinal direction of the first joint restriction layer 60 is disposed so as to extend from the end side of the first electrode terminal portion 22 of the first electrode sheet 20 toward the first electrode intermediate portion 23 of the first electrode sheet 20. In this embodiment, the other end in the longitudinal direction of the first joint restriction layer 60 is disposed so as to extend in a direction intersecting, particularly in an oblique direction, with respect to the end side of the first electrode sheet 20.

[0053] The first joint regulation layer 60 includes a recess 61 formed with a small width and an edge 62 formed with a large width. In FIG. 2, the recess 61 is formed with the same width over the entire length, and the edge 62 is also formed with the same width over the entire length. In addition to this, it may be formed with a gradually decreasing width from the base end of the edge 62 (the edge side of the first electrode terminal portion 22 of the first electrode sheet 20) toward the tip of the recess 61. Further, the first joint regulation layer 60 may be formed in a flat plate shape, or may have recesses or protrusions formed on one or both surfaces.

[0054] As shown in FIG. 3, the first lead wire 40 includes a first core wire 40a and a first coating material 40b that insulatingly coats the outer peripheral surface of the first core wire 40a. The first core wire 40a is formed of, for example, a copper wire. The first coating material 40b is formed including a thermoplastic material. The first coating material 40b may be any thermoplastic material having insulating properties, and is formed of, for example, a material applicable to the above-described insulator sheet 10.

[0055] A part of the first lead wire 40 is disposed on the first surface (the upper surface in FIG. 3) of the insulator sheet 10 at the insulating terminal portion 12. In the electrostatic sheet 2, since a part of the first lead wire 40 is disposed in a region where both the insulating terminal portion 12 of the insulator sheet 10 and the first electrode terminal portion 22 of the first electrode sheet 20 exist, it is disposed overlapping the insulating terminal portion 12 and also overlapping the first electrode terminal portion 22.

[0056] In the case where the first electrode terminal portion 22 of the first electrode sheet 20 has a region that is not disposed overlapping a part of the insulating terminal portion 12 of the insulator sheet 10, the first lead wire 40 may be configured to have a portion disposed overlapping only the insulating terminal portion 12 and a portion disposed overlapping both the insulating terminal portion 12 and the first electrode terminal portion 22, respectively. In this case, the first lead wire 40 has at least a portion disposed overlapping the insulating terminal portion 12 and a portion disposed overlapping the first electrode terminal portion 22.

[0057] In this embodiment, the first lead wire 40 is disposed between the insulating terminal portion 12 and the first electrode terminal portion 22. In particular, since the first bonding restriction layer 60 is disposed on the insulating terminal portion 12, the first lead wire 40 is disposed between the first bonding restriction layer 60 and the first electrode terminal portion 22.

[0058] The first lead wire 40 includes a first core wire exposed portion 41 at the tip side of the first lead wire 40, where the first covering material 40b is removed and the first core wire 40a is exposed. And the first lead wire 40 includes a first core wire covered portion 42 at the base end side rather than the first core wire exposed portion 41, where the first covering material 40b is not removed.

[0059] The first core wire exposed portion 41 may be configured as follows. A metal plating layer is formed on the first core wire 40a formed of a copper wire for the first core wire exposed portion 41. In this case, nickel plating is suitable for the metal plating layer. Also, a solder flow layer may be formed on the first core wire 40a for the first core wire exposed portion 41. The metal plating layer and the solder flow layer have the role of improving the conduction with the first electrode terminal portion 22.

[0060] The first core wire exposed portion 41 of the first lead wire 40 is disposed in the inner portion 61 of the first bonding restriction layer 60, and the first core wire covered portion 42 is disposed at the edge portion 62 of the first bonding restriction layer 60. And the first lead wire 40 extends outward from the edge portion 62 of the first bonding restriction layer 60.

[0061] Here, the first lead wire 40 is disposed at the position by being inserted into the space formed between the first bonding restriction layer 60 and the first electrode terminal portion 22. The first bonding restriction layer 60 has a wide width at the edge portion 62 and a narrow width at the inner portion 61. Therefore, when the first lead wire 40 is inserted, the wide width of the edge portion 62 facilitates the initial insertion, and the narrow width of the inner portion 61 enables the first lead wire 40 to be positioned at the desired position.

[0062] Furthermore, in the region of the electrostatic sheet 2 in the plane direction of the insulating terminal portion 12, in a first electrical bonding region Pa where the first electrode terminal portion 22 and the first core wire exposed portion 41 of the first lead wire 40 are adjacently and overlappingly arranged, a first electrical bonding portion 81 that electrically bonds the first electrode terminal portion 22 and the first core wire exposed portion 41 of the first lead wire 40 is provided. That is, the first electrical bonding portion 81 is arranged in the laminated region of the insulating terminal portion 12 and the first electrode terminal portion 22.

[0063] In this embodiment, in the first electrical bonding region Pa, the first electrode terminal portion 22 and the first core wire 40a portion of the first core wire exposed portion 41 are electrically bonded via a metal plating layer or a solder flow layer. That is, the first electrical bonding portion 81 is constituted by a part of the metal plating layer or a part of the solder flow layer. In particular, since the first electrical bonding portion 81 is constituted by a part of the solder flow layer, the first electrode terminal portion 22 and the first core wire 40a portion of the first core wire exposed portion 41 are electrically bonded in a planar manner, and good conduction can be achieved.

[0064] Here, a part of the first bonding restriction layer 60 is arranged in the first electrical bonding region Pa. Therefore, after the first lead wire 40 is inserted between the first electrode terminal portion 22 and the first bonding restriction layer 60, by performing an ultrasonic welding process on the first electrical bonding region Pa, the first electrode terminal portion 22 and the first core wire exposed portion 41 of the first lead wire 40 are electrically bonded. Note that since the first electrode terminal portion 22 and the first lead wire 40 have metal on their surfaces, they are bonded by ultrasonic welding. On the other hand, although the first lead wire 40 and the first bonding restriction layer 60 are adjacent to each other, since they are made of metal and resin, they are not welded even if ultrasonic welding is performed.

[0065] Further, in a first insulation joint region Pb where the insulating terminal portion 12 and the first core wire covering portion 42 of the first lead wire 40 are overlapped and arranged within the region of the insulating terminal portion 12 in the plane direction, the electrostatic sheet 2 includes a first insulation joint portion 82 that joins the insulating terminal portion 12 and the first core wire covering portion 42 of the first lead wire 40. The first insulation joint portion 82 is arranged in the laminated region of the insulating terminal portion 12 and the first electrode terminal portion 22. However, the first insulation joint portion 82 is arranged in a region different from the first electrical joint portion 81 in the laminated region.

[0066] A part of the first joint regulation layer 60 is arranged in the first insulation joint region Pb. And a part of the first joint regulation layer 60 is arranged between the insulating terminal portion 12 and the first core wire covering portion 42 of the first lead wire 40 in the first insulation joint region Pb. Therefore, in the first insulation joint region Pb, the insulating terminal portion 12 and the first joint regulation layer 60 are joined, and the first joint regulation layer 60 and the first core wire covering portion 42 of the first lead wire 40 are joined. That is, the first insulation joint portion 82 is composed of a part of the insulating terminal portion 12, a part of the first joint regulation layer 60, and a part of the first core wire covering portion 42. Thus, the first insulation joint portion 82 indirectly joins the insulating terminal portion 12 and the first core wire covering portion 42 via the first joint regulation layer 60.

[0067] After the first lead wire 40 is inserted between the first electrode terminal portion 22 and the first joint regulation layer 60, by performing an ultrasonic welding process on the first insulation joint region Pb, the insulating terminal portion 12 and the first joint regulation layer 60 are joined, and the first joint regulation layer 60 and the first core wire covering portion 42 are joined. The processing conditions of ultrasonic welding in the first insulation joint portion 82 are different from the processing conditions of ultrasonic welding in the first electrical joint portion 81. While the first electrical joint portion 81 has processing conditions that enable welding of the first core wire exposed portion 41, the first insulation joint portion 82 has processing conditions such that the first core wire 40a of the first core wire covering portion 42 does not weld.

[0068] As shown in FIGS. 2 and 4, the second joint regulation layer 70 is disposed between the insulating terminal portion 12 of the insulator sheet 10 and the second electrode terminal portion 32 of the second electrode sheet 30, and regulates the joining of the insulator sheet 10 and the second electrode sheet 30. The second joint regulation layer 70 is configured substantially the same as the first joint regulation layer 60. The second joint regulation layer 70 includes a back portion 71 and an edge portion 72, similar to the first joint regulation layer 60.

[0069] As shown in FIG. 4, the second lead wire 50 includes a second core wire 50a and a second covering material 50b that insulatingly covers the outer peripheral surface of the second core wire 50a. The second lead wire 50 has a second core wire exposed portion 51 at the tip side of the second lead wire 50 where the second covering material 50b is removed and the second core wire 50a is exposed. And the second lead wire 50 includes a second core wire covered portion 52 where the second covering material 50b is not removed. The second lead wire 50 is configured substantially the same as the first lead wire 40.

[0070] Then, the electrostatic sheet 2 has a second electrical joint portion 91 that electrically joins the second electrode terminal portion 32 and the second core wire exposed portion 51 of the second lead wire 50 in the second electrical joint region Pc, and in the second insulating joint region Pd, an insulating terminal portion 12 and the second core wire covered portion 52 of the second lead wire 50 are indirectly joined via the second joint regulation layer 70, and includes a second insulating joint portion 92. The second electrical joint portion 91 and the second insulating joint portion 92 are substantially the same as the first electrical joint portion 81 and the first insulating joint portion 82 described above. Also, the second electrical joint region Pc and the second insulating joint region Pd are substantially the same as the first electrical joint region Pa and the first insulating joint region Pb described above.

[0071] Therefore, the second electrical joint portion 91 and the second insulating joint portion 92 are disposed in the laminated region of the insulating terminal portion 12 and the second electrode terminal portion 32. However, the second insulating joint portion 92 is disposed in a region different from the second electrical joint portion 91 in the laminated region.

[0072] Therefore, the first electrode terminal portion 22 and the second electrode terminal portion 32 are arranged to be separated in the plane direction of the insulating terminal portion 12 of the insulator sheet 10. That is, the first electrical joint portion 81 and the second electrical joint portion 91 are arranged to be separated in the plane direction of the insulating terminal portion 12. Further, the first insulating joint portion 82 and the second insulating joint portion 92 are arranged to be separated in the plane direction of the insulating terminal portion 12.

[0073] 4. Effects of Embodiment 1 According to the electrostatic transducer 1 of Embodiment 1, the first electrical joint portion 81 in the first electrical joint region Pa electrically joins the first electrode terminal portion 22 and the first core wire 40a in the first core wire exposed portion 41 of the first lead wire 40. On the other hand, the first insulating joint portion 82 in the first insulating joint region Pb joins the insulating terminal portion 12 and the first covering material 40b in the first core wire covering portion 42 of the first lead wire 40. That is, the pull-out strength of the first lead wire 40 is in a state where the first insulating joint portion 82 in the first insulating joint region Pb mainly functions.

[0074] In this way, by making the electrical joint site between the first electrode terminal portion 22 and the first core wire 40a of the first lead wire 40 and the site for ensuring the pull-out strength of the first lead wire 40 into separate sites, it is possible to achieve both electrical joint and high pull-out strength. Therefore, the first core wire 40a of the first lead wire 40 can be surely electrically joined to the first electrode terminal portion 22, and the pull-out strength of the first lead wire 40 can be increased.

[0075] The same applies to the joining of the second electrode sheet 30 and the second lead wire 50. Therefore, the second core wire 50a of the second lead wire 50 can be surely electrically joined to the second electrode sheet 30, and the pull-out strength of the second lead wire 50 can be increased.

[0076] Furthermore, the first electrical joint portion 81 and the second electrical joint portion 91 are arranged to be spaced apart in the plane direction of the insulator sheet 10, and the first insulating joint portion 82 and the second insulating joint portion 92 are arranged to be spaced apart in the plane direction of the insulator sheet 10. Thereby, the joining process at the first electrical joint portion 81 and the second electrical joint portion 91 becomes easy, and the joining process at the first insulating joint portion 82 and the second insulating joint portion 92 becomes easy. Furthermore, the thickness of the insulator sheet 10 can be reduced.

[0077] Therefore, the first core wire 40a of the first lead wire 40 can be surely electrically joined to the first electrode sheet 20 and the pull-out strength of the first lead wire 40 can be increased, and the second core wire 50a of the second lead wire 50 can be surely electrically joined to the second electrode sheet 30 and the pull-out strength of the second lead wire 50 can be increased.

[0078] Also, the insulator sheet 10 has an insulating main body portion 11 formed in a planar shape and an insulating terminal portion 12 that is directly or indirectly connected to the insulating main body portion 11 and is formed outward in the plane direction from the side of the insulating main body portion 11. The first electrode sheet 20 is formed in a planar shape and has a first electrode main body portion 21 arranged to overlap the insulating main body portion 11, and a first electrode terminal portion 22 that is directly or indirectly connected to the first electrode main body portion 21, is formed outward in the plane direction from the side of the first electrode main body portion 21, and is arranged to overlap the insulating terminal portion 12. The second electrode sheet 30 is formed in a planar shape and has a second electrode main body portion 31 arranged to overlap the insulating main body portion 11, and a second electrode terminal portion 32 that is directly or indirectly connected to the second electrode main body portion 31, is formed outward in the plane direction from the side of the second electrode main body portion 31, and is arranged to overlap the insulating terminal portion 12.

[0079] The first electrical joint portion 81 and the first insulating joint portion 82 are arranged in the laminated region of the insulating terminal portion 12 and the first electrode terminal portion 22. The second electrical joint portion 91 and the second insulating joint portion 92 are arranged in the laminated region of the insulating terminal portion 12 and the second electrode terminal portion 32.

[0080] Therefore, the first core wire 40a of the first lead wire 40 can be surely and electrically joined to the first electrode terminal portion 22, and the pull-out strength of the first lead wire 40 in the insulating terminal portion 12 can be increased. Further, the second core wire 50a of the second lead wire 50 can be surely and electrically joined to the second electrode terminal portion 32, and the pull-out strength of the second lead wire 50 in the insulating terminal portion 12 can be increased.

[0081] Also, the insulator sheet 10 has an insulating intermediate portion 13 interposed between the insulating main body portion 11 and the insulating terminal portion 12 in the plane direction of the insulator sheet 10. The first electrode sheet 20 has a first electrode intermediate portion 23 interposed between the first electrode main body portion 21 and the first electrode terminal portion 22 in the plane direction of the first electrode sheet 20 and disposed so as to overlap the insulating intermediate portion 13. The second electrode sheet 30 has a second electrode intermediate portion 33 interposed between the second electrode main body portion 31 and the second electrode terminal portion 32 in the plane direction of the second electrode sheet 30 and disposed so as to overlap the insulating intermediate portion 13.

[0082] By providing the insulating intermediate portion 13, the first electrode intermediate portion 23, and the second electrode intermediate portion 33, the insulating main body portion 11, the first electrode main body portion 21, and the second electrode main body portion 31, which function as parts of a sensor or an actuator, and the insulating terminal portion 12, the first electrode terminal portion 22, and the second electrode terminal portion 32, which are joined to the first lead wire 40 and the second lead wire 50, can be provided at separated positions. Thereby, each function can be surely exhibited.

[0083] Also, the electrostatic transducer 1 includes a first bonding restriction layer 60 disposed between the insulator sheet 10 and the first electrode sheet 20 in the first electrical bonding region Pa to restrict the bonding between the insulator sheet 10 and the first electrode sheet 20. By providing the first bonding restriction layer 60, it is possible to easily form a bag-shaped portion between the insulating terminal portion 12 of the insulator sheet 10 and the first electrode terminal portion 22 of the first electrode sheet 20. And with the first lead wire 40 inserted into the bag-shaped portion formed by the insulating terminal portion 12 and the first electrode terminal portion 22, the first lead wire 40 is joined to the insulating terminal portion 12 and the first electrode terminal portion 22. Therefore, it becomes easy to position the first lead wire 40 at a desired position and to securely join it.

[0084] The electrostatic transducer 1 includes a second bonding restriction layer 70 disposed between the insulator sheet 10 and the second electrode sheet 30 in the second electrical bonding region Pc to restrict the bonding between the insulator sheet 10 and the second electrode sheet 30. By providing the second bonding restriction layer 70, it is possible to easily form a bag-shaped portion between the insulating terminal portion 12 of the insulator sheet 10 and the second electrode terminal portion 32 of the second electrode sheet 30. And with the second lead wire 50 inserted into the bag-shaped portion formed by the insulating terminal portion 12 and the second electrode terminal portion 32, the second lead wire 50 is joined to the insulating terminal portion 12 and the second electrode terminal portion 32. Therefore, it becomes easy to position the second lead wire 50 at a desired position and to securely join it.

[0085] Also, a part of the first bonding restriction layer 60 is disposed between the insulator sheet 10 and the first covering material 40b of the first lead wire 40 in the first insulating bonding region Pb. The first insulating joint 82 is composed of a part of the first bonding restriction layer 60, a part of the insulator sheet 10, and a part of the first covering material 40b of the first lead wire 40. In the configuration having the first bonding restriction layer 60, the first insulating joint 82 can be surely formed.

[0086] A part of the second bonding regulation layer 70 is disposed between the insulator sheet 10 and the second covering material 50b of the second lead wire 50 in the second insulating bonding region Pd. The second insulating joint 92 is composed of a part of the second bonding regulation layer 70, a part of the insulator sheet 10, and a part of the second covering material 50b of the second lead wire 50. In the configuration having the second bonding regulation layer 70, the second insulating joint 92 can be surely formed.

[0087] Also, the first bonding regulation layer 60 and the second bonding regulation layer 70 are formed of a material having a softening point higher than that of the insulator sheet 10. Thereby, the first bonding regulation layer 60 is joined to the insulator sheet 10 by the fusion of the insulator sheet 10 itself. Similarly, the second bonding regulation layer 70 is joined to the insulator sheet 10 by the fusion of the insulator sheet 10 itself.

[0088] Also, the first bonding regulation layer 60 and the second bonding regulation layer 70 are resin sheets formed by including a thermoplastic material. Thereby, the first bonding regulation layer 60 and the second bonding regulation layer 70 can be joined to the insulator sheet 10.

[0089] Also, the first bonding regulation layer 60 is formed in a long shape, and one end in the longitudinal direction is disposed at the end side of the first electrode sheet 20. Thereby, a bag-shaped portion can be formed between the insulating terminal portion 12 of the insulator sheet 10 and the first electrode terminal portion 22 of the first electrode sheet 20, and an entrance of the bag-shaped portion can be formed.

[0090] Also, the second bonding regulation layer 70 is formed in a long shape, and one end in the longitudinal direction is disposed at the end side of the second electrode sheet 30. Thereby, a bag-shaped portion can be formed between the insulating terminal portion 12 of the insulator sheet 10 and the second electrode terminal portion 32 of the second electrode sheet 30, and an entrance of the bag-shaped portion can be formed.

[0091] In addition, a plurality of first electrode sheets 20 are arranged in the plane direction of the insulator sheet 10, and the second electrode sheet 30 constitutes one shield electrode facing the plurality of first electrode sheets 20. At each position of the plurality of first electrode sheets 20, it can function as a sensor or an actuator. On the other hand, even if the second electrode sheet 30 constitutes one shield electrode, it can surely exhibit a shielding function with respect to the functions of each of the plurality of first electrode sheets 20. Therefore, by using the second electrode sheet 30 as one shield electrode, the manufacturing cost can be reduced.

[0092] In addition, a plurality of first electrode sheets 20 are arranged in the plane direction of the insulator sheet 10, and the second electrode sheet 30 constitutes one shield electrode facing the plurality of first electrode sheets 20. Further, the insulator sheet 10 has a plurality of insulating terminal portions 12, and each of the plurality of first electrode sheets 20 has a first electrode terminal portion 22. One second electrode sheet 30 has the same number of second electrode terminal portions 32 as the first electrode sheets 20. The first electrode terminal portions 22 are overlapped and arranged on each of the plurality of insulating terminal portions 12, and the second electrode terminal portions 32 are overlapped and arranged. Even if the second electrode sheet 30 constitutes one shield electrode, the same number of second electrode terminal portions 32 as the plurality of first electrode sheets 20 are provided. Thereby, a second lead wire 50 connected to the second electrode sheet 30 can be installed at a position close to the first electrode main body portion 21. As a result, the stability of the shielding function is improved.

[0093] Also, in the first electrical bonding region Pa and the first insulating bonding region Pb, by setting different ultrasonic welding processing conditions, electrical bonding can be performed in the first electrical bonding region Pa, and bonding for ensuring the pull-out strength can be performed in the first insulating bonding region Pb. Similarly, in the second electrical bonding region Pc and the second insulating bonding region Pd, by setting different ultrasonic welding processing conditions, electrical bonding can be performed in the second electrical bonding region Pc, and bonding for ensuring the pull-out strength can be performed in the second insulating bonding region Pd.

[0094] (Embodiment 2) The configuration of the electrostatic transducer 1 according to Embodiment 2 will be described with reference to FIG. 5. In the electrostatic sheet 2 that constitutes the electrostatic transducer 1, the insulator sheet 10 has a plurality of insulating terminal portions 12. Each of the plurality of first electrode sheets 20 has a first electrode terminal portion 22. One second electrode sheet 30 has one second electrode terminal portion 32.

[0095] Then, one of the plurality of insulating terminal portions 12 has the first electrode terminal portion 22 and the second electrode terminal portion 32 disposed thereon in an overlapping manner. On the other hand, for the remaining insulating terminal portions 12 among the plurality of insulating terminal portions 12, the first electrode terminal portion 22 is disposed thereon in an overlapping manner, while the second electrode terminal portion 32 is not disposed. Thereby, by reducing the number of the second lead wires 50, cost reduction and miniaturization can be achieved.

Explanation of Reference Numerals

[0096] 1 Electrostatic transducer 10 Insulator sheet 20 First electrode sheet 30 Second electrode sheet 40 First lead wire 40a First core wire 40b First coating material 50 Second lead wire 50a Second core wire 50b Second coating material 81 First electrical junction 82 First insulating junction 91 Second electrical junction 92 Second insulating junction Pa First electrical junction region Pb First insulating junction region Pc Second electrical junction region Pd Second insulating junction region

Claims

1. An insulator sheet, A first electrode sheet disposed on a first surface of the insulator sheet, A second electrode sheet disposed on a second surface of the insulator sheet, A first lead wire including a first core wire and a first coating formed by covering the first core wire with a thermoplastic material, having a portion disposed overlapping the first surface of the insulator sheet and a portion disposed overlapping the first electrode sheet, A second lead wire including a second core wire and a second coating formed by covering the second core wire with a thermoplastic material, having a portion disposed overlapping the second surface of the insulator sheet and a portion disposed overlapping the second electrode sheet, In a first electrical junction region which is a region in the plane direction of the insulator sheet where the first electrode sheet and the first core wire of the first lead wire are disposed overlapping each other, a first electrical junction portion for electrically joining the first electrode sheet and the first core wire of the first lead wire, In a first insulation junction region which is a region different from the first electrical junction region in the plane direction of the insulator sheet where the insulator sheet and the first coating of the first lead wire are disposed overlapping each other, a first insulation junction portion for joining the insulator sheet and the first coating of the first lead wire, In a second electrical junction region which is a region in the plane direction of the insulator sheet where the second electrode sheet and the second core wire of the second lead wire are disposed overlapping each other, a second electrical junction portion for electrically joining the second electrode sheet and the second core wire of the second lead wire, In a second insulation junction region which is a region different from the second electrical junction region in the plane direction of the insulator sheet where the insulator sheet and the second coating of the second lead wire are disposed overlapping each other, a second insulation junction portion for joining the insulator sheet and the second coating of the second lead wire, comprising The first electrical junction portion and the second electrical junction portion are spaced apart in the plane direction of the insulator sheet, An electrostatic transducer in which the first insulating joint portion and the second insulating joint portion are arranged to be spaced apart in the plane direction of the insulator sheet.

2. The insulator sheet has an insulating main body portion formed in a planar shape, and an insulating terminal portion that is directly or indirectly connected to the insulating main body portion and is formed outward in the plane direction from the side of the insulating main body portion. The first electrode sheet has a first electrode main body portion formed in a planar shape and arranged to overlap the insulating main body portion, and a first electrode terminal portion that is directly or indirectly connected to the first electrode main body portion, is formed outward in the plane direction from the side of the first electrode main body portion, and is arranged to overlap the insulating terminal portion. The second electrode sheet has a second electrode main body portion formed in a planar shape and arranged to overlap the insulating main body portion, and a second electrode terminal portion that is directly or indirectly connected to the second electrode main body portion, is formed outward in the plane direction from the side of the second electrode main body portion, and is arranged to overlap the insulating terminal portion. The first electrical joint portion and the first insulating joint portion are arranged in a laminated region of the insulating terminal portion and the first electrode terminal portion. The second electrical joint portion and the second insulating joint portion are arranged in a laminated region of the insulating terminal portion and the second electrode terminal portion. The electrostatic transducer according to claim 1.

3. The insulator sheet further has an insulating intermediate portion interposed between the insulating main body portion and the insulating terminal portion in the plane direction of the insulator sheet. The first electrode sheet further has a first electrode intermediate portion interposed between the first electrode main body portion and the first electrode terminal portion in the plane direction of the first electrode sheet and arranged to overlap the insulating intermediate portion. The second electrode sheet further has a second electrode intermediate portion that is interposed between the second electrode main body portion and the second electrode terminal portion in the plane direction of the second electrode sheet and is disposed so as to overlap the insulating intermediate portion. The electrostatic transducer according to claim 2.

4. Furthermore, In the first electrical bonding region, a first bonding restriction layer is disposed between the insulator sheet and the first electrode sheet to restrict the bonding between the insulator sheet and the first electrode sheet, In the second electrical bonding region, a second bonding restriction layer is disposed between the insulator sheet and the second electrode sheet to restrict the bonding between the insulator sheet and the second electrode sheet, The electrostatic transducer according to any one of claims 1 to 3, comprising:

5. A part of the first bonding restriction layer is disposed between the insulator sheet and the first covering material of the first lead wire in the first insulating bonding region, The first insulating joint portion is composed of a part of the first bonding restriction layer, a part of the insulator sheet, and a part of the first covering material of the first lead wire, A part of the second bonding restriction layer is disposed between the insulator sheet and the second covering material of the second lead wire in the second insulating bonding region, The second insulating joint portion is composed of a part of the second bonding restriction layer, a part of the insulator sheet, and a part of the second covering material of the second lead wire. The electrostatic transducer according to claim 4.

6. The first bonding restriction layer and the second bonding restriction layer are formed of a material having a softening point higher than the softening point of the insulator sheet. The electrostatic transducer according to claim 4 or 5.

7. The first bonding restriction layer and the second bonding restriction layer are resin sheets formed by including a thermoplastic material. The electrostatic transducer according to claim 6.

8. The first joint regulation layer is formed in a long strip shape, and one end in the longitudinal direction is arranged at the edge of the first electrode sheet. The second joint regulation layer is formed in a long strip shape, and one end in the longitudinal direction is arranged at the edge of the second electrode sheet. The electrostatic transducer according to any one of claims 4 to 7.

9. A plurality of the first electrode sheets are arranged in the plane direction of the insulator sheet. The second electrode sheet constitutes one shield electrode facing a plurality of the first electrode sheets. The electrostatic transducer according to any one of claims 1 to 8.

10. A plurality of the first electrode sheets are arranged in the plane direction of the insulator sheet. The second electrode sheet constitutes one shield electrode facing a plurality of the first electrode sheets. The insulator sheet has a plurality of the insulating terminal portions. Each of the plurality of the first electrode sheets has the first electrode terminal portion. One of the second electrode sheets has the same number of the second electrode terminal portions as the first electrode sheets. The first electrode terminal portion is superposed and arranged on each of the plurality of the insulating terminal portions, and the second electrode terminal portion is superposed and arranged. The electrostatic transducer according to claim 2 or 3.

11. A plurality of the first electrode sheets are arranged in the plane direction of the insulator sheet. The second electrode sheet constitutes one shield electrode facing a plurality of the first electrode sheets. The insulator sheet has a plurality of the insulating terminal portions. Each of the plurality of the first electrode sheets has the first electrode terminal portion. One of the second electrode sheets has one of the second electrode terminal portions. The first electrode terminal portion is superposed and arranged on one of the plurality of the insulating terminal portions, and the second electrode terminal portion is superposed and arranged. The electrostatic transducer according to claim 2 or 3, wherein the first electrode terminal portion is disposed overlapping the remaining insulating terminal portions among the plurality of insulating terminal portions, and the second electrode terminal portion is not disposed overlapping.

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