Piezoelectric element connection structure, vehicle, and piezoelectric element connection method

Abstract

The present invention discloses a piezoelectric element connection structure, a vehicle, and a piezoelectric element connection method. The piezoelectric element connection structure comprises: a main body; a housing having a bottom surface and fixedly connected to the main body in a manner opposite to a substrate installation area; a piezoelectric element installed on the bottom surface; and a winding-shaped coil conductor extending from the piezoelectric element to the substrate installation area to electrically connect the piezoelectric element to the substrate.

Description

Technical Field

[0001] The invention relates to a piezoelectric element connection structure, a vehicle and a piezoelectric element connection method. Background Art

[0002] Patent document 1 discloses a piezoelectric element connection structure that electrically connects a piezoelectric element to a substrate. The piezoelectric element connection structure of Patent document 1 comprises: a substrate; a bottomed shell having a bottom surface opposite to the substrate; a piezoelectric element disposed on the bottom surface; a metal terminal connected to the substrate; and a bonding wire extending from the piezoelectric element to the metal terminal. When assembling the piezoelectric element connection structure of Patent document 1, first, the piezoelectric element is connected to one end of the bonding wire, and the metal terminal is connected to the other end of the bonding wire. Next, the direction of the surface of the piezoelectric element is changed by about 90° while bending the bonding wire, and the piezoelectric element after the change of the surface direction is bonded to the bottom surface of the shell using an adhesive or the like, and finally the metal terminal is fixed to the substrate.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent document 1: International Publication No. 2017 / 137273. Summary of the invention

[0006] Problem that the invention aims to solve

[0007] However, in the prior art of Patent Document 1, since a bonding wire that is easily plastically deformed is used, when the bonding wire bonded to the piezoelectric element is inserted into the through hole of the substrate, the bonding wire cannot stand on its own and bends. Therefore, in order to connect the bonding wire to the substrate, a metal terminal fixed to the substrate is required, which generates a process of connecting the bonding wire to the metal terminal, a process of connecting the metal terminal to the substrate, etc. Thus, in the prior art, there is room for improvement in connecting the piezoelectric element to the substrate.

[0008] An object of non-limiting embodiments of the present invention is to provide a piezoelectric element connection structure, a vehicle, and a piezoelectric element connection method that can easily connect a piezoelectric element to a substrate.

[0009] Solutions to the problem

[0010] A piezoelectric element connection structure of one embodiment of the present invention comprises: a main body having a substrate setting area; a shell having a bottom surface and fixedly connected to the main body in a manner opposite to the substrate setting area; a piezoelectric element arranged on the bottom surface; and a winding-shaped coil wire extending from the piezoelectric element to the substrate setting area to electrically connect the piezoelectric element to the substrate.

[0011] A piezoelectric element connection structure according to an embodiment of the present invention comprises: a main body having a substrate setting area; a shell having a bottom surface and fixedly connected to the main body in a manner opposite to the substrate setting area; the shell having a bottom surface opposite to the substrate setting area; a piezoelectric element set on the bottom surface; a wire extending from the piezoelectric element to the substrate setting area and electrically connecting the piezoelectric element to the substrate; and a wire guide having a mortar-shaped opening formed thereon for guiding the end of the coil.

[0012] A vehicle according to an embodiment of the present invention includes the above-mentioned piezoelectric element connection structure.

[0013] A piezoelectric element connection method according to an embodiment of the present invention comprises the following steps: for an end portion of a winding-shaped coil wire extending from a piezoelectric element toward a setting area of ​​a substrate, the end portion is brought into contact with an inclined surface of a wire guide having a mortar-shaped opening and the end portion is guided to the top of the mortar-shaped opening, and the end portion is passed through the setting area of ​​the substrate, the piezoelectric element is fixed to the bottom surface of a shell, and the shell is fixedly connected to a main body having the setting area of ​​the substrate; and the end portion of the coil wire is connected to a wiring pattern of the substrate.

[0014] Effects of the Invention

[0015] According to one embodiment of the present invention, a piezoelectric element connection structure, a vehicle, and a piezoelectric element connection method capable of easily connecting a piezoelectric element to a substrate can be constructed.

[0016] More advantages and effects of an embodiment of the present invention will be explained through the description and the drawings. These advantages and / or effects are provided by several implementations, and the features described in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a diagram showing a structural example of a piezoelectric element connection structure 100 according to an embodiment of the present invention.

[0018] Figure 2 yes Figure 1 A partial enlarged view of the piezoelectric element connection structure 100 is shown.

[0019] Figure 3 It is a diagram for explaining an assembly procedure of a comparative example of the piezoelectric element connection structure 100 according to the embodiment of the present invention. DETAILED DESCRIPTION

[0020] Below, the preferred embodiments of the present invention are described in detail with reference to the accompanying drawings. In addition, in this specification and the accompanying drawings, the same reference numerals are given to the components having substantially the same functions, thereby omitting repeated descriptions. In the following figures, the shapes, thicknesses, lengths, etc. of the components shown respectively are appropriately changed for the convenience of making the drawings, and are therefore different from the shapes, thicknesses, lengths, etc. of the actual components. Furthermore, the materials of the components are not limited to those described in the present embodiment.

[0021] [Implementation Method]

[0022] Figure 1 It is a diagram showing a structural example of a piezoelectric element connection structure 100 according to an embodiment of the present invention. Figure 2 yes Figure 1 A partial enlarged view of the piezoelectric element connection structure 100 is shown.

[0023] The piezoelectric element connection structure 100 comprises: a resin shell 9; a shell 1 fixed to the shell 9 by means of a sleeve 10; a piezoelectric element 2 arranged inside the shell 1; and a substrate 5 fixed inside the shell 9 in a manner facing the piezoelectric element 2 and having a first surface 5a and a second surface 5b.

[0024] The piezoelectric element connection structure 100 includes two wire guides 7 and 8 fixed to the substrate 5 , the coil wire 3 extending from the piezoelectric element 2 to the wire guide 7 , and the coil wire 4 extending from the piezoelectric element 2 to the wire guide 8 .

[0025] The coil conductor 3 includes a spiral coil portion 3 a , a terminal portion 3 b connected to one end of the coil portion 3 a , and a terminal portion 3 c connected to the other end of the coil portion 3 a .

[0026] The terminal portion 3 b is inserted into the wire guide 7 and is electrically connected to the wiring pattern on the substrate 5 .

[0027] The wire guide 7 is inserted into the through hole 5c formed in the substrate 5 and is provided on the second surface 5b side of the substrate 5, and the second surface 5b of the substrate 5 faces the piezoelectric element 2. The wire guide 7 is a conical member having a mortar-shaped opening whose inner diameter increases as it goes from the substrate 5 to the piezoelectric element 2. The material of the wire guide 7 is, for example, an insulating resin. In addition, the material of the wire guide 7 is not limited to these, and for example, it may be a non-conductor other than resin.

[0028] The terminal portion 3 c is connected to the positive electrode of the piezoelectric element 2 by welding or the like.

[0029] For example, phosphor bronze wire, stainless steel wire, piano wire, or hard steel wire is used as the material of the coil conductor 3 .

[0030] The coil conductor 4 includes a spiral coil portion 4 a , a terminal portion 4 b connected to one end of the coil portion 4 a , and a terminal portion 4 c connected to the other end of the coil portion 4 a .

[0031] The terminal portion 4 b is inserted into the wire guide 8 and is electrically connected to the wiring pattern on the substrate 5 .

[0032] The wire guide 8 is inserted into the through hole 5c formed in the substrate 5 and is provided on the second surface 5b side of the substrate 5, similarly to the wire guide 7, and the second surface 5b of the substrate 5 faces the piezoelectric element 2. The wire guide 8 is a conical member having a mortar-shaped inner peripheral surface whose inner diameter increases as it moves from the substrate 5 to the piezoelectric element 2. The material of the wire guide 8 is the same as that of the wire guide 7. In addition, the shape of the wire guides 7 and 8 is not limited to a conical shape, and any shape may be used as long as it has the function of guiding the coil wires 3 and 4.

[0033] The terminal portion 4 c is connected to the connection member 1 b by welding, etc. The connection member 1 b is a conductive member formed inside the case 1 , and electrically connects the terminal portion 4 c and the negative electrode of the piezoelectric element 2 .

[0034] The coil conductor 4 is made of the same material as the coil conductor 3 .

[0035] Next, a method for assembling the piezoelectric element connection structure 100 will be described. The substrate 5 is fixed to the inner wall surface of the housing 9 .

[0036] Next, the wire guides 7 and 8 are arranged on the second surface 5b side of the substrate 5, and are pressed into the through holes 5c of the substrate 5. Thus, the wire guides 7 and 8 are fixed to the substrate 5. In addition, the wire guides 7 and 8 may be connected to the housing 9 via ribs, for example.

[0037] Next, the piezoelectric element 2 is fixed to the bottom surface 1a of the case 1. The piezoelectric element 2 is fixed by, for example, an adhesive.

[0038] Next, the terminal portion 3c of the coil conductor 3 is connected to the piezoelectric element 2 by welding or the like. Also, the terminal portion 4c of the coil conductor 4 is connected to the connecting member 1b by welding or the like. At this time, the terminal portion 3b of the coil conductor 3 is arranged to extend in a direction perpendicular to the piezoelectric element 2. Also, the terminal portion 4b of the coil conductor 4 is arranged to extend in a direction perpendicular to the piezoelectric element 2.

[0039] Next, the case 1 is fitted into the housing 9 while the terminal portion 3 b of the coil conductor 3 faces the opening of the conductor guide 7 and the terminal portion 4 b of the coil conductor 4 faces the opening of the conductor guide 8 .

[0040] At this time, the terminal portion 3b of the coil conductor 3 contacts the inclined surface of the opening of the conductor guide 7 and is guided to the top of the mortar-shaped opening of the conductor guide 7, and reaches the first surface 5a side of the substrate through the through hole formed in the center of the conductor guide 7. Similarly, the terminal portion 4b of the coil conductor 4 contacts the inclined surface of the opening of the conductor guide 8 and is guided to the top of the mortar-shaped opening of the conductor guide 8, and reaches the first surface 5a side of the substrate through the through hole formed in the center of the conductor guide 8.

[0041] The terminal portion 3 b and the terminal portion 4 b reaching the first surface 5 a side of the substrate are electrically connected to the wiring pattern on the substrate 5 by soldering.

[0042] Figure 3 It is a diagram for explaining an assembly procedure of a comparative example of the piezoelectric element connection structure 100 according to the embodiment of the present invention.

[0043] When manufacturing the piezoelectric element connection structure 100A of the comparative example, first, one end of the wire 20 is connected to the piezoelectric element 2 . The wire 20 is a bonding wire or the like. The other end of the wire 20 is connected to the conductor 22 of the metal terminal 21 .

[0044] Next, the lead wire 20 is bent to change the direction of the surface of the piezoelectric element 2 by 90 degrees, and the piezoelectric element 2 is bonded to the bottom surface 1 a of the case 1 using an adhesive or the like. Furthermore, the metal terminal 21 is fixed to the substrate in the case 9 .

[0045] In the piezoelectric element connection structure 100A, since the bonding wire that is easily plastically deformed is used, the lead wire 20 connected to the piezoelectric element 2 cannot stand on its own in the vertical direction and bends. Therefore, the piezoelectric element 2 is connected to the substrate by connecting the metal terminal 21 to the substrate in the housing 9 after the metal terminal 21 is connected to the lead wire 20 in advance.

[0046] Thus, since a process of connecting the metal terminal 21 to the lead wire 20 is required, the structure of the piezoelectric element connection structure 100A becomes complicated. In addition, the metal terminal 21 needs to be fixed to the substrate in the housing 9 .

[0047] In contrast, in the piezoelectric element connection structure 100 of the present embodiment, since the coil wire 3 is formed into a spiral shape, when the coil wire 3 is connected to the substrate 5, even if stress is applied to the coil wire 3 in a direction orthogonal to the axial direction of the coil wire 3, the coil wire 3 as a whole is not easily deformed due to the restoring force of the coil wire 3. In addition, since a spring material is used in the coil wire 3, it is not easily deformed due to the material property.

[0048] Therefore, the coil wire 3 can be easily inserted into the wire guide 7 to connect the coil wire 3 to the substrate 5 while suppressing the coil wire 3 provided perpendicular to the piezoelectric element 2 from bending. The same applies to the coil wire 4.

[0049] This eliminates the need for a step of preparing a component corresponding to the above-mentioned metal terminal 21 and connecting it to the coil conductor 3 , and thus the structure of the piezoelectric element connection structure 100 can be simplified.

[0050] In addition, since the metal terminal 21 is not required, there is no need to weld the coil wire 3 to the part corresponding to the metal terminal 21, which can shorten the assembly time of the piezoelectric element connection structure 100 and reduce the number of welding locations, thereby improving the reliability of the piezoelectric element connection structure 100.

[0051] Furthermore, by using the wire guide 7 , the connection work of the coil wire 3 to the substrate 5 becomes easier than when the coil wire 3 is inserted into the through hole 5 c of the substrate 5 without using the wire guide 7 .

[0052] Furthermore, by using the wire guide 7 , even when the coil wire 3 is slightly inclined with respect to the vertical direction, the coil wire 3 and the substrate 5 can be easily connected.

[0053] In the present embodiment, the piezoelectric element connection structure 100 including the coil wires 3 and 4 and the wire guides 7 and 8 is described. However, the configuration example of the piezoelectric element connection structure 100 is not limited thereto.

[0054] For example, the piezoelectric element connection structure 100 may be configured so that the coil wires 3 and 4 are directly connected to the substrate 5 without using the wire guides 7 and 8 .

[0055] In such a configuration, when stress is applied to the coil wires 3 and 4 in a direction orthogonal to their axial directions, the coil wires 3 and 4 are not easily plastically deformed due to the restoring force of the coil wires 3 and 4, and thus it is easy to connect to the substrate 5. In this case, the coil wires 3 and 4 are inserted into the through holes 5c formed in the substrate 5.

[0056] In addition, the piezoelectric element connection structure 100 may be configured such that, instead of the coil wire 3 and the coil wire 4 , a linear or crank-shaped wire is inserted into the wire guide 7 and the wire guide 8 .

[0057] In such a configuration, even if the straight wire is slightly inclined relative to the vertical direction, the wire can be guided to the substrate 5, so that connection to the substrate 5 becomes easy. In addition, by using the coil wire 3 and the coil wire 4, the vibration generated in the piezoelectric element 2 is absorbed by the coil wire 3 and the coil wire 4, so that the vibration generated in the piezoelectric element 2 can be prevented from being transmitted to the substrate 5.

[0058] For example, the following aspects also belong to the technical scope of the present invention.

[0059] (1) A piezoelectric element connection structure comprises: a main body having a substrate setting area; a shell having a bottom surface and fixedly connected to the main body in a manner opposite to the substrate setting area; a piezoelectric element set on the bottom surface; and a winding-shaped coil conductor extending from the piezoelectric element to the substrate setting area to electrically connect the piezoelectric element to the substrate.

[0060] (2) The piezoelectric element connection structure further includes a wire guide having a mortar-shaped opening for guiding the end of the coil wire.

[0061] (3) A piezoelectric element connection structure comprises: a main body having a substrate installation area; a shell having a bottom surface and fixedly connected to the main body in a manner opposite to the substrate installation area; the shell having a bottom surface opposite to the substrate installation area; a piezoelectric element installed on the bottom surface; a wire extending from the piezoelectric element to the substrate installation area and electrically connecting the piezoelectric element to the substrate; and a wire guide having a mortar-shaped opening formed on the wire guide for guiding the end of the coil.

[0062] (4) The conductor is a coil conductor in a winding shape.

[0063] (5) A vehicle includes the above-mentioned piezoelectric element connection structure.

[0064] (6) A piezoelectric element connection method comprising the following steps: a step of bringing an end portion of a winding-shaped coil wire extending from a piezoelectric element toward a setting area of ​​a substrate on the setting area side of the substrate into contact with an inclined surface of a wire guide having a mortar-shaped opening and guiding the end portion to the top of the mortar-shaped opening, and passing the end portion through the setting area of ​​the substrate, the piezoelectric element being fixed to a bottom surface of a shell, the shell being fixedly connected to a main body having the setting area of ​​the substrate; and a step of connecting the end portion of the coil wire to a wiring pattern of the substrate.

[0065] The disclosure of Japanese Patent Application No. 2020-090640 filed on May 25, 2020, including the specification, drawings, and abstract, is incorporated herein by reference in its entirety.

[0066] Industrial Applicability

[0067] An embodiment of the present invention is suitable for use in a piezoelectric element connection structure and a vehicle.

[0068] Description of Reference Numerals

[0069] 1: Shell

[0070] 1a: Bottom

[0071] 1b: Connecting parts

[0072] 2: Piezoelectric element

[0073] 3: Coil wire

[0074] 3a: Coil part

[0075] 3b: Terminal part

[0076] 3c: Terminal part

[0077] 4: Coil wire

[0078] 4a: Coil part

[0079] 4b: Terminal part

[0080] 4c: Terminal part

[0081] 5: Substrate

[0082] 5a: Surface (first surface)

[0083] 5b: Side (Second Side)

[0084] 5c: Through hole

[0085] 7: Wire guide

[0086] 8: Wire guide

[0087] 9: Shell

[0088] 10: Casing

[0089] 20: Wire

[0090] 21: Metal terminal

[0091] 22: Conductor

[0092] 100: Piezoelectric element connection structure

[0093] 100A: Piezoelectric element connection structure

Claims

1. A piezoelectric element connection structure, comprising: A main body having a substrate placement area; A housing having a bottom surface and fixedly connected to the main body in a manner opposite to the arrangement area of ​​the substrate; a piezoelectric element disposed on the bottom surface; as well as a coil conductor extending from the piezoelectric element to the installation area of ​​the substrate, electrically connecting the piezoelectric element and the substrate, and having a straight line portion without bending and a spiral portion, The coil conductor is made of a spring material that is not easily deformed by plasticity.

2. The piezoelectric element connection structure according to claim 1, wherein: The invention further comprises a wire guide having a mortar-shaped opening for guiding the end of the coil wire. 3 . A vehicle comprising the piezoelectric element connection structure according to claim 1 .

4. A piezoelectric element connection method, comprising the following steps: A step of guiding an end portion of a coil wire having an unbent straight portion and a spiral portion extending from a piezoelectric element toward a substrate installation region on the substrate installation region side by bringing the end portion into contact with an inclined surface of a wire guide having a mortar-shaped opening and guiding the end portion to a top of the mortar-shaped opening to pass the end portion through the substrate installation region, wherein the piezoelectric element is fixed to a bottom surface of a housing, and the housing is fixedly connected to a main body having the substrate installation region; as well as a step of connecting the end of the coil conductor to the wiring pattern of the substrate, The coil conductor is made of a spring material that is not easily deformed by plasticity.

Images