JP5023244B1 - Vibration power generator - Google Patents

Abstract

An object of the present invention is to provide a vibration power generator capable of improving the power generation efficiency of a piezoelectric element.
A vibration force power generation device is a vibration force power generation device that generates power by pressure fluctuation caused by vibration, and includes a piezoelectric element and a vibration plate that transmits vibration to the piezoelectric element. A notch portion 21 is formed on at least one side surface of the piezoelectric element 20, and the piezoelectric element 10 is disposed on a portion of the diaphragm 20 on the side opposite to the side surface where the notch portion 21 is provided, corresponding to the notch portion 21. ing.
[Selection] Figure 2

Description

  The present invention relates to a vibration power generator.

  Conventionally, a power generation device using a piezoelectric element is known. The power generation device generates power by deforming the piezoelectric element by applying a force to the piezoelectric element from the outside in some way. In order to deform the piezoelectric element, for example, it is considered to deform the piezoelectric element by applying pressure by vibration, wind force, or the like (see, for example, Patent Document 1 and Patent Document 2).

JP 7-49388 A JP-A-11-303726

  However, the conventional power generation apparatus described above has room for improvement with respect to the power generation efficiency of the piezoelectric element. For example, when the diaphragm is joined so as to cover at least one side surface of the piezoelectric element, and the material of the diaphragm is harder than the material of the piezoelectric element, or the thickness of the piezoelectric element vibrates If the thickness is greater than the thickness of the plate, the diaphragm is difficult to deform, and the amount of deformation of the piezoelectric element is reduced accordingly, which causes a problem that the power generation efficiency of the piezoelectric element is reduced.

  This invention is made | formed in view of the above, Comprising: It aims at providing the oscillating force power generator which can improve the electric power generation efficiency of a piezoelectric element.

In order to solve the above-described problems and achieve the object, the vibration power generation device according to claim 1 is a vibration force power generation device that generates power by pressure fluctuation caused by vibration, and includes vibrations generated in the piezoelectric element and the piezoelectric element. A diaphragm that transmits the piezoelectric element, a notch is formed on at least one side of the diaphragm, and the piezoelectric element is disposed on a side of the diaphragm opposite to the side on which the notch is provided. It arrange | positions in the part corresponding to the said notch part, and provided the level | step-difference part in at least one part of the side surface of the said notch part.

The vibration power generation device according to claim 2 is the vibration power generation device according to claim 1, wherein the step portion and the diaphragm are integrally formed with each other.

According to a third aspect of the present invention, there is provided the vibration power generation apparatus according to the first or second aspect , wherein when the deformation of the piezoelectric element reaches a predetermined amount on the diaphragm, Deformation adjusting means for adjusting the deformation is provided.

According to the vibration power generation device of the first aspect, since the piezoelectric element is arranged in a portion corresponding to the notch portion of the side surface of the diaphragm opposite to the side surface on which the notch portion is provided, the notch Compared to a structure in which no part is provided, the deformation of the piezoelectric element can be promoted, and the power generation efficiency of the piezoelectric element can be improved. In addition, since the step portion is provided on at least a part of the side surface of the cutout portion, it is possible to make it difficult to cause cracks, cracks, or the like in portions corresponding to the cutout portion in the piezoelectric element or the diaphragm. The power generation efficiency of the piezoelectric element can be improved while ensuring a certain durability.

In addition, according to the vibration power generation device of the second aspect , since the step portion and the diaphragm are integrally formed with each other, the trouble of attaching the vibration plate to the step portion can be saved. Manufacturability can be improved.

According to the vibration power generation apparatus of the third aspect , the vibration plate is provided with the deformation adjusting means for adjusting the deformation of the piezoelectric element when the deformation of the piezoelectric element reaches a predetermined amount. Excessive tensile deformation can be suppressed, and cracking of the piezoelectric element due to the tensile deformation can be prevented.

It is a whole perspective view of the outline of the sound insulation wall for roads to which the vibration power generator concerning Embodiment 1 was applied instead of the sound absorption part. It is an AA arrow sectional view of Drawing 1, (a) is a state before a vibration power generation device receives external force, (b) is an external force along the direction where a vibration power generation device goes to the outside from the inside of a road. (C) is a figure which shows the state which received the external force along the direction which the vibration power generation device goes to the inside from the outer side of a road. It is AA arrow sectional drawing of the vibration power generator which concerns on Embodiment 2, (a) is the state before a vibration power generator receives external force, (b) is a vibration power generator from the inside of a road. FIG. 5C is a diagram showing a state in which an external force is received along a direction toward the outside, and FIG. 8C is a diagram illustrating a state in which the vibration power generation apparatus receives an external force along a direction from the outside to the inside of the road. It is AA arrow sectional drawing of the vibration power generator which concerns on Embodiment 3, (a) is the state before a vibration power generator receives external force, (b) is a vibration power generator from the inside of a road. FIG. 5C is a diagram showing a state in which an external force is received along a direction toward the outside, and FIG. 8C is a diagram illustrating a state in which the vibration power generation apparatus receives an external force along a direction from the outside to the inside of the road. It is AA arrow sectional drawing of the vibration power generator which concerns on Embodiment 4, (a) is the state before a vibration power generator receives external force, (b) is a vibration power generator from the inside of a road. FIG. 5C is a diagram showing a state in which an external force is received along a direction toward the outside, and FIG. 8C is a diagram illustrating a state in which the vibration power generation apparatus receives an external force along a direction from the outside to the inside of the road.

  Embodiments of a vibration power generator according to the present invention will be described below in detail with reference to the accompanying drawings. However, the present invention is not limited by these embodiments.

[Embodiment 1]
First, the first embodiment will be described. This form is a form in which a notch having a cutting gap is formed on at least one side surface of the diaphragm.

(Constitution)
The application target of the vibration power generation device according to Embodiment 1 is, for example, the sound absorbing portion of the sound insulation wall, the vicinity of the sound collection portion of the mobile phone, and the like, but in the following, the vibration power generation device is applied to the sound absorption portion of the sound insulation wall for the road This will be described as an example.

  First, the configuration of the vibration power generator according to Embodiment 1 will be described. FIG. 1 is a schematic overall perspective view of a road sound insulating wall to which the vibration power generation apparatus according to Embodiment 1 is applied instead of a sound absorbing portion. 2 is a cross-sectional view taken along the line A-A in FIG. 1, (a) is a state before the vibration power generator is subjected to external force, and (b) is a direction in which the vibration power generator is directed from the inside to the outside of the road. The state which received external force along (c) is a figure which shows the state which received the external force along the direction which a vibration power generation device goes inside from the outer side of a road. In the following description, the X direction in FIG. 1 is the longitudinal direction of the vibration power generator, the Y direction in FIG. 1 is the lateral direction of the vibration power generator, and the Z direction in FIG. 1 is the height direction of the vibration power generator. To do. Also. As shown in FIG. 1, a plurality of vibration power generation devices 1 each including a piezoelectric element 10 and a diaphragm 20 are provided on a sound insulation wall for roads, and these vibration power generation devices 1 are identical to each other. To do. Therefore, in the following, the main part of the vibration power generation device 1 shown in FIG. 2 (hereinafter referred to as “vibration force power generation device 1”) will be described.

(Configuration-Piezoelectric element)
As shown in FIG. 2, the piezoelectric element 10 is an element that generates electricity by being deformed by pressure. For example, the piezoelectric element 10 is composed of piezoelectric ceramics such as barium titanate and zirconia, and piezoelectric single crystals such as lithium tantalate (LiTaO 3). . Further, all the piezoelectric elements 10 provided in the vibration power generation device 1 are formed in the same thin plate shape and thickness.
Although not shown, the piezoelectric element 10 has a plus terminal on one side of the piezoelectric element 10 and a minus terminal on the other side of the piezoelectric element 10, and a plus lead wire connected to the plus terminal. The minus lead wire connected to the minus terminal is drawn out and connected to the external device via a control circuit (not shown), whereby electric power is supplied to the external device. However, various electric elements such as a known bridge circuit may be disposed between the piezoelectric element 10 and the load. Alternatively, as the piezoelectric element 10 or in place of the piezoelectric element 10, any material that can generate electric power by external force (including a force that causes distortion, bending, or compression) can be used. Ionic polymer metal composite material (IPMC: Ionic Polymer-Metal Composite) in which metal (gold) is plated on both surfaces of a molecular film (gel), ion conductive polymer gel film (ICPF: Ionic Conducting Polymer Gel Film), Alternatively, artificial muscles using these IPMC and ICPF can be used. This point is the same in other embodiments described later. Details of installation of the piezoelectric element 10 will be described later.

(Configuration-diaphragm)
The diaphragm 20 is a support that applies stress to the piezoelectric element 10. The diaphragm 20 is made of a steel material having flexibility and durability, such as a stainless steel thin plate. These diaphragms 20 are formed with the same square plate shape and thickness.
Here, specifically, in the first embodiment, as shown in FIG. 2A, the shape of the diaphragm 20 is such that the diaphragm 20 can repeatedly vibrate with a large amplitude. The length in the direction is longer than the length of the piezoelectric element 10 in the Y direction, and the length of the diaphragm 20 in the Z direction is substantially the same as the length of the piezoelectric element 10 in the Z direction. As for the thickness of the diaphragm 20, specifically, in the first embodiment, as shown in FIG. 2A, the thickness of the diaphragm 20 is made thicker than the thickness of the piezoelectric element 10. .

  Further, as shown in FIG. 2A, the diaphragm 20 is provided so as to come into contact with the side surface on the bottom surface side of the piezoelectric element 10, and is joined to the piezoelectric element 10 by an adhesive, a fixture, or the like. ing.

Further, as shown in FIG. 2A, a notch 21 having a cutting gap is formed on the side surface on the bottom surface side of the diaphragm 20 (note that the notch 21 is formed in the Z direction of the diaphragm 20. Formed from one end to the other end). The notch 21 is a deformation increasing means for increasing the deformation of the piezoelectric element 10. The notch 21 is formed in a rectangular concave shape (or is not limited thereto, and may be formed in, for example, a triangular concave shape, an arc concave shape, etc.), and is formed at the center in the Y direction on the side surface on the bottom surface side of the diaphragm 20. Has been placed.
Here, the shape of the notch 21 is preferably a shape in which the piezoelectric element 10 can stably vibrate with the amplitude calculated from the design power generation amount. Specifically, in the first embodiment, FIG. As shown in FIG. 3, the length of the notch 21 in the X direction is about half the thickness of the diaphragm 20, and the length of the notch 21 in the Y direction is shorter than the length of the piezoelectric element 10 in the Y direction. A notch 21 is formed.

(Details of installation of piezoelectric element)
Next, details of installation of the piezoelectric element 10 according to the first embodiment will be described. As shown in FIG. 2A, in the first embodiment, the piezoelectric element 10 has a side surface (for example, shown in FIG. 2A) opposite to the side surface of the diaphragm 20 where the notch 21 is provided. Thus, it arrange | positions in the part corresponding to the notch part 21 among the side surfaces of the flat side of the diaphragm 20).
Here, “the portion corresponding to the cutout portion of the side surface of the diaphragm opposite to the side where the cutout portion is provided” refers to the portion of the side surface of the diaphragm 20 where the piezoelectric element 10 is easily deformed, In the case where the diaphragm 20 is vibrating, when the diaphragm 20 is bent upward or downward, the side surface of the diaphragm 20 on the side opposite to the side where the notch 21 is provided. It means a portion that overlaps with the side surface of the cutout portion 21. Specifically, in the first embodiment, as shown in FIGS. 2A and 2B, when the diaphragm 20 is bent downward in a convex shape, among the side surfaces on the plane side of the diaphragm 20 The piezoelectric element 10 is disposed on the bottom surface of the notch 21, the left wall surface of the notch 21, and the portion overlapping the right wall surface of the notch 21. Alternatively, the piezoelectric element 10 is not limited to this. For example, the piezoelectric element 10 is placed on the bottom surface of the cutout portion 21, the left wall surface of the cutout portion 21, or the portion overlapping the right wall surface of the cutout portion 21 of the side surface on the plane side of the diaphragm 20. It may be arranged.

(Function of vibration power generator)
The function of the vibration power generation apparatus 1 configured as described above is as follows. First, when the vibration power generation device 1 is applied to the sound absorbing portion of the sound insulation wall, the vibration plate 20 is vibrated and deformed by sound energy of noise generated by a vehicle traveling on the road, and the piezoelectric material is deformed by the deformation of the vibration plate 20. The element 10 can be deformed to generate power. As described above, since power generation can be performed in addition to absorbing noise, this power generation can be used for any purpose (for example, used as a power source for road lighting or road signs).

  In particular, as shown in FIGS. 2B and 2C, the piezoelectric element 10 is disposed at a portion corresponding to the notch 21 on the side surface on the plane side of the diaphragm 20. The deformation of the piezoelectric element 10 can be promoted as compared with a structure that is not provided.

(effect)
As described above, according to the first embodiment, the piezoelectric element 10 is disposed in a portion corresponding to the notch 21 in the side surface on the plane side of the diaphragm 20, and thus the structure in which the notch 21 is not provided. As compared with the above, the deformation of the piezoelectric element 10 can be promoted, and the power generation efficiency of the piezoelectric element 10 can be improved.

[Embodiment 2]
Next, a second embodiment will be described. This form is a form in which a step portion is provided on at least a part of the side surface of the cutout portion. In addition, about the component similar to Embodiment 1, the same code | symbol or name as used in Embodiment 1 is attached | subjected as needed, and the description is abbreviate | omitted.

(Constitution)
First, the configuration of the vibration power generator according to Embodiment 2 will be described. 3 is a cross-sectional view of the vibration power generator according to the second embodiment taken along the line AA, where (a) is a state before the vibration power generator is subjected to external force, and (b) is a road where the vibration power generator is road. (C) is a figure which shows the state which received the external force along the direction which goes to the outside from the inner side of a road, and (c) the vibration power generation device received the direction which goes to the inner side from the outer side of the road. As shown in these drawings, the vibration power generation apparatus 101 according to the second embodiment is configured by further adding a step portion 22 to the components of the vibration power generation apparatus 1 of the first embodiment.

  The step portion 22 is a local deformation adjusting means for locally adjusting the deformation of the piezoelectric element 10. The step portion 22 is formed in a rectangular shape with the same material as the diaphragm 20 (or may be formed in a wave shape or the like). Further, as shown in FIG. 3A, the stepped portion 22 is provided on the bottom surface of the notch portion 21 (note that the stepped portion 22 extends from one end of the bottom surface in the Z direction to the other end. Provided over the end).

Here, the configuration of the stepped portion 22 is preferably a configuration capable of improving the manufacturability of the vibration power generation apparatus 101. Specifically, in the second embodiment, FIGS. 3A and 3B are used. As shown, the step portion 22 is formed integrally with the diaphragm 20. Or it is not restricted to this, For example, the level | step-difference part 22 may be formed separately from the diaphragm 20 so that the number, arrangement | positioning, etc. of the level | step-difference part 22 can be changed arbitrarily according to an installation condition. In this case, the step portion 22 is joined to the diaphragm 20 with an adhesive, a fixture, or the like.
As for the shape and number of the stepped portions 22, specifically, in the first embodiment, as shown in FIG. 3A, the portions corresponding to the notches 21 in the piezoelectric element 10 and the diaphragm 20 are cracked. In order to prevent the occurrence of cracks and the like, the length of the stepped portion 22 in the Y direction is about 1/5 of the length of the notched portion 21 in the Y direction, and the length of the stepped portion 22 in the X direction is set to the diaphragm 20. Two step portions 22 formed with about ¼ of the thickness are provided. The thickness of the stepped portion 22 may be substantially the same as the thickness of the diaphragm 20, for example.
As for the number of steps of the stepped portion 22, specifically, in the first embodiment, the stepped portion 22 is formed in a single step as shown in FIG. Or it is not restricted to this, In order to make it easier to adjust the deformation | transformation of the piezoelectric element 10, you may form in multiple steps.

(Function of vibration power generator)
The function of the vibration power generation apparatus 101 configured as described above is as follows. As shown in FIGS. 3B and 3C, since the plurality of step portions 22 are provided on the bottom surface of the notch portion 21, the rigidity of the portion corresponding to the step portion 22 in the piezoelectric element 10 or the diaphragm 20 is improved. It is possible to prevent cracks, cracks, and the like from occurring in portions corresponding to the notches 21 in the piezoelectric element 10 and the diaphragm 20.

(effect)
As described above, according to the second embodiment, since the step portion 22 is provided on the bottom surface of the notch portion 21, the step portion is provided on at least a part of the side surface of the notch portion. It is possible to prevent cracks, cracks, and the like from occurring in the portion where the notch 21 is provided, and to improve the power generation efficiency of the piezoelectric element 10 while ensuring a certain durability in the piezoelectric element 10 and the diaphragm 20. it can.

  In addition, since the step portion 22 and the diaphragm 20 are integrally formed with each other, the trouble of attaching the diaphragm 20 to the step portion 22 can be saved, and the manufacturability of the vibration power generator 101 can be improved.

[Embodiment 3]
Next, Embodiment 3 will be described. In this form, a deformation adjusting means is provided on the diaphragm. In addition, about the component similar to Embodiment 3, the same code | symbol or name as used in Embodiment 1 is attached | subjected as needed, and the description is abbreviate | omitted.

(Constitution)
First, the configuration of the vibration power generator according to Embodiment 3 will be described. 4A and 4B are cross-sectional views of the vibration power generation device according to the third embodiment, taken along the line AA. FIG. 4A is a state before the vibration power generation device receives an external force, and FIG. (C) is a figure which shows the state which received the external force along the direction which goes to the outside from the inner side of a road, and (c) the vibration power generation device received the direction which goes to the inner side from the outer side of the road. As shown in these drawings, the vibration power generation device 201 according to the third embodiment is configured by further adding deformation adjusting units 23a and 23b to the components of the vibration power generation device 1 of the first embodiment. ing.

  The deformation adjusting units 23a and 23b are deformation adjusting means for adjusting the deformation of the piezoelectric element 10 when the deformation of the piezoelectric element 10 reaches a predetermined amount. As shown in FIG. 4A, the deformation adjusting portion 23 a is provided on the left wall surface of the notch portion 21, and the deformation adjusting portion 23 b is provided on the right wall surface of the notch portion 21.

Here, the configuration of the deformation adjusting units 23a and 23b is preferably a configuration capable of improving the manufacturability of the vibration power generation apparatus 201. Specifically, in the third embodiment, the configuration shown in FIG. As described above, the deformation adjusting portion 23 a is integrally formed with the left wall surface of the notch portion 21, and the deformation adjusting portion 23 b is integrally formed with the right wall surface of the notch portion 21. Or it is not restricted to this, The deformation | transformation adjustment parts 23a and 23b may be formed separately from the diaphragm 20. As shown in FIG.
As for the arrangement of the deformation adjusting portions 23a and 23b, specifically, in the third embodiment, as shown in FIG. 4A, the deformation adjusting portion 23a is arranged below the left wall surface of the notch portion 21. In addition, the deformation adjusting portion 23 b is disposed below the right wall surface of the notch portion 21. Then, as shown in FIGS. 4A and 4C, when the tensile deformation of the piezoelectric element 10 reaches a predetermined amount, the deformation adjustment portions 23a and 23b are brought into contact with each other so that the deformation adjustment portions 23a and 23b come into contact with each other. Are arranged at opposite positions.

(Function of vibration power generator)
The function of the vibration power generation apparatus 201 configured as described above is as follows. As shown in FIGS. 4B and 4C, in the vibration power generation apparatus 201, the deformation adjustment portion 23 a is formed on the left wall surface of the cutout portion 21, and the deformation adjustment portion 23 b is formed on the right wall surface of the cutout portion 21. Therefore, only when the tensile deformation of the piezoelectric element 10 reaches a predetermined amount, the deformation adjusting portions 23a and 23b are brought into contact with each other. Accordingly, excessive tensile deformation of the piezoelectric element 10 can be suppressed while allowing compression deformation of the piezoelectric element 10 freely.

(effect)
As described above, according to the third embodiment, since the deformation adjusting portion 23a is provided on the left wall surface of the notch portion 21 and the deformation adjusting portion 23b is provided on the right wall surface of the notch portion 21, excessive tensile deformation of the piezoelectric element 10 is caused. It can suppress, and the crack of the piezoelectric element 10 by the said tensile deformation, etc. can be prevented.

[Embodiment 4]
Next, a fourth embodiment will be described. This form is a form in which a notch having substantially no cutting gap is formed on at least one side surface of the diaphragm 20. In addition, about the component substantially the same as Embodiment 4, the same code | symbol or name as used in Embodiment 1 is attached | subjected as needed, and the description is abbreviate | omitted.

(Constitution)
First, the configuration of the vibration power generator according to Embodiment 4 will be described. 5A and 5B are cross-sectional views of the vibration power generation device according to the fourth embodiment, taken along line AA, where FIG. 5A is a state before the vibration power generation device receives an external force, and FIG. (C) is a figure which shows the state which received the external force along the direction which goes to the outside from the inner side of a road, and (c) the vibration power generation device received the direction which goes to the inner side from the outer side of the road. As shown in these drawings, the vibration power generation apparatus 301 according to the fourth embodiment is configured by the same components as those of the vibration power generation apparatus 1 of the first embodiment.

  Here, as shown in FIG. 5A, a notch 21 having substantially no cutting gap is formed on the side surface on the bottom surface side of the diaphragm 20 (the notch 21 is the Z in the diaphragm 20). Formed from one end of the direction to the other end). The notch 21 is formed in a substantially straight line so as to be orthogonal to the side surface on the bottom surface side of the diaphragm 20, and is arranged at the center in the Y direction on the side surface on the bottom surface side of the diaphragm 20.

(Function of vibration power generator)
The function of the vibration power generation device 301 configured as described above is as follows. As shown in FIGS. 5B and 5C, in the vibration power generation apparatus 301, the piezoelectric element 10 is provided with a notch 21 having substantially no cutting gap on the side surface on the bottom surface side of the diaphragm 20. If it tries to bend upward in a convex shape, the left wall surface and the right wall surface of the notch 21 are brought into contact with each other. Accordingly, excessive tensile deformation of the piezoelectric element 10 can be suppressed while allowing compression deformation of the piezoelectric element 10 freely.

(effect)
As described above, according to the fourth embodiment, since the notch 21 having substantially no cutting gap is provided on the side surface on the bottom surface side of the diaphragm 20, excessive tensile deformation of the piezoelectric element 10 can be suppressed. The cracking of the piezoelectric element 10 due to the tensile deformation can be prevented.

[Modifications to Embodiment]
Although the embodiments of the present invention have been described above, the specific configuration and means of the present invention can be arbitrarily modified and improved within the scope of the technical idea of each invention described in the claims. Can do. Hereinafter, such a modification will be described.

(About problems to be solved and effects of the invention)
First, the problems to be solved by the invention and the effects of the invention are not limited to the above-described contents, and the present invention solves the problems not described above or has the effects not described above. There are also cases where only some of the described problems are solved or only some of the described effects are achieved.

(Combination of each embodiment)
The structures shown in the embodiments can be combined with each other. For example, the vibration power generation device 1 in the first embodiment, the vibration power generation device 101 in the second embodiment, the vibration power generation device 201 in the third embodiment, or the vibration in the fourth embodiment is applied to the sound absorbing portion of the road noise barrier. A combination of the power generation devices 301 may be applied.
Further, for example, the vibration power generation apparatus 101 in the second embodiment and the deformation adjustment units 23a and 23b of the vibration power generation apparatus 201 in the third embodiment may be combined. Alternatively, the vibration power generation device 301 in the fourth embodiment and the step portion 22 of the vibration power generation device 101 in the second embodiment may be combined. In this case, for example, the cutout portion 21 of the vibration power generation device 301 may be formed in a substantially sawtooth shape so as to be orthogonal to the side surface on the bottom surface side of the diaphragm 20.

(About piezoelectric elements)
In each embodiment, it has been described that the piezoelectric element 10 provided in the vibration power generation device 1 is formed with the same thin plate shape and thickness, but is not limited thereto, for example, the same shape and It may be formed in a rectangular shape having a thickness (for example, a triangle, a pentagon, etc.), a fan shape, a circular shape, or the like. Or you may form in the square shape etc. which have a different shape and thickness.

  In each embodiment, it has been described that one piezoelectric element 10 is provided for one vibration plate 20. For example, a plurality of piezoelectric elements 10 are provided for one vibration plate 20. May be provided. In this case, for example, a plurality of cutout portions 21 corresponding to the respective piezoelectric elements 20 may be formed on the side surface of the diaphragm 20.

(About the diaphragm)
In each embodiment, it has been described that the diaphragm 20 is formed with the same square plate shape and the same plate area and thickness. However, the present invention is not limited to this. For example, the diaphragm 20 has the same shape and thickness. You may form in shape (for example, a triangle, a pentagon, etc.), fan shape, circular shape, etc. Or you may form in the square shape etc. which have a different shape and thickness.

  In each embodiment, it has been described that the shape of the diaphragm 20 is larger than the shape of the piezoelectric element 10. For example, the shape of the diaphragm 20 is the same as or more than the shape of the piezoelectric element 10. (More specifically, the length of the diaphragm 20 in the Y direction may be the same as or smaller than the length of the piezoelectric element 10 in the Y direction). In addition, although it has been described that the thickness of the diaphragm 20 is greater than the thickness of the piezoelectric element 10, for example, the thickness of the diaphragm 20 may be the same as or thinner than the thickness of the piezoelectric element 10. .

  In each embodiment, the number of diaphragms 20 is described as one. However, for example, a combination of a plurality of diaphragms 20 may be used.

(About steps)
In the second embodiment, it has been described that the stepped portion 22 is provided on the bottom surface of the cutout portion 21, but is not limited thereto. For example, the step portion 22 may be provided on the right wall surface or the left wall surface of the notch portion 21. Or the level | step-difference part 22 may be provided in the bottom face of the notch part 21, the right side wall surface of the notch part 21, and the left side wall surface.

  Further, in the second embodiment, it has been described that the two stepped portions 22 are provided on the bottom surface of the cutout portion 21, but, for example, one stepped portion 22 may be provided, or two or more stepped portions 22 may be provided. Step portions may be provided.

  In the third embodiment, the deformation adjusting portion 23a is provided on the left wall surface of the notch 21 and the deformation adjusting portion 23b is provided on the right wall surface of the notch 21 to adjust the deformation of the piezoelectric element 10. For example, the deformation of the piezoelectric element 10 may be adjusted by adjusting the interval between the stepped portions 22 of the second embodiment.

DESCRIPTION OF SYMBOLS 1, 101, 201, 301 Vibration power generation apparatus 10 Piezoelectric element 20 Diaphragm 21 Notch part 22 Step part 23a, 23b Deformation adjustment part

Claims (3)

A vibration power generator that generates power by pressure fluctuation caused by vibration,
A piezoelectric element;
A vibration plate for transmitting vibration to the piezoelectric element;
Forming a notch on at least one side of the diaphragm;
The piezoelectric element is disposed in a portion corresponding to the notch portion of the side surface of the diaphragm opposite to the side surface on which the notch portion is provided ,
A step portion is provided on at least a part of the side surface of the notch,
Vibration power generator. The step portion and the diaphragm are integrally molded with each other,
The vibration power generation device according to claim 1. The vibration plate is provided with a deformation adjusting means for adjusting the deformation of the piezoelectric element when the deformation of the piezoelectric element reaches a predetermined amount.
The vibration power generation device according to claim 1 or 2 .

Images