JP2014204468A - Power generating apparatus including elastic body and method for manufacturing elastic body - Google Patents

Abstract

A power generation device including an elastic body capable of obtaining a large power generation is provided. A power generation device is disposed along a side surface of a base material having elasticity that causes compression deformation and tensile deformation on one side surface by receiving an external force. A piezoelectric film 40 in which a piezoelectric effect is generated in a compression region A that is compressively deformed with deformation and a tensile region B that is tensile-deformed, a first electrode 30 that is in contact with the first side surface of the piezoelectric film 40 on the substrate 20 side, The elastic body 10 includes the second electrode 50 in contact with the second side surface opposite to the first side surface of the conductive film 40, and the charge generated in the compression region A due to the piezoelectric effect of the piezoelectric film 40 and the tensile force The combined power is output without canceling out the charges generated in the region B. [Selection] Figure 1

Description

  The present invention relates to a power generation device including an elastic body and a method for manufacturing the elastic body.

  Patent document 1 is disclosing the conventional electric power generating apparatus. This power generation device includes a flat plate-like piezoelectric substrate, a common electrode formed on one side surface of the piezoelectric substrate, and a divided electrode divided into two formed on the other side surface. Each divided electrode has a detection unit and a lead-out unit that is continuous with the detection unit. The detection unit has a very large area compared to the lead-out unit. When this power generation device is used as a pressure detector, the piezoelectric substrate is deformed by tension at a portion where the detection portion is formed, and is compressed and deformed at a portion where the lead portion is formed. At this time, since the piezoelectric substrate generates charges having different polarities between the detection unit and the lead-out unit, the charges are offset. However, in this power generation device, since the detection unit has a very large area compared to the lead-out unit, charge cancellation can be suppressed and electric power can be output. For this reason, the pressure detector using this power generator can increase detection sensitivity.

Japanese Utility Model Publication No. 6-87838

  However, in the power generation device of Patent Document 1, the detection unit and the drawer unit are continuously formed. For this reason, in this power generation device, the charge generated in the detection unit and the charge generated in the lead-out unit cancel each other. Therefore, this power generation device cannot effectively output power that can be generated by the piezoelectric substrate.

  The present invention has been made in view of the above-described conventional situation, and it is an issue to be solved to provide a power generation device including an elastic body capable of obtaining a large power generation and a method for manufacturing the elastic body. Yes.

The power generation device of the present invention is a base material having elasticity that causes compression deformation and tensile deformation on one side surface by receiving an external force,
A piezoelectric film that is arranged along the one side surface of the base material, and that produces a piezoelectric effect in a compression region that compresses and deforms along with the deformation of the base material and a tensile region that undergoes tensile deformation,
A first electrode in contact with the first side surface of the piezoelectric film on the substrate side;
An elastic body having a second electrode in contact with a second side surface opposite to the first side surface of the piezoelectric film;
The combined electric power is output without the electric charges generated in the compression region and the electric charges generated in the tensile region canceling each other due to the piezoelectric effect of the piezoelectric film.

  This power generation device can output a combined power without the electric charge generated in the compression region and the electric charge generated in the tensile region being canceled out due to the piezoelectric effect of the piezoelectric film, so that a large power generation can be obtained. it can.

It is the schematic which shows the electric power generating apparatus of Example 1. FIG. It is a graph which shows the change of the output waveform in Example 1 and 2. It is the schematic which shows the electric power generating apparatus of Example 2. FIG. It is the schematic which shows the electric power generating apparatus of Example 3, and the graph which shows an output waveform. 6 is a schematic diagram illustrating a process of manufacturing an elastic first electrode of Example 3. FIG. It is the schematic which shows the 1st process of forming the piezoelectric film of Example 3 on a 1st electrode. It is the schematic which shows the 2nd process of forming the 2nd electrode of Example 3 on a piezoelectric film. FIG. 10 is a cross-sectional view illustrating deformation of an elastic body including a support portion according to a fourth embodiment. It is a top view which shows the deformation | transformation of the rectangular flat elastic body of Example 4, (A) provided the support part in the perimeter of the elastic body, (B) is 2 of the long side of an elastic body. A support portion is provided on the side, and (C) is a support portion provided at four corners of the elastic body. It is a top view which shows the deformation | transformation of the elastic body of the square-shaped flat plate of Example 4, (A) provided the support part in the perimeter of the edge of an elastic body, (B) is in the parallel position of an elastic body. A support portion is provided on two sides, and (C) is a support portion provided at four corners of the elastic body.

  A preferred embodiment of the present invention will be described.

  In the power generation device of the present invention, in the elastic body, the first electrode and the second electrode may be divided at a boundary between the compression region and the tension region. In this case, electric charges having different polarities can be output from the respective regions without canceling out charges generated in the compression region and charges generated in the tensile region due to the piezoelectric effect of the piezoelectric film. And this electric power generating apparatus can obtain big electric power generation by synthesize | combining the electric power output from each area | region of a piezoelectric film | membrane by rectifying etc.

  In the power generation device of the present invention, the elastic body may be formed by dividing the first electrode, the piezoelectric film, and the second electrode at a boundary between the compression region and the tension region. Also in this case, electric power having different polarities can be output from the respective regions without canceling out charges generated in the compression region and charges generated in the tensile region due to the piezoelectric effect of the piezoelectric film. And this electric power generating apparatus can obtain big electric power generation by synthesize | combining the electric power output from each area | region of a piezoelectric film | membrane by rectifying etc. In addition, when having such a configuration, a laminated body in which the first electrode, the piezoelectric film, and the second electrode are laminated in this order is created, and the laminated body is cut into a shape that matches the compression region and the tensile region. The elastic body can be formed by sticking on the substrate. Further, a plurality of the laminated bodies may be laminated.

  In the power generation device of the present invention, in the elastic body, the piezoelectric film may have opposite polarities in the compression region and the tension region. In this case, charges generated on the same side surface in the compression region and the tensile region can be made to have the same polarity by the piezoelectric effect of the piezoelectric film. For this reason, the elastic body itself can synthesize and output charges of the same polarity generated in the compression region and the tension region without canceling out the charges generated in the compression region and the tension region. Power generation can be obtained. Alternatively, the charge may be output only from the compression region.

  In this elastic body manufacturing method, an external electric field is reversed between the compression region and the tension region, while applying a piezoelectric film forming paint on the first electrode, and the compression region and the tension region are opposite. A first step of forming the piezoelectric film having polarity on the first electrode and a second step of forming the second electrode on the piezoelectric film may be provided. In this case, an elastic body having a piezoelectric film having opposite polarities in the compression region and the tensile region can be easily manufactured.

  The power generation device of the present invention includes a support portion that supports an edge of the elastic body, wherein one of the central portion and the outer portion of the elastic body is the compression region, and the other is divided into the tension region. obtain. In this case, when the power generation device is applied to a building material or the like having a support portion that supports the edge of the elastic body, the compression region and the tensile region are divided into a central portion and an outer portion of the base material. By dividing the region in this way and forming the first electrode, the second electrode, or the piezoelectric film, the charge generated in the compression region and the charge generated in the tensile region can be effectively output, and large power generation is possible. You can gain power.

  Next, Examples 1 to 4 embodying the power generator of the present invention will be described with reference to the drawings.

<Example 1>
As shown in FIG. 1, the power generation apparatus of Example 1 includes an elastic body 10 having a base material 20, a first electrode 30, a piezoelectric film 40, and a second electrode 50. The base material 20 is made of glass, resin, metal, or the like, and those used as building materials can be applied. This base material 20 has elasticity, and receives an external force, whereby one side surface (the upper side surface of the base material 20 in FIG. 1) is subjected to compression deformation in which the deformation direction is concave and tension in which the deformation direction is convex. Deformation occurs. FIG. 1 schematically shows an elastic body 10. For this reason, although the state which a compressive deformation and a tensile deformation generate | occur | produce in the base material 20 one place each is shown, the case where a compressive deformation and a tensile deformation generate | occur | produce in several places is considered similarly.

  The first electrode 30 is divided at the boundary between the portion of the base material 20 that undergoes compressive deformation and the portion that undergoes tensile deformation. That is, the piezoelectric film 40 is divided at the boundary between the compression region A that compresses and deforms as the base material 20 deforms and the tensile region B that undergoes tensile deformation. The first electrode 30 includes a compression region first electrode 31 that extends into the compression region A on the base material 20, and a tensile region first electrode 32 that extends into the tension region B on the base material 20. . These first electrodes 30 are located outside the edge of the piezoelectric film 40, and lead-out portions 31A, 32A made of copper or the like having conductive wires 71, 72 connected to rectifier circuits 61, 62 described later connected thereto. The conductive contact portions 31B and 32B formed from a conductive resin or the like that is in contact with the first side surface of the piezoelectric film 40 on the substrate 20 side (the lower side surface of the piezoelectric film 40 in FIG. 1). have. When the base material 20 receives an external force and undergoes compression deformation, the compression region first electrode 31 also undergoes compression deformation. Similarly, when the base material 20 receives an external force and undergoes tensile deformation, the tensile region first electrode 32 also undergoes tensile deformation.

  The piezoelectric film 40 is formed on the upper side surface of the compression region first electrode 31 and the upper side surface of the tensile region first electrode 32. That is, the piezoelectric film 40 is disposed along one side surface of the substrate 20 with the first electrode 30 interposed therebetween, and the first electrode 30 is in contact with the first side surface of the piezoelectric film 40. The piezoelectric film 40 has a compression region A that compresses and deforms together with the compressive deformation of the base material 20, and a tensile region B that tensilely deforms together with the tensile deformation of the base material 20. When the piezoelectric film 40 is compressed and deformed in the compression region A to produce a piezoelectric effect, the piezoelectric film 40 is positively charged on the first side surface side and on the second side surface (the upper side surface of the piezoelectric film 40 in FIG. 1; the same applies hereinafter) side. Negative charge collects. On the other hand, when the piezoelectric film 40 is pulled and deformed in the tensile region B to generate a piezoelectric effect, negative charges are collected on the first side surface and positive charges are collected on the second side surface. Since the piezoelectric film 40 is an insulator, the charges do not move between the compression region A and the tension region B in the piezoelectric film 40, and the charges generated by the piezoelectric effect do not cancel each other. .

  The second electrode 50 is divided at the boundary between the compression region A and the tensile region B of the piezoelectric film 40, and the second electrode 51 for the compression region that extends into the compression region A on the piezoelectric film 40 and the piezoelectric film 40. It has the 2nd electrode 52 for tension fields extended to the tension field above. These second electrodes 50 are located outside the edge of the piezoelectric film 40, and lead-out portions 51A, 52A having conductivity such as copper connected to conductive wires 73, 74 connected to rectifier circuits 61, 62 described later, and The conductive film includes conductive contact portions 51B and 52B formed of a conductive resin or the like in contact with the second side surface opposite to the first side surface of the piezoelectric film 40.

  The power generation device includes a first rectifier circuit 61, a second rectifier circuit 62, and a synchronization circuit 63. The first rectifier circuit 61 is connected to the extraction portion 31A of the compression region first electrode 31 provided in the compression region A and the extraction portion 51A of the compression region second electrode 51 by conducting wires 71 and 73, respectively. ing. The second rectifier circuit 62 is connected to the take-out portion 32A of the first pull region electrode 32A and the take-out portion 52A of the second pull region electrode 52 by conducting wires 72 and 74, respectively. ing. The input part of the synchronizing circuit 63 is connected to the output parts of the first rectifier circuit 61 and the second rectifier circuit 62 by conducting wires 75 and 76.

  In the power generation apparatus having such a configuration, when the base material 20 receives an external force, when the compressive deformation and the tensile deformation are generated on one side surface, the piezoelectric film 40 is also deformed along with the deformation to generate a piezoelectric effect. Then, as shown in FIG. 2, an output waveform of output 1-1 is obtained from the first electrode 31 for compressed region and the second electrode 51 for compressed region. Further, an output waveform of output 2-1 is obtained from the first electrode 32 for tensile region and the second electrode 52 for tensile region. The output waveform of the output 1-1 and the output waveform of the output 2-1 have a time delay ΔT and have a substantially opposite phase relationship.

  When the output 1-1 is rectified by the first rectifier circuit 61 and the output 2-1 is rectified by the second rectifier circuit 62, the first rectifier circuit 61 and the second rectifier circuit 62 respectively output the output 1-2 and the output. An output waveform of 2-2 is obtained. The output waveform of the output 1-2 and the output waveform of the output 2-2 have a time delay ΔT, and convert the negative half wave into a positive half wave.

  The synchronization circuit 63 adds the output 1-2 output from the first rectifier circuit 61 and the output 2-2 output from the second rectifier circuit 62 in synchronization. Then, this power generator can obtain an output 3 having a large output value. As described above, in the power generation device, the first electrode 30 and the second electrode 50 are divided at the boundary between the compression region A and the tensile region B, and therefore, the power generation device is generated in the compression region A due to the piezoelectric effect of the piezoelectric film 40. A large generated power can be obtained by outputting electric power having different polarities from each region and combining them by rectification or the like without canceling out the electric charge and the electric charge generated in the tensile region B.

<Example 2>
As shown in FIG. 3, the power generation device of Example 2 is different from Example 1 in the form of the piezoelectric film 140 of the elastic body 110. Other configurations are the same as those of the first embodiment, and the same configurations are denoted by the same reference numerals and detailed description thereof is omitted.

  In this power generation device, the piezoelectric film 140 of the elastic body 110 is divided at the boundary between the compression region A and the tensile region B, like the first electrode 30 and the second electrode 50. For this reason, this elastic body 110 creates a laminated body in which the first electrode 30, the piezoelectric film 140, and the second electrode 50 are laminated in this order, and this laminated body is subjected to tensile deformation and a portion of the base material 20 that undergoes compression deformation. It cuts according to the shape of the part to perform, and can stick and form on the base material 20.

  As with the power generation apparatus of the first embodiment, the power generation apparatus having such a configuration also obtains output 1-1, output 2-1, output 1-2, output 2-2, and output 3, as shown in FIG. be able to. As described above, since the first electrode 30, the piezoelectric film 140, and the second electrode 50 are divided at the boundary between the compression region A and the tensile region B, the power generation device is configured to have the piezoelectric effect of the piezoelectric film 140. Electric power generated in the compression region A and electric charge generated in the tensile region B do not cancel each other, and power having different polarities is output from each region and synthesized by rectification or the like to obtain large power generation. it can.

<Example 3>
As shown in FIG. 4, the power generation device of the third embodiment includes an elastic body 210 having a base material 20, a first electrode 230, piezoelectric films 240 </ b> A and 240 </ b> B, and a second electrode 250, and a rectifier circuit 260. Yes. The base material 20 is made of glass, resin, metal, or the like, and those used as building materials can be applied. This base material 20 has elasticity, and is subjected to an external force, whereby one side surface (the upper side surface of the base material 20 in FIG. 4) is compressed and the deformation direction is concave, and the tensile force is deformation. Deformation occurs. FIG. 4 schematically shows the elastic body 210. For this reason, although the state which compressive deformation arises in the both sides of the tensile deformation in the base material 20 is shown, the case where compressive deformation and tensile deformation occur in several places is considered similarly.

  The first electrode 230 is located outside the edges of the piezoelectric films 240A and 240B, and has a conductive extraction portion 231 made of copper or the like to which a conducting wire 271 connected to a rectifier circuit 260 described later is connected, and the piezoelectric film 240A. , 240B having a conductive contact portion 232 formed of a conductive resin or the like that is in contact with the entire surface of the first side surface on the substrate 20 side in FIG. 4 (the lower side surfaces of the piezoelectric films 240A and 240B in FIG. 4). Have. When the base material 20 receives an external force and undergoes compressive deformation and tensile deformation, the first electrode 230 also undergoes compressive deformation and tensile deformation.

  The piezoelectric films 240 </ b> A and 240 </ b> B are formed on the upper side surface of the first electrode 230. That is, the piezoelectric films 240A and 240B are disposed along one side surface of the substrate 20, and the first electrode 230 is in contact with the first side surface of the piezoelectric films 240A and 240B. The piezoelectric film 40 has a compression region A that compresses and deforms together with the compressive deformation of the base material 20, and a tensile region B that tensilely deforms together with the tensile deformation of the base material 20. The piezoelectric films 240 </ b> A and 240 </ b> B are compression regions. A and tensile region B have opposite polarities. That is, in the compression region A, when compressive deformation occurs, positive charges are collected on the second side surface (upper side surface of the piezoelectric film 240A in FIG. 4; the same applies hereinafter) of the piezoelectric film 240A, and negative charges are collected on the first side surface side. A piezoelectric film 240A having such a polarity is disposed. On the other hand, in the tensile region B, when tensile deformation occurs, positive charges are collected on the second side surface (upper side surface of the piezoelectric film 240B in FIG. 4; the same applies hereinafter) of the piezoelectric film 240B, and negative charges are collected on the first side surface side. A piezoelectric film 240B having such a polarity is disposed. For this reason, when compressive deformation and tensile deformation occur on one side due to the external force of the base material 20, the piezoelectric films 240 </ b> A and 240 </ b> B are also deformed together with the deformation to generate a piezoelectric effect, and the power generating films 240 </ b> A and 240 </ b> B In all regions, positive charges are collected on the second side surface, and negative charges are collected on the first side surface. That is, in the piezoelectric films 240 </ b> A and 240 </ b> B, electric charges do not cancel each other between the compression region A and the tensile region B.

  The second electrode 250 is located outside the edges of the piezoelectric films 240A and 240B, and has a conductive extraction part 251 made of copper or the like to which a conducting wire 272 connected to a rectifier circuit 260 described later is connected, and the piezoelectric film 240A. , 240B having a conductive contact portion 252 formed from a conductive resin or the like that is in contact with the entire surface of the second side surface on the base material 20 side of 240B.

  The rectifier circuit 260 has an input portion connected to the extraction portion 231 of the first electrode 230 and the extraction portion 251 of the second electrode 250 by conducting wires 271 and 272, respectively. The rectifier circuit 260 rectifies the output waveforms extracted from the extraction unit 231 of the first electrode 230 and the extraction unit 251 of the second electrode 250 and outputs an output 3 from the output unit. That is, the rectifier circuit 260 converts the negative half wave into a positive half wave.

  In the power generation device having such a configuration, when compressive deformation and tensile deformation occur on one side surface when the base material 20 receives an external force, the piezoelectric films 240A and 240B are also deformed together with the deformation to generate a piezoelectric effect. In this case, the power generation device can make the charges generated on the same side surface in the compression region A and the tension region B have the same polarity. For this reason, since this electric power generating apparatus can output the synthetic | combination electric power, without the electric charge which generate | occur | produces in the compression area | region A and the tension | pulling area | region B mutually canceling, it can obtain big electric power generation.

  Next, a method for manufacturing the elastic body 10 will be described.

  First, as shown in FIG. 5, a step of forming the first electrode 230 on the substrate 20 is executed. In this step, the take-out portion 231 of the first electrode 230 having a rectangular parallelepiped shape that is long in the lateral direction is bonded onto the substrate 20. And the nozzle N is moved along the direction where this extraction part 231 is extended, and the conductive resin R is apply | coated on the base material 20. FIG. As a result, the first flat plate-like first material having a thickness substantially equal to the thickness of the take-out portion 231 on the base material 20 and a length substantially equal to the lateral length of the take-out portion 231 is spread on the base material 20. A contact portion 232 of the electrode 230 is formed.

  Next, as shown in FIG. 6, while the external electric field is reversed between the compression region A and the tension region B, the piezoelectric film-generating paint P is applied on the first electrode 230, and the compression region A and the tension region B The first step of forming piezoelectric films 240A and 240B having opposite polarities on the first electrode 230 is performed. When the first step is performed, the first electrode 230 is grounded, but may not be grounded.

  In the first step, when the piezoelectric film forming paint P is applied to the compression region A, the voltage control device C connected to the nozzle N is controlled so that the nozzle N has a negative charge. As a result, when the piezoelectric film generating paint P is applied to the compression region A, an electric field from the nozzle N toward the first electrode 230 is generated. When the piezoelectric film 240A formed by applying the piezoelectric film generating paint P in this atmosphere is compressed and deformed, positive charges are collected on the second side surface and negative charges are collected on the first side surface of the piezoelectric film 240A. It has a certain polarity.

  On the other hand, when applying the piezoelectric film forming paint R to the tension region B, the voltage control device C connected to the nozzle N is controlled so that the nozzle N has a positive charge. As a result, when the piezoelectric film forming paint R is applied to the tension region B, an electric field from the first electrode 230 direction to the nozzle N direction is generated. When the piezoelectric film 240B formed by applying the piezoelectric film-generating paint P in this atmosphere is pulled and deformed, positive charges are collected on the second side surface of the piezoelectric film 240B and negative charges are collected on the first side surface. It has a certain polarity.

  Next, as shown in FIG. 7, a second step of forming the second electrode 250 on the piezoelectric films 240A and 240B is performed. In the second step, the nozzle N is moved along the piezoelectric films 240A and 240B, and the conductive resin R is applied onto the piezoelectric films 240A and 240B. Thus, the contact portion 252 of the second electrode 250 is formed over the entire area on the piezoelectric films 240A and 240B. Then, an extraction portion 2B51 of the second electrode 250 having a rectangular parallelepiped shape that is long in the lateral direction is formed outside the edge portion of the piezoelectric films 240A and 240B at the end portion of the contact portion 252 of the second electrode 250. Thus, the elastic body 210 having the piezoelectric films 240A and 240B having opposite polarities in the compression region A and the tensile region B can be manufactured.

<Example 4>
The power generator of Example 4 is provided with the support part 81 which supports the edge part of the elastic body 80, as shown in FIGS. In FIG. 8, the support portion 81 includes a frame 81A and an elastic member 81B interposed between the frame 81A and the elastic body 80. The elastic body 80 is supported by the frame 81A at both end edges via the elastic body 81B, and has a pressure P (for example, wind direction) directed from the upper side to the lower side toward one side surface (the upper surface of the elastic body 10 in FIG. 8). When an external force due to the above is applied), on the upper surface (loading surface) of the elastic body 80, the central portion becomes a compression region A in which compression deformation is performed, and both end portions (outer portions) become tensile regions B in which tensile deformation occurs. Further, on the lower surface of the elastic body 80, the central portion becomes a tensile region B where tensile deformation is performed, and both end portions (outer portions) thereof become compression regions A where compression deformation is performed. Thus, when the support part 81 is provided in the both-ends edge part of the elastic body 80, the compression area | region A and the tension | tensile_strength area | region B will divide | segment into the center part of the elastic body 80, and its outer part.

  FIG. 9 shows the deformation of the elastic body 90 when the elastic body 90 is a rectangular flat plate and an external force is applied from one side as shown in FIG. These are calculated | required by the analysis, and in order to simplify an analysis, the elastic body 90 is made into the pin support by an out-of-plane direction restraint. For this reason, the shape of a compression area | region and a tension | tensile_strength area changes a little with support conditions.

  When the support portion 91 is provided on the entire periphery of the edge portion of the elastic body 90, the loading surface side where the positive pressure is generated is arranged in the center of the elastic body 90 in the form of a rhombus as shown in FIG. The region X1 is cut into a region X1 and a triangular region Y1 at each corner portion around the region X1. The region X1 is a compression region that undergoes compressive deformation, and the region Y1 is a tensile region that undergoes tensile deformation. When the support portions 92 are provided on the two long sides of the elastic body 90, the loading surface side on which positive pressure is generated has a vertically long oval shape at the center of the elastic body 90 as shown in FIG. The region X2 is divided into a region X2 having a shape obtained by cutting the upper and lower sides thereof and a region Y2 of the outer portion around the region, the region X2 is a compression region where compression deformation is performed, and the region Y2 is a tension region where tensile deformation is performed. When the support portions 93 are provided at the four corners of the elastic body 90, the loading surface side on which the positive pressure is generated has a vertically long elliptical top and bottom and left and right cut at the center as shown in FIG. 9C. The region X3 is divided into a shape region X3 and a region Y3 on the left and right outer portions thereof, the region X3 is a compression region that undergoes compression deformation, and the region Y3 is a tensile region that undergoes tensile deformation.

  FIG. 10 shows the deformation of the elastic body 100 when an external force is applied from one side as shown in FIG. 8 as the elastic body 100 is a square flat plate. These are calculated | required by the analysis, and in order to simplify an analysis, the elastic body 100 is made into the pin support by an out-of-plane direction restraint. For this reason, the shape of a compression area | region and a tension | tensile_strength area changes a little with support conditions.

  When the support portion 101 is provided on the entire peripheral edge portion of the elastic body 100, the loading surface side where the positive pressure is generated has a rhombus in the center portion of the elastic body 100 as shown in FIG. The cut region X1 is divided into triangular regions Y1 at the corners around the cut region X1, and the region X1 is a compression region that undergoes compression deformation, and the region Y1 is a tensile region that undergoes tensile deformation. When the support portions 102 are provided on the two sides at the parallel position of the elastic body 100, the loading surface side where the positive pressure is generated is a corner portion at the center of the elastic body 100 as shown in FIG. Is divided into a region X2 having a shape obtained by cutting the top and bottom of a rounded rectangle (rounded rectangle) and a region Y2 of the outer portion around the rectangle, and the region X2 is a compression region that undergoes compression deformation, and the region Y2 undergoes tensile deformation. It is a tensile region. When the support portions 103 are provided at the four corners of the elastic body 100, the loading surface side where the positive pressure is generated is an area having a shape in which the upper and lower sides and the left and right sides are cut into a circular shape at the center as shown in FIG. It is divided into X3 and a region Y3 of the outer portion around it, the region X3 is a compression region that undergoes compression deformation, and the region Y3 is a tensile region that undergoes tensile deformation.

  As described above, when the first electrode, the second electrode, or the piezoelectric film as described above is formed in each of the regions divided into the central portion and the outer portion of the elastic bodies 80, 90, and 100, they are generated in the compression region. The generated charge and the charge generated in the tensile region can be output effectively, and a large power generation can be obtained.

The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In Examples 1 to 3, the first electrode is provided on the base material, but when the base material is made of a metal such as aluminum and is a conductor, the first electrode is not provided, and the conductive wire is connected to the base material. Power may be obtained. That is, when the base material is an insulator, the first electrode can be provided, and when the base material is a conductor, the base material can be used as the first electrode. Further, even when the base material is a conductor, a first electrode insulated from the base material may be provided.
(2) In Examples 1 to 3, a piezoelectric film or the like is provided on one side surface of the base material, but a piezoelectric film or the like may be provided on both surfaces of the base material.
(3) As shown in Example 3, the piezoelectric film may be formed by applying a piezoelectric film-forming coating material, or a film-like film may be attached. In the case where a piezoelectric film is formed by applying a piezoelectric film forming paint, the degree of freedom of the shape of the piezoelectric film is expanded.
(4) In Example 4, although the compression area | region and the tension | pulling area | region were divided | segmented into 2-5, you may divide | segment more finely.
(5) In Examples 1 to 3, the take-out portions of the first electrode and the second electrode are positioned outside the edge of the piezoelectric film. However, the take-out portion is positioned at the center depending on the shape of the elastic body. In some cases, the take-out portion does not have to be positioned outside the edge portion.

  The present invention can be used as an auxiliary power or a security sensor by being applied to a building shell such as a sash.

10, 80, 90, 100, 110, 210 ... elastic body 20 ... base material 30, 230 ... first electrode 40, 140, 240A, 240B ... piezoelectric film 50, 250 ... second electrode 81, 91, 92, 93 , 101, 102, 103 ... support part A ... compression area B ... tension area

Claims (6)

A base material having elasticity in which compression deformation and tensile deformation occur on one side surface by receiving an external force;
A piezoelectric film that is arranged along the one side surface of the base material, and that produces a piezoelectric effect in a compression region that compresses and deforms along with the deformation of the base material and a tensile region that undergoes tensile deformation,
A first electrode in contact with the first side surface of the piezoelectric film on the substrate side;
An elastic body having a second electrode in contact with a second side surface opposite to the first side surface of the piezoelectric film;
A power generation apparatus that outputs combined electric power without causing a charge generated in the compression region and a charge generated in the tension region to cancel each other due to the piezoelectric effect of the power generation film.   The power generator according to claim 1, wherein the elastic body has the first electrode and the second electrode divided at a boundary between the compression region and the tension region.   The power generator according to claim 1, wherein the elastic body has the first electrode, the piezoelectric film, and the second electrode divided at a boundary between the compression region and the tension region.   The power generator according to claim 1, wherein the elastic body has opposite polarities of the piezoelectric film in the compression region and the tension region.   A support portion that supports an edge of the elastic body is provided, wherein one of a central portion and an outer portion of the elastic body is the compression region, and the other is divided into the tension region. The power generation device according to any one of 1 to 4. While the external electric field is reversed between the compression region and the tension region, a piezoelectric film forming paint is applied on the first electrode, and the piezoelectric film having the opposite polarity in the compression region and the tension region is formed. A first step of forming on the first electrode;
The method for producing an elastic body according to claim 4, further comprising a second step of forming the second electrode on the piezoelectric film.

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