Power generation device

Abstract

The present invention provides a power generation device that utilizes the piezoelectric effect and has an electrical connection structure that is less susceptible to vibrations during power generation. [Solution] The power generation device 10 comprises a plate-shaped substrate 11, a first piezoelectric layer 121 and a second piezoelectric layer 122 provided adjacent to the substrate 11, a first electrode 131 and a second electrode 132 provided on the surface of the first piezoelectric layer 121, a third electrode 133 and a fourth electrode 134 provided on the surface of the second piezoelectric layer 122, a first terminal 141 and a second terminal 142, a second wiring 152 connecting the second electrode 132 and the first terminal 141, a fourth wiring 154 connecting the fourth electrode 134 and the second terminal 142, and a second through-wiring 164, and an external force causes deformation of the piezoelectric layer to generate a potential difference between the first terminal and the second terminal.

Description

Technical Field

[0001] The present invention relates to a power generation device.

Background Art

[0002] Conventionally, power generation devices that utilize the piezoelectric effect to convert energy such as wind energy, hydraulic energy, wave energy, and vibration energy into electrical energy are known. For example, Patent Document 1 discloses an electrical connection structure of a power generation device that converts wind energy into electrical energy.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the above electrical connection structure is based on wiring using cables or the like, and there is a risk that the wiring may vibrate due to the influence of vibration during power generation of the power generation device. An object of the present invention is to provide a power generation device that utilizes the piezoelectric effect, has an electrical connection structure that is less affected by vibration during power generation, and can enhance the reliability of the electrical connection structure.

Means for Solving the Problems

[0005] The present invention is a power generation device comprising a plate-shaped substrate, one or more piezoelectric layers provided adjacent to the substrate, a plurality of electrodes provided at opposing positions on the surface of the piezoelectric layers, a plurality of terminals, and a plurality of conductive means for conducting electricity between the electrodes and the terminals, wherein at least one of the conductive means comprises through wiring that penetrates at least one of the members constituting the substrate and the piezoelectric layer, and a potential difference is generated between the terminals by deformation of the piezoelectric layer due to an external force. [Effects of the Invention]

[0006] According to an aspect of the present invention, it is possible to provide a power generation device that utilizes the piezoelectric effect, has an electrical connection structure that is less susceptible to vibrations during power generation, and can improve the reliability of the electrical connection structure. [Brief explanation of the drawing]

[0007] [Figure 1] This is a perspective view showing the overall structure of the power generation device according to the first embodiment. [Figure 2] This is a plan view showing the overall structure of the power generation device according to the first embodiment. [Figure 3] This is a side view showing the overall structure of the power generation device according to the first embodiment. [Figure 4] This is a cross-sectional view showing the internal structure of the power generation device according to the first embodiment. [Figure 5] This is a perspective view showing the overall structure of a power generation module in which power generation devices of the first embodiment are arranged. [Figure 6] This is a perspective view showing the overall structure of the power generation device according to the second embodiment. [Figure 7] This is a side view showing the overall structure of the power generation device according to the second embodiment. [Figure 8] This is a cross-sectional view showing the internal structure of the power generation device according to the second embodiment. [Modes for carrying out the invention]

[0008] [First Embodiment] The power generation device of the first embodiment of the present invention will be described below with reference to Figures 1 to 4. This embodiment describes a configuration in which the power generation device has one piezoelectric layer on each side of the substrate.

[0009] Figure 1 is a perspective view showing the overall structure of the power generation device 10. Figure 2 is a plan view showing the overall structure of the power generation device 10, and Figure 3 is a side view showing the overall structure of the power generation device 10 as seen in the opposite direction to the first direction L in Figure 1. As shown in Figures 1 to 3, the power generation device 10 comprises a base material 11, which includes a vibrating part 111 and a fixed part 112. The normal direction of the surface having the largest area of ​​the vibrating part 111 is a first direction L, and the normal direction of the surface having the largest area of ​​the fixed part 112 is a second direction M that intersects the first direction L.

[0010] The base material 11 is a plate-shaped member made of resin materials such as polycarbonate and polyethylene terephthalate, metal materials such as stainless steel, aluminum alloys, titanium alloys, and nickel alloys, or composite materials such as fiber-reinforced resins. If the base material 11 includes a component made of a conductive material, the base material 11 may have a first insulating layer (not shown) on the surface of the component made of a resin material such as epoxy, polyimide, or polyetheretherketone (PEEK), or a ceramic material such as alumina or zirconia.

[0011] The difference in the normal direction of the surface having the largest area between the vibrating part 111 and the fixed part 112 (the first direction L and the second direction M, respectively) may be formed by methods such as bending the flat plate-shaped base material 11.

[0012] The fixing portion 112 may be provided with through holes 18 or the like for fixing the power generation device 10 to other members with bolts or the like.

[0013] Figure 4 is a cross-sectional view showing the internal structure of the power generation device 10. Figure 4(a) is a cross-sectional view at cross-section AA in Figures 2 and 3, and Figure 4(b) is a cross-sectional view at cross-section BB in Figures 2 and 3. As shown in Figure 4, a first electrode 131 is provided on at least a portion of one side of the vibrating portion 111. A first piezoelectric layer 121 is provided on at least a portion of the side of the first electrode 131 opposite to the side where the vibrating portion 111 is located. Furthermore, a second electrode 132 is provided on at least a portion of the side of the first piezoelectric layer 121 opposite to the side where the first electrode 131 is located, at a position facing the first electrode 131 across the first piezoelectric layer 121. A third electrode 133 is provided on at least a portion of the surface of the vibrating part 111 opposite to the surface where the first electrode 131 is located. A second piezoelectric layer 122 is provided on at least a portion of the surface of the third electrode 133 opposite to the surface where the vibrating part 111 is located. Furthermore, a fourth electrode 134 is provided on at least a portion of the surface of the second piezoelectric layer 122 opposite to the surface where the third electrode 133 is located, at a position facing the third electrode 133 across the second piezoelectric layer 122.

[0014] The first piezoelectric layer 121 and the second piezoelectric layer 122 are made of piezoelectric resin materials such as polyvinylidene fluoride (PVDF), polylactic acid (PLA), and porous polypropylene, or piezoelectric ceramic materials such as lead zirconate titanate (PZT) and barium titanate (BaTiO3). The first piezoelectric layer 121 and the second piezoelectric layer 122 may be made using members molded into a sheet shape, or they may be formed by depositing the material onto the surfaces of the first electrode 131 and the third electrode 133 by aerosol deposition (AD) or chemical solution deposition (CSD) method.

[0015] The first electrode 131, the second electrode 132, the third electrode 133, and the fourth electrode 134 are made of a material containing a conductive material such as copper, silver, nickel, gold, or carbon. These electrodes may be formed by applying a paste containing the conductive material, or may be formed by ejecting an ink containing the conductive material by an inkjet method. Further, these electrodes may be formed by forming a film of the conductive material by vapor deposition, sputtering, or the like.

[0016] As shown in (a) of FIG. 4, a first terminal 141 is provided on one surface of the fixing portion 112. The second electrode 132 and the first terminal 141 are electrically connected by a second wiring 152. The second wiring 152 that electrically connects the second electrode 132 and the first terminal 141 corresponds to the first conduction means.

[0017] As shown in (b) of FIG. 4, a second terminal 142 is provided on the same side surface as the surface on which the first terminal 141 of the fixing portion 112 is located. The fourth electrode 134 and the second terminal 142 are electrically connected by a fourth wiring 154 and a second through-wiring 164. In the figure, the second through-wiring 164 is provided at one location, but the second through-wiring 164 may be provided at a plurality of locations. The fourth wiring 154 and the second through-wiring 164 that electrically connect the fourth electrode 134 and the second terminal 142 correspond to the second conduction means.

[0018] The first electrode 131 and the third electrode 133 are electrically connected by a first through-wiring 161 that penetrates the base material 11. The first through-wiring 161 is provided at a position sandwiched between the first piezoelectric layer 121 and the second piezoelectric layer 122. The first through-wiring 161 that electrically connects the first electrode 131 and the third electrode 133 corresponds to the third conduction means.

[0019] As shown in FIG. 3, the first through-wiring 161 is provided at two locations on cross-section A-A and cross-section B-B, but the first through-wiring 161 may be provided at one location, or may be provided at three or more locations. Further, the location of the first through-wiring 161 may not be on cross-section A-A or cross-section B-B. If the base material 11 has the first insulating layer on its surface, the first through-wiring 161 may penetrate only the first insulating layer.

[0020] The first terminal 141 and the second terminal 142 are connected to a rectifier circuit (not shown) or the like.

[0021] The first terminal 141, the second terminal 142, the second wiring 152, and the fourth wiring 154 are made of a material containing a conductive material such as copper, silver, nickel, gold, or carbon. These terminals and wiring may be formed by applying a paste containing the conductive material, or by ejecting an ink containing the conductive material using an inkjet method. Alternatively, these terminals and wiring may be formed by depositing the conductive material as a film by vapor deposition or sputtering.

[0022] The first through-hole wiring 161 and the second through-hole wiring 164 are made of a material containing a conductive material such as copper, silver, nickel, gold, or carbon. These through-hole wirings may be formed by applying a paste containing the conductive material to through-holes provided in the base material 11, or by ejecting an ink containing the conductive material into through-holes provided in the base material 11 using an inkjet method.

[0023] The power generation mechanism of power generation device 10 will be explained. The side of the power generation device 10 with the fixed part 112 is fixed, and the side with the vibrating part 111 is placed in a location where it is exposed to wind in the atmosphere, water currents in the water, or waves on the water surface. As a result, the external force acting on the side with the vibrating part 111 of the power generation device 10 fluctuates due to changes in the flow velocity of fluids such as air and water, and flutter phenomena and Karman vortices associated with the movement of fluids such as air and water, causing the side with the vibrating part 111 to vibrate.

[0024] As shown in Figure 4(a), when the shape of the vibrating part 111 of the power generation device 10 changes from state P to state Q due to the above vibration, the stress in direction R in the first piezoelectric layer 121 changes from compressive stress to tensile stress, and the piezoelectric effect of the first piezoelectric layer 121 generates a potential difference between the first electrode 131 and the second electrode 132. This generates a potential difference between the first terminal 141 and the first through-wiring 161. Furthermore, as shown in Figure 4(b), when the shape of the vibrating part 111 of the power generation device 10 changes from state P to state Q due to the vibration, the stress in direction R in the second piezoelectric layer 122 changes from tensile stress to compressive stress, and the piezoelectric effect of the second piezoelectric layer 122 generates a potential difference between the third electrode 133 and the fourth electrode 134. This generates a potential difference between the first through-wiring 161 and the second terminal 142.

[0025] This generates a large potential difference between the first terminal 141 and the second terminal 142, which is the sum of the potential difference between the first terminal 141 and the first through-wiring 161 due to the piezoelectric effect of the first piezoelectric layer 121 and the potential difference between the first through-wiring 161 and the second terminal 142 due to the piezoelectric effect of the second piezoelectric layer 122. This allows power to be supplied to external equipment through rectifier circuits and the like connected to the first terminal 141 and the second terminal 142.

[0026] The power generation device 10 has a second conductive means comprising a second through-wiring 164, and a third conductive means comprising a first through-wiring 161. By having a portion of the wiring pass through the inside of the power generation device 10, the electrical connection structure can be made less susceptible to vibrations during power generation, thereby increasing the reliability of the electrical connection structure of the power generation device.

[0027] If at least one of the first through-wiring 161 and the second through-wiring 164 is provided in multiple locations, the function of the power generation device 10 can be maintained even if one through-wiring is damaged due to stress fluctuations or the like, further enhancing the reliability of the electrical connection structure of the power generation device.

[0028] The power generation device 10 has the first terminal 141 and the second terminal 142 on the same side of the fixed portion 112. This simplifies the electrical connection structure and further enhances the reliability of the power generation device's electrical connection structure.

[0029] An example of the structure when multiple power generation devices 10 are arranged to form a power generation module will be explained with reference to Figure 5. Figure 5 is a perspective view showing the overall structure of the power generation module 30. The power generation module 30 comprises multiple power generation devices 10 attached to a single base 41. The power generation devices 10 are fixed to the base 41 by bolts 48, through holes 18, and screw holes (not shown) provided in the base 41. As a result, the first terminal 141 and the second terminal 142 are electrically connected to contacts (not shown) provided on the base 41 that are electrically connected to a terminal group 43. The terminal group 43 may be connected to a rectifier circuit or the like.

[0030] [Second Embodiment] Hereinafter, a power generation device according to a second embodiment of the present invention will be described with reference to Figures 6 to 8. However, components having the same configuration as those in the first embodiment will be denoted by the same reference numerals and their descriptions will be omitted as appropriate. This embodiment describes a configuration in which the power generation device has multiple piezoelectric layers on both sides of the substrate.

[0031] Figure 6 is a perspective view showing the overall structure of the power generation device 20. Figure 7 is a side view showing the overall structure of the power generation device 20 as seen in the opposite direction to the first direction L in Figure 6. Figure 8 is a cross-sectional view showing the internal structure of the power generation device 20, where Figure 8(a) is a cross-sectional view at cross-section CC in Figure 7, and Figure 8(b) is a cross-sectional view at cross-section DD in Figure 7.

[0032] As shown in Figure 8, a plurality of first piezoelectric layers 221 are provided adjacent to one side of the vibrating portion 111. In addition, a first electrode 231 is provided in at least a portion of the region between the vibrating portion 111 and the first piezoelectric layers 221. In at least a portion of the region between the plurality of adjacent first piezoelectric layers 221, and in at least a portion of the outermost surface of the outermost first piezoelectric layer 221 as viewed from the vibrating portion 111, second electrodes 232 and first electrodes 231 are alternately provided in order of proximity to the vibrating portion 111, with the first electrode 231 and the second electrode 232 facing each other across the first piezoelectric layer 221. Multiple second piezoelectric layers 222 are provided at positions adjacent to the surface opposite to the surface adjacent to the first piezoelectric layer 221 of the vibrating part 111. A third electrode 233 is provided in at least a portion of the region between the vibrating part 111 and the second piezoelectric layer 222. Fourth electrodes 234 and third electrodes 233 are alternately provided in order of proximity to the vibrating part 111 in at least a portion of the region between multiple adjacent second piezoelectric layers 222, and in at least a portion of the outermost surface of the outermost second piezoelectric layer 222 as viewed from the vibrating part 111, with the third electrode 233 and fourth electrode 234 facing each other across the second piezoelectric layer 222.

[0033] As shown in Figure 8(a), a first terminal 141 is provided on one side of the fixed portion 112. The second electrode 232 and the first terminal 141 are electrically connected by a second wiring 252. Furthermore, if there are multiple second electrodes 232, a fourth through-wiring 262 is provided that penetrates the first piezoelectric layer 221 and provides electrical connection between the multiple second electrodes 232. The fourth through-wiring 262 may provide electrical connection from the outermost second electrode 232 as viewed from the base material 11 to the innermost second electrode 232 as viewed from the base material 11. The second wiring 252 and the fourth through-wiring 262, which connect the second electrode 232 and the first terminal 141, correspond to the first conductive means.

[0034] As shown in Figure 8(b), a second terminal 142 is provided on the same side of the fixed portion 112 as the side where the first terminal 141 is located. The fourth electrode 234 and the second terminal 142 are electrically connected by the fourth wiring 254 and the second through wiring 164. Furthermore, if there are multiple fourth electrodes 234, a sixth through wiring 264 is provided that penetrates the second piezoelectric layer 222 and provides electrical connection between the multiple fourth electrodes 234. The sixth through wiring 264 may provide electrical connection from the outermost fourth electrode 234 as viewed from the base material 11 to the innermost fourth electrode 234 as viewed from the base material 11. The fourth wiring 254, the second through-wiring 164, and the sixth through-wiring 264, which provide electrical conductivity between the fourth electrode 234 and the second terminal 142, correspond to the second conductive means.

[0035] The first electrode 231 and the third electrode 233 are electrically connected by a first through-wiring 161 that penetrates the base material 11. When there are multiple first electrodes 231, a third through-wiring 261 is provided that penetrates the first piezoelectric layer 221 and conducts electricity between the multiple first electrodes 231. The third through-wiring 261 may conduct electricity from the outermost first electrode 231 as viewed from the base material 11 to the innermost first electrode 231 as viewed from the base material 11. The third through-wiring 261 may also be provided continuously with the first through-wiring 161. Furthermore, if there are multiple third electrodes 233, a fifth through-wiring 263 is provided that penetrates the second piezoelectric layer 222 and provides electrical conductivity between the multiple third electrodes 233. The fifth through-wiring 263 may provide electrical conductivity from the outermost third electrode 233 as viewed from the base material 11 to the innermost third electrode 233 as viewed from the base material 11. Also, the fifth through-wiring 263 may be provided in continuity with the first through-wiring 161. The first through-wiring 161, the third through-wiring 261, and the fifth through-wiring 263, which provide electrical conductivity between the first electrode 231 and the third electrode 233, correspond to the third conductive means.

[0036] As shown in Figure 7, the third through-wiring 261, the fourth through-wiring 262, the fifth through-wiring 263, and the sixth through-wiring 264 are each provided in two locations on cross section CC and cross section DD. However, the third through-wiring 261, the fourth through-wiring 262, the fifth through-wiring 263, and the sixth through-wiring 264 may each be provided in one location or in three or more locations. Furthermore, the positions of the third through-wiring 261, the fourth through-wiring 262, the fifth through-wiring 263, and the sixth through-wiring 264 do not have to be on cross section CC or cross section DD.

[0037] As shown in Figure 8, when the third through-wiring 261, fourth through-wiring 262, fifth through-wiring 263, and sixth through-wiring 264 each penetrate multiple members of the first piezoelectric layer 221 or the second piezoelectric layer 222, the position of the through-wiring penetrating one such member and the position of the through-wiring penetrating an adjacent member may be offset in the planar direction of the base material 11. When the first through-wiring 161 and the second through-wiring 164 each penetrate a base material 11 made up of multiple members, the position of the through-wiring penetrating one of the members and the position of the through-wiring penetrating an adjacent member may be offset in the planar direction of the base material 11.

[0038] The power generation mechanism of the power generation device 20 will be explained. The side of the power generation device 20 with the fixed part 112 is fixed, and the side with the vibrating part 111 is placed in a location where it is exposed to wind in the atmosphere, water currents in the water, or waves on the water surface. As a result, the external force acting on the side with the vibrating part 111 of the power generation device 20 fluctuates due to changes in the flow velocity of fluids such as air and water, and flutter phenomena and Karman vortices associated with the movement of fluids such as air and water, causing the side with the vibrating part 111 to vibrate.

[0039] As shown in Figure 8(a), when the shape of the vibrating portion 111 side of the power generation device 20 changes from state P to state Q due to the above vibration, the stress in direction R in the first piezoelectric layer 221 changes from compressive stress to tensile stress, and the piezoelectric effect of the first piezoelectric layer 221 generates a potential difference between the second electrode 232 and the first electrode 231. This generates a potential difference between the first terminal 141 and the first through-wiring 161. Furthermore, as shown in Figure 8(b), when the shape of the vibrating portion 111 of the power generation device 20 changes from state P to state Q due to the vibration, the stress in direction R in the second piezoelectric layer 222 changes from tensile stress to compressive stress, and the piezoelectric effect of the second piezoelectric layer 222 generates a potential difference between the third electrode 233 and the fourth electrode 234. This generates a potential difference between the first through-wiring 161 and the second terminal 142.

[0040] This generates a large potential difference between the first terminal 141 and the second terminal 142, which is the sum of the potential difference between the first terminal 141 and the first through-wiring 161 due to the piezoelectric effect of the first piezoelectric layer 221 and the potential difference between the first through-wiring 161 and the second terminal 142 due to the piezoelectric effect of the second piezoelectric layer 222. This allows power to be supplied to external equipment through the rectifier circuit and the like connected to the first terminal 141 and the second terminal 142.

[0041] The power generation device 20 has a first conductive means comprising a fourth through-wiring 262, a second conductive means comprising a second through-wiring 164 and a sixth through-wiring 264, and a third conductive means comprising a first through-wiring 161, a third through-wiring 261, and a fifth through-wiring 263. By having a portion of the wiring pass through the inside of the power generation device 20, the electrical connection structure can be made less susceptible to vibrations during power generation, thereby increasing the reliability of the electrical connection structure of the power generation device.

[0042] If at least one of the third through-wiring 261, fourth through-wiring 262, fifth through-wiring 263, and sixth through-wiring 264 is provided in multiple locations, the function of the power generation device 20 can be maintained even if one through-wiring is damaged due to stress fluctuations or the like, further enhancing the reliability of the electrical connection structure of the power generation device.

[0043] If at least one of the first through-wirings 161, second through-wiring 164, third through-wiring 261, fourth through-wiring 262, fifth through-wiring 263, and sixth through-wiring 264 has a position where the through-wiring penetrates at least one of the members constituting the base material 11, the first piezoelectric layer 221, the second piezoelectric layer 222, etc., and the through-wiring penetrates an adjacent member are offset in the planar direction of the base material 11, the area of ​​the electrode exposed inside the through-hole can be increased, and the reliability of the electrical connection structure of the power generation device can be further improved.

[0044] [Variation] The power generation device 10 includes a first through-wiring 161 and a second through-wiring 164, but the power generation device 10 may include at least one of the first through-wiring 161 and the second through-wiring 164. The power generation device 20 includes a first through-wiring 161, a second through-wiring 164, a third through-wiring 261, a fourth through-wiring 262, a fifth through-wiring 263, and a sixth through-wiring 264. However, the power generation device 20 may also include at least one of the first through-wiring 161, the second through-wiring 164, the third through-wiring 261, the fourth through-wiring 262, the fifth through-wiring 263, and the sixth through-wiring 264.

[0045] The power generation device 10 includes a total of three conductive means, namely the first conductive means, the second conductive means, and the third conductive means, but the number of conductive means may be two or four or more. The same applies to the power generation device 20.

[0046] The power generation device 10 is provided with a plurality of electrodes on both sides of the vibrating portion 111, each positioned opposite the piezoelectric layer and the surface of the piezoelectric layer. However, the power generation device 10 may be provided with a plurality of electrodes on only one side of the vibrating portion 111, each positioned opposite the piezoelectric layer and the surface of the piezoelectric layer. Specifically, it may be provided with a first piezoelectric layer 121, a first electrode 131, and a second electrode 132, but may not be provided with a second piezoelectric layer 122, a third electrode 133, and a fourth electrode 134. In this case, the second electrode 132 and the first terminal 141 may be electrically connected by a fourth conductive means, and the first electrode 131 and the second terminal 142 may be electrically connected by a fifth conductive means. At least one of the fourth conductive means and the fifth conductive means includes through wiring that penetrates at least one of the members constituting the base material 11 and the first piezoelectric layer 121. The same applies to the power generation device 20.

[0047] In the power generation device 10, the first through-wiring 161 is provided in a position sandwiched between the first piezoelectric layer 121 and the second piezoelectric layer 122. However, the first through-wiring 161 may also be provided outside the region of the vibrating part 111 sandwiched between the first piezoelectric layer 121 and the second piezoelectric layer 122, or on the fixed part 112. If the first through-wiring 161 is provided in the fixed part 112, the fixed part 112 may be provided with a terminal that is electrically connected to the first through-wiring 161, and together with the first terminal 141 and the second terminal 142, it may be connectable to an external device. The same applies to the power generation device 20.

[0048] The first terminal 141 and the second terminal 142 are formed on the side of the fixing portion 112 opposite to the second direction M, but at least one of the first terminal 141 and the second terminal 142 may be formed on the side of the fixing portion 112 that is on the same side as the second direction M.

[0049] The power generation device 10 includes a first electrode 131 and a third electrode 133. However, if the base material 11 includes a component made of a conductive material, the component made of the conductive material constituting the base material 11 may also serve the roles of the first electrode 131 and the third electrode 133. In this case, the device does not need to include the first electrode 131 and the third electrode 133. The same applies to the power generation device 20.

[0050] The configuration of electrodes, terminals, wiring, through-wiring, and conductive means may differ from the configuration of power generation device 10, power generation device 20, and the modified examples described above. The wiring and through-wiring may connect different electrodes and different terminals, and the conductive means may correspond to different wiring or different through-wiring.

[0051] The base material 11 may be made up of multiple components of the same material, or multiple components of different materials laminated together. Furthermore, the type of material and the number of materials laminated may differ between the vibrating part 111 and the fixing part 112 of the base material 11. Furthermore, the type of material being laminated and the number of laminated materials may change within the vibrating section 111 or the fixed section 112.

[0052] The first direction L and the second direction M intersect, but they may also be parallel. Furthermore, the angle between the first direction L and the second direction M may be acute, right, or obtuse.

[0053] The vibrating part 111 is flat, but it may also be curved. In this case, the first direction L is the normal direction to any position on the surface of the vibrating part 111 that has the largest surface area. Furthermore, although the fixing portion 112 is flat, it may also be curved. In this case, the second direction M is the normal direction to any position on the surface of the fixing portion 112 that has the largest area.

[0054] The present invention is not limited to the first and second embodiments and the above-described variations, and various modifications are possible. [Explanation of symbols]

[0055] 10 Power generation devices 11 Base material 111 Vibration section 112 Fixed part 121 First piezoelectric layer 122 Second piezoelectric layer 131 First electrode 132 Second electrode 133 Third electrode 134 The fourth electrode 141 First terminal 142 Second terminal 152 Second wiring 154 Fourth Wiring 161 First through wiring 164 Second through-wiring

Claims

1. Plate-shaped base material, One or more piezoelectric layers provided at a position adjacent to the substrate, Multiple electrodes are provided at opposing positions on the surface of the piezoelectric layer. Multiple terminals, It comprises a plurality of conductive means for connecting the electrode and the terminal, At least one of the conductive means comprises a through-wiring that penetrates at least one of the members constituting the substrate and the piezoelectric layer. A power generation device that generates a potential difference between terminals by deformation of the piezoelectric layer due to an external force.

2. The piezoelectric layer is One or more first piezoelectric layers adjacent to one surface of the substrate, The substrate includes one or more second piezoelectric layers adjacent to the surface opposite to the surface adjacent to the first piezoelectric layer, The electrode is One or more first electrodes are provided on one surface of each of the first piezoelectric layers. One or more second electrodes are provided on the surface of each of the first piezoelectric layers opposite to the surface on which the first electrode is provided, at least a portion of the position facing the first electrode across the first piezoelectric layer, One or more third electrodes are provided on one side of each of the second piezoelectric layers. Each of the aforementioned second piezoelectric layers includes one or more fourth electrodes, provided on the surface opposite to the surface on which the third electrode is provided, at least a portion of the surface facing the third electrode across the second piezoelectric layer, The terminals include a first terminal and a second terminal, The aforementioned conductive means is A first conductive means for electrically connecting one of the first electrode, the second electrode, the third electrode, and the fourth electrode to the first terminal, A second conductive means for connecting one of the electrodes among the first electrode, second electrode, third electrode, and fourth electrode that does not conduct electricity with the first terminal to the second terminal, The device includes a third conductive means for electrically connecting two electrodes among the first electrode, second electrode, third electrode, and fourth electrode that are not electrically connected to either the first terminal or the second terminal, The power generation device according to claim 1, wherein the through-wiring is provided in at least one of the first conductive means, the second conductive means, and the third conductive means, and penetrates at least one of the members constituting the base material, the first piezoelectric layer, and the second piezoelectric layer.

3. The piezoelectric layer is The substrate comprises one or more of the first piezoelectric layers adjacent to one surface of the substrate, The electrode is One or more of the first electrodes are provided on one surface of each of the first piezoelectric layers. Each of the first piezoelectric layers includes one or more second electrodes, provided on the surface opposite to the surface on which the first electrode is provided, at least a portion of the surface facing the first electrode across the first piezoelectric layer, The terminal includes the first terminal and the second terminal, The aforementioned conductive means is A fourth conductive means for electrically connecting one of the first electrode and the second electrode to the first terminal, The invention includes a fifth conductive means that connects the electrode that is not conductive to the first terminal with the second terminal of the first electrode and the second electrode, The power generation device according to claim 1, wherein the through-wiring is provided in at least one of the fourth conductive means and the fifth conductive means, and penetrates at least one of the members constituting the base material and the first piezoelectric layer.

4. The power generation device according to claim 2, wherein the third conductive means comprises a first through-wiring that penetrates at least one of the members constituting the base material, and the first through-wiring is provided at a position sandwiched between the first piezoelectric layer and the second piezoelectric layer of the base material.

5. The power generation device according to claim 2, wherein the third conductive means comprises a third through-wiring that penetrates multiple layers of the first piezoelectric layer, and the third through-wiring provides conductivity from the outermost first electrode as viewed from the substrate to the innermost first electrode as viewed from the substrate.

6. The power generation device according to claim 5, wherein the third conductive means comprises a fifth through-wiring that penetrates multiple layers of the second piezoelectric layer, and the fifth through-wiring provides conductivity from the outermost third electrode as viewed from the substrate to the innermost third electrode as viewed from the substrate.

7. The power generation device according to claim 2, wherein the first conductive means comprises a fourth through-wiring that penetrates a plurality of first piezoelectric layers, and the fourth through-wiring provides conductivity from the outermost first electrode as viewed from the substrate to the innermost first electrode as viewed from the substrate.

8. The power generation device according to claim 7, wherein the second conductive means comprises a sixth through-wiring that penetrates multiple layers of the second piezoelectric layer, and the sixth through-wiring provides conductivity from the outermost second electrode as viewed from the substrate to the innermost second electrode as viewed from the substrate.

9. The power generation device according to claim 2 or 3, wherein at least one of the first conductive means and the second conductive means comprises a second through-wiring that penetrates at least one of the members constituting the base material.

10. The power generation device according to claim 1, wherein the through-wiring that penetrates at least one of the members constituting the base material and the through-wiring that penetrates the piezoelectric layer are provided in a continuous manner.

11. The power generation device according to claim 1, wherein the through-wiring is provided at multiple locations in at least one of the members constituting the base material and the piezoelectric layer.

12. The power generation device according to claim 1, wherein the position of the through-wiring that penetrates at least one of the members constituting the substrate and the piezoelectric layer, and the position of the through-wiring that penetrates an adjacent member, are offset in the planar direction of the substrate.

13. The power generation device according to claim 1, wherein the substrate comprises a vibrating portion and a fixed portion, the piezoelectric layer is adjacent to the vibrating portion, and the terminals are provided on the fixed portion.

14. The power generation device according to claim 13, wherein the plurality of terminals are provided on the same side surface of the fixed portion.

15. The power generation device according to claim 13, wherein the normal direction of the surface having the largest area of ​​the vibrating portion is a first direction, the normal direction of the surface having the largest area of ​​the fixed portion is a second direction, and the first direction and the second direction intersect.

Images