JP2008113517A - Power plant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reliable power plant. <P>SOLUTION: The power plant is equipped with a fixed board 1 which has a plurality of electret electrodes 2 on its surface, a movable electrode 5 which has a counter electrode 6 provided to face, at a specified interval d; the electret electrode 2 installed on its surface; a movable part 4 which is provided to move on the fixed board 1 and to move in synchronism with the movable board 5, when the counter electrode 6 moves in an X direction (direction shown by an arrow 10a), while keeping the specified interval d; and a magnet part 3 which is embedded in the fixed board 1 and is provided so that attractive force acts between itself and the movable part 4. Here, the movable part 4 is so arranged as to return to its original position (specified position 8) receiving the attractive force acting between itself and the magnet part 3, even if the movable part 4 moves from the specified position 8 on the fixed board 1 by receiving external force. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power generation device, and more particularly to an electrostatic induction power generation device using an electret material made of a charge retention material.

  Conventionally, by applying a charge to the electrode of the variable capacitance, by causing the Coulomb attractive force to work between the counter electrodes by the charge, by converting the vibration energy generated by the vibration of the vibrator against this Coulomb attractive force into electrical energy, A small electrostatic induction power generation device that generates power is known (for example, see Patent Document 1).

FIG. 11 is a schematic cross-sectional view of a conventional electrostatic induction power generator disclosed in Patent Document 1. In FIG. In a conventional electrostatic induction power generation device (electret power generation device), a second substrate 405 having a plurality of electret material regions 409 and a first substrate 407 having a plurality of conductive surface regions 411 are mutually predetermined. Are arranged at intervals. The second substrate 405 including the electret material region 409 is fixed, and the first substrate 407 including the conductive surface region 411 is connected to the fixing structure 417 via the spring 419. The spring 419 is connected to both side surfaces of the first substrate 407, and the first substrate 407 can move in the X direction (the direction indicated by the arrow 421) by the spring 419, and can return to the home position. When the first substrate 407 vibrates in the X direction, the area where the electret material region 409 holding a charge and the conductive surface region 411 opposed to the first substrate 407 overlap with each other is increased or decreased. A change in charge occurs in the surface region 411. Electric power can be generated by taking out this change in electric charge.
JP 2005-529574 A

  However, in the conventional electrostatic induction power generating device, when the first substrate 407 vibrates, the elastic deformation due to the expansion and contraction of the spring 419 is repeated, which causes a disadvantage that the spring 419 is fatigued and damaged. As a result, there is a problem that the reliability of the electrostatic induction power generating device is lowered.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a highly reliable power generator.

  In order to solve the above-described problems, a power generation device according to the present invention includes a film that holds electric charge, an electrode that is provided to face the film that holds electric charge with a predetermined gap, and a fixed structure. A movable portion provided so as to move in conjunction with the electrode or the film for holding the charge when the electrode or the film for holding the charge moves in a predetermined direction, and a fixed structure. And a magnet portion that is fixed at a predetermined position and provided so that an attractive force acts between the movable portion and the movable portion.

  According to the present invention, the movement of the electrode or the film holding the charge (especially the movement for returning the electrode or the film holding the charge to a predetermined position) is interlocked with the electrode or the film holding the charge as in the prior art. Not due to elastic deformation (expansion / contraction) of the spring, but due to the attractive force acting on the movable part that moves in conjunction with the electrode or the film holding the electric charge, deformation fatigue deterioration due to repeated expansion and contraction of the conventional spring Can be suppressed. Therefore, the reliability of the power generation device can be improved.

  In the above configuration, the movable part is composed of a spherical or cylindrical bearing arranged so as to rotate and move in a predetermined direction, and the tip of the magnet part has a cone or wedge shape toward the movable part. It is preferable. By doing in this way, magnetic force is focused on the front-end | tip part of a magnet part, and attractive force comes to act strongly between a movable part. For this reason, when attracting the movable part which moved with the external force from the predetermined position on the basis of the tip part of the magnet part, the movable part can be accurately returned to the predetermined position without deviation.

  In the above configuration, the movable portion may be formed of a spherical bearing and may be rotated and moved in an arbitrary direction on the fixed structure. In this case, the electrode or the film holding the charge can be oscillated in all directions in conjunction with the movable part. For this reason, it is possible to improve the power generation efficiency as compared with the conventional case where power generation is performed by restricting vibration in one direction by a spring.

  In the above configuration, a position control unit is further provided that is connected to the magnet unit and can move in a direction penetrating the front and back surfaces of the fixed structure. By doing in this way, the space | interval of a movable part and a magnet part can be controlled easily, and the attractive force which acts between a movable part and a magnet part can be adjusted. For this reason, it is possible to easily control the ease of movement (vibration) of the movable part (the electrode that moves in conjunction with the movable part or the film that holds electric charges). Therefore, it is not necessary to manufacture the spring constant of the spring according to the magnitude and cycle of the external force (vibration), so high-performance power generation with a wider application range (power generation possible range) for external force (vibration) than in the past. It can be a device.

  According to the present invention, a highly reliable power generator is provided.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the drawings. In all the drawings, the same reference numerals are given to the same components, and the description will be omitted as appropriate.
(First embodiment)
FIG. 1 is a schematic top view showing the configuration of the power generator according to the first embodiment of the present invention. 2 is a schematic cross-sectional view of the power generation device of FIG. 1 along the line XX, and FIG. 3 is a schematic overhead view showing the positional relationship between the movable portion and the magnet portion in the power generation device of FIG.

  The power generation device according to the first embodiment of the present invention has a fixed substrate 1 having a plurality of electret electrodes 2 on the surface, and a counter electrode 6 provided to face the electret electrodes 2 with a predetermined distance d on the surface. The movable substrate 5 and the fixed substrate 1 are provided so as to be movable. When the counter electrode 6 moves in the X direction (the direction indicated by the arrow 10a) while maintaining a predetermined distance d, The movable part 4 provided so as to move in conjunction with the magnet part 3 embedded and fixed at a predetermined position in the fixed substrate 1 and provided with an attractive force between the movable part 4 and the movable part 4. And.

  Specifically, the fixed substrate 1 includes a plurality of electret electrodes 2 provided on the surface, and a magnet portion 3 embedded with the tip portion exposed on the surface. On the fixed substrate 1, as shown in FIGS. 1 and 2, a structure 1a is provided along the periphery thereof. In a region surrounded by the structure 1 a, the movable substrate 5 is disposed on the fixed substrate 1 via the movable portion 4.

The electret electrode 2 includes a fixed electrode and an electret film that is a charge holding material made of a resin material such as fluorocarbon formed on the surface of the fixed electrode. The electret electrode 2 is provided on the surface of the fixed substrate 1, and the fixed substrate 1 including the electret electrode 2 is fixed in the power generator. As shown in FIG. 1, the shape of the electret electrode 2 is provided by being subdivided in a comb shape in a direction orthogonal to the X direction (direction shown by the arrow 10a), and one end of the electret electrode 2 is a common wiring on the fixed substrate 1 Connected with.

  The magnet portion 3 is made of, for example, a permanent magnet, and has a wedge shape in which the tip 3a gradually narrows toward the movable portion 4 on which the movable substrate 5 is mounted, as shown in FIGS. It has become. The magnet portion 3 is embedded such that the tip portion (the most advanced portion) of the tip portion 3a is exposed on the surface of the fixed substrate 1 at a predetermined position, and the magnetic force is focused by the tip portion 3a (particularly, the most tip portion). Is done. For this reason, an attractive force easily acts between the movable part 4.

  The movable portion 4 is formed of a cylindrical bearing including a material (for example, a metal such as iron, cobalt, nickel, a magnetic material such as iron oxide, chromium iron oxide, and barium ferrite, a magnet) that is attracted by the magnetic force of the magnet portion 3. As shown in FIGS. 1 and 2, they are arranged so as to move while rotating in the X direction (the direction indicated by the arrow 10a). The movable portion 4 is provided at two positions on both ends of the movable substrate 5, and each of the movable portions 4 is in a predetermined position on the fixed substrate 1 without receiving external force (specifically, the magnet portion 3 exposed on the surface of the fixed substrate 1. 8 just above the front end portion 3a). The entire movable substrate 5 is supported by the movable part 4 arranged in this way. As shown in FIGS. 2 and 3, the movable portion 4 is disposed immediately above the tip portion 3 a (particularly the most advanced portion) of the magnet portion 3, and has a very small area (substantially a straight line) between them. Interact. As a result, the attracting force of the magnet part 3 acts most strongly between the two, so that even if the movable part 4 receives an external force and moves from a predetermined position 8 on the fixed substrate 1, The movable part 4 returns to the original position (predetermined position 8) due to the attractive force acting during the period.

  The movable substrate 5 includes a counter electrode 6 provided on the surface (lower surface side), and a semi-cylindrical groove provided on the surface at a position corresponding to the movable portion 4 (a concave portion corresponding to the shape of the movable portion 4). 7). The movable substrate 5 is mounted on the fixed substrate 1 (the tip portion 3a of the magnet portion 3) by fitting the movable portion 4 formed of a cylindrical bearing into the groove 7. As a result, the movable substrate 5 (movable substrate 5 including the counter electrode 6) moves in conjunction with the movable portion 4.

  The counter electrode 6 is provided on the surface (lower surface side) of the movable substrate 5 and is disposed so as to face the electret electrode 2 with a predetermined distance d. The shape of the counter electrode 6 is the same as that of the electret electrode 2, and is provided by being subdivided into a comb shape in a direction orthogonal to the X direction (direction indicated by the arrow 10 a), and one end thereof is common on the movable substrate 5. Connected by wiring.

  In the power generation device configured as described above, when the external force is applied and the movable substrate 5 vibrates, the area where the two overlap each other between the electret electrode 2 holding the electric charge and the counter electrode 6 opposed thereto is increased or decreased. As a result, a charge change occurs in the counter electrode 6. Electric power can be generated by taking out this change in electric charge. In addition, the electret electrode 2 is the “film for holding electric charge” of the present invention, the counter electrode 6 is the “electrode” of the present invention, the fixed substrate 1 is the “fixed structure” of the present invention, and the magnet part 3 is the “magnet” of the present invention. The “part” and the movable part 4 are examples of the “movable part” in the present invention.

  Next, the vibration operation of the movable substrate 5 (counter electrode 6) with respect to the fixed substrate 1 (electret electrode 2) in the power generation device of the present invention will be described.

  FIG. 4 is a schematic cross-sectional view for explaining the vibration operation of the power generator according to the first embodiment of the present invention. 4A shows the positional relationship between the magnet part 3 and the movable part 4 in a state in which no external force is received, and FIG. 4B shows the magnet part 3 in a state in which the movable part 4 has been moved by receiving the external force. And the positional relationship between the movable part 4 are shown.

  As shown in FIG. 4A, in a state where no external force is received (initial state), the movable portion 4 is at a predetermined position 8 immediately above the tip portion 3a (particularly the most advanced portion) of the magnet portion 3, and the movable portion 4 and the magnet portion 3 are in contact with each other and interact in a minute area region (substantially a straight line). In such a positional relationship, the force acting upward of the magnet unit 3 and the force acting downward of the movable unit 4 are balanced, and the arrangement of the movable unit 4 is stable. The movable substrate 5 is mounted on the fixed substrate 1 in a state corresponding to the movable portion 4, and is movable in the X direction (direction indicated by the arrow 10a) in synchronization with the movable portion 4.

  On the other hand, as shown in FIG. 4B, in the state where the movable part 4 is moved to the position 8a by receiving an external force (movement amount L1), the force acting upward of the magnet part 3 does not change, but it is movable. The force acting downward of the portion 4 changes to an oblique force acting toward the tip 3a (particularly the most advanced portion) of the magnet portion 3. Since such a force in the oblique direction rotates the movable portion 4, the movable portion 4 moves (movement amount L2) toward the distal end portion 3a (particularly the most advanced portion) of the magnet portion 3, and returns to the original position (predetermined). Will return to position 8). The same applies when moving in the opposite direction. Since the movable substrate 5 operates in synchronism with such reciprocating motion of the movable portion 4, it vibrates with good reproducibility and accuracy.

  FIG. 5 is a schematic cross-sectional view for explaining the vibration operation of the power generation device in which the shape of the tip of the magnet portion is changed. FIG. 5A shows the positional relationship between the magnet portion 3 having a wide tip and the movable portion 4 when no external force is received, and FIGS. 5B and 5C are movable by receiving the external force. FIG. 5 (D) shows the positional relationship between the magnet part 3 and the movable part 4 in a state where the part 4 has moved, and FIG. 5 (D) shows the magnet part in a state where the movable part 4 has moved by the attractive force from the state of FIG. 5 (C). 3 shows the positional relationship between 3 and the movable part 4.

  As shown in FIG. 5A, in a state where no external force is received (initial state), the movable portion 4 is in a predetermined position 8 on the tip portion (wide and flat tip portion) 3a1 of the magnet portion 3. . In such a positional relationship, the force acting upward of the magnet unit 3 and the force acting downward of the movable unit 4 are balanced, and the arrangement of the movable unit 4 is stable.

  On the other hand, for example, as shown in FIG. 5B, when the movable part 4 moves to the position 8a (movement amount L1) in response to an external force, the movable part 4 is on the tip 3a1 of the magnet part 3. Exists. At the position 8 a, a balance is established between the force acting upward of the magnet part 3 and the force acting downward of the movable part 4, and the arrangement of the movable part 4 is stable. For this reason, even if the movable part 4 receives the external force and moves to the position 8a, an attractive force for returning to the original position (predetermined position 8) does not act. Therefore, in such movement within the range of the width of the distal end portion 3a1, power is generated only by movement in one direction (movement amount L1) when an external force is applied, and power generation efficiency is reduced.

  Further, as shown in FIG. 5C, when the movable part 4 moves to the position 8b (movement amount L3), the movable part 4 moves to a position away from the tip 3a1 of the magnet part 3. As a result, the downward force acting on the movable portion 4 changes to an oblique force acting toward the tip portion 3a1 of the magnet portion 3. Although such an oblique force acts to move the movable part 4 toward the tip part 3a1 of the magnet part 3, as shown in FIG. 5D, the position of the magnet part 3 on the tip part 3a1 By moving to 8c (movement amount L4), the force acting upward of the magnet unit 3 and the force acting downward of the movable unit 4 are balanced, and the arrangement of the movable unit 4 becomes stable. For this reason, in such movement, power is generated by movement (movement amount L3) when receiving external force and movement (movement amount L4) when returning due to the attractive force, and a difference in movement amount (L3-L4). Only the power generation efficiency decreases.

Further, at the position 8c as shown in FIG. 5D, when the rightward movement (the direction away from the magnet portion 3) is caused by an external force, the movable portion 4 returns to the original position (position 8c) by the attractive force. Therefore, the power generation efficiency does not decrease. In addition, in the leftward movement by an external force, the power generation efficiency is reduced as described above.

  As described above, in the case where the tip portion of the magnet portion 3 is a wide and flat tip portion 3a1, the power generation efficiency may be reduced due to the width, so the shape of the tip portion of the magnet portion is movable. It is preferable that the point of action of the attractive force with the part interact with each other in a minute area region (substantially a point or a straight line).

According to the power generator according to the first embodiment of the present invention described above, the following effects can be obtained.
(1) The movement of the movable substrate 5 including the counter electrode 6 (the movement for returning the movable portion 4 operating in conjunction with the movable substrate 5 including the counter electrode 6 to the predetermined position 8) is performed as in the conventional case. This is not performed by elastic deformation (expansion / contraction) of the spring interlocked with the movable substrate 5 including 6, but by the attractive force acting on the movable portion 4 operating in conjunction with the movable substrate 5 including the counter electrode 6. Deformation fatigue deterioration due to repetition of the expansion and contraction operation of the spring can be suppressed. Therefore, the reliability of the power generation device can be improved.
(2) A cylindrical bearing arranged to rotate and move the movable portion 4 in a predetermined direction 10a is adopted, and the tip portion 3a of the magnet portion 3 faces the movable portion 4 so as to have a wedge shape. As a result, the magnetic force is focused on the tip 3 a of the magnet unit 3, and the attractive force acts strongly with the movable unit 4. For this reason, when attracting the movable part 4 moved by the external force from the predetermined position 8 with respect to the tip part 3a of the magnet part 3, the movable part 4 can be accurately returned to the predetermined position 8 without deviation.
(Second Embodiment)
FIG. 6 is a schematic top view showing the configuration of the power generator according to the second embodiment of the present invention. 7 is a schematic cross-sectional view taken along line XX of the power generation device of FIG. 6, FIG. 8 is a schematic cross-sectional view taken along line YY of the power generation device of FIG. 6, and FIG. It is a schematic overhead view which shows the positional relationship of the movable part and magnet part in an electric power generating apparatus. The difference from the first embodiment is that the movable substrate 5 including the counter electrode 6 can be moved in any direction when the counter electrode 6a is moved relative to the electret electrode 2a in the horizontal direction. . The rest is the same as in the first embodiment.

  Specifically, as shown in FIG. 6, the shapes of the electret electrode 2a and the counter electrode 6a alternate between the X direction (the direction indicated by the arrow 10a) and the Y direction perpendicular to the X direction (the direction indicated by the arrow 10b). It is bent to The movement of the counter electrode 6a in an arbitrary direction is performed by combining the movement in the X direction and the movement in the Y direction. At this time, the amount of change in the facing area with the electret electrode 2a when the counter electrode 6a is moved a predetermined distance only in the X direction (the direction indicated by the arrow 10a) is the Y direction (indicated by the arrow 10b). It is the same as the amount of change in the facing area when the same distance is moved only in (direction). In addition, the electret electrode 2a and the counter electrode 6a are arrange | positioned so that it may oppose with the predetermined space | interval d, as shown in FIG.

  As shown in FIG. 7 and FIG. 9, the magnet portion 13 has a conical shape in which the tip end portion 13 a is gradually narrowed toward the movable portion 14 on which the movable substrate 5 is mounted. The magnet portion 13 is embedded so that the tip portion (the most advanced portion) of the tip portion 13 a is exposed on the surface of the fixed substrate 1.

As shown in FIGS. 7 and 9, the movable portion 14 is composed of a spherical bearing, and is disposed immediately above the tip portion 13 a of the magnet portion 13 so as to be able to move on the fixed substrate 1 while rotating in an arbitrary direction. ing. Further, as shown in FIG. 6, the movable portion 14 is provided at four locations near the corner portion of the movable substrate 5, and each of the movable portions 14 is in a predetermined position on the fixed substrate 1 (specifically, not receiving external force). 18 directly above the tip portion 13 a of the magnet portion 13 exposed on the surface of the fixed substrate 1. The entire movable substrate 5 is supported by the movable portion 14 arranged in this manner.

  With such a configuration of the magnet portion 13 and the movable portion 14, even when the movable portion 14 receives an external force and moves in a given direction from the predetermined position 18 on the fixed substrate 1, it acts between the magnet portion 13. Due to the attractive force, the movable portion 14 returns to the original position (predetermined position 18).

According to the electric power generating apparatus which concerns on 2nd Embodiment of this invention, in addition to the effect of said (1), the following effects can be acquired now.
(3) By adopting a spherical bearing as the movable portion 14 so as to be able to rotate and move in any direction on the fixed substrate 1, the movable substrate 5 vibrates in all directions in conjunction with the movable portion 14. Will be able to. For this reason, it is possible to improve the power generation efficiency as compared with the conventional case where power generation is performed by restricting vibration in one direction by a spring.
(4) It is possible to generate power equally by moving the same distance with respect to the vibration in the X direction (the direction indicated by the arrow 10a) and the vibration in the Y direction (the direction indicated by the arrow 10b) perpendicular to the X direction. Compared to the case where power generation is performed with the amount of change in one direction biased in one direction, power generation can be performed more efficiently with respect to vibrations in all directions.
(Third embodiment)
FIG. 10 is a schematic top view showing the configuration of the power generator according to the third embodiment of the present invention. The difference from the second embodiment is that the magnet unit 23 is connected to the position control unit 25 in the groove 24 formed from the back side of the fixed substrate 1, and the position control unit 25 connects the magnet unit 23 and the movable unit 14. The interval between them can be adjusted. Note that the tip portion 23 a of the magnet portion 23 is not exposed on the surface side of the fixed substrate 1. In addition, for example, a position adjusting screw is adopted as the position control unit 25, and the position of the magnet unit 23 is moved by moving the position adjusting screw up and down (in a direction penetrating the front and back of the fixed substrate 1) in the groove 24. It can be adjusted. The rest is the same as in the second embodiment.

According to the power generator according to the third embodiment of the present invention, in addition to the effects (1), (3), and (4), the following effects can be obtained.
(5) By providing the position control unit 25 that is connected to the magnet unit 23 and can move in a direction penetrating the front and back in the fixed substrate 1, the interval between the movable unit 14 and the magnet unit 23 can be easily set. It is possible to control the attractive force acting between the magnet part 23 and the movable part 14. For this reason, it is possible to easily control the ease of movement (vibration) of the movable portion 14 (the movable substrate 5 that moves in conjunction with the movable portion 14). Therefore, it is not necessary to manufacture the spring constant of the spring according to the magnitude and cycle of the external force (vibration), so high-performance power generation with a wider application range (power generation possible range) for external force (vibration) than in the past. It can be a device.

  The present invention is not limited to the above-described embodiments, and various modifications such as design changes can be added based on the knowledge of those skilled in the art. Embodiments to which such modifications are added are also possible. It can be included in the scope of the present invention. For example, you may combine the structure of each embodiment suitably.

  In the first embodiment, an example in which a cylindrical bearing is employed as the movable portion 4 has been shown. For example, a spherical bearing as in the second embodiment is disposed on the tip portion 3a of the magnet portion 3, The movement may be limited only in the X direction. Moreover, the magnet part 13 and the movable part 14 as shown in FIG. 9 may be arranged, and the movement of them may be restricted only in the X direction. In this case, the same effect as that of the first embodiment can be obtained.

In the first and second embodiments, the tip portions 3a and 13a of the magnet portions 3 and 13 are provided so as to be exposed on the surface of the fixed substrate 1. However, for example, with respect to the movable portions 4 and 14, If the attractive force acts, it may be completely embedded in the fixed substrate 1.

  In the said 2nd Embodiment, although the example which provided the magnet part 13 and the movable part 14 on the fixed board | substrate 1 was shown, this invention is not limited to this, For example, they are provided in three places or five places or more. It may be possible to move in any direction. In this case, the same effect can be enjoyed.

  In the above embodiment, the example in which the electret electrode 2 (2a) is provided on the surface of the fixed substrate 1 and the counter electrode 6 (6a) is provided on the surface of the movable substrate 5 has been shown, but the present invention is not limited to this. Alternatively, the arrangement of both electrodes may be switched, the electret electrode 2 (2a) may be provided on the surface of the movable substrate 5, and the counter electrode 6 (6a) may be provided on the surface of the fixed substrate 1. In this case, the same effect can be enjoyed.

The schematic top view which shows the structure of the electric power generating apparatus which concerns on 1st Embodiment of this invention. The schematic sectional drawing in alignment with the XX line of the electric power generating apparatus of FIG. The schematic overhead view which shows the positional relationship of the movable part and magnet part in the electric power generating apparatus of FIG. (A), (B) The schematic sectional drawing for demonstrating the vibration operation | movement of the electric power generating apparatus which concerns on 1st Embodiment of this invention. (A)-(D) The schematic sectional drawing for demonstrating the vibration operation | movement of the electric power generating apparatus which changed the shape of the front-end | tip part of a magnet part. The schematic top view which shows the structure of the electric power generating apparatus which concerns on 2nd Embodiment of this invention. The schematic sectional drawing in alignment with the XX line of the electric power generating apparatus of FIG. The schematic sectional drawing along the YY line of the electric power generating apparatus of FIG. The schematic overhead view which shows the positional relationship of the movable part and magnet part in the electric power generating apparatus of FIG. The schematic top view which shows the structure of the electric power generating apparatus which concerns on 3rd Embodiment of this invention. The schematic sectional drawing which shows the structure of the conventional electrostatic induction type generator.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Fixed substrate (fixed structure), 2 ... Electret electrode, 3 ... Magnet part, 3a ... Tip part of a magnet part, 4 ... Movable part, 5 ... Movable board, 6 ... counter electrode, 10a ... vibration in X direction.

Claims (4)

A membrane that retains charge,
An electrode provided so as to face the film holding the electric charge with a predetermined interval;
Provided to move on the fixed structure, and to move in conjunction with the electrode or the film holding electric charge when the electrode or the film holding electric charge moves in a predetermined direction. Moving parts,
A magnet portion fixed at a predetermined position of the fixed structure and provided so that an attractive force acts between the movable portion;
A power generation device. The movable part consists of a spherical or cylindrical bearing arranged to rotate and move in the predetermined direction,
The power generator according to claim 1, wherein a tip of the magnet portion has a cone shape or a wedge shape toward the movable portion.   The power generation device according to claim 1, wherein the movable portion is formed of a spherical bearing and is configured to be able to rotate and move in an arbitrary direction on the fixed structure.   The position control part which is provided in connection with the magnet part and can move in a direction penetrating the front and back in the fixed structure is further provided. Power generator.

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