JP2011078198A - Electrostatic induction generation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrostatic induction generation apparatus which has high power generation efficiency. <P>SOLUTION: The electrostatic induction generation apparatus includes a cylindrical tubular member which has movement regulation parts at both ends thereof and is formed of an insulating material; a cylindrical movable member which is arranged reciprocally inside the tubular member, at least a part of which is formed of a solid metal, and in which a penetration hole extending in the same direction as that of movable member reciprocation is formed; a rod-shaped center metal member which is arranged in parallel with the axial line of the tubular member and penetrates the penetration hole of the movable member; and a cylindrical electrode which is arranged on the internal face or the external face of the tubular member. An electret is formed at a portion of the external periphery of the movable member or a portion of the cylindrical electrode, and the tubular member has a length which allows the surface area of the cylindrical electrode contacting with the electret or a surface area of the movable member to be variable due to the movement of the movable member. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electrostatic induction power generating device using an electret.

  Conventionally, as a power generation device that converts kinetic energy into electric energy, an electrostatic induction power generation device using an electret that has a relatively simple structure and high energy conversion efficiency has been proposed.

  An electrostatic induction conversion element provided with an electret film shown in Patent Document 1 includes a movable electrode, a fixed electrode, and an electret film that is a charge holding material made of a fluorine-based resin material or the like formed on the fixed electrode. It is constituted by. This electrostatic induction conversion element can obtain the kinetic energy of the movable electrode as a voltage change by vibrating the movable electrode to change the amount of charge induced to the movable electrode by the charge charged on the electret film. it can. That is, it is configured to generate electricity by converting kinetic energy into electrical energy. However, since this electrostatic induction conversion element vibrates the movable electrode portion, there is a problem that the reliability of the electrical wiring connected to the movable electrode portion is lowered.

  Therefore, in Patent Document 2 and Patent Document 3, a solid dielectric or fluid provided between an electrode provided with an electret and an opposing electrode is used as a movable object to move between the inter-electrode region and the inter-electrode outer region. By doing so, the capacitance between the electrodes is changed, and the change in the capacitance is output. The fluid proposed in Patent Document 3 is a liquid, a liquid metal, a vapor, a dielectric bead, a metal bead, or a mixture thereof.

JP 2006-180450 A JP 2005-529574 A Special table 2008-507250 gazette

However, the power generation apparatus based on the capacitance change caused by the movement of the solid dielectric or fluid shown in Patent Document 2 and Patent Document 3 has the following problems, is not reliable, and the kinetic energy of the movable object to be obtained Therefore, the change in the electric capacity between the electrodes is difficult to occur, and the power generation efficiency of electric energy is not good.
1. In a fluid consisting of liquid (metal) and vapor, the sealing technique is important because it is liquid or vapor, and the operation reliability when generating vibration is low. Moreover, since the moving speed with which the transmission efficiency of the force from the external vibration is low is low, the obtained kinetic energy is also low. Further, in Patent Document 3, mercury is preferred when using a liquid metal, but mercury is difficult to actually use because there is a concern about adverse effects on the human body.
2. In a fluid composed of a dielectric bead or a metal bead, when the bead group moves, the shape of the fluid changes due to damage caused by mutual contact, and a constant output cannot be obtained in long-term use. In addition, since the bead group fluid is strongly influenced by the earth's gravity when moving, for example, when the moving direction is perpendicular to the gravity, the bead group is filled with high density between the electret and the electrode. It is difficult to repeatedly generate an unsatisfied state, and as a result, a large change in electric capacity cannot be obtained.
3. Solid dielectrics are easily cracked, chipped, etc. due to shocks caused by vibration, and stable output cannot be obtained after long-term use. Moreover, since the mass is generally small, the obtained kinetic energy is low.

  An object of the present invention is to provide an electrostatic induction power generation device that solves the above-described problems and has high reliability and high power generation efficiency.

  In order to achieve the above object, an electrostatic induction power generating device according to claim 1 of the present invention is provided with a tubular tubular member formed of an insulating material and at both ends of the tubular member. A movement restricting portion and a cylindrical movable member provided inside the tubular member so as to be reciprocally movable, and at least a part thereof is made of a solid metal and provided with a through hole extending in the same direction as the reciprocating direction. A movable member, a rod-shaped central metal member that is provided in parallel with the axis of the tubular member, and is inserted through a through-hole of the movable member, and a cylindrical electrode provided in the tubular member, The cylindrical electrode or the movable member, wherein an electret part is formed on either a part of the outer periphery of the movable member or a part of the cylindrical electrode, and faces the electret part by the movement of the movable member The surface area of That the possible length of, wherein said tubular member has.

  Further, in the electrostatic induction power generating device according to the second aspect of the present invention, in addition to the configuration of the first aspect, the movable member and the central metal member are in contact with each other in the through hole. It is characterized by being arranged.

  According to a third aspect of the present invention, in addition to the configuration of the first and second aspects, the movable member includes a solid metal and an insulator in the moving direction. It is configured by being laminated alternately, at least two of which are the solid metal, and the electret part formed in a part of the cylindrical electrode is formed as a place where the electret is formed. None of the portions are alternately formed, and at least two of them are formed with electrets.

  According to a fourth aspect of the present invention, in addition to the configuration of the first and second aspects of the invention, the cylindrical electrode includes a solid metal and an insulator that are movable. It is constituted by being alternately formed in the movement direction of the member, and at least two of them are the solid metal, and the electret part formed on a part of the outer periphery of the movable member is formed with an electret. Locations that are present and locations that are not formed are alternately formed, and at least two of them are formed with electrets.

  According to a fifth aspect of the present invention, in addition to the configuration according to the first to fourth aspects of the present invention, an elastic shock absorber is provided on the inner surface side of the movement restricting portion. Is provided.

  Further, in the electrostatic induction power generating device according to claim 6 of the present invention, in addition to the configuration of the invention according to claims 1 to 5, the tubular member and the movable member have the same cross-sectional shape. It is characterized by.

  According to a seventh aspect of the present invention, in addition to the configuration of the first to sixth aspects, the electrostatic induction power generating device according to the seventh aspect of the present invention has a through-hole through which the central wiring metal is inserted in the movable member. Besides, a through hole extending in a reciprocating direction is provided.

  An electrostatic induction power generating device according to a first aspect of the present invention includes a cylindrical tubular member formed of an insulating material, a movement restricting portion provided at both ends of the tubular member, and reciprocating inside the tubular member. A movable movable member having a cylindrical shape, the movable member having at least a part made of solid metal and provided with a through hole extending in the same direction as the reciprocating direction, and the axis of the tubular member And a cylindrical center metal member inserted through the through hole of the movable member and a cylindrical electrode provided on the tubular member, and a part of the outer periphery of the movable member, or the cylinder The electret part is formed in any part of the electrode, and the surface area of the cylindrical electrode facing the electret part or the movable member can be changed by the movement of the movable member The tubular Wood has. In the present invention, the movable member is a solid metal, and the rod-shaped central metal member is inserted into the through-hole provided in the movable member, so that a high kinetic energy is obtained and the electrostatic induction type is rich in durability. A power generator can be obtained at low cost.

  In addition to the effect of the invention according to claim 1, the electrostatic induction power generating device according to claim 2 is arranged such that the movable member and the central metal member are in contact with each other in the through hole. As a result, the change in the electric capacity between the cylindrical electrode and the central metal member can be further increased, and electric energy can be generated more efficiently.

  According to a third aspect of the present invention, in addition to the effects of the first and second aspects of the invention, the movable member has the solid metal and the insulator alternately stacked in the moving direction. And at least two layers are the solid metal, and the electret part formed in a part of the cylindrical electrode is alternately formed with a place where the electret is formed and a place where the electret is not formed. Since the electret is formed in at least two places among them, a change in electric capacity is simultaneously generated at a plurality of places by a small movement of the movable member, so that power generation efficiency can be improved.

  According to a fourth aspect of the present invention, in addition to the effects of the first and second aspects, the cylindrical electrode includes a solid metal and an insulator in the movement direction of the movable member. It is configured by being alternately formed, at least two of which are the solid metal, and the electret part formed on a part of the outer periphery of the movable member is formed as a place where the electret is formed. The portions that are not formed are alternately formed, and at least two of them are formed with electrets, so that a change in electric capacity occurs simultaneously at a plurality of locations with a small movement of the movable member, so that power generation efficiency can be improved. .

  In addition to the effects of the inventions according to claims 1 to 4, the electrostatic induction power generating device according to the invention according to claim 5 is provided with an elastic buffer on the inner surface side of the movement restricting portion. Thus, it is possible to prevent the solid metal that is the movable member from being damaged.

  According to a sixth aspect of the present invention, in addition to the effects of the first to fifth aspects, the tubular member and the movable member have the same cross-sectional shape. The distance between the cylindrical electrode formed on the movable member and the movable member can be further shortened, and the power generation efficiency can be further increased.

  According to a seventh aspect of the present invention, in addition to the effects of the first to sixth aspects, the movable member is reciprocated in addition to the through-hole through which the central wiring metal is inserted. By providing the through-hole extending in the moving direction, the through-hole through which the central metal member is not inserted becomes a vent and air resistance due to movement can be reduced, so that high kinetic energy can be obtained. As described above, by obtaining high kinetic energy, it is possible to obtain an electrostatic induction power generating apparatus that can obtain electric energy more efficiently.

It is a vertical front view of the electrostatic induction power generating device of the first embodiment. It is arrow direction sectional drawing in the A-A 'line | wire of the electrostatic induction power generating device of 1st Embodiment shown in FIG. It is a vertical front view of the electrostatic induction power generating device of the second embodiment. It is arrow direction sectional drawing in the B-B 'line | wire of the electrostatic induction type electric power generating apparatus of 2nd Embodiment shown in FIG. It is a vertical front view of the electrostatic induction power generating device of 3rd Embodiment. FIG. 6 is a cross-sectional view in the direction of the arrow in the C-C ′ line of the electrostatic induction power generating device of the third embodiment shown in FIG. 5. It is a vertical front view of the electrostatic induction power generating device of 4th Embodiment. It is arrow direction sectional drawing in the D-D 'line | wire of the electrostatic induction power generating device of 4th Embodiment shown in FIG.

<First Embodiment>
Hereinafter, an electrostatic induction power generating device of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal front view of an electrostatic induction power generating device 1 according to a first embodiment. 2 is a cross-sectional view taken along the line AA ′ of the electrostatic induction power generating device of the first embodiment shown in FIG.

  As shown in FIGS. 1 and 2, the electrostatic induction power generation device 1 includes a tubular member 2, a cylindrical electrode 3 provided on the outer surface of the tubular member 2, and an electret portion 7 formed on a part thereof. In the space 2 a inside the tubular member 2, the rod-shaped electrode 5 disposed so as to extend in parallel with the axis of the tubular member 2, and a through-hole through which the rod-shaped electrode 5 is inserted, the top of the rod-shaped electrode 5 is elongated. It is comprised from the movable member 9 which can reciprocate in a direction. The rod-like electrode 5 corresponds to the central metal member of the present invention.

  The tubular member 2 has a cylindrical shape made of an acrylic resin, and a space 2a is provided inside the tubular member 2 with an end portion in the longitudinal direction of the tubular member 2 being opened. The length of the tubular member 2 is such that when the movable member 9 moves in the internal space 2a, the surface area of the movable member 9 facing the cylindrical electrode 3 on which the electret portion 7 is provided changes. Is the length that can be done. Movement restricting portions 12 b and 12 c are attached to the tubular member 2 at open ends 2 b and 2 c in the longitudinal direction of the tubular member 2. The movement restricting portions 12b and 12c are provided so as to block the open end portions 2b and 2c so that the movable member 9 does not come out of the space 2a. In the example of FIGS. 1 and 2, flat members are provided as the movement restricting portions 12b and 12c, and the space 2a is completely sealed. The movement restricting portions 12b and 12c are made of acrylic resin.

  In addition, in this embodiment, although the tubular member 2 was illustrated by the cylindrical shape, it is not limited to this shape, For example, other polygonal cylinder shapes, such as an elliptic cylinder shape and a square cylinder, may be sufficient. Further, the open end portions 2b and 2c are completely sealed by the movement restricting portions 12b and 12c. However, if the movement can be restricted so that the movable member 9 does not come out of the space 2a, it is not always necessary to completely seal, for example, a lattice shape. It may be.

  The rod-like electrode 5 has a cylindrical shape made of low resistance stainless steel, and both ends thereof are fixed to the center points of the movement restricting portions 12b and 12c. The rod-like electrode 5 is connected to a wiring 20 extending outside the tubular member 2 through a hole (not shown) formed in the movement restricting portion 12c. The material of the rod-shaped electrode 5 may be a metal such as Al, Ti, or Cr other than the low resistance stainless steel plate, or may be a material in which the above-described metal thin film is formed on an insulating substrate such as a resin. The shape of the rod-shaped electrode 5 is not limited to a cylindrical shape, and may be an elliptical column shape or a polygonal column shape.

  Buffer bodies 17b and 17c having a substantially cylindrical shape and a hole at the center thereof are bonded to the movement restricting portions 12b and 12c on the inner surfaces of the movement restricting portions 12b and 12c, and the rod-like electrode 5 is inserted into the holes. Is provided. The buffer bodies 17b and 17c are made of an elastic material, and examples of the material include isoprene rubber, nitrile rubber, and butadiene rubber.

  The cylindrical electrode 3 is uniformly formed on the outer periphery near the center of the tubular member 2 and is provided so as to form a cylindrical shape. In this embodiment, the cylindrical electrode 3 is formed of an Al film. The material of the cylindrical electrode 3 may be a material in which a thin metal film such as Ti, Cr, Ni or the like is formed on an insulating base material such as a resin other than an Al film.

  The electret part 7 is uniformly formed on the inner surface side of the cylindrical electrode 3. In this embodiment, the electret part 7 is formed as a film of a fluororesin. This electret portion 7 is formed by applying a fluorine resin film to the low resistance stainless steel forming the cylindrical electrode 3 by dipping and then heat-treating the film, and electrons are applied to the film by corona discharge. Being injected. The electret part 7 is adjusted to a potential of about −100 to −2000V.

  The cylindrical electrode 3 and the electret part 7 are fixed to the outer surface of the tubular member 2 with an insulating tape 13. The insulating tape 13 is provided with a hole (not shown), and the wiring 20 is connected to the cylindrical electrode 3 through the hole.

  The movable member 9 is a cylinder formed of a solid metal made of low resistance stainless steel. The movable member is formed in substantially the same size in the cross-sectional direction with respect to the space 2a in the tubular member 2, and moves freely only in the longitudinal direction of the space 2a.

  In addition, although the shape of the movable member 9 was illustrated by the cylinder, it is not limited to this shape. However, also in this case, it is desirable to have the same cross-sectional shape as the space 2 a inside the tubular member 2.

  A through hole 15 extending in the moving direction is provided on a line connecting the centers of the left and right side surfaces of the movable member 9. The through hole 15 has a circular cross-sectional shape, and the size thereof is substantially the same as that of the rod-shaped electrode 5. The rod-shaped electrode 5 is inserted into the through hole 15 so as to contact the movable member 9.

  The cross-sectional shape of the through hole is not limited to a circular shape, but is preferably the same cross-sectional shape as the rod-shaped electrode 5.

  Next, the operation of the electrostatic induction power generating device 1 of this embodiment will be described. First, the electrostatic induction power generating device 1 of the present embodiment is vibrated in the longitudinal direction of the tubular member 2. The force applied to the electrostatic induction power generation device 1 due to the vibration is transmitted as kinetic energy of the movable member 9. The movable member 9 reciprocates in the longitudinal direction in the space 2a at a speed given by a total force obtained from the applied force and the frictional force between the tubular member 2 and the resistance force from the gas. Enter and leave the space inside the electrode 3. In the space between the cylindrical electrode 3 and the rod-shaped electrode 5, an electric field is formed by charging of the electret part 7. When the movable member 9 enters the electric field and the area of the movable member 9 facing the electret portion 7 increases, the electric capacity between the electrodes increases. Further, when the movable member 9 moves and is extracted from the above-described electric field and the area of the movable member 9 facing the electret portion 7 decreases, the electric capacity between the electrodes decreases. By oscillating the electrostatic induction power generation device 1, the movable member 9 repeatedly enters and exits the space inside the cylindrical electrode 3, thereby forming between the cylindrical electrode 3 and the rod-shaped electrode 5. The electric capacity of the electric field repeatedly increases and decreases, and an alternating current can be obtained. Therefore, electrical energy can be taken out by connecting the cylindrical electrode 3 and the rod-shaped electrode 5 to the external load (wiring 20).

  As described above, the electrostatic induction power generating device 1 according to the present embodiment has a capacity of an electric field generated by moving the movable member 9 to the space between the cylindrical electrode 3 and the electret portion 7 provided on the rod-like electrode 5. Since the change is used for the output of power generation, it is not necessary to connect the wiring to the movable member 9, so that the wiring portion does not move, and thus high reliability is obtained.

  Further, in the electrostatic induction power generating device 1 of the present embodiment, the movable member 9 is formed of a solid metal. Since the external force transmission efficiency is good compared to the fluid, the moving speed is high, and the kinetic energy that is the source of conversion of the obtained electrical energy is high. Further, since the movement of the movable member made of a solid metal is used for the capacity change for power generation, a large change in electric capacity can be obtained as compared with the fluid or the solid dielectric movable member. In addition, since solid metals generally exhibit good ductility and malleability, they are more resistant to cracking and chipping due to vibration impacts and are more durable than solid dielectrics. Furthermore, compared with the case where liquid, liquid metal, or vapor is used for the movable member, an advanced sealing technique is not required, so that the power generation device can be obtained at low cost.

  Furthermore, since the movable member 9 includes the through-hole 15 and the rod-shaped electrode 5 is inserted into the through-hole 15 so that the movement of the movable member 9 within the tubular member 2 can be performed stably, Contact between the movable member 9 and the tubular member 2 is prevented, and it is possible to prevent power generation from becoming impossible or power generation efficiency from being reduced due to damage.

  Further, in the electrostatic induction power generating device 1 of the present embodiment, since the movable member 9 is in contact with the rod-shaped electrode 5, the movable member 9 is at the same potential as the rod-shaped electrode 5. Moreover, since the cross-sectional shape of the movable member 9 is the same as that of the tubular member 2, the movable member 9 can be brought closer to the cylindrical electrode 3 and the electret part 7. The closer the distance between the electret part 7 and the movable member 9, the greater the capacitance between the electrodes. Therefore, when the movable member 9 enters the electric field from the outside of the electric field due to electrification of the electret part 7, the amount of change in the electric capacity between the electrodes can be increased, and the power generation efficiency can be further increased.

  Further, the electrostatic induction power generating device 1 of the present embodiment is provided with elastic buffer bodies 17b and 17c at both ends of the tubular member 2, so that the movable member 9 and the movement restricting portions 12b and 12c Damage due to contact can be prevented.

  The length of the space 2a in the tubular member 2 in the longitudinal direction, particularly the length from the end faces of the buffer bodies 17b and 17c to the end of the cylindrical electrode 3 is set to be the same as or slightly larger than that of the movable member 9. Is preferred. In this case, the amount of change in the electric field in the space between the cylindrical electrode 3 and the rod-shaped electrode 5 is maximized, and power generation can be performed most efficiently.

Second Embodiment
Next, an electrostatic induction power generating device according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a longitudinal sectional view of the electrostatic induction power generating device of the second embodiment. FIG. 4 is a cross-sectional view in the direction of the arrows along the line BB ′ of the electrostatic induction power generating device of the second embodiment shown in FIG.

  As shown in FIGS. 3 to 4, the electrostatic induction power generating device 100 of the second embodiment is provided on the tubular member 2 and the outer surface of the tubular member 2, and an electret part 107 is formed on a part thereof. A cylindrical electrode 3, a rod-shaped electrode 5 disposed in the space 2 a inside the tubular member 2 so as to extend in parallel with the axis of the tubular member 2, and a through-hole through which the rod-shaped electrode 5 is inserted, The movable member 109 is capable of reciprocating in the longitudinal direction on the rod-shaped electrode 5. Compared to the electrostatic induction power generation device 1 of the first embodiment, the configurations of the electret part 107 and the movable member 109 are different. The following description will be made only on points that are different from the first embodiment, and the same points as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

  The electret part 107 is formed on the inner surface side of the cylindrical electrode 3. The electret part 107 is formed by providing three strip-like electrets 117 at intervals in the longitudinal direction of the tubular member 2. Since the material and the forming method are the same as those of the electret portion 7 of the first embodiment, description thereof is omitted.

  The movable member 109 includes a solid metal part 119 having a shape obtained by dividing the movable member 9 of the first embodiment in the moving direction and an insulating part 129 made of an insulator having the same shape and the same size in the moving direction. It is formed by alternately laminating. In this example, the number of stacked layers is three for the solid metal part 119 and two for the insulating part 129, and the total length in the moving direction (longitudinal direction) of the movable member 109 is the same as that of the movable member 9 of the first embodiment. is there. An acrylic resin was used for the insulator 129.

  Further, on the line connecting the centers of the left and right side surfaces of the movable member 109, a through hole 115 extending in the moving direction is provided in the same manner as the through hole 15 of the first embodiment, and the rod-shaped electrode 5 is inserted therethrough. .

  The operation of the electrostatic induction power generating device 100 of this example is the same as that of the first embodiment. However, the solid metal portions 119 and the insulating portions 129 are alternately stacked in the moving direction of the movable member 109, and the electret portion 107 is provided with at least two electrets 117 spaced apart in the longitudinal direction of the tubular member 2. As a result, a plurality of electric fields are formed between the cylindrical electrode 3 and the rod-shaped electrode 5, and a plurality of solid metals can enter and exit there. As a result, a change in electric capacity is simultaneously generated at a plurality of locations with a small movement of the movable member, so that power generation efficiency can be improved. Therefore, unlike the first embodiment, the length from the end face of the buffer bodies 17b and 17c to the end of the cylindrical electrode 3 in the length in the longitudinal direction of the space 2a in the tubular member 2 is set to the movable member 109. It is also possible to set a smaller value. In addition, since the movable object is a laminate of metal and resin, the impact resistance due to vibration is high, and the power generator is highly reliable.

  In addition, when the width and thickness of the three electrets 117 that form the electret part 107 and the width (thickness) and spacing of the three solid metals 119 that form the movable member 109 are the same, It is more desirable because the change in electric capacity occurs in synchronism and more efficient power generation is possible.

<Third Embodiment>
Next, an electrostatic induction power generating device according to a third embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a longitudinal sectional view of the electrostatic induction power generating device of the third embodiment. 6 is a cross-sectional view in the direction of the arrows along the line CC ′ of the electrostatic induction power generating device of the third embodiment shown in FIG.

  As shown in FIGS. 5 to 6, the electrostatic induction power generating device 200 of the third embodiment includes a tubular member 2, a tubular electrode 203 provided on the outer surface of the tubular member 2, and the inside of the tubular member 2. The space 2a has a rod-shaped electrode 5 disposed so as to extend in parallel with the axis of the tubular member 2, and a through-hole through which the rod-shaped electrode 5 is inserted, and reciprocally moves on the rod-shaped electrode 5 in the longitudinal direction. And a movable member 209 having an electret part 207 provided on a part of the surface. Compared to the electrostatic induction power generation device 1 of the first embodiment, the configurations of the cylindrical electrode 203, the electret part 207, and the movable member 209 are different. The following description will be made only on points that are different from the first embodiment, and the same points as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

  The cylindrical electrode 203 includes an electrode part 213 having a shape obtained by dividing the cylindrical electrode 3 of the first embodiment in the longitudinal direction of the tubular member 2, and an insulating part 223 made of an insulator having the same shape and the same size. Are alternately arranged in the longitudinal direction. In this embodiment, the number of arrangements is three for the electrode portions 213 and two for the insulating portions 223. An acrylic resin was used for the insulating portion 223. The cylindrical electrode 203 is fixed to the surface of the tubular member 2 by the insulating tape 13. A hole (not shown) is formed in the insulating tape 13, and each electrode portion 213 is connected to the wiring 20 through the hole.

  The length of the tubular member 2 is provided on the cylindrical electrode 203 facing the electret part 207 provided on the surface of the movable member 209 when the movable member 209 moves in the space 2a inside. This is the length that allows the surface area of the electrode part 213 to be changed.

  The movable member 209 is a cylinder formed of a solid metal made of low resistance stainless steel. The movable member 209 is formed in substantially the same size in the cross-sectional direction with respect to the space 2a in the tubular member 2, and moves freely only in the longitudinal direction of the space 2a.

  In addition, although the shape of the movable member 209 was illustrated with the cylinder, it is not limited to this shape. However, also in this case, it is desirable to have the same cross-sectional shape as the space 2 a inside the tubular member 2.

  Further, on the line connecting the centers of the left and right side surfaces of the movable member 209, a through hole 215 extending in the moving direction is provided in the same manner as the through hole 15 of the first embodiment, and the rod-like electrode 5 is inserted. .

  An electret portion 207 including three electrets 217 is provided on the outer periphery of the movable member 209. The electret 217 has a band shape and is formed by being wound around the outer periphery of the movable member 209. The electret part 207 is provided with three electrets 217 formed at intervals in the moving direction of the movable member 209. Since the material and the forming method are the same as those of the electret portion 7 of the first embodiment, description thereof is omitted.

  The operation of the electrostatic induction power generating device 200 of this example is the same as that of the first embodiment and the second embodiment. However, the cylindrical electrode 203 is formed by alternately forming the metal portions 213 and the insulating portions 129, and the electret portions 207 provided on the outer periphery of the movable member 209 are at least two electrets 217 are moved by the movable member 209. Since the electrets frequently enter and leave the space between the cylindrical electrode 203 and the rod-shaped electrode 5 by being provided at intervals in the direction, the electric capacity between the cylindrical electrode 203 and the electret 217 is increased. Changes occur frequently. Therefore, power generation efficiency can be improved. Moreover, since the rod-shaped electrode 5 is inserted into the through-hole 215 provided in the movable member 209, the movement of the movable member 209 is stabilized, so that the tubular member 2 and the movable member 209 do not contact carelessly. In addition, since the electret part 207 provided on the outer periphery of the movable member 209 is not damaged, it is possible to generate power stably over a long period of time.

  In addition, if the width and interval of the three electrets 217 forming the electret portion 207 and the width and interval of the three electrode portions 213 forming the cylindrical electrode 203 are the same, the capacitance change at a plurality of locations. Are more desirable because they are generated synchronously and more efficient power generation is possible.

<Fourth embodiment>
Next, an electrostatic induction power generating device according to a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a longitudinal sectional view of the electrostatic induction power generating device of the fourth embodiment. FIG. 8 is a cross-sectional view in the direction of the arrows along the line DD ′ of the electrostatic induction power generating device of the fourth embodiment shown in FIG.

  As shown in FIGS. 7 to 8, the electrostatic induction power generating device 300 of the fourth embodiment is provided on the tubular member 2 and the outer surface of the tubular member 2, and the electret portion 7 is formed on a part thereof. A cylindrical electrode 3, a rod-shaped electrode 5 disposed in the space 2 a inside the tubular member 2 so as to extend in parallel with the axis of the tubular member 2, and a through-hole through which the rod-shaped electrode 5 is inserted, And a movable member 309 that can reciprocate in the longitudinal direction on the rod-shaped electrode 5. Compared to the electrostatic induction power generation device 1 of the first embodiment, the configuration of the movable member 309 is different. The following description will be made only on points that are different from the first embodiment, and the same points as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

  The movable member 309 is a cylinder formed of a solid metal made of low resistance stainless steel. The movable member is formed in substantially the same size in the cross-sectional direction with respect to the space 2a in the tubular member 2, and moves freely only in the longitudinal direction of the space 2a.

  On the line connecting the centers of the left and right side surfaces of the movable member 309, a through hole 315 extending in the moving direction is provided in the same manner as the through hole 15 of the first embodiment. The through-hole 315 has a circular cross-sectional shape, and the size of the cross-section is substantially the same as that of the rod-shaped electrode 5. The rod-shaped electrode 5 is inserted into the through hole 315 so as to contact the movable member 309.

  In addition, the movable member 309 is provided with two second through holes 319 extending in the moving direction separately from the through holes 315. The second through hole 319 has a circular cross-sectional shape.

  The cross-sectional shape of the through holes 315 and 319 is not limited to a circle, and may be an ellipse or a polygon such as a rectangle. However, the cross-sectional shape of the through hole 315 is desirably the same cross-sectional shape as the rod-shaped electrode 5. Further, the number of second through holes 319 is not limited to two, and may be one or three or more.

  The operation of the electrostatic induction power generating device 300 of this example is the same as that of the first embodiment. However, since the second through hole 319 in which the rod-like electrode 5 is not inserted is provided in the movable member 309, the second through hole 319 becomes a vent hole and air resistance due to movement may be reduced. Therefore, a high speed can be obtained, and the kinetic energy that becomes the conversion source of the obtained electric energy becomes high. This is particularly effective when the movable member 309 is in a closed space like the tubular member 2 as in this embodiment.

  The present invention is not limited to the embodiments described in detail, and various modifications may be made without departing from the gist of the present disclosure. For example, the cylindrical electrode 3 may be formed not on the inner surface of the tubular member 2 but on the outer surface or inside of the tubular member 2. Even in this case, when the movable members 9, 109, 209, and 309 move, the electric capacity between the electrodes changes, and it is possible to extract electric energy.

DESCRIPTION OF SYMBOLS 1 Static induction type generator 2 Tubular member 3 Cylindrical electrode 5 Rod-shaped electrode 7 Electret part 9 Movable member 12b, 12c Movement control part 17b, 17c Buffer body 15,115,215,315 Through-hole 100 Static of 2nd Embodiment Electric induction power generation apparatus 107 Electret part 109 Movable member 117 Electret 119 Solid metal part 129 Insulating part 200 Electrostatic induction power generation apparatus 203 of the third embodiment Tubular electrode 207 Electret part 209 Movable member 213 Electrode part 219 Movable member 223 Insulating part 300 Electrostatic induction power generator 309 of the fourth embodiment Movable member

Claims (7)

A tubular member formed of an insulating material;
A movement restricting portion provided at both ends of the tubular member;
A cylindrical movable member provided in the tubular member so as to be capable of reciprocating, wherein at least a part is made of solid metal and provided with a through hole extending in the same direction as the reciprocating direction. ,
A rod-shaped central metal member provided parallel to the axis of the tubular member and inserted through the through hole of the movable member;
A cylindrical electrode provided on the tubular member,
An electret part is formed on either a part of the outer periphery of the movable member or a part of the cylindrical electrode,
The electrostatic induction power generation characterized in that the tubular member has a length capable of changing a surface area of the cylindrical electrode or the movable member facing the electret portion by the movement of the movable member. apparatus.   The electrostatic induction power generating device according to claim 1, wherein the movable member and the central metal member are disposed so as to contact each other in the through hole. The movable member is configured by alternately laminating a solid metal and an insulator in a moving direction, of which at least two layers are the solid metal,
The electret portion formed on a part of the cylindrical electrode is formed such that a portion where the electret is formed and a portion where the electret is not formed are alternately formed, and at least two of the electret portions are formed with the electret. The electrostatic induction power generating device according to claim 1 or 2. The cylindrical electrode is configured by alternately forming a solid metal and an insulator in the moving direction of the movable member, at least two of which are the solid metal,
The electret portion formed on a part of the outer periphery of the movable member is formed such that a portion where the electret is formed and a portion where the electret is not formed are formed alternately, and at least two of the electret portions are formed. The electrostatic induction power generating device according to claim 1 or 2, characterized in that   5. The electrostatic induction power generating device according to claim 1, wherein an elastic buffer is provided on an inner surface side of the movement restricting portion.   The electrostatic induction power generating device according to claim 1, wherein the tubular member and the movable member have the same cross-sectional shape. The electrostatic induction type according to claim 1, wherein the movable member is provided with a through hole extending in a reciprocating direction other than the through hole through which the central wiring metal is inserted. Power generation device.