JP6317156B2 - Power generator - Google Patents

Description

  The present invention relates to a power generation device using an electret material and a portable electric device using the power generation device.

  There is a power generation device using an electret material having a property of retaining a charge semipermanently. This power generation device includes an electret electrode made of an electret material and a counter electrode facing the electret electrode, and generates electric power using electrostatic induction generated when the overlapping area of both changes. Such a power generator is relatively small and has the advantage that it can convert the vibration of the electrodes caused by the movement of the device itself into electrical energy. For this reason, the use of portable electric devices that are worn or carried by people, such as wristwatches, is being studied.

  Usually, in the power generation device, in order to improve the power generation efficiency, a plurality of electret electrodes are arranged side by side with a space therebetween, and a plurality of counter electrodes are also arranged side by side so as to face this. According to such a configuration, it is possible to simultaneously extract electric power from a plurality of counter electrodes by moving each counter electrode relative to each electret electrode (see, for example, Patent Document 1).

JP 2011-45194 A

  In the above-described power generation apparatus, ideally, it is desirable that each counter electrode repeats complete charge and discharge with relative movement. However, when the distance between the adjacent electret electrodes is reduced due to a request for downsizing of the power generation device or the like, even if the opposing electrode is not opposed to the electret electrode, electrostatic induction is generated between the neighboring electret electrodes. There is a fear. 9A and 9B are schematic diagrams for explaining such a state. FIG. 9A is a cross-sectional view of each electrode in a state where the electret electrode 101 and the counter electrode 102 face each other in the front (opposed state). FIG. 9B is a cross-sectional view of the state in which the counter electrode 102 moves from the state shown in FIG. 9A along the arrow in the figure and the electret electrode 101 and the counter electrode 102 are not opposed to each other (non-opposing state). is there. Moreover, the broken line in each figure has shown the electric-power line which generate | occur | produces between the electret electrode 101 and the counter electrode 102. FIG. In the state shown in FIG. 9A, it is desirable that the charge induced in the counter electrode 102 is ideally completely discharged in the state shown in FIG. 9B. However, in FIG. 9B, since the distance between the electret electrode 101 and the counter electrode 102 is short, electrostatic induction occurs between them even in this state. In such a case, the next charge is performed without completely discharging the charge induced in the counter electrode 102, leading to a decrease in power generation efficiency.

  The present invention has been made in consideration of such problems, and one of its purposes is a power generation apparatus capable of efficiently generating power using an electret material, and a portable type using the power generation apparatus. To provide electrical equipment.

The invention disclosed in the present application in order to solve the above problems has various aspects, and the outline of typical aspects of the aspects is as follows.

  (1) A plurality of electret electrodes that are each formed into a planar shape by an electret material and are arranged adjacent to each other with a gap along the first surface, and a second surface that faces the first surface And a plurality of counter electrodes arranged to be opposed to the plurality of electret electrodes and configured to be relatively movable along a direction parallel to the second surface with respect to the plurality of electret electrodes, Each of the plurality of electret electrodes includes a facing surface facing the second surface and a base surface opposite to the facing surface, and an edge on the adjacent electret electrode side of the facing surface is The power generation device is located at a position farther from the adjacent electret electrode than an edge of the base surface on the side of the adjacent electret electrode.

  (2) In (1), in each of the plurality of electret electrodes, the thickness of the end portion on the adjacent electret electrode side is smaller than the thickness of the other portion.

  (3) In (1) or (2), in each of the plurality of electret electrodes, an end portion on the opposite surface side of the side surface on the adjacent electret electrode side is inclined toward the side opposite to the adjacent electret electrode. A power generation device characterized by that.

  (4) In any one of (1) to (3), each of the plurality of electret electrodes is formed on a substrate disposed in parallel to the first surface, and the electrets adjacent to each other are formed on the substrate. A power generation device comprising a through hole that occupies a region between electrodes.

  (5) In any one of (1) to (4), each of the plurality of counter electrodes includes a counter surface facing the first surface, and a base surface opposite to the counter surface. The power generator according to claim 1, wherein an edge of the opposing surface on the side of the adjacent counter electrode is located farther from the adjacent counter electrode than an edge of the base surface on the side of the adjacent counter electrode.

  (6) A portable electric device comprising: the power generation device according to any one of (1) to (5); and a load that operates by consuming electric power generated by the power generation device, the portable electric device A portable electric device in which the plurality of counter electrodes are moved relative to the plurality of electret electrodes by their own movement.

  According to the side surface of the above (1), the distance between the electret electrode and the counter electrode can be increased in a state where the electret electrode and the counter electrode do not face each other, and the counter electrode can be discharged reliably.

  According to the side surface of the above (2), the counter electrode can be more reliably discharged by reducing the amount of charge at the end of the electret electrode located near the counter electrode when the electret electrode and the counter electrode are not opposed to each other. it can.

  According to the side surface of the above (3), the angle of the edge of the electret electrode on the side of the adjacent electret electrode can be made larger than 90 degrees, so that the lines of electric force can be prevented from concentrating on the portion, It can be surely discharged.

  According to the side surface of (4) above, it is possible to more easily form the shape of the electret electrode such that the distance between the electret electrode and the counter electrode is large in a state where the electret electrode does not face the counter electrode.

  According to the side surface of the above (5), the distance between the electret electrode and the counter electrode in a state where the counter electrode is not opposed can be further increased.

  According to the above aspect (6), the power generation device can be efficiently generated by the movement of the portable electric device itself.

It is a perspective view which shows schematic structure of the electric power generating apparatus which concerns on embodiment of this invention. It is a block diagram which shows schematic structure of a portable electric equipment provided with the electric power generating apparatus which concerns on embodiment of this invention. It is a fragmentary sectional view of the power generator concerning an embodiment of the invention. It is a top view of an electret electrode. It is a fragmentary sectional view which shows the mode of the electric force line in the opposing state of the electric power generating apparatus which concerns on embodiment of this invention. It is a fragmentary sectional view which shows the mode of the electric force line in the non-opposing state of the electric power generating apparatus which concerns on embodiment of this invention. It is a figure which shows the formation process of an electret electrode. It is a figure which shows the formation process of an electret electrode. It is a figure which shows the formation process of an electret electrode. It is a figure which shows the formation process of an electret electrode. It is sectional drawing which shows the 1st modification of the shape of an electret electrode and a counter electrode. It is sectional drawing which shows the 2nd modification of the shape of an electret electrode and a counter electrode. It is sectional drawing which shows the cross section in the opposing state of the conventional electric power generating apparatus. It is sectional drawing which shows the cross section in the non-opposing state of the conventional electric power generating apparatus.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing a schematic configuration of a power generation apparatus 10 according to an embodiment of the present invention. FIG. 2 is a configuration diagram showing a schematic configuration of the portable electrical device 1 in which the power generation device 10 is built. As shown in FIG. 1, the power generation device 10 includes a first substrate 11, a plurality of electret electrodes 12, a second substrate 13, a plurality of counter electrodes 14, and a rotating shaft 15. . As shown in FIG. 2, the portable electric device 1 includes a power generation device 10, a rectifier circuit 2, a secondary battery 3, and a load 4.

  The first substrate 11 is made of a conductor such as metal and has a substantially disk shape as a whole. The first substrate 11 is provided with a plurality of through holes arranged radially when viewed from the center position. Each of these through holes has a substantially trapezoidal shape, and two sides directed to the outer periphery and the center of the first substrate 11 are formed in an arc shape along the outer periphery of the first substrate 11. Due to the through-holes, a plurality of substantially trapezoidal conductors are formed radially and spaced apart from each other between the center and the outer periphery of the first substrate 11.

  An electret electrode 12 is formed in a film shape on the surface of the substantially trapezoidal conductor formed on the first substrate 11 on the second substrate 13 side. The electret electrode 12 also has a substantially trapezoidal shape as a whole, and two sides directed to the outer periphery and the center of the first substrate 11 are formed in an arc shape along the outer periphery of the first substrate 11. The electret electrode 12 is made of an electret material containing a fluororesin such as polytetrafluoroethylene (PTFE), and holds a negative charge. Here, the electret electrode 12 is negatively charged, but the electret electrode 12 may be made of a positively charged material. The shape and formation method of the electret electrode 12 will be described in detail later. Here, a virtual plane including the surface of each electret electrode 12 on the second substrate 13 side is referred to as a first surface S1. The plurality of electret electrodes 12 are arranged so as to be adjacent to each other with a space along the first surface S1.

  Similarly to the first substrate 11, the second substrate 13 is formed of a conductor such as metal, and the shape and size thereof also correspond to the first substrate 11. That is, the second substrate 13 has a substantially disc shape, and is provided with substantially the same type and the same number of through holes as the first substrate 11. By this through-hole, between the center and the outer periphery of the second substrate 13, approximately the same type and the same number of conductors as the electret electrode 12 are formed in a radial pattern. The plurality of conductors function as the counter electrode 14 as they are. The first substrate 11 and the second substrate 13 are arranged so as to be parallel to and opposed to each other, so that each electret electrode 12 on the first substrate 11 faces the counter electrode 14 of the second substrate 13. It has become. Here, a virtual plane including a surface of the plurality of counter electrodes 14 on the first substrate 11 side is referred to as a second surface S2. The second surface S2 faces the first surface S1, and the plurality of counter electrodes 14 are arranged along the second surface S2 so as to be adjacent to each other with a space therebetween.

  The rotation shaft 15 is arranged so as to be orthogonal to the first surface S1 and the second surface S2 and to penetrate the center of the first substrate 11 and the center of the second substrate 13. Further, the second substrate 13 is supported so as to be rotatable about the rotation shaft 15 as indicated by an arrow in FIGS. On the other hand, the first substrate 11 is fixed to the casing of the portable electrical device 1.

  With such a configuration, the second substrate 13 rotates with the movement of the portable electrical device 1 itself. Although not shown in the drawing, a weight is connected to the second substrate 13 or the rotation shaft 15 in order to rotate the second substrate 13. By the rotation of the second substrate 13, each counter electrode 14 moves relative to the electret electrode 12 on the second surface S <b> 2 so that its overlapping area changes. When each counter electrode 14 moves to a state where it faces one of the electret electrodes 12 from this front (hereinafter referred to as the “opposed state”) by this rotation, the opposite electrode 14 has a polarity opposite to that of the electret electrode 12 due to electrostatic induction (here, A positive charge is charged. Then, when the second substrate 13 further rotates and the counter electrode 14 does not oppose the electret electrode 12, that is, the counter electrode 14 opposes the through hole of the first substrate 11 (hereinafter referred to as a non-opposing state) The charge charged in the counter electrode 14 is discharged. As described above, the charge and discharge of the charges are repeated in each counter electrode 14 by the rotation of the second substrate 13.

  Due to charging / discharging of each counter electrode 14, a current flows from the power generation device 10 to the rectifier circuit 2 side. This current is rectified by the rectifier circuit 2 and input to the secondary battery 3. As a result, the electric power generated by the power generation device 10 is accumulated in the secondary battery 3. The electric power stored in the secondary battery 3 is supplied to the load 4 as necessary. The secondary battery 3 is a chargeable / dischargeable battery such as a lithium secondary battery. The load 4 is a circuit for realizing the function of the portable electric device 1 and operates by consuming electric power supplied from the secondary battery 3. For example, when the portable electrical device 1 is a wristwatch, the load 4 includes a clock circuit and performs various controls such as clocking the current time.

  Hereinafter, the shape of the electret electrode 12 formed on the first substrate 11 will be described. Hereinafter, for convenience of explanation, one electret electrode 12 to be noticed is referred to as a noticeable electret electrode 12a, and the shape of the noticeable electret electrode 12a will be described. However, the other electret electrodes 12 may have the same shape. Hereinafter, one of the two electret electrodes 12 adjacent to the target electret electrode 12a is referred to as an adjacent electret electrode 12b, and the other is referred to as an adjacent electret electrode 12c. Further, the surface (upper surface) on the counter electrode 14 side of each electret electrode 12 is referred to as an opposing surface, and the surface (bottom surface) on the first substrate 11 side opposite to this is referred to as a base surface.

  FIG. 3 is a partial cross-sectional view showing a cross section of the power generation apparatus 10 along the circumferential direction of the first substrate 11 (that is, the arrangement direction of the electret electrodes 12). FIG. 4 is a plan view showing a state in which the electret electrode 12a of interest is viewed from above (the second substrate 13 side). As shown in FIG. 3, the side surface Sa on the adjacent electret electrode 12 b side and the side surface Sb on the adjacent electret electrode 12 c side of the electret electrode 12 a of interest are both formed in an arc shape in a cross-sectional view. That is, at least the end of the side surface Sa on the adjacent electret electrode 12b side of the target electret electrode 12a on the opposite surface side is inclined toward the side opposite to the adjacent electret electrode 12b. Accordingly, as shown in FIG. 4, the outer edge La1 on the adjacent electret electrode 12b side of the opposed surface of the target electret electrode 12a is on the inner side (the adjacent electret electrode 12b and the outer edge La2 on the adjacent electret electrode 12b side). It will be located on the opposite side. Similarly, with respect to the side surface Sb of the target electret electrode 12a on the adjacent electret electrode 12c side, at least the end portion on the opposite surface side is inclined toward the side opposite to the adjacent electret electrode 12c. As a result, the outer edge Lb1 on the adjacent electret electrode 12c side of the facing surface of the target electret electrode 12a is located on the inner side (opposite side of the adjacent electret electrode 12c) than the outer edge Lb2 on the adjacent electret electrode 12c side of the base surface. . Further, the width w1 of the facing surface of the electret electrode 12a of interest is shorter than the width w2 of the base surface. Here, the widths of the opposing surface and the base surface of the electret electrode 12a of interest refer to the length along the circumferential direction of the first substrate 11, and change according to the distance from the center of the first substrate 11. Is. However, since the side surfaces Sa and Sb are inclined, the width w1 of the opposing surface of the electret electrode 12a of interest is the base width at any position as long as the cross section is along the circumferential direction of the first substrate 11. The width of the surface is shorter than w2. More specifically, the lateral width of the electret electrode 12a of interest is narrowed while monotonously decreasing from the base surface toward the opposing surface.

  Since the target electret electrode 12a has such a shape, the distance from the target electret electrode 12a to the adjacent counter electrode 14 in the non-opposing state is larger than that in the example of FIG. It is possible to make it difficult for electrostatic induction to occur between the counter electrode 14 and the counter electrode 14. Thereby, the counter electrode 14 can be discharged more reliably when the non-opposing state is reached. In addition, since the thickness of the target electret electrode 12a is smaller at the left and right ends (that is, the edge close to the adjacent electret electrodes 12b and 12c) than the other portions, the charge amount of the target electret electrode 12a in this portion is It becomes smaller than the central portion, and electrostatic induction in a non-opposing state is less likely to occur. Furthermore, the end portion (upper end) of the opposite electret electrode side surface of the electret electrode 12a of interest is inclined to the opposite side of the adjacent electret electrode, so that the edge angle of the opposite electret electrode side of the opposing surface is 90 degrees. It becomes larger and it becomes difficult to concentrate electric lines of force. Therefore, electrostatic induction in a non-opposing state is less likely to occur. 5A and 5B are partial cross-sectional views of the power generation device 10 in the facing state and the non-facing state, respectively, and show the lines of electric force generated between the electret electrode 12 and the counter electrode 14 with broken lines. Yes. As shown in the figure, electric lines of force are generated in the opposed state in substantially the same manner as in the example of FIG. 9A. However, in the non-opposed state, the distance between the electret electrode 12 and the opposed electrode 14 increases, and Generation of field lines is suppressed. In order to ensure discharge in a non-opposing state, it is conceivable to reduce the lateral width of the electret electrodes 12 and widen the interval between the adjacent electret electrodes 12, but when such a configuration is adopted, the opposing state The amount of power generation at will also decrease. According to the configuration of the present embodiment, the distance to the counter electrode 14 can be increased in the non-opposing state while ensuring the surface area of the electret electrode 12 as much as possible.

  Such a shape of the electret electrode 12 can be realized by forming the electret electrode 12 by, for example, a dispensing method. 6A to 6D are diagrams for explaining the molding process of the electret electrode 12 in this case. Similarly to FIG. 3, the first substrate 11 and the electret electrode 12 are arranged along the circumferential direction of the first substrate 11. A cut section is shown.

  First, an etching process is performed on the first substrate 11 shown in FIG. 6A to provide a substantially trapezoidal through-hole as shown in FIG. 1 (FIG. 6B). Although the through hole is provided here by etching, it may be realized by other methods such as press working or electric discharge machining. Next, a dispensing process is performed to apply a liquid electret material onto the first substrate 11 (FIG. 6C). At this time, as shown in FIG. 6C, the electret material has a shape in which the center rises due to surface tension and the left and right side surfaces are inclined. Furthermore, the electret electrode 12 is shape | molded by performing the curing process which hardens this electret material (FIG. 6D).

  Thus, the electret electrode 12 with the inclined side surface can be easily formed by using the dispensing process. In addition, as described above, by providing a through hole in a region between the electret electrodes 12 adjacent to each other on the first substrate 11 in advance and forming the electret electrode 12 in the remaining region, the edge of the opposing surface can be easily formed. The electret electrode 12 can be formed so as to be located inside the edge of the base surface.

  Further, in the present embodiment, the counter electrode 14 has a shape in which the side surface is inclined similarly to the electret electrode 12. Here, for convenience of explanation, the shape of one counter electrode 14 of interest is described as the target counter electrode 14a, but all the counter electrodes 14 may have the same shape. Of the two counter electrodes 14 adjacent to the target counter electrode 14a, one is referred to as an adjacent counter electrode 14b and the other is referred to as an adjacent counter electrode 14c. Moreover, the surface (lower surface) by the side of the electret electrode 12 of each counter electrode 14 is made into an opposing surface, and the surface (upper surface) on the opposite side is called a base surface.

  As shown in FIG. 3, the side surface Sc on the adjacent counter electrode 14 b side and the side surface Sd on the adjacent target electrode 14 c side of the target counter electrode 14 a are both formed in an arc shape in a cross-sectional view. Thereby, at least the end of the side surface Sc facing the adjacent counter electrode 12b of the target counter electrode 14a is inclined toward the side opposite to the adjacent counter electrode 12b. Thus, the outer edge Lc1 on the adjacent counter electrode 12b side of the counter surface of the target counter electrode 12a is located on the inner side (opposite side of the adjacent counter electrode 12b) than the outer edge Lc2 of the base surface on the adjacent counter electrode 12b side. . Similarly, regarding the side surface Sd on the adjacent counter electrode 12c side of the target counter electrode 12a, at least the end portion on the counter surface side is inclined toward the side opposite to the adjacent counter electrode 12c. As a result, the outer edge Ld1 on the adjacent counter electrode 12c side of the counter surface of the target counter electrode 12a is located on the inner side (opposite side of the adjacent counter electrode 12c) than the outer edge Ld2 of the base surface on the adjacent counter electrode 12c side. . Further, the lateral width w3 of the facing surface of the target counter electrode 12a is shorter than the lateral width w4 of the base surface.

  In this way, not only the electret electrode 12 but also the counter electrode 14 has a shape in which the edge of the counter surface is located inside the edge of the base surface on the side surface on the side of the adjacent counter electrode 14. The distance between the electret electrode 12 and the counter electrode 14 can be further increased.

  In addition, the shape of the electret electrode 12 and the counter electrode 14 which were demonstrated above is only an example. The target electret electrode 12a has an edge on the adjacent electret electrode 12b side of the opposing surface at a position farther from the adjacent electret electrode 12b than an edge on the adjacent electret electrode 12b side of the base surface, and on the adjacent electret electrode 12c side of the opposing surface. Various shapes can be adopted as long as the edge has a shape that is located farther from the adjacent electret electrode 12c than the edge on the adjacent electret electrode 12c side of the base surface. Hereinafter, some modified examples of the shapes of the noticeable electret electrode 12a and the noticeable counter electrode 14a will be described.

  FIG. 7 is a cross-sectional view showing a first modification of the shapes of the noticeable electret electrode 12a and the noticeable counter electrode 14a. In the example of this figure, the side surface along the through hole of the first substrate 11 is formed into an inclined shape such that the end portion on the electret electrode 12 side is chamfered. The electret electrode 12a of interest is formed with a constant thickness on the first substrate 11 having an inclined end. Even with such a configuration, as in the example of FIG. 3, the opposite end portions of the left and right side surfaces of the electret electrode 12 a are inclined inward. Further, the edge La1 on the adjacent electret electrode 12b side of the facing surface of the electret electrode 12a is located farther from the adjacent electret electrode 12b than the edge La2 on the adjacent electret electrode 12b side of the base surface, and the adjacent electret electrode 12c on the facing surface. The edge Lb1 on the side is also at a position farther from the adjacent electret electrode 12c than the edge Lb2 on the adjacent electret electrode 12c side of the base surface. Similarly, the counter electrode 14a of interest is also processed to have an inclined end on the counter surface side. Thereby, compared with the example of FIG. 9B, the distance between the electret electrode 12 and the counter electrode 14 in the non-opposing state is increased.

  FIG. 8 is a cross-sectional view showing a second modification of the shape of the noticeable electret electrode 12a and the noticeable counter electrode 14a. In the example of this figure, a step is provided at the end portion on the side of the electret electrode 12 on the side surface along the through hole of the first substrate 11. The electret electrode 12a of interest is formed with a constant thickness on the first substrate 11 having a step at the end. In such a configuration, unlike the examples of FIGS. 3 and 7, the opposite end portions of the left and right sides of the electret electrode 12a of interest are not inclined. However, as in the example of FIGS. 3 and 7, the edge La1 on the adjacent electret electrode 12b side of the opposed surface of the electret electrode 12a is separated from the adjacent electret electrode 12b than the edge La2 on the adjacent electret electrode 12b side of the base surface. The edge Lb1 on the adjacent electret electrode 12c side of the opposing surface is also at a position farther from the adjacent electret electrode 12c than the edge Lb2 on the adjacent electret electrode 12c side of the base surface. Similarly, the target counter electrode 14a is also provided with a step at the end on the counter surface side so that the adjacent counter electrode side edge of the counter surface is located on the inner side of the base surface edge. Thereby, like the example of FIG.3 and FIG.7, the distance between the electret electrode 12 and the counter electrode 14 in a non-opposing state can be enlarged.

  In addition, this invention is not restricted to what was demonstrated above. For example, in the above description, the electret electrode 12 and the counter electrode 14 are both arranged in a ring. However, the present invention is not limited thereto, and the electret electrode 12 and the counter electrode 14 may be arranged in a straight line, and the counter electrode 14 may reciprocate along the straight line so that the overlapping area with the electret electrode 12 changes. . Further, in the above description, the position of the electret electrode 12 is fixed, and the overlapping area of the both changes as the position of the counter electrode 14 changes. On the contrary, the position of the counter electrode 14 is fixed. However, the electret electrode 12 side may be moved.

  DESCRIPTION OF SYMBOLS 1 Portable electric device, 2 Rectifier circuit, 3 Secondary battery, 4 Load, 10 Power generator, 11 1st board | substrate, 12 Electret electrode, 13 2nd board | substrate, 14 Counter electrode, 15 Rotating shaft.

Claims (6)

A substrate,
A plurality of electret electrodes , each formed in a planar shape by an electret material and arranged adjacent to each other with a space on the substrate;
A second surface facing the substrate is disposed to face the plurality of electret electrodes, and is movable relative to the plurality of electret electrodes along a direction parallel to the second surface. A plurality of counter electrodes configured;
With
Each of the plurality of electret electrodes is provided in a formation region on the substrate,
The formation region is a first region that faces the second surface, and a second region that is closer to the electret electrode side than the first region and is farther from the second surface than the first region. And
An end portion of each of the plurality of electret electrodes on the side of the adjacent electret electrode is provided on the second region . The power generator according to claim 1 ,
The front Stories substrate, power generating apparatus characterized by through holes that occupy space between adjacent electrets electrodes are provided mutually. The power generator according to claim 2,
Of the side surface along the through hole of the substrate and on the side of the adjacent electric electrode, the end on the second surface side is inclined toward the side opposite to the adjacent electret electrode,
An end of each of the plurality of electret electrodes on the side of the adjacent electret electrode is formed with the slope,
A power generator characterized by that. The power generator according to claim 2,
Having a step in a region along the through hole of the substrate in plan view;
The adjacent electret electrode side ends of the plurality of electret electrodes are formed on the step,
A power generator characterized by that. In the electric power generating apparatus as described in any one of Claim 1 to 4,
Each of the plurality of counter electrodes is
An opposing surface facing the substrate , and a base surface opposite to the opposing surface,
An edge of the opposing surface on the side of the adjacent counter electrode is located farther from the adjacent counter electrode than an edge of the base surface on the side of the adjacent counter electrode. A power generator according to any one of claims 1 to 5,
A load that operates by consuming electric power generated by the power generation device;
A portable electric device comprising:
The portable electric device is characterized in that the movement of the portable electric device itself causes the plurality of counter electrodes to move relative to the plurality of electret electrodes.

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