JP2010279192A - Power plant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power plant that has simple structure is miniaturized as a whole, and is able to efficiently generate power. <P>SOLUTION: A first electrode 22, which includes a radial section 24 radially formed from a shaft hole 17a, namely a rotation center section, and an electret film 25, namely, a charge holding body, are disposed on a rotary plate 17 rotating on a plane of a bottom board 15, namely, a flat substrate provided in a clock module 6; meanwhile, a second electrode 26 including a radial section 27 formed radially is so disposed on the bottom board 15 as to oppose the radial section 24 of the first electrode 22; and thus the rotary plate 17 is rotated at a fixed interval to the bottom board 15, and a mechanical rotational kinetic energy of the rotary plate 17 is efficiently converted to electrical energy. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power generation device using electrostatic induction.

  2. Description of the Related Art Conventionally, a power generation device as described in Patent Document 1 is known as a power generation device using electrostatic induction. In this power generation device, a fixed substrate on which a plurality of electret electrodes, which are charge holding members for holding charges, are arranged, and a movable substrate on which a plurality of movable electrodes are provided are arranged to face each other, and in this state, external vibration is generated. The movable substrate moves in an arbitrary direction in the plane direction, and the electret electrode and the movable electrode move relative to each other to change the induced charge amount between the electret electrode and the movable electrode to generate power. It is configured as follows.

JP 2008-86190 A

  However, since such a conventional power generation device has a structure that converts relative mechanical kinetic energy between the fixed substrate and the movable substrate into electric energy, the movable substrate with respect to the fixed substrate when subjected to external vibration. In order to move the movable substrate in any direction in the plane direction, it is necessary to hold each of the four sides of the movable substrate with a spring member or the like, and in the plane direction with the movable substrate kept at a fixed interval with respect to the fixed substrate. In order to make the parallel movement, a guide member for guiding the movable substrate is required, which causes a problem that the structure becomes complicated and the entire apparatus cannot be reduced in size.

  The problem to be solved by the present invention is to provide a power generation device that can reduce the size of the entire device with a simple structure and can generate power efficiently.

In order to solve the above problems, the present invention includes the following components.
According to the first aspect of the present invention, there is provided a flat substrate, a rotating member that rotates on the plane of the substrate, and a radiating portion that is radially formed on the rotating member from the rotation center portion of the rotating member. One electrode, a second electrode provided with a radiation portion formed on the flat substrate so as to face the radiation portion of the first electrode, and provided on one of the first electrode and the second electrode And a charge holding body provided.

  According to a second aspect of the present invention, the rotating member includes a small-diameter circular portion, and a semicircular arc portion formed in a substantially semicircular arc shape having a larger diameter than the circular portion on the outer peripheral portion of the small-diameter circular portion. The power generation device according to claim 1, wherein the power generation device is provided.

  The invention according to claim 3 is characterized in that the radiation portion of the first electrode is formed in a substantially semicircular arc shape in the semicircular arc portion of the rotating member. It is.

  The invention according to claim 4 is the power generator according to claim 2, wherein the radiating portion of the first electrode is formed in a circular shape in the small-diameter circular portion of the rotating member. is there.

  According to a fifth aspect of the present invention, there is provided a power storage unit that stores a charge generated by relative rotation between the first electrode and the second electrode. It is an electric power generating apparatus in any one.

  According to a sixth aspect of the present invention, the rotating member is made of a conductive metal, and a rotation center portion of the rotating member is rotatably attached to a conductive shaft member protruding from the substrate by a conductive bearing member. The power storage unit is provided on a circuit board, and the first electrode and the power storage unit are electrically connected to each other through the circuit board, the shaft member, and the bearing member, The second electrode and the power storage unit are electrically connected to each other through the circuit board and a connecting member that connects the circuit board and the second electrode, respectively. 5. The power generation device according to 5.

  According to this invention, since the rotating member rotates on the plane of the flat substrate by external vibration, the rotating member can be rotated at a constant interval with respect to the substrate without using the guide member. Since the charge holding body provided on one of the first electrode provided on the rotating member and the second electrode provided on the substrate rotates relative to the other electrode, the rotating member Mechanical rotational kinetic energy can be efficiently converted into electrical energy. Therefore, the structure is simple, the entire apparatus can be reduced in size, and power can be generated efficiently.

1 is an enlarged cross-sectional view showing Embodiment 1 of an electronic wristwatch to which the present invention is applied. It is the enlarged bottom view which looked at the electronic wristwatch of FIG. 1 from the lower surface side. FIG. 3 is an enlarged bottom view showing a state where a back cover is removed from the electronic wristwatch of FIG. 2. FIG. 4 is an enlarged bottom view showing the timepiece module of FIG. 3. It is the expansion perspective view which showed the timepiece module of FIG. FIG. 4 is an enlarged bottom view showing a state where a rotating plate is removed from the timepiece module of FIG. 3. It is the expanded sectional view which showed the A section of FIG. FIG. 6 is an enlarged perspective view showing the rotating plate of FIG. It is the enlarged plan view which looked at the rotating plate of FIG. 8 from upper direction. It is the figure which showed the circuit structure of the electric power generating apparatus integrated in the electronic wristwatch of FIG. It is the expanded sectional view which showed the principal part of the electric power generating apparatus in Embodiment 2 of the electronic wristwatch to which this invention is applied. It is the enlarged plan view which showed the rotating plate in the electric power generating apparatus of FIG. FIG. 12 is an enlarged bottom view showing the main plate side of the timepiece module in the power generator of FIG. 11. It is the expanded sectional view which showed the principal part of the electric power generating apparatus in Embodiment 3 of the electronic wristwatch to which this invention is applied. FIG. 15 is an enlarged plan view showing a rotating plate in the power generation device of FIG. 14. FIG. 15 is an enlarged bottom view showing the main plate side of the timepiece module in the power generation device of FIG. 14. It is the expanded sectional view which showed the principal part of the electric power generating apparatus in Embodiment 4 of the electronic wristwatch to which this invention is applied. FIG. 18 is an enlarged plan view showing a rotating plate in the power generation device of FIG. 17. FIG. 18 is an enlarged bottom view showing the main plate side of the timepiece module in the power generation device of FIG. 17. It is the expanded sectional view which showed Embodiment 5 of the electronic wristwatch to which this invention is applied. It is the expansion perspective view which showed the state which looked at the timepiece module of FIG. 20 from the lower surface side. It is an expanded sectional view which showed the B section of FIG. FIG. 22 is an enlarged bottom view showing the rotating plate of FIG. 21. It is the enlarged plan view which showed the state which looked at the back cover of FIG. 20 from upper direction. FIG. 10 is an enlarged plan view showing a modification of the second electrode provided on the back cover of the fifth embodiment. It is the enlarged plan view which showed the modification of the rotating plate in Embodiments 1-5.

(Embodiment 1)
A first embodiment in which the present invention is applied to an electronic wristwatch will be described below with reference to FIGS.
As shown in FIG. 1, the electronic wristwatch includes a wristwatch case 1. The wristwatch case 1 includes a case main body 2 and a ring-shaped bezel 3 provided on the upper outer periphery of the case main body 2.

A watch glass 4 is attached to the upper opening of the watch case 1, that is, the upper opening of the bezel 3 via a packing 4 a, and the lower part of the watch case 1, that is, the lower part of the case body 2, As shown in FIG. 2, a back cover 5 is attached via a waterproof ring 5a. A watch module 6 is provided in the watch case 1. As shown in FIG. 1, the timepiece module 6 includes an upper housing 7 and a lower housing 8, and a circuit board 9 is provided therebetween.

In this case, a dial plate 10 is provided on the upper surface of the upper housing 7. A clock movement (not shown) is provided in the upper housing 7. In this timepiece movement, the pointer shaft 11 a protrudes above the dial plate 10, and hands 11 b such as a second hand, a minute hand, and an hour hand are attached to the protruding upper end portion, and the pointer 11 b moves the dial 10 above the dial plate 10. Thus, the time is indicated.

Further, as shown in FIGS. 3 to 6, the lower housing 8 is provided with a battery housing portion 13 for housing the battery 12 and an antenna 14. As shown in FIG. 6, a metal base plate 15 is provided on the lower surface (the front surface in FIG. 6) of the lower housing 8 except for portions corresponding to the battery housing portion 13 and the antenna 14. The base plate 15 is provided with a plurality of hook portions 15 a at the peripheral edge thereof, and the plurality of hook portions 15 a are locked to the side surface of the upper housing 7, thereby fixing the upper housing 7 to the lower housing 8. It is configured as follows.

As shown in FIGS. 1 and 7, a power generation device 16 is provided on the lower surface side (front surface side in FIG. 6) of the lower housing 8. The power generation device 16 includes a ground plate 15 that is a flat substrate and a rotating plate 17 that rotates to face the plane of the ground plate 15. The rotating plate 17 is made of a conductive metal. As shown in FIG. 1, the center portion of the rotating plate 17 is attached to the lower housing 8 and protrudes below the ground plate 15. It is attached.

That is, as shown in FIG. 1, the fixed shaft 18 is screwed into a nut portion 8 a embedded in the lower housing 8 through a shaft hole 17 a provided in the center portion of the rotating plate 17, thereby being attached to the lower housing 8. It is attached. The rotary plate 17 is provided with a bearing 19 corresponding to the shaft hole 17a at the center thereof, and the bearing 19 is rotatably attached to the fixed shaft 18, so that a constant interval is always maintained with respect to the lower surface of the main plate 15. In this state, it is configured to rotate around the fixed shaft 18.

In this case, the fixed shaft 18 and the nut portion 8a are made of a conductive metal, and the nut portion 8a is electrically connected to the circuit board 9 disposed between the upper housing 7 and the lower housing 8. Yes. Thus, the rotating plate 17 is electrically connected to the circuit board 9 via the fixed shaft 18 and the nut portion 8a. The fixed shaft 18 is disposed on the same axis as the pointer shaft 11a of the timepiece movement, but is not necessarily disposed on the same shaft as the pointer shaft 11a.

Further, as shown in FIGS. 5, 8, and 9, the rotating plate 17 includes a small-diameter circular portion 20 and a semicircular arc portion having a larger diameter than the small-diameter circular portion 20 and formed in a substantially semicircular arc shape. 21. The small-diameter circular portion 20 is provided with a shaft hole 17a into which the fixed shaft 18 is inserted at the center thereof. The semicircular arc portion 21 is integrally formed on the outer peripheral portion of the small-diameter circular portion 20 with the weight portion 21a provided on the outer peripheral portion. Thus, the rotating plate 17 is configured to rotate around the fixed shaft 18 by the inertia of the weight portion 21a of the semicircular arc portion 21 when receiving external vibration.

Further, as shown in FIGS. 1 and 7 to 9, the first electrode 22 is provided on the upper surface of the rotating plate 17 via an insulating film 23. In this case, as shown in FIGS. 8 and 9, the insulating film 23 is provided over almost the entire upper surface of the semicircular arc portion 21 of the rotating plate 17. The first electrode 22 provided on the insulating film 23 includes a radial portion 24 that is formed radially from the shaft hole 17 a that is the rotation center portion of the rotating plate 17.

As shown in FIGS. 7, 8, and 9, the radial portion 24 has a large number of electrode pieces 24 a radially arranged on the insulating film 23 provided on the semicircular arc portion 21 of the rotating plate 17 at regular intervals. It is configured. That is, in the radial portion 24, a large number of electrode pieces 24a are elongated in the radial direction with a substantially constant width, and adjacent electrode pieces 24a are arranged with a gap of a constant interval.

Further, the radial portion 24 is guided to the side of the insulating film 23 and electrically connected to the rotating plate 17 in a state where a large number of electrode pieces 24a are all connected at the inner peripheral end and the outer peripheral end. Yes. Thereby, the first electrode 22 is electrically connected to the circuit board 9 via the rotating plate 17 and the fixed shaft 18. Further, as shown in FIG. 7, an electret film 25 that is a charge holding member is formed on each electrode piece 24a. The electret film 25 is an insulator having a semi-permanent charge, and is made of a charge holding material such as a fluorocarbon resin or an amorphous fluororesin.

Examples of the charge holding material that can be used as the electret film include polypropylene (PP), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polystyrene (PS), polytetrafluoroethylene (PTFE), and tetrafluoroethylene-perfluoro. Alkyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-ethylene copolymer (ETFE), polyvinylidene fluoride (PVDF), polychlorotrifluoroethylene (PCTFE) ), chlorotrifluoroethylene - ethylene copolymer (ECTFE), and polyvinyl fluoride polymeric charge retaining material such as chloride (PVF) or silicon oxide, (SiO ₂₎ Contact An inorganic charge retaining material such as microcrystalline silicon nitride (SiN).

On the other hand, as shown in FIGS. 6 and 7, a second electrode 26 is provided via an insulating film 27 on the lower surface of the ground plate 15, which is a substrate facing the rotating plate 17. In this case, as shown in FIG. 6, the insulating film 27 is approximately half of the semicircular arc of the first electrode 22 at a position corresponding to the movement locus on which the first electrode 22 of the rotating plate 17 rotates ( The second electrode 26 is provided on the lower surface (the front surface in FIG. 6) of the insulating film 27. The second electrode 26 is made of a conductive metal and includes radial portions 28 that are formed radially from the fixed shaft 18 that is the rotation center portion of the rotating plate 17.

As shown in FIG. 6, the radial portion 28 has a configuration in which a large number of electrode pieces 28 a are radially arranged on the insulating film 27 provided on the ground plane 15 at regular intervals. That is, in the radial portion 28, like the radial portion 24 of the first electrode 22, a large number of electrode pieces 28 a are elongated in the radial direction with a substantially constant width, and the electrode pieces 28 a adjacent to each other are formed. Except for a part, they are arranged with gaps at regular intervals. The radial portion 28 is exposed on the upper surface of the insulating film 27 in a state where a large number of electrode pieces 28a are all connected at the inner and outer peripheral ends, and the exposed portion is exposed as shown in FIG. The circuit board 9 is electrically connected by a connection member 29 such as a coil spring.

As a result, when the rotating plate 17 rotates and the first electrode 22 provided on the rotating plate 17 rotates and moves relative to the second electrode 26 provided on the ground plate 15, The electret film 25 formed on the multiple electrode pieces 24 a of the first electrode 22 and the multiple electrode pieces 28 a of the second electrode 26 move relatively, and the electret film 25 and the second electrode 26 of the first electrode 22 move relative to each other. When the amount of induced charge between and changes, power is generated.
That is, when the electret film 25 and the second electrode 26 of the first electrode 22 move relative to each other, the electric charge on the electret film 25 side flows to the opposing second electrode 26 side due to electrostatic induction, thereby generating power. .

Next, the circuit configuration of the power generator 16 will be described with reference to the principle diagram shown in FIG.
In the power generation device 16, the first electrode 22 is connected to the first and second rectifiers 30 and 31, and the second electrode 26 is connected to the third and fourth rectifiers 32 and 33. The first rectifier 30 is connected to the positive electrode (+) of the storage battery 34, the second rectifier 31 is connected to the negative electrode (−) of the storage battery 34, the third rectifier 32 is connected to the positive electrode (+) of the storage battery 34, and the fourth The rectifier 33 is configured to be connected to the negative electrode (−) of the storage battery 34.

In this case, the first rectifier 30 and the fourth rectifier 33 store charges in the storage battery 34 when the first electrode 22 rotates in one direction (for example, clockwise direction) with respect to the second electrode 26. It is configured to rectify the current flow. The second rectifier 31 and the third rectifier 32 store the electric charge in the storage battery 34 when the first electrode 22 rotates in the reverse direction (for example, counterclockwise direction) with respect to the second electrode 26. It is configured to rectify the current flow.

Next, the case where the electronic wristwatch is used by being attached to the arm will be described.
First, when the electronic wristwatch is lightly shaken while walking while waving an arm, the rotating plate 17 rotates due to the inertia of the weight portion 21a of the semicircular arc portion 21 provided on the outer peripheral portion of the small-diameter circular portion 20. At this time, since the weight portion 21 a is provided on the outer peripheral portion of the semicircular arc portion 21, an inertial force is generated in the rotating plate 17 according to the swing of the arm, and the rotating plate 17 is made to the ground plate 15 by this inertial force. Rotates at regular intervals.

At this time, the rotating plate 17 does not necessarily rotate once (360 ° angle rotation) but swings within an angle range corresponding to the inertial force caused by the arm swing. For this reason, the rotating plate 17 rotates, for example, clockwise by a predetermined angle and then rotates counterclockwise by a predetermined angle. By repeating this operation, the power generation is repeated and stored in the storage battery 34. At this time, when the rotating plate 17 rotates within an angle range of 180 °, the electret film 25 formed on the multiple electrode pieces 24a of the first electrode 22 and the multiple electrode pieces 25a of the second electrode 26 are always Since they move relative to each other in a state of facing each other, power is generated continuously.

That is, when the rotating plate 17 rotates clockwise by an angle within an angular range of 180 °, the electret film 25 and the second electrode 26 formed on the electrode pieces 24a of the first electrode 22 are formed. The pieces 25a move relative to each other, and the amount of induced charges between the many electret films 25 of the first electrode 22 and the many electrode pieces 25a of the second electrode 26 changes. Store in the storage battery 34.

In addition, when the rotating plate 17 rotates counterclockwise at an angle within an angle range of 180 °, a large number of electret films 25 and second electrodes 26 formed on a large number of electrode pieces 24 a of the first electrode 22. The electrode pieces 25a move relatively, and the amount of induced charges between the many electret films 25 of the first electrode 22 and the many electrode pieces 25a of the second electrode 26 changes, thereby generating electric power. The electric charge is stored in the storage battery 34.

On the other hand, when the arm to which the electronic watch is attached is bent and moved quickly in the vertical direction, the rotating plate 17 in the electronic watch has a weight portion of the semicircular arc portion 21 provided on the outer peripheral portion of the small-diameter circular portion 20. By the inertia by 21a, it rotates continuously in the same direction (clockwise or counterclockwise). At this time, since the first electrode 22 having a large number of electret films 25 is provided on the semicircular arc portion 21, the second electrode 26 is moved to the first electrode when the rotating plate 17 is rotated halfway (rotated 180 °). However, in the next half rotation (angle rotation of 180 ° to 360 °), the range in which the second electrode 26 faces the first electrode 22 becomes narrower, and the first and second There is a range where the electrodes 22 and 26 do not face each other.

For this reason, when the rotating plate 17 rotates halfway with the second electrode 26 facing a part of the first electrode 22, the electret film 25 formed on the many electrode pieces 24a of the first electrode 22 and the first electrode 22 The multiple electrode pieces 25a of the two electrodes 26 move relatively, and the amount of induced charges between the multiple electret films 25 of the first electrode 22 and the multiple electrode pieces 25a of the second electrode 26 changes. Thus, electric power is generated and electric charges are stored in the storage battery 34.

Further, at the next half rotation (angle rotation of 180 ° to 360 °), the range in which the second electrode 26 faces the first electrode 22 becomes narrow, and therefore, the plurality of electret films 25 of the first electrode 22 and the second electrode The range in which the amount of induced charge between the electrode pieces 25a of the electrode 26 changes is narrowed, the amount of power generation is reduced, and no power is generated when both the first and second electrodes 22 and 26 are not opposed to each other. . As a result, when the rotating plate 17 continuously rotates in one direction, electric power is generated approximately every half rotation of the rotating plate 17, so that the electric charge is intermittently stored in the storage battery 34 approximately every half rotation.

As described above, according to the power generator 16 of the electronic wristwatch, the ground plate 15 that is a flat substrate provided in the timepiece module 6, the rotating plate 17 that rotates on the plane of the ground plate 15, and the rotating plate 17 A first electrode 22 having a radial portion 24 formed radially from a shaft hole 17a which is a rotation center portion thereof, and a radial shape formed on the ground plate 15 so as to face the radial portion 24 of the first electrode 22. Since the second electrode 26 having the portion 27 and the electret film 25 that is a charge holding body provided on one of the first electrode 22 and the second electrode 26 are provided, the structure of the entire apparatus can be simplified. It is possible to reduce the size and generate power efficiently.

That is, according to the power generation device 16, the rotating plate 17 is configured to rotate on the plane of the flat plate 15 due to external vibration. Therefore, the rotating plate 17 is fixed to the plate 15 without using a guide member. An electret film 25 that is a charge holding body is formed on the first electrode 22 provided on the rotating plate 17 and can be rotated at a constant interval by the shaft 18. The electret film 25 of the first electrode 22 Since the second electrode 26 provided on the base plate 15 is relatively rotated, the mechanical rotational kinetic energy of the rotary plate 17 can be efficiently converted into electric energy. Therefore, the structure is simple, the entire apparatus can be reduced in size, and power can be generated efficiently.

In this case, the rotating plate 17 includes a small-diameter circular portion 20 and a semicircular arc portion 21 having a larger diameter than that of the circular portion 20 and formed in a substantially semicircular arc shape on the outer peripheral portion of the small-diameter circular portion 20. Therefore, when the rotating plate 17 is rotatably attached to the base plate 15 by the fixed shaft 18 at a constant interval, when subjected to external vibration, inertia is generated in the semicircular arc portion 21 of the rotating plate 17, and rotation is caused by this inertia. Since the plate 17 can be rotated at regular intervals with respect to the base plate 15, the rotary plate 17 can be favorably rotated according to external vibration.

For example, if the electronic wristwatch is attached to the arm and the arm is shaken while walking, the rotating plate 17 does not necessarily rotate once (an angle of 360 °), but swings in an angular range corresponding to the inertial force caused by the arm swing. For example, after the rotating plate 17 rotates clockwise at a predetermined angle and then rotates counterclockwise at a predetermined angle, power can be generated by repeating this operation. Also, if the arm to which the electronic wristwatch is attached is bent and moved fast in the vertical direction, the rotating plate 17 rotates in the same direction (clockwise or counterclockwise) by its inertial force, so that the rotating plate 17 is rotated continuously. Can be generated.

  Further, the radial portion 24 of the first electrode 22 has a large number of electrode pieces 24 a arranged in a semicircular arc shape on the semicircular arc portion 21 of the rotary plate 17, so that the rotary plate 17 does not necessarily rotate once (360). When rotating in an angle range (for example, an angle of 180 °) according to the inertia force caused by swinging the arm, the electrode pieces 28a of the second electrode 26 are always attached to the first electrode 22 Since it can be relatively moved while facing the electret film 25 formed on the large number of electrode pieces 24a, it is possible to continuously generate power.

Further, when the rotating plate 17 is continuously rotated according to the inertial force due to the swing of the arm, the radial portion 24 of the first electrode 22 is formed in a semicircular arc shape on the semicircular arc portion 21 of the rotating plate 17. Therefore, when the rotating plate 17 makes a half rotation (180 ° rotation), the second electrode 26 can generate power while facing a part of the first electrode 22, and the next half rotation (180 ° to 360). In the range where the second electrode 26 is opposed to the first electrode 22, the amount of power generation is reduced, and both the first and second electrodes 22, 26 are not opposed to each other. Since power generation is sometimes not performed, power generation can be intermittently performed approximately every half rotation of the rotation plate 17 when the rotation plate 17 rotates continuously.

In addition, according to the power generation device 16, the storage battery 34 that stores electric charges generated by the relative rotation of the first electrode 22 and the second electrode 26 is provided. Charges generated between the electret film 25 of the first electrode 22 and the second electrode 26 provided on the ground plate 15 can be stored in the storage battery 34 in a satisfactory and reliable manner.

Furthermore, according to the power generation device 16, the rotating plate 17 is made of a conductive metal, and the rotation center portion thereof is rotatably attached to the conductive fixed shaft 18 by the conductive bearing 19. 34 is provided on the circuit board 9, and the first electrode 22 and the power storage unit 34 are electrically connected through the circuit board 9, the fixed shaft 18, and the bearing 19, respectively, and the second electrode 26. And the power storage unit 34 are electrically connected to each other through the circuit board 9 and the connection member 29 that connects the circuit board 9 and the second electrode 26, respectively. Even if the configuration is such that the conductive fixed shaft 18 rotates about the angle of 360 ° or more, the first electrode 22 and the power storage unit 34 can be reliably and satisfactorily connected.

(Embodiment 2)
Next, a second embodiment of an electronic wristwatch to which the present invention is applied will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected and demonstrated to the same part as Embodiment 1 shown by FIGS.
In this electronic wristwatch, the first electrode 41 and the second electrode 42 of the power generation device 40 have a configuration different from that of the first embodiment, and the other configurations are substantially the same as those of the first embodiment.

That is, the power generation device 40 includes the ground plate 15 that is a flat substrate and the rotating plate 17 that rotates to face the plane of the ground plate 15, as in the first embodiment. In this case, as shown in FIG. 13, the base plate 15 is formed in a substantially circular shape as a whole and covers the entire lower surface of the lower housing 8. As in the first embodiment, the rotating plate 17 is made of a conductive metal, and a central portion of the rotating plate 17 is attached to the lower housing 8 and is attached to a fixed shaft 18 protruding below the ground plate 15 by a bearing 19 so as to be rotatable. The base plate 15 is configured to rotate in a state in which a constant interval is always maintained.

Further, as shown in FIG. 12, the rotating plate 17 includes a small-diameter circular portion 20 and a semicircular arc portion 21 having a larger diameter than the small-diameter circular portion 20 and formed in a substantially semicircular arc. The small-diameter circular portion 20 is provided with a shaft hole 17a into which the fixed shaft 18 is inserted at the center thereof. The semicircular arc portion 21 is provided with a weight portion 21a on the outer peripheral portion thereof, and is provided on the outer peripheral portion of the small-diameter circular portion 20 in this state. Thus, the rotating plate 17 is configured to rotate around the fixed shaft 18 by the inertia of the weight portion 21a of the semicircular arc portion 21 when receiving external vibration.

Further, as shown in FIGS. 11 and 12, the first electrode 41 is provided on the upper surface of the rotating plate 17 via an insulating film 43. In this case, the insulating film 43 is provided in a circular shape over substantially the entire upper surface of the circular portion 20 of the rotating plate 17. The first electrode 41 provided on the insulating film 43 includes a radial portion 44 that is formed radially from the shaft hole 17 a that is the rotation center portion of the rotating plate 17. As shown in FIG. 12, the radial portion 44 has a configuration in which a large number of electrode pieces 44a are radially arranged on the insulating film 43 provided on the circular portion 20 of the rotating plate 17 at regular intervals.

That is, in the radial portion 44, a large number of electrode pieces 24a are elongated in the radial direction with a substantially constant width, and the adjacent electrode pieces 24a are arranged with a gap of a constant interval. The radial portion 44 is guided to the side of the insulating film 43 and electrically connected to the rotating plate 17 in a state where a large number of electrode pieces 44a are all connected at the inner peripheral end and the outer peripheral end. Yes. Thereby, the first electrode 41 is electrically connected to the circuit board 9 via the rotating plate 17 and the fixed shaft 18. Also in this case, the electret film 25 which is a charge holding body is formed on each electrode piece 44a as in the first embodiment.

On the other hand, as shown in FIGS. 11 and 13, the second electrode 42 is provided on the lower surface of the ground plate 15, which is a substrate facing the rotating plate 17, with an insulating film 45 interposed therebetween. The insulating film 45 is formed in a circular shape having the same size as the first electrode 41 at a position corresponding to the first electrode 41 of the rotating plate 17, and is formed on the lower surface (the front surface in FIG. 13) of the insulating film 45. The second electrode 42 is provided. Similarly to the first embodiment, the second electrode 42 is made of a conductive metal and includes radial portions 46 that are formed radially from the fixed shaft 18 that is the rotation center portion of the rotating plate 17.

As shown in FIG. 13, the radial portion 46 has a configuration in which a large number of electrode pieces 46 a are radially arranged on the insulating film 45 provided on the ground plane 15 at regular intervals. That is, in the radial shape 46, like the radial portion 44 of the first electrode 41, a large number of electrode pieces 46 a are elongated in the radial direction with a substantially constant width, and the adjacent electrode pieces 46 a are constant. They are arranged with gaps between them. Further, the radial portion 46 is exposed on the upper surface side of the insulating film 45 in a state where a large number of electrode pieces 46a are all connected at the inner peripheral end and the outer peripheral end, and as shown in FIG. Is electrically connected to the circuit board 9 by a connection member 29 such as a coil spring.

As a result, when the rotating plate 17 rotates and the first electrode 41 provided on the rotating plate 17 rotates relative to the second electrode 42 provided on the ground plate 15, The electret film 25 formed on the multiple electrode pieces 44a of the first electrode 41 and the multiple electrode pieces 46a of the second electrode 42 move relatively so that the multiple electret films 25 and the second electrode of the first electrode 41 move. It is configured to generate electric power by changing the amount of induced charge between the large number of electrode pieces 46a.

Next, the case where the electronic wristwatch is used by being attached to the arm will be described.
First, when the electronic wristwatch is lightly shaken while walking while waving an arm, the rotating plate 17 rotates with a fixed interval with respect to the base plate 15 according to the swinging of the arm, as in the first embodiment. At this time, the rotating plate 17 does not necessarily rotate once (360 ° angle rotation) but swings within an angle range corresponding to the inertial force caused by the arm swing. For this reason, the rotating plate 17 rotates, for example, clockwise by a predetermined angle and then rotates counterclockwise by a predetermined angle. By repeating this operation, the power generation is repeated and stored in the storage battery 34.

That is, when the rotary plate 17 rotates clockwise by a predetermined angle, the electret film 25 formed on the multiple electrode pieces 44a of the first electrode 41 and the multiple electrode pieces 46a of the second electrode 42 move relatively. Then, when the amount of induced charges between the many electret films 25 of the first electrode 41 and the many electrode pieces 46 a of the second electrode 42 changes, electric power is generated and stored in the storage battery 34.

Also, when the rotating plate 17 rotates counterclockwise by a predetermined angle, the electret film 25 formed on the many electrode pieces 44a of the first electrode 41 and the many electrode pieces 46a of the second electrode 42 The amount of induced charge between the multiple electret films 25 of the first electrode 41 and the multiple electrode pieces 46a of the second electrode 42 changes relative to each other, thereby generating electric power and storing it in the storage battery 34. .

On the other hand, when the arm to which the electronic watch is attached is bent and moved quickly in the vertical direction, the rotating plate 17 is the same due to the inertia of the weight portion 21a of the semicircular arc portion 21 provided on the outer peripheral portion of the small-diameter circular portion 20. Rotates continuously in the direction (clockwise or counterclockwise). At this time, since the first electrode 22 having a large number of electret films 25 is provided in the circular portion 20, the large number of electret films 25 of the first electrode 41 and the large number of electrode pieces 46a of the second electrode 42 are always The amount of induced charge between the large number of electret films 25 of the first electrode 41 and the large number of electrode pieces 46a of the second electrode 42 is changed by rotating relative to each other. The battery 34 is charged.

As described above, according to the power generation device 40 of the electronic wristwatch, in addition to the same effects as the first embodiment, the radial portion 44 of the first electrode 41 is formed in a circular shape on the circular portion 20 of the rotating plate 17. As a result, the electret film 25 formed on the large number of electrode pieces 44a of the first electrode 41 can be relatively moved in a state where the electret film 25 is always opposed to the large number of electrode pieces 46a of the second electrode 42. Since electric power can be generated continuously according to the rotation of the rotating plate 17 due to the swing of the arm, electric power can be generated more efficiently than in the first embodiment.

(Embodiment 3)
Next, a third embodiment of an electronic wristwatch to which the present invention is applied will be described with reference to FIGS. In this case, the same parts as those in the second embodiment shown in FIGS.
In this electronic wristwatch, the first electrode 51 and the second electrode 52 of the power generation device 50 have a different configuration from that of the second embodiment, and the other configurations are the same as those of the second embodiment.

That is, as shown in FIGS. 14 and 15, the first electrode 51 is provided on the upper surface of the rotating plate 17 via the insulating film 53. The insulating film 53 is provided on almost the entire upper surface of the circular portion 20 and the semicircular arc portion 21 of the rotating plate 17. The first electrode 51 provided on the insulating film 53 includes a radial portion 54 that is formed radially from the shaft hole 17 a that is the rotation center portion of the rotating plate 17.

As shown in FIG. 15, in the radial portion 54, a large number of electrode pieces 54a are radially arranged on the insulating film 53 provided across the circular portion 20 and the semicircular arc portion 21 of the rotating plate 17 at regular intervals. It has a configuration. That is, in this radial portion 54, the electrode piece 54 a at the portion located in the circular portion 20 of the rotating plate 17 is formed in a circular shape, and the electrode piece 54 a at the portion located in the semicircular arc portion 21 of the rotating plate 17 is in a semicircular shape. Is formed.

Also in this case, in the radial portion 54, a large number of electrode pieces 54a are elongated in the radial direction with a substantially constant width, and the adjacent electrode pieces 54a are arranged with a gap of a constant interval. . The radial portion 54 is guided to the side of the insulating film 53 and electrically connected to the rotating plate 17 in a state where a large number of electrode pieces 54a are all connected at the inner peripheral end and the outer peripheral end. Yes. On each electrode piece 54a, as in the second embodiment, an electret film 25, which is a charge holding body, is formed.

On the other hand, as shown in FIGS. 14 and 16, the second electrode 52 is provided on the lower surface (surface in FIG. 16) of the ground plate 15, which is the substrate facing the rotating plate 17, with an insulating film 55 interposed therebetween. The insulating film 55 corresponds to a position corresponding to the rotational movement locus on which the first electrode 51 of the rotating plate 17 rotates, that is, a position corresponding to the small-diameter circular portion 20 of the rotating plate 17 and a semicircular arc portion of the rotating plate 17. 21 is formed in substantially the same shape as the first electrode 51 over the corresponding portions on the rotational movement locus 21.

Similar to the second embodiment, the second electrode 52 provided on the lower surface of the insulating film 55 includes radial portions 56 that are formed radially from the fixed shaft 18 that is the rotation center portion of the rotating plate 17. As shown in FIG. 16, the radial portion 56 has a configuration in which a large number of electrode pieces 56 a are radially arranged at a predetermined interval on an insulating film 55 provided on the ground plane 15. That is, the radial portion 56 includes a portion of the electrode piece 56 a corresponding to the small-diameter circular portion 20 of the rotating plate 17 and a portion of the electrode piece 56 a corresponding to the semicircular arc portion 21 of the rotating plate 17.

In this case, as shown in FIG. 16, the radial portion 56 has a portion of the electrode piece 56 a corresponding to the semicircular arc portion 21 of the rotating plate 17 that is approximately half of the first electrode 51 (an angle range of about 90 °). It is the structure formed in the magnitude | size. The radial portion 56 is also exposed on the upper surface of the insulating film 55 in a state where a large number of electrode pieces 56a are all connected at the inner and outer peripheral ends, and the exposed portion is exposed as shown in FIG. The circuit board 9 is electrically connected by a connection member 29 such as a coil spring.

As a result, when the rotating plate 17 rotates and the first electrode 51 provided on the rotating plate 17 rotates relative to the second electrode 42 provided on the ground plate 15, The electret film 25 formed on the multiple electrode pieces 54a of the first electrode 51 and the multiple electrode pieces 56a of the second electrode 52 move relatively, and the multiple electret films 25 and the second electrode of the first electrode 51 move. It is configured to generate power when the amount of induced charge between the multiple electrode pieces 56a of 52 changes.

As described above, also in the power generation device 50 of the electronic wristwatch, the radial portion 54 of the first electrode 51 is formed across the circular portion 20 and the semicircular arc portion 21 of the rotating plate 17, thereby enabling the first and second embodiments. Similarly to the above, the electret film 25 formed on the large number of electrode pieces 54a of the first electrode 51 can be relatively moved in a state where it is always opposed to the large number of electrode pieces 56a of the second electrode 52. It is possible to continuously generate power in accordance with the rotation of the rotating plate 17 caused by the swing of.

That is, the first electrode 51 has a portion of the radial portion 54 provided on the small-diameter circular portion 20 of the rotating plate 17, and the second electrode 52 has a portion of the radial portion 56 of the rotating plate 17 having a small diameter. Since the first electrode 51 is provided in correspondence with the circular portion 20, the other part of the radial portion 54 of the first electrode 51 is a semicircular arc portion of the rotating plate 17. The second electrode 52 is provided at a position corresponding to the rotational movement trajectory of the first electrode 51 provided on the semicircular arc portion 21 of the rotating plate 17 in the other part of the radial portion 56. Therefore, it is possible to generate electric power in the same manner as in the first embodiment, and thereby it is possible to generate electric power corresponding to the sum of both the first and second embodiments.

(Embodiment 4)
Next, a fourth embodiment of an electronic wristwatch to which the present invention is applied will be described with reference to FIGS. In this case, the same portions as those in the third embodiment shown in FIGS.
In this electronic wristwatch, the first electrode 61 and the second electrode 62 of the power generation device 60 have a configuration slightly different from that of the third embodiment, and the other configuration is the same as that of the third embodiment.

That is, the first electrode 61 is provided on the upper surface of the rotating plate 17 via the insulating film 53 as in the third embodiment. The insulating film 53 is also provided on almost the entire upper surface of the circular portion 20 and the semicircular arc portion 21 of the rotating plate 17. The first electrode 61 provided on the insulating film 53 includes first and second radial portions 63 and 64 that are formed radially from the shaft hole 17 a that is the rotation center portion of the rotating plate 17. As shown in FIG. 18, the first radial portion 63 has a configuration in which a large number of electrode pieces 63a are radially arranged on the insulating film 53 located on the circular portion 20 of the rotating plate 17 at regular intervals.

Further, as shown in FIG. 18, the second radial portion 64 has a large number of electrode pieces 64 a on the insulating film 53 positioned on the semicircular arc portion 21 of the rotating plate 17 and a different interval from the electrode pieces 63 a of the first radial portion 63. The configuration is arranged radially. That is, the second radial portion 64 is formed such that a large number of electrode pieces 64 a are wider than the interval between the electrode pieces 63 a of the first radial portion 63.

The first and second radial portions 63 and 64 are guided to the side of the insulating film 53 in a state where the electrode pieces 63a and 64a are all connected at the inner and outer peripheral ends. The rotating plate 17 is electrically connected. Also in this case, the electret film 25 that is a charge holding body is formed on the electrode pieces 63a and 64a of the first and second radial portions 63 and 64, respectively, as in the third embodiment.

On the other hand, as shown in FIGS. 17 and 19, the second electrode 62 is provided on the lower surface (the front surface in FIG. 19) of the ground plate 15, which is the substrate facing the rotating plate 17, with an insulating film 55 interposed therebetween. Similarly to the third embodiment, the insulating film 55 also corresponds to a position corresponding to the rotational movement locus on which the first electrode 51 of the rotating plate 17 rotates, that is, a position corresponding to the small-diameter circular portion 20 of the rotating plate 17 and the rotation. The first electrode 61 is formed in substantially the same shape over both of the portions corresponding to the rotational movement trajectory of the semicircular arc portion 21 of the plate 17.

The second electrode 52 provided on the lower surface of the insulating film 55 has third and fourth radial portions 65 formed radially from the fixed shaft 18 which is the rotation center portion of the rotating plate 17 as in the third embodiment. , 66. That is, the third radial portion 65 is provided in a circular shape corresponding to the first radial portion 63 of the first electrode 61, and the fourth radial portion 66 is a rotation of the second radial portion 64 of the first electrode 61. It is provided in a semicircular arc shape with an angle range of about 90 ° at a location corresponding to the movement locus.

In this case, as shown in FIG. 19, in the third radial portion 65, a number of electrode pieces 65 a are the same as the electrode pieces 63 a of the first radial portion 63 of the first electrode 61 on the insulating film 55 provided on the ground plane 15. The structure is arranged radially at intervals. Further, as shown in FIG. 19, the fourth radial portion 66 has a large number of electrode pieces 66 a on the insulating film 55 provided on the ground plane 15 at the same interval as each electrode 64 a of the second radial portion 64 of the first electrode 61. The configuration is arranged in a radial pattern.

That is, the fourth radial portion 66 is formed such that a large number of electrode pieces 66 a are wider than the interval between the electrode pieces 65 a of the third radial portion 65. These many electrode pieces 65a and 66a are exposed on the upper surface side of the insulating film 55 in a state where all of the inner and outer peripheral ends are connected, and the exposed portions are coiled as shown in FIG. The circuit board 9 is electrically connected by a connection member 29 such as a spring.

As a result, when the rotating plate 17 rotates and the first electrode 61 provided on the rotating plate 17 rotates relative to the second electrode 62 provided on the ground plate 15, The electret film 25 formed on each of the electrode pieces 63a and 64a of the first and second radial portions 63 and 64 of the one electrode 61 is replaced by the third and fourth radial portions 65 and 66 of the second electrode 62. The plurality of electret films 25 of the first and second radial portions 63 and 64 of the first electrode 61 and the second electrode 62 of the second electrode 62 move relative to the respective electrode pieces 65 a and 66 a of the first electrode 61. 3. It is configured to generate electric power by changing the amount of induced charge between the large number of electrode pieces 65a and 66a of the third and fourth radial portions 65 and 66.

As described above, also in the power generation device 60 of the electronic wristwatch, the first and second radial portions 63 and 64 of the first electrode 61 are formed by the circular portion 20 and the semicircular arc portion 21 of the rotating plate 17 as in the third embodiment. The electret film 25 formed on the multiple electrode pieces 63a and 64a of the first and second radial portions 63 and 64 of the first electrode 51 and the second electrode 62 The plurality of electrode pieces 65a and 66a of the third and fourth radial portions 65 and 66 can be relatively moved, and according to the rotation of the rotating plate 17 due to the swing of the arm, as in the third embodiment. Power can be generated continuously.

That is, the first electrode 61 has a first radial portion 63 provided in the small-diameter circular portion 20 of the rotary plate 17, and the second electrode 62 has a third radial portion 65 in the small-diameter circular shape of the rotary plate 17. Since it is provided corresponding to the portion 20, it is possible to generate power in the same manner as in the second embodiment, and the first electrode 61 has the second radial portion 64 provided on the semicircular arc portion 21 of the rotating plate 17. The second electrode 62 is provided at a location corresponding to the rotational movement locus of the second radial portion 64 of the first electrode 61, the fourth radial portion 66 of which is provided in the semicircular arc portion 21 of the rotating plate 17. Therefore, it is possible to generate electric power in the same manner as in the first embodiment, and thereby it is possible to generate electric power corresponding to the sum of the first and second embodiments.

In this case, the interval between the multiple electrode pieces 63a in the first radial portion 63 of the first electrode 61 and the interval between the multiple electrode pieces 65a in the third radial portion 65 of the second electrode 62 correspond to the same interval. Therefore, it is possible to generate power at a predetermined frequency, and the distance between the multiple electrode pieces 64a in the second radial portion 64 of the first electrode 61 and the multiple electrode pieces in the fourth radial portion 66 of the second electrode 62. Since the interval 66a is the same interval and is different from the interval between the electrode pieces 63a and 65a of the first and third radial portions 63 and 65, the first and third radial portions 63 and 65, respectively. It is possible to generate power at a frequency different from the frequency generated at

(Embodiment 5)
Next, with reference to FIGS. 20 to 24, a fifth embodiment of an electronic wristwatch to which the present invention is applied will be described. In this case, the same parts as those in the first embodiment shown in FIGS.
The electronic wristwatch has a configuration different from that of the first embodiment in the power generation device 70, and the other configuration is the same as that in the first embodiment.

That is, as shown in FIGS. 20 and 22, the power generation device 70 has a configuration in which the first electrode 71 is provided on the lower surface of the rotating plate 17 and the second electrode 72 is provided on the upper surface of the back cover 5 facing the first electrode 71. It has become. In this case, as shown in FIGS. 22 and 23, the first electrode 71 is provided on the lower surface of the rotating plate 17 via the insulating film 23. As in the first embodiment, the insulating film 23 is provided in a semicircular arc shape over almost the entire lower surface of the semicircular arc portion 21 of the rotating plate 17.

The first electrode 71 provided on the insulating film 23 includes a radial portion 73 formed radially from the shaft hole 17 a that is the rotation center portion of the rotating plate 17. As shown in FIG. 23, the radial portion 73 has a configuration in which a large number of electrode pieces 73a are radially arranged on the insulating film 23 provided on the semicircular arc portion 21 of the rotating plate 17 at regular intervals. That is, in the radial portion 73, a large number of electrode pieces 73a are elongated in the radial direction with a substantially constant width, and the electrode pieces 73a adjacent to each other are arranged with a gap of a constant interval.

Further, as in the first embodiment, the radial portion 73 is guided to the side of the insulating film 23 in a state where a large number of electrode pieces 73a are all connected at the inner peripheral end and the outer peripheral end thereof. Electrically connected. As a result, the first electrode 73 is electrically connected to the circuit board 9 via the rotating plate 17 and the fixed shaft 18. Also in this case, as shown in FIG. 23, the electret film 25 which is a charge holding body is formed on each electrode piece 73a. The electret film 25 is made of the same material as that in the first embodiment.

On the other hand, a second electrode 72 is provided on the upper surface of the back cover 5, which is a substrate facing the rotating plate 17, with an insulating film 27 interposed therebetween as shown in FIGS. 20, 22 and 24. As shown in FIG. 24, the insulating film 27 is provided in a semicircular arc shape having substantially the same size as that of the first electrode 71 at a position corresponding to the movement locus on which the first electrode 71 of the rotating plate 17 rotates. ing. Similar to the first embodiment, the second electrode 72 provided on the upper surface of the insulating film 27 is made of a conductive metal, and radiates from the center corresponding to the fixed shaft 18 that is the rotation center of the rotating plate 17. A formed radial portion 74 is provided.

As shown in FIG. 24, the radial portion 74 has a configuration in which a large number of electrode pieces 74 a are radially arranged at a predetermined interval on the insulating film 27 provided on the back cover 5. That is, in the radial portion 74, like the radial portion 73 of the first electrode 71, a large number of electrode pieces 74 a are formed elongated in the radial direction with a substantially constant width, and the electrode pieces 74 a adjacent to each other are formed. They are arranged with gaps at regular intervals. The radial portion 74 is guided to the side of the insulating film 27 and electrically connected to the back cover 5 in a state where a large number of electrode pieces 74a are all connected at the inner peripheral end and the outer peripheral end. Yes. In this case, the back cover 5 is electrically connected to the circuit board 9 by a connecting member (not shown) such as a lead wire.

Thus, in the power generation device 70, when the rotating plate 17 rotates and the first electrode 71 provided on the rotating plate 17 rotates relative to the second electrode 72 provided on the back cover 5, The electret film 25 formed on the large number of electrode pieces 73a of the first electrode 71 and the large number of electrode pieces 74a of the second electrode 72 move relatively, and the large number of electret films 25 of the first electrode 71 and the The amount of induced charge between the two electrodes 72 and a large number of electrode pieces 74 a is changed to generate power and store it in the storage battery 34.

According to such a power generator 70 for an electronic wristwatch, the back cover 5 that is a flat substrate provided on the lower surface of the watch case 1, the rotating plate 17 that rotates on the plane of the back cover 5, and this rotation Formed on the back cover 5 so as to face the radial portion 73 of the first electrode 71 provided with a radial portion 73 radially formed on the plate 17 from the shaft hole 17a which is the rotation center portion thereof. Since the second electrode 72 provided with the radial portion 74 and the electret film 25 which is a charge holding body formed on the first electrode 71 are provided, as in the first embodiment, the entire apparatus has a simple structure. Can be reduced in size and power can be generated efficiently.

That is, according to this power generation device 70, the rotating plate 17 is configured to rotate on the flat surface of the flat cover 5 by external vibration. The electret film 25 as a charge holding body is formed on the first electrode 71 provided on the rotating plate 17, and the electret film 25 of the first electrode 71 and the back cover 5 are provided. Since the second electrode 72 is relatively rotated, the rotational movement of the rotating plate 17 can be efficiently converted into electric energy. Therefore, the structure is simple, the entire apparatus can be reduced in size, and power can be generated efficiently.

  In this case, the radial portion 73 of the first electrode 71 is formed in a substantially semicircular arc shape on the semicircular arc portion 21 of the rotating plate 17, and the radial portion 74 of the second electrode 72 is formed on the back cover 5 on the first electrode 71. The rotary plate 17 does not necessarily make one rotation (rotation of 360 ° angle), and responds to the inertial force caused by the swing of the arm. When swinging in an angle (for example, 180 °) range, the electret film 25 formed on the multiple electrode pieces 73a of the first electrode 71 is always opposed to some of the multiple electrode pieces 74a of the second electrode 72. Since it can be moved relatively in the state of being made, it can generate electric power continuously.

Further, when the rotating plate 17 is continuously rotated according to the inertial force due to the swing of the arm, the radial portion 73 of the first electrode 71 is formed in a semicircular arc shape on the semicircular arc portion 21 of the rotating plate 17. When the rotary plate 17 rotates because the radial portion 74 of the second electrode 72 is formed in the back cover 5 in the same shape as the radial portion 73 of the first electrode 71 in a semicircular arc shape having the same size. In addition, power generation is interrupted only when the first electrode 71 is located on the opposite side of the second electrode 72 and does not face the second electrode 72 at all. However, in other cases, the first electrode 71 is connected to the second electrode 72. Because it faces a part of the power generation, it is possible to generate power almost continuously.

In the fifth embodiment described above, the radial portion 74 of the second electrode 72 provided on the upper surface of the back cover 5 is formed in a semicircular arc shape having the same shape and the same size as the radial portion 73 of the first electrode 71. Although the case has been described, the present invention is not limited thereto. For example, as in the modification shown in FIG. 25, the radial portion 77 of the second electrode 76 provided on the upper surface of the back cover 5 is rotated. You may make it the structure formed in the circular ring shape corresponding on a movement locus | trajectory. If comprised in this way, since the 1st electrode 71 of the rotating plate 17 always rotates corresponding to the 2nd electrode 76, it can generate electric power continuously, no matter how the rotating plate 17 rotates. The power generation can be stabilized according to the rotation speed.

Moreover, although Embodiment 1-5 mentioned above and its modification described the case where the rotating plate 17 was the structure provided with the small diameter circular part 20 and the large diameter semicircular arc part 21, it is not restricted to this, For example, as in the modification shown in FIG. 26, the rotary plate 80 may be formed in a circular disc shape, and the weight portion 81 may be provided in a semicircular arc shape on the outer peripheral edge thereof. If comprised in this way, since the 1st electrode 82 can be continuously formed in the circular ring shape on the rotating plate 80, the 1st electrode 82 of the rotating plate 80 is always 2nd electrode like the modification mentioned above. 26, 42, 52, 62, and 76, so that the power can be continuously generated regardless of how the rotating plate 80 rotates, and power generation can be performed according to the rotational speed. It can be stabilized.

Moreover, although Embodiment 1-5 mentioned above and each modification example described the case where the electret film | membrane 25 was provided in 1st electrode 22,41,51,61,71,82, 1st electrode 22,41 was not necessarily mentioned. , 51, 61, 71, 82 need not be provided with the electret film 25, but instead of the first electrodes 22, 41, 51, 61, 71, 82, the electret films are applied to the second electrodes 26, 42, 52, 62, 76. 25 may be provided. Even if comprised in this way, there exists an effect similar to Embodiment 1-5 and each modification.

In addition, in the above-described first to fifth embodiments and the modifications thereof, the case where the present invention is applied to an electronic wristwatch has been described. However, the wristwatch is not necessarily a wristwatch such as an electronic wristwatch. It can be applied to other electronic devices, and can also be used by being attached to the axle of a traveling vehicle such as an automobile or train.

DESCRIPTION OF SYMBOLS 1 Watch case 5 Back cover 6 Watch module 7 Upper housing 8 Lower housing 9 Circuit board 15 Ground plate 16, 40, 50, 60, 70 Power generation device 17, 80 Rotating plate 18 Fixed shaft 20 Small-diameter circular part 21 Large-diameter semicircular arc Part 21a, 81 Weight part 22, 41, 51, 61, 71, 82 First electrode 23, 27, 43, 45, 53, 55 Insulating film 24, 44, 54, 73 Radial part 24a, 44a, first electrode 54a, 73a Electrode piece 25 Electret film 26, 42, 52, 62, 72 Second electrode 28, 46, 56, 74 Radial part of second electrode 28a, 46a, 56a, 74a Electrode piece 34 Storage battery 63, 64 First electrode The first and second radial portions 63a and 64a of the electrode pieces 65 and 66 The third and fourth radial portions 65a and 66a of the second electrode

Claims (6)

A flat substrate;
A rotating member that rotates on the plane of the substrate;
A first electrode provided with a radiating portion radially formed from the rotation center of the rotating member on the rotating member;
A second electrode provided with a radiation portion formed on the flat substrate so as to face the radiation portion of the first electrode;
A power generation device comprising a charge holding body provided on one of the first electrode and the second electrode.   The rotating member includes a small-diameter circular portion, and a semicircular arc portion formed in a substantially semicircular arc shape having a larger diameter than the circular portion on an outer peripheral portion of the small-diameter circular portion. Item 2. The power generation device according to Item 1.   The power generator according to claim 2, wherein the radiating portion of the first electrode is formed in a substantially semicircular arc shape in the semicircular arc portion of the rotating member.   The power generator according to claim 2, wherein the radiating portion of the first electrode is formed in a circular shape in the small-diameter circular portion of the rotating member.   5. The power generation device according to claim 1, further comprising a power storage unit configured to store electric charges generated by relative rotation between the first electrode and the second electrode. The rotating member is made of a conductive metal, and a rotation center portion of the rotating member is rotatably attached to a conductive shaft member protruding from the substrate by a conductive bearing member.
The power storage unit is provided on a circuit board,
The first electrode and the power storage unit are electrically connected through the circuit board, the shaft member, and the bearing member, respectively, and the second electrode and the power storage unit are connected to the circuit. The power generation device according to claim 5, wherein the power generation device is electrically connected via a board and a connection member that connects the circuit board and the second electrode.

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