JP3232471U - Electrostatic induction converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrostatic induction type converter capable of stabilizing the position of an electret substrate 110 and realizing miniaturization. An electrostatic induction converter is arranged side by side at intervals in the circumferential direction and is spaced apart from each other in the circumferential direction with an electret substrate 110 provided with a plurality of charged electret films 111. Opposing substrate 120 provided facing the electret substrate 110 provided with a plurality of electrode portions 121 arranged side by side, and a rotating shaft 150 rotating in the circumferential direction together with one of the electret substrate 110 and the opposing substrate 120. The electret substrate 110 includes, in addition to the plurality of electret films 111, a first charged additional charge portion 114 extending along the circumferential direction, and the counter substrate 120 is added to the plurality of electrode portions 121. Therefore, the additional electrode portion 1211 in which a second charge having a polarity opposite to that of the first charge extending along the circumferential direction is induced is included. [Selection diagram] FIG. 10

Description

The present invention relates to an electrostatic induction type converter.

Patent Document 1 discloses an electrostatic motor having a mover provided with an electrode made of an electret material and a stator provided with an electrode made of a conductive member. In Patent Document 1, an annular electrode is provided at each of the mover and the stator at positions displaced in the radial direction, and the center of the stator and the center of rotation of the mover are generated by the repulsive force acting between the annular electrodes. The technology for correcting the deviation of the above is disclosed.

Japanese Unexamined Patent Publication No. 2015-126557

In the configuration of Patent Document 1 in which the annular electrode is provided at a position deviated in the radial direction, the mover and the stator become large in the radial direction.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an electrostatic induction type converter capable of stabilizing the position of an electret substrate and realizing miniaturization.

The device disclosed in the present application for solving the above problems has various aspects, and the outline of typical ones of these aspects is as follows.

(1) An electret substrate provided with a plurality of charged electret portions arranged side by side at intervals in the circumferential direction, and a plurality of electrode portions arranged side by side at intervals in the circumferential direction. The electret substrate has a facing substrate provided so as to face the electret substrate, and a rotating shaft that rotates in the circumferential direction together with one of the electret substrate and the facing substrate. The electret substrate has a plurality of electret portions. In addition to the plurality of electrode portions, the opposed substrate includes a first charged additional charge portion extending along the circumferential direction, which is opposite to the first charge extending along the circumferential direction. An electrostatic induction converter comprising an additional electrode portion in which a second charge of polarity is induced.

(2) In (1), the electrostatic induction type converter is provided such that the additional charging portion and the additional electrode portion overlap at least a part in a plan view.

(3) In (1) or (2), the electrostatic induction type converter in which the additional charging portion and the additional electrode portion are annular.

(4) In any one of (1) to (3), an electrostatic induction type in which a first non-charged portion is provided between the plurality of electret portions and the additional charged portion in the electret substrate. converter.

(5) In (4), the electrostatic induction type converter in which a groove, which is the first non-charged portion, is formed on the outer edge of the additionally charged portion in the electret substrate.

(6) In (5), the electrostatic induction type converter in which a groove, which is a second non-charged portion, is formed on the inner edge of the additionally charged portion.

(7) In (6), the electrostatic induction type converter in which the first non-charged portion and the second non-charged portion are annular.

(8) In any one of (1) to (7), the electrostatic induction type converter in which the electret portion and the additional charging portion are both an electret film.

(9) In any of (1) to (8), the additional charging portion is provided inside the plurality of electret portions in the radial direction, and the additional electrode portion is provided from the plurality of electrode portions. An electrostatic induction converter installed inside in the radial direction.

(10) In any of (1) to (9), the plurality of electret portions are provided on the upper surface and the lower surface of the electret substrate, respectively, and the opposed substrate is provided so as to face the upper surface of the electret substrate. An electrostatic induction type converter including a first opposed substrate to be provided and a second opposed substrate provided to face the lower surface of the electret surface.

According to the aspects (1) to (10) of the present invention, it is possible to provide an electrostatic induction type converter capable of stabilizing the position of the electret substrate and realizing miniaturization.

It is a top view which shows the whole structure of the wristwatch which concerns on this embodiment. It is a block diagram which shows the outline of the structure of the wristwatch which concerns on this embodiment. It is sectional drawing which shows the electrostatic induction type converter of this embodiment. It is a perspective view which shows the state which the electret substrate of this embodiment was seen from the one facing substrate side. It is a perspective view which shows the state which the electret substrate of this embodiment was seen from the other facing substrate side. It is a top view which shows one facing substrate of this embodiment. It is a top view which shows the other facing substrate of this embodiment. It is a schematic circuit diagram explaining an example of the operation principle when the electrostatic induction type converter is used as a power generation device. It is a schematic circuit diagram explaining an example of the operating principle when an electrostatic induction type converter is used as an electrostatic motor. It is an enlarged cross-sectional view which shows the part shown by the broken line circle shown in FIG. It is an enlarged cross-sectional view which shows the state that the electret substrate is displaced in the radial direction in the electrostatic induction type converter.

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

[Overview of the overall configuration of wristwatch 1]
First, with reference to FIGS. 1 and 2, an outline of the overall configuration of the wristwatch according to the present embodiment will be described. FIG. 1 is a plan view showing the overall configuration of a wristwatch according to the present embodiment. FIG. 2 is a block diagram showing an outline of the configuration of a wristwatch according to the present embodiment.

As shown in FIG. 1, the wristwatch 1 has an outer case 71 including a body and a back cover, a dial 72 arranged in the outer case 71, and a second hand 2, a minute hand 3, and an hour hand 4 which are pointers indicating the time. Have. The dial 72 is provided with abbreviations 73 and hour letters 74. Further, a crown 18 for the user to perform various operations is arranged on the side surface of the exterior case 71 on the 3 o'clock side.

The design of the wristwatch 1 shown in FIG. 1 is an example. In addition to the ones shown here, for example, the outer case 71 may have a square shape instead of a round shape, or may be provided with buttons of any number and arrangement. Further, in FIG. 1, the pointer has three pointers, the second hand 2, the minute hand 3, and the hour hand 4, but the present invention is not limited to this, and the day of the week, the presence or absence of time zone and daylight saving time, the reception state of radio waves, the remaining battery level, and various types. A guideline (hereinafter, also referred to as a display hand) for displaying the date, a date display, or the like may be added.

Further, as shown in FIG. 2, the watch 1 includes a power generation device 100, which is an electrostatic induction type power generation device, a power supply 220, a control circuit 240, an electrostatic motor drive circuit 50, and an electrostatic induction type drive. The device includes an electrostatic motor 200, an electromagnetic motor drive circuit 60, and an electromagnetic motor 70.

The control circuit 240 is a microcomputer having a built-in memory and the like, and controls the operation of various circuits and the like included in the wristwatch 1 according to a program stored in the memory. The operation of the electrostatic motor drive circuit 50 is controlled by the control circuit 240 to drive the electrostatic motor 200. The electrostatic motor 200 moves the second hand 2 via the train wheel 5. The operation of the electromagnetic motor drive circuit 60 is controlled by the control circuit 240 to drive the electromagnetic motor 70. The electromagnetic motor 70 moves the minute hand 3 and the hour hand 4 via the train wheel 6.

Here, the second hand 2 may be used not only as a time hand indicating a time but also as a display hand. Even when the second hand 2 is used as the display hand, the minute hand 3 and the hour hand 4 function as the time hand. Therefore, it is preferable that the second hand 2 is configured to move through a motor or train wheel different from the minute hand 3 and the hour hand 4 so as not to be interlocked with the minute hand 3 and the hour hand 4. Further, the electrostatic motor 200 is preferable as the motor that moves the pointer so as to continuously flow, and the electromagnetic motor 70 is preferable as the motor that moves the pointer step by step. Therefore, in the present embodiment, as shown in FIG. 2, a configuration is adopted in which the second hand 2 is moved by the electrostatic motor 200 and the minute hand 3 and the hour hand 4 are moved by the electromagnetic motor 70.

The power supply 220 is driven by the electric energy generated in the power generation device 100 and rectified by the rectifier circuits 61 and 62.

Further, as shown in FIG. 2, the power generation device 100 includes an electret substrate 110 and opposed substrates 120 and 130. Further, the electrostatic motor 200 includes an electret substrate 110 and opposed substrates 120 and 130.

In addition to the configurations shown in FIG. 2, the watch 1 includes a constant voltage source that keeps the output voltage from the power supply 220 constant, a booster circuit for driving the electrostatic motor drive circuit 50 at a low voltage, and the like. You may be.

[Electrostatic induction converter]
Next, the electrostatic induction type converter of this embodiment will be described with reference to FIGS. 3 to 7. FIG. 3 is a cross-sectional view showing the electrostatic induction type converter of the present embodiment. FIG. 4 is a perspective view showing a state in which the electret substrate of the present embodiment is viewed from one opposite substrate side. FIG. 5 is a perspective view showing a state in which the electret substrate of the present embodiment is viewed from the other opposite substrate side. FIG. 6 is a plan view showing one of the opposing substrates of the present embodiment. FIG. 7 is a plan view showing the other facing substrate of the present embodiment.

In the following description, the direction indicated by the arrow Z1 shown in FIG. 3 is defined as an upward direction, the direction indicated by the arrow Z2 is defined as a downward direction, the direction indicated by the arrow X1 is defined as a right direction, and the direction indicated by the arrow X2 is defined as a left direction. It should be noted that these directions are defined for convenience of explanation, and do not need to correspond to the directions seen by the user of the wristwatch 1.

The electrostatic induction type converter means a device which converts kinetic energy and electric energy into each other by using electrostatic induction, and is an electrostatic induction type power generation device or an electrostatic induction type drive device. pointing. The principle will be described later, but when an external force is applied to the electrostatic induction type converter and kinetic energy is applied, the energy can be converted into electrical energy and taken out, that is, a power generation device. Further, when electric energy is given to the electrostatic induction type converter, the energy can be taken out as kinetic energy, that is, a driving device. In the present embodiment, the power generation device 100 corresponds to an electrostatic induction type power generation device, and the electrostatic motor 200 corresponds to an electrostatic induction type drive device.

The electrostatic induction converter converts mechanical rotational motion into electrical energy, or extracts electrical energy as mechanical rotational motion. Hereinafter, the basic structure of the power generation device 100 will be described. Since the basic structure of the electrostatic motor 200 is the same, the description thereof will be omitted.

As shown in FIG. 3, the power generation device 100 includes an electret substrate 110, a first opposed substrate 120, a second opposed substrate 130, and a positioning enlarged diameter portion 150c for positioning in the insertion direction. It has a rotating shaft 150 and the like. The electret substrate 110 and the rotating shaft 150 may be made of a conductive member such as metal. The electret substrate 110 is fixed to the rotating shaft 150 by being sandwiched between the support plate 151 and the support plate 152 shown in FIG. 3, and is provided so as to rotate together with the rotating shaft 150. Further, an opening is formed in the central portion of the electret substrate 110, and a rotation transmission member 153 for transmitting a rotational force is provided in the opening. Since the fixed structure of the electret board 110 and the rotating shaft 150 is not limited to that shown in FIG. 3, a detailed description of the fixed structure shown in FIG. 3 will be omitted.

[Electrostatic induction converter: electret board]
As shown in FIGS. 4 and 5, the electret substrate 110 has a plurality of disc portions 114 to which the rotating shaft 150 is attached and a plurality of disc portions 114 that extend radially in the radial direction and are arranged at intervals in the circumferential direction. The stretched portion 115 and the like are included.

As shown in FIG. 4, an electret film (electret portion) 111 is provided on the upper surface of the electret substrate 110, and as shown in FIG. 5, an electret film (electret portion) 112 is also provided on the lower surface of the electret substrate 110. Has been done. The electret films 111 and 112 may be provided at least on the upper surface and the lower surface of the plurality of stretched portions 115 of the electret substrate 110. The electret film 112 is made of a thin film, and their illustration is omitted in FIG.

Here, as the material of the electret film, a material that is easily charged is used, and for example, a material that is charged with a negative charge includes silicon oxide, a fluororesin, and the like. A specific example of such a material is CYTOP (registered trademark), which is a fluororesin manufactured by Asahi Glass Co., Ltd. Further, as the material of the electret film, polymer materials such as polypropylene, polyethylene terephthalate, polyvinyl chloride, polystyrene, polytetrafluoroethylene, polyvinyl dendifluoride, polyvinyl fluoride, and the above-mentioned silicon oxide, silicon nitride, etc. Inorganic materials such as silicon oxide nitride can also be used. The arrangement of the electret films 111 and 112 and the details of their functions will be described later.

The material of the electret substrate 110 may be, for example, a metal plate made of aluminum or the like. Alternatively, the material of the electret substrate 110 may be a plate material containing silicon.

[Electrostatic induction converter: facing substrate]
As shown in FIG. 3, the facing substrate 120 and the facing substrate 130 are arranged so as to sandwich the electret substrate 110 with a predetermined distance from the electret substrate 110 in the direction in which the rotating shaft 150 extends. .. The facing substrate 120 is provided so as to face the upper surface of the electret substrate 110. The facing substrate 130 is provided so as to face the lower surface of the electret substrate 110. The facing substrate 120 and the facing substrate 130 may be, for example, directly or indirectly fixed to the main plate to which various circuits and mechanisms of the wristwatch 1 are assembled. The rotating shaft 150 is not fixed to the facing substrate 120 and the facing substrate 130, and idles with respect to the facing substrate 120 and the facing substrate 130.

As shown in FIG. 6, the facing substrate 120 is provided with a plurality of electrode portions 121 arranged at intervals in the circumferential direction. The facing substrate 120 is formed with an opening 120h into which the rotating shaft 150 is inserted, and the plurality of electrode portions 121 are provided so as to extend outward in the radial direction around the opening 120h.

FIG. 6 shows an example in which a plurality of electrode portions 121 are composed of three electrode groups that are electrically separated from each other, and lead-out wiring 121w extends from each of the three electrode groups. The plurality of electrode portions 121 are provided so as to be electrically separated from the electrode portions 121 adjacent to each other. The arrangement and shape of the electrode portions 121 shown in FIG. 6 is an example, and is not limited to this, and may be arranged at least at intervals in the circumferential direction. In FIG. 6, in order to avoid complicating the drawing, only one electrode portion 121 and one lead-out wiring 121w included in each of the three electrode groups are designated with reference numerals, and the other electrode portions are designated. And the lead-out wiring is shown by omitting the reference numerals. The same applies to the electrode portion 131 and the lead-out wiring 131w shown in FIG. 7.

The facing substrate 130 shown in FIG. 7 has almost the same configuration as the facing substrate 120. That is, the facing substrate 130 is provided with a plurality of electrode portions 131 arranged so as to be spaced apart from each other in the circumferential direction. The facing substrate 130 is formed with an opening 130h into which the rotating shaft 150 is inserted, and the plurality of electrode portions 131 are provided so as to extend outward in the radial direction around the opening 130h.

FIG. 7 shows an example in which a plurality of electrode portions 131 are composed of three electrode groups that are electrically separated from each other, and lead-out wiring 131w extends from each of the three electrode groups. The plurality of electrode portions 131 are provided so as to be electrically separated from the electrode portions 131 adjacent to each other. The arrangement and shape of the electrode portions 131 shown in FIG. 7 is an example, and is not limited to this, and may be arranged at least at intervals in the circumferential direction.

Examples of the material of the opposed substrate 120 include a glass epoxy material and a glass composite material generally used for a printed circuit board. Further, a ceramic base material having excellent hygroscopicity and flatness is even more preferable. Further, the opposed substrate 120 may be a molded circuit component (MID: Molded Interconnect Device) in which the electrode portion 121 is integrally formed. However, the present invention is not limited to this, and the opposed substrate 120 may be, for example, a flexible circuit board (FPC: Flexible Printed Circuits) in which an electrode portion 121 is patterned on the substrate. .. The same applies to the opposed substrate 130.

[Electrostatic induction converter: rotating shaft and bearing mechanism]
As shown in FIG. 3, the rotating shaft 150 has a tenon portion 150a at its upper end and a tenon portion 150b at its lower end. The tenon portions 150a and 150b are portions including end faces in the direction in which the rotating shaft 150 extends, and have a diameter smaller than other portions of the rotating shaft 150.

The tenon portion 150a is supported by the bearing mechanism 11, and the tenon portion 150b is supported by the bearing mechanism 21. The bearing mechanism 11 and the bearing mechanism 21 have a function of adjusting the slidability of the tenon portion 150a and the tenon portion 150b by adjusting the positions of the tenon portion 150a and the tenon portion 150b in the vertical direction. The bearing mechanism 11 and the bearing mechanism 21 may be fixed directly or indirectly to the main plate, for example.

The bearing mechanism 11 has a screw portion 11a, a screw receiving portion 11b, a resin portion 11c, an accommodating portion 11d accommodating the screw receiving portion 11b and the resin portion 11c, a receiving stone 11e, and a hole stone 11f. There is.

The receiving stone 11e is fixed to the lower end of the threaded portion 11a and is in contact with the tip of the tenon portion 150a. The tenon portion 150a is positioned in the vertical direction by the receiving stone 11e. The stone receiving stone 11e is preferably a precious stone that has good slidability with the groove portion 150a and is advantageous for rotational movement and wear. Specifically, the receiving stone 11e may be a ruby or the like.

The hole stone 11f is fitted into an opening formed in the central portion of the accommodating portion 11d and is fixed to the accommodating portion 11d. The hole stone 11f is formed with a through hole into which the groove portion 150a is inserted. The tenon portion 150a is positioned in the radial direction by the hole stone 11f.

The screw portion 11a includes a male screw that meshes with a female screw formed on the screw receiving portion 11b. The screw portion 11a moves in the vertical direction by rotating. As a result, the position of the tenon portion 150a in the vertical direction is adjusted. That is, the position of the tenon portion 150a in the vertical direction is determined by the relative position of the screw portion 11a and the screw receiving portion 11b in the vertical direction.

The bearing mechanism 21 has a screw portion 21a, a screw receiving portion 21b, a resin portion 21c, an accommodating portion 21d accommodating the screw receiving portion 21b and the resin portion 21c, a receiving stone 21e, and a hole stone 21f. There is. Since the configuration and function of the bearing mechanism 21 are the same as those of the bearing mechanism 11 described above, detailed description thereof will be omitted.

[Electrostatic induction converter: operating principle when used as a power generator]
FIG. 8 is a schematic circuit diagram illustrating an example of the operating principle when the electrostatic induction type converter is used as a power generation device. As shown in FIG. 8, the electret film 111 provided on the electret substrate 110 and the electrode portion 121 provided on the opposing substrate 120 are arranged at a predetermined slight distance from each other. Similarly, the electret film 112 provided on the electret substrate 110 and the electrode portion 131 provided on the opposing substrate 130 are arranged at a predetermined slight distance. In FIG. 8, the opposed substrates 120 and 130 are not shown. Further, in the electrode portion 121 and the electrode portion 131 of FIG. 8, only two electrode groups are shown, respectively, in order to avoid complicating the drawings.

As described above, the facing substrate 120 and the facing substrate 130 have a configuration in which the region where the electrode portion exists and the region where the electrode portion does not exist are alternately arranged in the circumferential direction, and the electret substrate 110 has a region where the electret film is provided. The configuration is such that the areas that are not provided are alternately arranged in the circumferential direction.

The electret substrate 110 rotates with the rotation of the rotating shaft 150, and the state in which the electret film 111 and the electrode portion 121 face each other and the state in which they do not face each other are switched, and the state in which the electret film 112 and the electrode portion 131 face each other and the state in which the electrode portion 131 does not face each other The states change. The rotating shaft 150 may have, for example, a pinion gear, and the rotation of the rotary weight 15 may be transmitted via a train wheel (not shown) that meshes with the pinion gear. Then, the rotating shaft 150 and the electret substrate 110 may rotate with the rotation of the rotary weight 15. For example, the rotary weight 15 may be provided so as to rotate with the movement of the user's arm when the user wearing the wristwatch 1 on his / her arm walks or the like.

The electret films 111 and 112 are formed so as to be in a predetermined charged state. In the present embodiment, the electret films 111 and 112 are both charged so as to have a negative charge.

In a state where the electrode portion 121 of the facing substrate 120 faces the electret film 111, a charge having the opposite polarity is accumulated in the electrode portion 121 by being guided by the surface charge of the electret film 111. That is, the positive charge is accumulated in the electrode portion 121. After that, when the electret substrate 110 rotates and the electret film 111 does not face the electrode portion 121, the electric charge induced and accumulated in the electrode portion 121 is swept out, rectified by the rectifier circuit 61, and taken out as electrical energy. Is done.

Similarly, in a state where the electrode portion 131 of the opposing substrate 130 faces the electret film 112, a charge having the opposite polarity is accumulated in the electrode portion 131 by being guided by the surface charge of the electret film 112. That is, in the present embodiment, the positive charge is accumulated in the electrode portion 131. After that, when the electret substrate 110 rotates and the electret film 112 does not face the electrode portion 131, the electric charge induced and accumulated in the electrode portion 131 is swept out, rectified by the rectifier circuit 62, and taken out as electrical energy. Is done.

Note that FIG. 8 shows an example in which the electrode portion 121 and the electrode portion 131 are arranged on the facing substrate 120 and the facing substrate 130 so that the phases in the circumferential direction are different from each other. However, the present invention is not limited to this, and the electrode portion 121 and the electrode portion 131 may be arranged so as to have the same phase in the circumferential direction.

[Electrostatic induction converter: operating principle when used as an electrostatic motor]
FIG. 9 is a schematic circuit diagram illustrating an example of the operating principle when the electrostatic induction type converter is used as the electrostatic motor 200. In the electrode portion 121 and the electrode portion 131 of FIG. 9, only one electrode group is shown in order to avoid complicating the drawings.

Also in this case, the electret substrate 110 and the opposing substrates 120 and 130 are arranged so as to face each other with a predetermined slight interval. Further, as the electret substrate 110 rotates, the state in which the electret film 111 and the electrode portion 121 face each other and the state in which the electret film 111 does not face each other are switched, and the state in which the electret film 112 and the electrode portion 131 face each other and the state in which the electrode portion 131 does not face each other are switched. ..

The electret films 111 and 112 are formed so as to be in a predetermined charged state. In the present embodiment, the electret films 111 and 112 are both charged so as to have a negative charge. Further, the electrode portion 121 and the electrode portion 131 are arranged on the facing substrate 120 and the facing substrate 130 so as to have different phases in the circumferential direction. The control circuit 240 controls the switch 63 included in the electrostatic motor drive circuit 50 so that the reverse charge of the electret films 111 and 112 in the charged state is applied at a predetermined timing.

When a reverse charge in the charged state of the electret films 111 and 112 is applied to either the electrode portion 121 or the electrode portion 131, the electret film 111 or the electret film 112 is subjected to the reverse charge due to the electrostatic force. The electret substrate 110 rotates so as to face the above. When the switch 63 is appropriately switched and the presence / absence of the reverse charge applied to the electrode portion 121 and the electrode portion 131 is alternately switched at the right timing, the electret substrate 110 can be continuously rotated. The rotation shaft 150 rotates as the electret board 110 rotates. As a result, the rotational motion can be taken out in the electrostatic motor 200.

The circuit configuration for using the electrostatic induction converter described above as the power generation device 100 or the electrostatic motor 200 is an example, and other configurations may be adopted.

[Additional charging part and additional electrode part]
Next, the additional electrode portion and the additional charging portion of the present embodiment will be described mainly with reference to FIGS. 4 to 7, 10 and 11. FIG. 10 is an enlarged cross-sectional view showing an enlarged portion of the portion indicated by the broken line circle shown in FIG. 3, and is a diagram showing how the electret substrate is in a stable position. FIG. 11 is an enlarged cross-sectional view showing a state in which the electret substrate is displaced from the stable position. Note that FIG. 11 shows a cross section of the same portion as that of FIG. In the present embodiment, the "stable position" is the position of the electret substrate 110 in a state where the rotating shaft 150 is not shaken.

As described above, the rotary shaft 150 is positioned in the vertical direction and the radial direction by supporting the end portions thereof by the bearing mechanism 11 and the bearing mechanism 21. However, the rotating shaft 150 may swing in the radial direction due to an external impact or the like. If radial runout occurs in the rotating shaft 150, a load is applied to the ends 150a and 150b of the rotating shaft 150 supported by the bearing mechanisms 11 and 21. Further, when the rotating shaft 150 swings in the radial direction, the electret board 110 attached to the rotating shaft 150 also swings in the radial direction. If radial runout occurs in the electret board 110, the power generation efficiency of the power generation device may decrease, or the drive transmission efficiency of the drive device may decrease. Therefore, in the present embodiment, a configuration is adopted in which the positions of the electret substrate 110 and the rotating shaft 150 in the radial direction are stabilized.

Specifically, as shown in FIGS. 4 and 10, by forming an annular outer groove 1114a and an inner groove 1114b on the upper surface of the disk portion 114 of the electret substrate 110, the outer groove 1141a and the inner groove 1141b are formed. The additional charging portion 1141 was formed between the two. Similarly, as shown in FIGS. 5 and 10, an annular outer groove 1142a and an inner groove 1142b are formed on the lower surface of the disk portion 114 of the electret substrate 110 to form an annular outer groove 1142a and an inner groove 1142b between the outer groove 1141a and the inner groove 1142b. The additional charging portion 1142 was formed on the surface.

Here, the processing of the electret substrate 110 will be described. The electret substrate material is provided with an electret film on almost the entire upper and lower surfaces thereof. By performing the charging treatment on the electret film, almost the entire upper surface and the lower surface of the electret substrate material are charged. The outer groove 1141a, the inner groove 1141b, the outer groove 1142a, and the inner groove 1142b are formed by laser machining the charged electret substrate material. The electret film is removed in the region where the outer groove 1141a, the inner groove 1141b, the outer groove 1142a, and the inner groove 1142b are formed. As a result, the outer groove 1141a, the inner groove 1141b, the outer groove 1142a, and the inner groove 1142b become non-charged portions. Here, the outer groove 1141a and the outer groove 1142a provided between the plurality of electret films 111 and 112 and the additional charging portions 1141 and 1142 are the first non-charging portions, and the outer edges of the additional charging portions 1141 and 1142. Is formed in. Further, an inner groove 1141b and an inner groove 1142b, which are second non-charged portions, are formed on the inner edges of the additional charging portions 1141 and 1142 in the circumferential direction.

The annular region between the outer groove 1141a and the inner groove 1141b is the additional charging portion 1141. That is, the additional charging portion 1141 is a portion where the electret film 111 in the charged state remains. In other words, the outer groove 1141a is formed on the outer edge of the additional charging portion 1141, and the inner groove 1141b is formed on the inner edge of the additional charging portion 1141. Similarly, the annular region between the outer groove 1142a and the inner groove 1142b is the additional charging portion 1142. That is, the additional charging portion 1142 is a portion where the electret film 112 in the charged state remains. In other words, the outer groove 1142a is formed on the outer edge of the additional charging portion 1142, and the inner groove 1142b is formed on the inner edge of the additional charging portion 1142. Since the additional charge section 1141 and the additional charge section 1142 are the portions where the negatively charged electret films 111 and 112 remain, the additional charge section 1141 and the additional charge section 1142 also have a negative charge (first charge). It is tinged.

Further, as shown in FIG. 6, an annular additional electrode portion 1211 is provided on the facing substrate 120. Similarly, as shown in FIG. 7, an annular additional electrode portion 1311 is provided on the facing substrate 130.

The additional electrode portion 1211 is provided inside the electrode portion 121 so as to face the additional charging portion 1141 in a state where the electret substrate 110 is in a stable position. By providing the additional electrode portion 1211 so as to face the additional charge portion 1141 to be charged with a negative charge, a positive charge (second charge) having the opposite polarity is induced in the additional electrode portion 1211. Therefore, an attractive force F1 acts between the additional electrode portion 1211 and the additional charge portion 1141.

The additional electrode portion 1311 is provided inside the electrode portion 131 so as to face the additional charging portion 1142 in a state where the electret substrate 110 is in a stable position. Since the additional electrode portion 1311 is provided so as to face the additional charge portion 1142 to be charged with a negative charge, a positive charge (second charge) having the opposite polarity is induced in the additional electrode portion 1311. Therefore, an attractive force F2 acts between the additional electrode portion 1311 and the additional charge portion 1142. The magnitudes of the attractive force F1 and the attractive force F2 are preferably the same.

In FIG. 10, the additional electrode portion 1211 and the additional charging portion 1141 are arranged to face each other, and the attractive force F1 acts between the additional electrode portion 1211 and the additional charging portion 1141, so that the electret substrate 110 is opposed to the substrate 120. It shows that it is receiving a pulling force to the side (upper side).

Further, in FIG. 10, the additional electrode portion 1311 and the additional charge portion 1142 are arranged so as to face each other, and the electret substrate 110 faces the electret substrate 110 due to the attractive force F2 acting between the additional electrode portion 1311 and the additional charge portion 1142. It shows a state of receiving a pulling force on the substrate 130 side (lower side).

As shown in FIG. 10, the attractive forces F1 and F2 act on the electret substrate 110 to maintain the positions where the additional electrode portion 1211 and the additional charge portion 1141 face each other and the additional electrode portion 1311 and the additional charge portion 1142 face each other. Will be done.

If the additional electrode portion and the additional charge portion are provided only on either the upper surface side or the lower surface side of the electret substrate 110, a load is applied to the end portion of the rotating shaft 150 in the direction in which the electret substrate 110 is pulled. .. In the present embodiment, the attractive force F1 acting between the additional electrode portion 1211 and the additional charging portion 1141 and the attractive force F2 acting between the additional electrode portion 1311 and the additional charging portion 1142 are in the direction in which the rotation shaft 150 extends. Since it is balanced, it is possible to prevent a load from being applied to the end of the rotating shaft 150.

FIG. 11 shows a state in which the position of the electret substrate 110 in the radial direction is displaced due to the rotation shaft 150 swinging in the radial direction. In a state where the positional deviation occurs in the radial direction, an attractive force F1 acts between the additional electrode portion 1211 and the additional charging portion 1141 in the direction in which the rotating shaft 150 extends and in the direction in which the rotating shaft 150 is inclined with respect to the radial direction. Similarly, an attractive force F2 acts between the additional electrode portion 1311 and the additional charging portion 1142 in the direction in which the rotating shaft 150 extends and in the direction in which the rotating shaft 150 is inclined with respect to the radial direction.

Since the component force F1cosθ of the attractive force F1 acting in the extending direction of the rotating shaft 150 and the component force F2cosθ of the attractive force F2 acting in the extending direction of the rotating shaft 150 work in opposite directions, they are balanced and cancel each other.

On the other hand, the component force F1sinθ of the attractive force F1 acting in the radial direction and the component force F2sinθ of the attractive force F2 acting in the radial direction work in the same direction, so that they strengthen each other. As a result, the electret substrate 110 is radially (leftward in FIG. 11) so that the additional electrode portion 1211 and the additional charge portion 1141 face each other and the additional electrode portion 1311 and the additional charge portion 1142 face each other. Pulled by. Therefore, the electret substrate 110 returns to the state shown in FIG. 10 even if the position in the radial direction is deviated.

In the present embodiment described above, the position of the electret substrate 110 in the radial direction is stable. As a result, the position of the rotating shaft 150 in the radial direction is stabilized, and the load is suppressed from being applied to the tenons 150a and 150b of the rotating shaft 150. That is, since the tenon 150a rotates while constantly sliding with the hole stone 11f, the side surface of the tenon 150a is worn by the hard hole stone 11f, but the movement in the radial direction is as in the present embodiment. By being regulated, it is possible to increase the wear resistance of the tenon portion 150a. The same applies to the tenon portion 150b. As a result, the durability of the rotating shaft 150 and the train wheel that rotates with the rotation of the rotating shaft 150 can be improved. Further, since the position of the electret board 110 in the radial direction is stable, it is possible to suppress a decrease in power generation efficiency as a power generation device and a decrease in drive transmission efficiency as a drive device. Further, since the additional electrode portion and the additional charge portion are arranged so as to face each other, the electrostatic charge is compared with the configuration in which the additional electrode portion and the additional charge portion are arranged so as to be displaced in the radial direction. It is possible to prevent the inductive converter from becoming larger in the radial direction as a whole.

In addition, in FIG. 11, in order to make the explanation easy to understand, the electret substrate 110 is shown to be displaced in the radial direction, but the electret substrate 110 may be substantially not displaced in the radial direction. That is, the rotating shaft 150 may be one that does not substantially deviate in the radial direction. Even in such a configuration, by adopting the additional electrode portion 1211 and the additional charging portion 1141 of the present embodiment, it is possible to obtain an effect of reducing the load applied to the tenons 150a and 150b of the rotating shaft 150.

[Other]
In FIG. 4, the electret substrate 110 has a disc portion 114 and a plurality of stretched portions 115 extending in the radial direction from the disc portion 114, and an electret portion is an electret on the upper surface and the lower surface of the stretched portion 115. Although an example in which a film is provided is shown, the configuration of the electret substrate 110 is not limited to this. For example, the electret substrate 110 has a disk shape having no stretched portion, and a plurality of electret films extending in the radial direction are provided side by side at intervals on the upper surface and the lower surface of the disk shape. May be good. In this case, the additional electrode portion and the additional charge portion may be provided outside the electret film and the electrode portion in the radial direction. However, since the rotational torque is larger on the outer side in the radial direction, the influence of the attractive force acting between the additional electrode portion and the additional charge portion becomes relatively small. Therefore, as shown in the present embodiment, it is preferable that the additional charge portion and the additional charge portion are provided inside the electret film and the electrode portion.

Further, for example, a plurality of through holes are formed on the electret substrate 110 and the opposing substrates 120 and 130 at predetermined intervals in the circumferential direction and extend in the radial direction, and an electret film or an electrode is formed in a region where the through holes are not formed. It may be configured to arrange the parts.

Further, in the present embodiment, an example in which the additional charging portion 1141 is formed by forming the outer groove 1141a and the inner groove 1141b has been described, but the present invention is not limited to this. For example, the additional charging unit 1141 may be formed by separately providing an annular electret film on a non-charged substrate so as to be separated from a plurality of electret films 111 extending radially. The same applies to the additional charging unit 1142.

Further, in the present embodiment, as described above, the additional charging portion is a portion electrically separated from the electret film, which is an electret portion, by laser processing, and is made of the same material as the electret film. Since such a configuration is adopted, it is not necessary to provide a separate member on the electret substrate 110 as an additional electrode portion for generating an attractive force, and the production is easy. Further, since the electret film that maintains the charged state is used as the additional charge portion and a configuration is adopted in which the charge of the opposite polarity is induced in the additional electrode portion, it is not necessary to positively apply a voltage to generate the charge. Therefore, a complicated wiring structure or the like is unnecessary. However, the additional charging portions 1141 and 1142 are not limited to the electret film, and may be any one in which an attractive force acts between the additional charging portions 1211 and 1311.

Further, in the present embodiment, an example is shown in which the additional charging portion and the additional electrode portion are annular. Since the additional charging portion and the additional electrode portion are annular, the electrostatic force acting in the radial direction can be evenly applied to the electret substrate 110 at any position in the circumferential direction, and the position of the electret substrate 110 is more stable. Will be done. Further, by making the additionally charged portion annular, it is possible to suppress the influence of the eddy current which may be generated. However, the present invention is not limited to this, and the additional charging portion and the additional electrode portion may have a shape extending at least along the circumferential direction. That is, the shape may be such that the annular additional charging portion and the additional electrode portion are partially divided.

Further, the arrangement of the additional electrode portion and the additional charge portion is not limited to the illustrated example, and may be an arrangement in which an attractive force acts. For example, the additional electrode portion and the additional charge portion may be arranged so that at least a part thereof overlaps in a plan view in a state where the electret substrate 110 is in a stable position. That is, in the state where the electret substrate 110 is in the stable position, the position in the radial direction and the width in the radial direction of the additional electrode portion and the additional charge portion do not have to be the same. Further, as long as it is arranged to generate an attractive force, the additional electrode portion and the additional charging portion may not overlap in a plan view in a state where the electret substrate 110 is in a stable position.

Further, in FIGS. 10 and 11, an example is shown in which the groove formed by completely removing the electret film on the electret substrate 110 is used as the non-charged portion, but the attractive force between the additional electrode portion and the additionally charged portion is shown. The electret film may remain thin in the non-charged portion as long as it works.

Further, the electrostatic force acting between the additional electrode portion and the additional charge portion is not limited to the attractive force but may be a repulsive force. That is, the additional electrode portion and the additional charge portion may be charged with the same polarity. In this case, it is preferable that the additional electrode portion and the additional charge portion are arranged so that at least a part of the additional electrode portion and the additional charge portion do not overlap each other in a plan view. Further, in this case, additional charging portions are provided on both the upper surface and the lower surface of the electret substrate 110, and the opposing substrate 120 provided with the additional electrode portion 1211 and the opposing substrate 130 provided with the additional electrode portion 1311 are provided. It should be included. By adopting such a configuration, it is possible to stabilize the position of the electret substrate 110 and prevent a load from being applied to the tenons 150a and 150b of the rotating shaft 150 in the stretching direction (vertical direction). Similarly, since the tenon 150a rotates while constantly sliding with the hole stone 11f, the side surface of the tenon 150a is worn by the hard hole stone 11f, but the movement in the radial direction as in this configuration By being regulated, it is possible to increase the wear resistance of the tenon portion 150a. The same applies to the tenon portion 150b.

In the present embodiment, a wristwatch has been described as an example, but the present embodiment is not limited to this, and a pocket watch or the like may be used. Furthermore, the present invention is not limited to a timepiece, and may be another electronic device. The electronic device may be, for example, a portable device such as a wearable device that can be worn by the user.

Although the embodiment according to the present invention has been described above, the specific configuration shown in this embodiment is shown as an example, and it is not intended to limit the technical scope of the present invention to this. Those skilled in the art may appropriately modify these disclosed embodiments, and it should be understood that the technical scope of the invention disclosed herein also includes such modifications.

1 watch, 2 second hand, 3 minute hand, 4 hour hand, 15 rotary weight, 11,21 bearing mechanism, 50 electrostatic motor drive circuit, 60 electromagnetic motor drive circuit, 61, 62 rectifier circuit, 63 switch, 70 electromagnetic motor, 71 exterior Case, 72 dial, 73 abbreviation, 74 hour character, 100 power generation device, 110 electlet substrate, 111,112 electlet film, 114 disk part, 1141,1142 additional charge part, 1141a, 1142a outer groove, 1141b, 1142b inner groove , 115 Stretched part, 120, 130 Opposing substrate, 121, 131 Electrode part, 1211, 1311 Additional electrode part, 150 rotating shaft, 150a, 150b groove part, 150c positioning enlarged part, 150h shaft hole, 151 support plate, 151h shaft Hole, 152 support plate, 152h shaft hole, 153 rotation transmission member, 153h shaft hole, 200 electrostatic motor, 220 power supply, 240 control circuit.

Claims (10)

An electret board that is arranged side by side at intervals in the circumferential direction and is provided with a plurality of charged electret portions.
An opposed substrate provided to face the electret substrate, provided with a plurality of electrode portions arranged side by side at intervals in the circumferential direction, and an opposed substrate.
A rotating shaft that rotates in the circumferential direction together with one of the electret board and the opposed board,
Have,
The electret substrate includes, in addition to the plurality of electret portions, a first charged additional charge portion extending along the circumferential direction.
The opposed substrate includes, in addition to the plurality of electrode portions, an additional electrode portion in which a second charge having a polarity opposite to that of the first charge extending along the circumferential direction is induced.
Electrostatic induction converter. The additional charging portion and the additional electrode portion are provided so that at least a part thereof overlaps in a plan view.
The electrostatic induction type converter according to claim 1. The additional charging portion and the additional electrode portion are annular.
The electrostatic induction type converter according to claim 1 or 2. In the electret substrate, a first non-charged portion is provided between the plurality of electret portions and the additional charged portion.
The electrostatic induction type converter according to any one of claims 1 to 3. In the electret substrate, a groove, which is the first non-charged portion, is formed on the outer edge of the additionally charged portion.
The electrostatic induction type converter according to claim 4. A groove, which is a second non-charged portion, is formed on the inner edge of the additionally charged portion.
The electrostatic induction type converter according to claim 5. The first non-charged portion and the second non-charged portion are annular.
The electrostatic induction type converter according to claim 6. Both the electret portion and the additional charge portion are electret films.
The electrostatic induction type converter according to any one of claims 1 to 7. The additional charging portion is provided inside the plurality of electret portions in the radial direction.
The additional electrode portion is provided inside the plurality of electrode portions in the radial direction.
The electrostatic induction type converter according to any one of claims 1 to 8. The plurality of electret portions are provided on the upper surface and the lower surface of the electret substrate, respectively.
The opposed substrate includes a first opposed substrate provided to face the upper surface of the electret substrate and a second opposed substrate provided to face the lower surface of the electret surface.
The electrostatic induction type converter according to any one of claims 1 to 9.

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