JP7141324B2 - Fixed structure of rotating shaft and rotating member - Google Patents

Description

The present invention relates to a fixing structure for a rotating shaft and a rotating member.

In recent years, a timepiece equipped with an electrostatic induction converter has been proposed (see, for example, Patent Document 1). The electrostatic induction transducer incorporated in this timepiece includes a rotating rotating member, a fixed opposing substrate, a charged film provided on one of the rotating member and the opposing substrate, and a charged film facing the charged film on the other. and a counter electrode provided.

The rotating member rotates by being connected to an oscillating weight used in an automatic winding mechanism that automatically winds the mainspring by swinging the arm, for example, in a mechanical watch. As the rotating member rotates, relative movement (rotation) occurs between the charged film and the counter electrode, and this relative movement changes the area of the area where the charged film and the counter electrode overlap in plan view. As a result, an alternating current is generated between the charged film and the counter electrode to generate power. The charged film is made of a so-called electret material, that is, a dielectric with a charge, and creates an electric field by itself.

JP 2016-142721 A

Here, in the electrostatic induction converter, the narrower the gap between the charging film and the opposing substrate, the greater the amount of power generation and the driving force of the motor. set at very close intervals. Further, since the gap between the charging film and the opposing substrate is extremely narrow as described above, high flatness is required so that the gap does not change when rotated.

The rotating body is composed of a rotating plate corresponding to the gear and a truly corresponding rotating shaft provided at the center of the rotating plate, similar to the individual gear members that make up the gear train of the clock. . In the case of a gear member, it is generally constructed by press-fitting a stem into a hole formed in the center of the gear.

However, in the rotating body of the electrostatic induction converter, as described above, the rotating plate is required to have a high degree of flatness. Press-fitting of the rotating shaft causes distortion, and the required flatness cannot be secured.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a structure for fixing a rotating plate and a rotating shaft, which can fix the rotating shaft without press-fitting the rotating plate to the rotating plate.

The present invention comprises a rotation restricting member having a hole in which a rotating shaft is fixed and an outer peripheral edge around the axis of the rotating shaft formed in an irregular shape, and an irregular inner peripheral edge engaged with the outer peripheral edge of the rotation restricting member. and two rotating plate pressing plates fixed to the rotating shaft sandwiching the rotating plate from both sides in the axial direction of the rotating shaft. be.

According to the fixing structure of the rotating plate and the rotating shaft according to the present invention, the rotating shaft can be fixed to the rotating plate without being press-fitted.

1 is a cross-sectional view showing part of an electrostatic induction converter including a rotating member fixed in one embodiment of a structure for fixing a rotating body and a rotating shaft according to the present invention; FIG. FIG. 2 is a cross-sectional view showing details of a fixing structure of the rotary member in FIG. 1; FIG. 3 is a plan view showing a rotating plate that constitutes the rotating member of FIG. 2; FIG. 4 is a plan view showing a rotation stopping plate (an example of a rotation restricting member) that constitutes the rotating member. FIG. 4 is a plan view showing two rotating plate holding plates that constitute the rotating member; FIG. 3 is a cross-sectional view corresponding to FIG. 2 showing Modification 1 of the embodiment shown in FIG. 2 ; FIG. 3 is a cross-sectional view corresponding to FIG. 2 showing Modification 2 of the embodiment shown in FIG. 2 ; 7 is a cross-sectional view corresponding to FIG. 6 showing a further modified example 3 of the modified example 1 shown in FIG. 6. FIG. FIG. 8 is a cross-sectional view corresponding to FIG. 7 showing a further modified example 4 of the modified example 2 shown in FIG. 7; It is a top view equivalent to FIG. 3 which shows the modification 5 of embodiment shown in FIG. FIG. 11 is a plan view corresponding to FIG. 10 showing a further modified example 6 of the modified example 5 shown in FIG. 10; FIG. 12 is a cross-sectional view corresponding to FIG. 1 of Modification 6 shown in FIG. 11 ; 11 is a plan view corresponding to FIG. 10 showing another modified example 7 of the modified example 5 shown in FIG. 10. FIG.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the fixing structure of the rotating plate and rotating shaft which concern on this invention is described using drawing.

<Embodiment>
FIG. 1 is a cross-sectional view showing a part of an electrostatic induction converter including a rotating member 100 fixed by one embodiment of a fixing structure for a rotating body and a rotating shaft according to the present invention, and FIG. 2 is a rotating member of FIG. FIG. 3 is a plan view showing the rotating plate 20 constituting the rotating member 100 of FIG. 2; FIG. 5 is a plan view showing two rotary plate holding plates 41 and 42 that constitute the rotary member 100. FIG.

(electrostatic induction converter)
The electrostatic induction converter shown in FIG. 1 is provided inside, for example, a wristwatch. A rotating member 100, a front facing substrate 210 disposed facing the front surface 20a of the rotating plate 20 of the rotating member 100, and a back surface disposed facing the back surface 20b of the rotating plate 20. side opposite substrate 220 and a power control circuit (not shown).

The opposed substrate 210 on the front side and the opposed substrate 220 on the back side are rotated in parallel with the front surface 20a and the back surface 20b of the rotating plate 20, respectively, with an interval of about 30 [μm], for example. It is arranged so as not to contact the plate 20 . The facing substrate 210 on the front side and the facing substrate 220 on the back side are fixed to, for example, the case of the wristwatch or the main plate of the movement and do not move.

As shown in FIGS. 2 and 3, the rotating plate 20 has charging films 22 and 23 formed on the front surface 20a and the back surface 20b, respectively. On the other hand, a counter electrode 212 is formed on the surface of the counter substrate 210 on the front side facing the front surface 20 a of the rotating plate 20 , and the counter electrode 212 is formed on the back surface 20 b of the rotating plate 20 on the counter substrate 220 on the back surface side. A counter electrode 222 is formed on the facing surface.

As the rotating member 100 rotates, relative movement (rotation) occurs between the charging film 22 and the counter electrode 212 and between the charging film 23 and the counter electrode 222. The area of the overlapping region between the charged film 22 and the counter electrode 212 in plan view and the area of the overlapping region between the charged film 23 and the counter electrode 222 in plan view change. As a result, AC currents are generated between the charging film 22 and the counter electrode 212 and between the charging film 23 and the counter electrode 222, respectively, to generate power, and the generated electrical energy is input to a power control circuit (not shown). be.

(Rotating member)
As shown in FIG. 2, the rotating member 100 includes a rotating shaft 10, a rotating plate 20, a rotation stop plate 30, and two rotating plate holding plates 41 and 42. As shown in FIG. The rotating shaft 10 is made of a metal material. The rotating shaft 10 rotates around the axis C by receiving a driving force from the outside.

The rotation stop plate 30 is made of a metal material. As shown in FIGS. 2 and 4, the rotation stop plate 30 has a hole 31b formed in the center (coincident with the axis C) into which the rotating shaft 10 is press-fitted, and an outer peripheral edge 31a around the axis C formed by, for example, a keyhole. formed in the shape of Here, the keyhole shape is an outermost shape formed by at least partially overlapping a circle and a rectangle in plan view.

Note that the shape of the outer peripheral edge 31a of the rotation stop plate 30 is not limited to a keyhole shape, and any shape other than a perfect circle around the axis C may be used. That is, as long as the shape (deformed shape) of the outer peripheral edge 31a differs even partially in the circumferential direction around the axis C from the axis C, various shapes such as a polygon, an ellipse, and a star can be applied. can be done.

Since the rotating shaft 10 is press-fitted into the hole 31b, the rotation stop plate 30 rotates integrally with the rotating shaft 10 without slippage in the press-fitted state. It should be noted that the plate thickness (dimension along the direction of the axis C) of the rotation stop plate 30 is preferably thinner than the plate thickness of the substrate 21 of the rotating plate 20 described later.

As shown in FIGS. 2 and 3, the rotary plate 20 includes a disc-shaped substrate 21 and charged films 22 and 23 formed on both sides (a front surface 21a and a rear surface 21b) of the substrate 21, respectively. have. The front surface 21 a of the substrate 21 corresponds to the front surface 20 a of the rotating plate 20 , and the back surface 21 b of the substrate 21 corresponds to the back surface 20 b of the rotating plate 20 . A charging film 22 is formed on the front surface 21a, and a charging film 23 is formed on the back surface 21b.

The substrate 21 is made of, for example, a metal material, but may be made of a material other than the metal material, such as a resin material. The substrate 21 has a hole 21c formed in the center (aligned with the axis C) with an inner peripheral edge corresponding to the outer peripheral edge 31a of the rotation stop plate 30. As shown in FIG. Specifically, the hole 21 c is formed in a keyhole shape having the same shape as the outer peripheral edge 31 a of the rotation stopping plate 30 and is slightly larger than the outer peripheral edge 31 a of the rotation stopping plate 30 . Therefore, when the rotation stop plate 30 is fitted in the hole 21c, the rotation stop plate 30 is loosely inserted into the hole 21c.

However, even in this loosely inserted state, the anti-rotation plate 30 does not idle with respect to the hole 21c. is caught in the keyhole shape of the hole 21c of the substrate 21, and the substrate 21 rotates around the axis C together with the rotation stop plate 30. As shown in FIG.

The charged films 22 and 23 are made of a so-called electret material, that is, a charged dielectric, and form an electric field by themselves. The charging film 22 and the charging film 23 are different in sign corresponding to the difference in the surface formed on the substrate 21 (the difference in whether it is the front surface 21a or the back surface 21b). , characteristics, shape, quantity, etc. are exactly the same.

As the electret material used as the charging film, a material that is easily charged is used. For example, silicon oxide (SiO ² ), fluororesin material, or the like is used as a negatively charged material. Specifically, as a material that is negatively charged, there is CYTOP (registered trademark), which is a fluororesin material manufactured by Asahi Glass Co., Ltd., and the like.

As electret materials, polymer materials such as polypropylene (PP), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polystyrene (PS), polytetrafluoroethylene (PTFE), polyvinylidene difluoride (PVDF), polyvinyl Fluoride (PVF) and the like can be used, and as inorganic materials, silicon oxide (SiO2) and silicon nitride (SiN) mentioned above can also be used. In addition, a well-known charging film can be used.

As shown in FIG. 3, each of the charged films 22 and 23 is formed in a fan shape, and the fan-shaped charged films 22 and 23 are arranged circumferentially at equal angular intervals around the center (axis C). (For example, 18 in FIG. 3) are provided.

The rotating plate holding plates 41 and 42 are made of a metal material. As shown in FIG. 5, the rotating plate holding plates 41 and 42 have holes 41b and 42b formed in the center (coincident with the axis C) into which the rotating shaft 10 is press-fitted, and the outer peripheral edges 41a and 42a extend from the center. It is a disk-shaped member formed in a perfect circle with a constant distance in the circumferential direction.

As shown in FIG. 2, the rotating shaft 10 is press-fitted into the rotating plate pressing plates 41 and 42 so that the substrate 21 of the rotating plate 20 is sandwiched from both sides of the rotating shaft 10 in the axial direction. In FIG. 2, the stepped portion of the rotating shaft 10 that is in contact with the rotating plate holding plate 41 from above is used in the train wheel mechanism of the wristwatch, which is integrally formed with the shaft portion 11 of the rotating shaft 10. It is Kana 12 of the car. Note that the pinion 12 may not be formed on the rotary shaft 10 .

Although the two rotating plate holding plates 41 and 42 are shown as being identical in FIG. 5, actually, as shown in FIG. are different from each other.

Specifically, as shown in FIG. slightly smaller than However, the two rotary plate pressing plates 41 and 42 may have the same outer diameter and inner diameter, or may differ only in outer diameter or inner diameter.

Both rotating plate holding plates 41 and 42 need only have an outer diameter set larger than the hole 21c of the rotating plate 20 and an inner diameter set to a dimension that allows the shaft portion 11 to be press-fitted. It does not matter whether 41 and 42 are the same.

The rotary member 100 shown in FIG. 2 is inserted into the shaft portion 11 of the rotary shaft 10 from below in the figure so that the rotary plate holding plate 41 is press-fitted into the hole 41b. is arranged in a state of abutting against the lower surface of the kana 12.例文帳に追加Since the shaft portion 11 and the hole 41b are press-fitted, the rotating plate pressing plate 41 rotates around the axis C integrally with the rotating shaft 10. As shown in FIG. Further, since the shaft portion 11 and the hole 41b are press-fitted, the rotating plate holding plate 41 is also fixed in the axial center C direction and does not move.

Below the rotating plate holding plate 41 in the drawing, the shaft portion 11 is inserted into the hole 31 b so as to press fit, and the rotation stop plate 30 is arranged in a state of abutting against the lower surface of the rotating plate holding plate 41 . Since the shaft portion 11 and the hole 31b are press-fitted, the rotation stopping plate 30 rotates around the axis C integrally with the rotating shaft 10. As shown in FIG. Since the rotation stop plate 30 is press-fitted onto the shaft portion 11, it is also fixed in the axial center C direction and does not move.

The outer peripheral edge 31a of the rotation stop plate 30 is fitted into the hole 21c on the radially outer side of the rotation stop plate 30, and the rotation plate 20 is inserted into the shaft portion 11 with the front surface 20a facing upward in the drawing. Then, the front surface 21 a of the substrate 21 is placed in a state of abutting against the rotating plate pressing plate 41 . Since the hole 21c is formed to be larger than the outer peripheral edge 31a of the rotation stop plate 30, the rotation stop plate 30 is not press-fitted, but loosely inserted.

Below the rotation stopping plate 30 and the rotating plate 20 in the figure, the rotating plate holding plate 42 is inserted from below in the figure so that the shaft portion 11 is press-fitted into the hole 42b. is placed in a state of being abutted against the rear surface 21b of the substrate 21 of FIG. Since the shaft portion 11 and the hole 42b are press-fitted, the rotating plate holding plate 42 rotates around the axis C integrally with the rotating shaft 10. As shown in FIG. Further, since the shaft portion 11 and the hole 42b are press-fitted, the rotating plate holding plate 42 is also fixed in the axial center C direction and does not move.

The plate thickness of the rotation stop plate 30 is thinner than the plate thickness of the substrate 21, and the rotation stop plate 30 is fixed in a state of being abutted against the upper rotating plate holding plate 41, so that it is press-fitted from below. The rotating plate holding plate 42 is arranged in a state of contacting only the rear surface 21b of the substrate 21 of the rotating plate 20 without contacting the lower surface of the rotation stop plate 30 .

Although the two rotating plate holding plates 41 and 42 are shown as being identical in FIG. 5, actually, as shown in FIG. are different from each other.

Specifically, as shown in FIG. slightly smaller than However, the two rotary plate pressing plates 41 and 42 may have the same outer diameter and inner diameter, or may differ only in outer diameter or inner diameter.

According to the fixing structure of the rotating plate 20 and the rotating shaft 10 of the embodiment configured as described above, the rotating plate 20 is press-fitted and fixed to the rotating shaft 10 in the axial center C direction. Since it is in a state of being sandwiched between the rotary plate holding plates 41 and 42, the position in the direction of the axis C is fixed.

Further, according to the fixing structure of the rotating plate 20 and the rotating shaft 10 of the present embodiment, the rotating plate 20 is a rotation stopper plate press-fitted to the rotating shaft 10 and fixed in the rotating direction about the axis C. The engagement between the outer peripheral edge 31a of the rotary plate 20 and the hole 21c of the rotary plate 20 virtually integrates the rotary plate 30 and rotates together with the rotary plate 30 .

Therefore, according to the fixing structure of the rotating plate 20 and the rotating shaft 10 of this embodiment, the rotating plate 20 can be fixed to the rotating shaft 10 without press-fitting the rotating shaft 10 into the rotating plate 20 . As a result, the distortion of the rotating plate 20 which may occur when the rotating shaft 10 is press-fitted into the rotating plate 20 does not occur, and the flatness of the front surface 20a and the back surface 20b of the rotating plate 20 can be maintained at a high level.

Therefore, when the rotating member 100 configured by applying the fixing structure of the rotating plate 20 and the rotating shaft 10 of the present embodiment is used in the electrostatic induction converter shown in FIG. The gap between the opposing substrates 210 and 220 can be maintained at a very narrow constant dimension of, for example, several tens [μm] with high accuracy.

This is the first time that an electrostatic induction converter, which must maintain an extremely narrow gap between the rotating plate 20 and the opposing substrates 210 and 220 at a constant size with high accuracy, is mounted in the narrow space of a wristwatch. is realized, and extremely useful effects are exhibited.

In the fixing structure of the rotating plate 20 and the rotating shaft 10 of the present embodiment, since the plate thickness of the rotation stopper plate 30 is thinner than the plate thickness of the substrate 21, the two rotating plate pressing plates 41 and 42 are Only the rotating plate 20 can be sandwiched without sandwiching the plate 30, whereby the rotating plate 20 can be fixed without rattling in the axial center C direction.

The above description is an example in which the two rotary plate holding plates 41 and 42 and the rotation stop plate 30 and the rotary shaft 10 are fixed by press-fitting. The fixation with 10 is not limited to fixation by press fitting, and fixation by adhesion or welding can also be applied.

<Modification 1>
FIG. 6 is a sectional view corresponding to FIG. 2 showing Modification 1 of the embodiment shown in FIG.

In the fixing structure of the rotating plate 20 and the rotating shaft 10 of the above-described embodiment, the rotating plate holding plates 41 and 42 for fixing the rotating plate 20 in the direction of the axis C are separate members independent of other members. However, these rotating plate holding plates 41 and 42 may be formed integrally with other members.

For example, as shown in FIG. 6, the rotation stopping plate 30 and the rotating plate holding plate 42 are integrally formed instead of the rotation stopping plate 30 and the lower rotating plate holding plate 42 in the embodiment shown in FIG. Modification 1, in which the rotation stopper and pressing member 43 are applied, can also exhibit the same effects as the above-described embodiment. Moreover, there is also the effect of reducing the number of component parts.

<Modification 2>
FIG. 7 is a sectional view corresponding to FIG. 2 showing Modification 2 of the embodiment shown in FIG.

Further, as shown in FIG. 7, instead of the rotation stopping plate 30 and the upper rotating plate pressing plate 41 in the embodiment shown in FIG. Modification 2, in which the rotation stopper and pressing member 44 are applied, can also exhibit the same effects as the above-described embodiment. Moreover, there is also the effect of reducing the number of component parts.

<Modification 3>
8 is a cross-sectional view corresponding to FIG. 6 showing a further modified example 3 of the modified example 1 shown in FIG.

Further, as shown in FIG. 8, the outer diameter of the pinion 12 is formed large so that the pinion 12 of the rotating shaft 10 in the modified example 1 shown in FIG. may have a function of pressing the rotating plate 20 . Modification 3 configured in this manner can also exhibit the same effects as the above-described embodiment. Moreover, there is also the effect of further reducing the number of component parts.

<Modification 4>
FIG. 9 is a sectional view corresponding to FIG. 7 showing a further modified example 4 of the modified example 2 shown in FIG.

Further, as shown in FIG. 9, the outer diameter of the pinion 12 is formed large so that the pinion 12 of the rotating shaft 10 in the modified example 1 shown in FIG. It may be configured to exhibit the function of holding down the rotating plate 20 . Modification 4 configured in this way can also exhibit the same effects as the embodiment described above. Moreover, there is also the effect of further reducing the number of component parts.

<Modification 5>
FIG. 10 is a plan view corresponding to FIG. 3 showing Modification 5 of the embodiment shown in FIG.

As shown in FIG. 3, the rotating plate 20 in the embodiment is composed of a disc-shaped substrate 21 and a plurality of fan-shaped charged films 22 and 23 formed around the center at predetermined angular intervals. Only the charging films 22 and 23 are responsible for the power generation operation of the electrostatic induction converter 20 . Therefore, from the viewpoint of power generation operation, portions of the rotating plate 20 where the charging films 22 and 23 are not formed on the substrate 21 may be omitted.

Therefore, as shown in FIG. 10, the substrate 121 (corresponding to the substrate 21 in the embodiment) of the rotating plate 120 (corresponding to the rotating plate 20 in the embodiment) is attached to the charged films 122 and 123 (the charged films 22 and 23 in the embodiment). ) and the central portion (the portion where the hole 121c corresponding to the hole 21c in the embodiment is formed) may be removed. In this case, the fan-shaped portion 125 in which the charging films 22 and 23 are formed is separated from the adjacent fan-shaped portion 125 except for the central portion.

Modification 5 configured in this manner can also exhibit the same effects as the above-described embodiment. Moreover, there is an effect that the substrate 121 is made lighter.

<Modification 6>
11 is a plan view corresponding to FIG. 10 showing a further modified example 6 of the modified example 5 shown in FIG. 10, and FIG. 12 is a sectional view corresponding to FIG. 1 of the modified example 6 shown in FIG.

In the rotary plate 120 of Modification 5, the charged films 122 and 123 are formed only in the fan-shaped portion 125 and not formed in the central portion of the substrate 121. Alternatively, it may be formed over the entire surface of the substrate 121 .

That is, in the rotating plate 120 of Modification 6 shown in FIG. 11, the charged films 122 and 123 are formed not only on the fan-shaped portion 125 but also on the entire surface of the substrate 121 including the central portion of the substrate 121 .

As shown in FIG. 12, the rotating plate 120 having the charged films 122 and 123 formed in the central portion of the substrate 121 is covered with the rotating plate holding plate 41 on the front surface 121a of the substrate 121. The rotating plate holding plate 42 abuts against the charged film 122 and the charged film 123 covering the back surface 121 b of the substrate 121 . As a result, the rotating plate 120 is fixed in a state of being sandwiched in the axial center C direction by the rotating plate pressing plates 41 and 42 .

Modification 6 configured in this manner can also exhibit the same effects as the embodiment described above. Moreover, there is an effect that the substrate 121 is made lighter.

<Modification 7>
13 is a plan view corresponding to FIG. 10 showing another modified example 7 of the modified example 5 shown in FIG.

In the rotating plate 120 in Modifications 5 and 6, the substrate 121 does not exist except for the fan-shaped portions 125 on which the charged films 122 and 123 are formed and the central portion. tip may independently and irregularly vibrate in the vertical direction (in the direction of the axis C).

Therefore, as shown in FIG. 13, in the rotating plate 120 in Modification 7, the outermost peripheral portion 126 of the substrate 121 is left annular so that the ends of the fan-shaped portions 125 on the outer peripheral side are connected to each other. state can be In this case, the fan-shaped portions 125 on which the charging films 22 and 23 are formed have their respective outer peripheral ends separated from the outer peripheral ends of the other adjacent fan-shaped portions 125 and the portion of the substrate 121 remaining in the ring. Since they are connected at 126, it is possible to prevent or suppress independent and irregular swinging of the tips of the fan-shaped portions 125 on the outer peripheral side.

Modification 7 configured in this manner can also exhibit the same effects as the above-described embodiment. Moreover, the rigidity can be increased more than that of the rotating plate 120 of the fifth modification.

<Other Modifications>
In the fixing structure of the rotating plate 20 and the rotating shaft 10 in the above-described embodiment and each modified example, the charging films 22 and 23 are formed on the rotating plate 20 and the opposing electrodes 212 and 222 are formed on the opposing substrates 210 and 220. However, the opposing electrodes 212 and 222 may be formed on the rotating plate 20 and the charging films 22 and 23 may be formed on the opposing substrates 210 and 220 .

Also, the charging film 22 is formed on the front surface 20a of the rotary plate 20, the opposing electrode 222 is formed on the back surface 20b, the opposing electrode 212 is formed on the opposing substrate 210, and the charging film 23 is formed on the opposing substrate 220. Configurations can also be employed. Of course, on the contrary, the counter electrode 212 is formed on the front surface 20a of the rotating plate 20, the charged film 23 is formed on the back surface 20b, the charged film 22 is formed on the counter substrate 210, and the counter substrate 220 is opposed. A configuration in which the electrode 222 is formed can also be adopted.

Instead of forming the charging films 22 and 23 on both surfaces 20a and 20b of the rotating plate 20 and providing the counter electrodes 212 and 222 facing these surfaces 20a and 20b, The charging film 22 may be formed only on the surface (for example, the front surface 20a), and the counter electrode 212 may be formed only on the side facing this surface.

In the embodiment and each modified example described above, the fixing structure between the rotating plate and the rotating shaft is such that the rotating member formed by applying this fixing structure between the rotating plate and the rotating shaft is a part of the electrostatic induction converter. However, the fixing structure of the rotating plate and the rotating shaft according to the present invention is not limited to being applied as a part of the electrostatic induction converter.

That is, in the fixing structure of the rotating plate and the rotating shaft according to the present invention, the rotating shaft can be fixed to the rotating plate without press-fitting the rotating shaft into the rotating plate. never occur. Therefore, it is necessary to use a thin rotating plate that is likely to be distorted by press-fitting, and the present invention is very useful for the rotating plate that requires flatness. The present invention can be applied to

In addition, the fixing structure of the rotating plate and the rotating shaft according to the present invention uses an electrostatic induction converter as a motor so as to rotate the rotating plate 20 by applying a current that switches between positive and negative to the opposing substrates 210 and 220. It can also be applied to things used.

10 Rotating shaft 20 Rotating plate 21 Substrate 30 Rotation stopping plate 31a Outer peripheral edge 31b Holes 41, 42 Rotating plate holding plate 100 Rotating member C Shaft center

Claims (4)

a rotation restricting member having a hole in which a rotating shaft is fixed and having a deformed outer peripheral edge around the axis of the rotating shaft;
a rotating plate having a deformed inner peripheral edge engaged with the outer peripheral edge of the rotation restricting member;
two rotating plate holding plates fixed to the rotating shaft, which sandwich the rotating plate from both sides in the axial direction of the rotating shaft ;
A fixing structure between a rotating plate and a rotating shaft, wherein the inner peripheral edge of the rotating plate is formed larger than the outer peripheral edge of the rotation restricting member, and the rotation restricting member is loosely inserted into the rotating plate. 2. The fixing structure of the rotating plate and the rotating shaft according to claim 1, wherein one of the two rotating plate pressing plates is formed integrally with the rotation restricting member. 3. A fixing structure for a rotating plate and a rotating shaft according to claim 1, wherein one of the two rotating plate pressing plates is formed integrally with the rotating shaft. A substrate arranged to face at least one surface of the rotating plate,
a charging film is formed on one of the surfaces of the rotating plate and the substrate facing each other, and a counter electrode is formed on the other;
4. Electrostatic induction conversion is performed between the charged film and the counter electrode by rotating the rotary plate with respect to the substrate about the rotary shaft. 2. A fixing structure between the rotating plate and the rotating shaft according to 1.

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