JPH1152075A - Actuator and timepiece thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an actuator capable of obtaining a plurality of output with small number of parts and a timepiece thereof. SOLUTION: In an actuator 10, a certain frequency signal is impressed to a piezoelectric element 21 formed on a vibration plate 12 so that the vibration plate 12 bends and vibrates in outward direction of the plate with a specific frequency and one end 125 as a movable end repeatedly displaces in the inner direction of the plate. If a signal of different frequency is impressed to the piezoelectric element 21 to have the vibration plate 12 bend and vibrate in different frequency, the other end 126 as movable end repeats displacement in the inner direction. These displacements is amplified and output from the ends 125 and 126 of the vibration plate 12, a lever 32A where base end sides 321A and 322B are connected to fastening parts 31A and 31B capable of elastically distorting and the free ends 322A and 322 of 32A, which drives a servant member 500.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator of the type using a vibrating body and a timepiece using the same. More specifically, the present invention relates to a vibration output system for outputting vibration of a diaphragm.

[0002]

2. Description of the Related Art In a wristwatch or the like, a calendar display mechanism for displaying the day, day of the week, etc., intermittently transmits the rotational driving force of a stepping motor to a date wheel and the like via a wheel train for hand operation and sends it. It is common to drive.

[0003]

However, in order to reduce the thickness of the timepiece, it is necessary to reduce the thickness of the mechanism for feeding the calendar. However, such a conventional mechanism cannot reduce the thickness. .

Therefore, it is conceivable to employ an actuator which has not been used in a conventional calendar display mechanism, such as an actuator using a piezoelectric element which has recently been used for a shutter of a camera, an ink jet head of a printer, or the like. However, in the calendar display mechanism, it is necessary to perform a different feed operation such as fast forward or reverse feed in addition to the normal feed operation in one date indicator, and providing an actuator for each such operation requires space. It is impossible. On the other hand, if the above operations are performed by converting and transmitting the output of one actuator by a wheel train, there is no size advantage compared to a conventional calendar display mechanism.

It is an object of the present invention to provide an actuator capable of obtaining a plurality of outputs with a small number of parts and a timepiece using the same.

[0006]

In order to solve the above-mentioned problems, in an actuator according to the present invention, a vibrating body, excitation means for causing the vibrating body to vibrate, and an exciter connected to the vibrating body, It has at least two vibration output systems for amplifying and outputting vibration, and each vibration system including the vibrating body and each vibration output system has a different resonance frequency, and the excitation unit is provided with respect to the vibrating body. In this case, vibrations corresponding to the resonance frequencies of the respective vibration systems are performed.

In the present invention, since two or more vibration output systems constituting vibration systems having different resonance frequencies are formed for one vibration body, the excitation means vibrates the vibration body at any frequency. Thus, it is possible to select from which of the plurality of vibration output systems the output is obtained. Therefore, two or more operations can be performed by one actuator only by configuring a plurality of vibration output systems to obtain different outputs from each other. Moreover, since the plurality of vibration output systems share the vibrator and the excitation means, the number of parts constituting the actuator can be reduced. Therefore, the cost and size of the actuator can be reduced.

In the present invention, the vibrating body comprises a vibrating plate whose one end is a fixed end and whose other end is displaced in an in-plane direction by a vibration frequency when performing out-of-plane bending vibration. It is preferable that the displacement of the movable end in the in-plane direction is output from each of the vibration output systems as vibration in the in-plane direction.

In such a configuration, when the excitation means drives the diaphragm, the diaphragm bends and vibrates in an out-of-plane direction.
At least one end thereof is displaced in the in-plane direction as a movable end. Here, a vibration output system is connected to the movable end, and this vibration output system amplifies the displacement of the movable end in the in-plane direction and outputs it as in-plane vibration. Therefore, the actuator of the present invention is a new type of actuator that takes out bending vibrations in the out-of-plane direction of the diaphragm as vibrations in the in-plane direction. It can be configured in a space of the thickness dimension to be performed.

In the present invention, the exciting means includes:
It is possible to use one having a piezoelectric element formed on at least one surface of the vibration plate and a drive circuit for the piezoelectric element. Here, any type of bimorph or unimorph piezoelectric element can be used. With this configuration, even if the piezoelectric element is made thin, the strength can be maintained and the capacity can be easily increased, so that electric energy can be easily input. Further, since it is only necessary to laminate the piezoelectric element on the diaphragm, it is suitable for reducing the thickness of the actuator.

In the present invention, the excitation means includes:
It is also possible to use a device provided with a magnetic body formed on the diaphragm, an electromagnetic magnet facing the magnetic body, and a drive circuit for the electromagnetic magnet.

In the present invention, each of the above-mentioned vibration output systems includes:
The diaphragm can be constituted by an elastic portion that holds an end portion of the diaphragm, and a lever whose base end is connected to the elastic portion and the end, and whose distal end is a free end. With this configuration, the resonance frequency is reduced because the lever is also included in the vibration system. Therefore, the current consumption of the drive circuit can be reduced. Further, even when the date dial (driven member) is moved directly in a calendar mechanism of a wristwatch, which will be described later, a speed reduction mechanism is not required. Therefore, this point is also suitable for mounting on a thin device such as a wristwatch.

In this case, it is preferable that the elastic portion is configured as a constricted portion of a plate-like member arranged in a plane with respect to the diaphragm. In addition, it is preferable to use a plate-like lever that is disposed in a plane with respect to the diaphragm as the lever.

In the present invention, each of the above-mentioned vibration output systems includes:
Each lever may drive the same driven member in different directions, or may drive the same driven members in the same direction.

Since the actuator according to the present invention is suitable for thinning, it is suitable for use as a driving device of a calendar display mechanism of a wristwatch. When the actuator according to the present invention is used for such an application, the calendar display mechanism uses a ring-shaped calendar display wheel that rotates by receiving vibration from the vibration output system at an inner peripheral edge or an outer peripheral edge. I just need. On the inner or outer peripheral edge of the calendar display wheel, during a period in which the actuator is inactive, when one of the levers of each of the vibration output systems is located within the notch, another lever is provided. It is preferable to configure a plurality of notches outside the notch. With this configuration, one of the levers is always located in the notch, and the lever located in the notch functions as a stopper. Therefore, it is possible to prevent a problem that the calendar display vehicle is erroneously rotated due to disturbance.

[0016]

Embodiments of the present invention will be described with reference to the drawings.

[Embodiment 1] FIGS. 1A and 1B each show an actuator 1 according to Embodiment 1 of the present invention.
0 is a plan view and a sectional view.

The actuator 10 shown in these figures is
Generally, two plates 11A and 11B each having a thickness of about 0.5 mm and screwed and fixed to a base (not shown) on which the plates 11A and 11B are mounted, respectively.
1B, both ends of each plate 11 are arranged so that bending vibration in an out-of-plane direction as shown by arrow A is possible.
A vibration plate 12 (vibration body) having a thickness of about 0.05 mm supported by A and 11B and an excitation unit 20 for causing the vibration plate 12 to perform bending vibration are configured.

The diaphragm 12 has a thickness of 0.2 mm on the upper surface side.
And a first diaphragm side connected at one end 125 through a first narrow portion 121 at both ends of the rectangular portion 120 on which the unimorph type piezoelectric element 21 is formed. A connecting portion 123 and a second diaphragm-side connecting portion 124 connected at the other end 126 via the second narrow portion 122 are formed.

The excitation means 20 comprises a unimorph type piezoelectric element 21 formed on the upper surface side of the vibration plate 12 and a drive for applying a driving signal between the piezoelectric element 21 and the vibration plate 12 with both poles as both poles. Circuit 22 (FIG. 1B)
See ).

As shown in FIG. 2A, the driving circuit 22 converts the signal output from the oscillation circuit 221 into a driving signal having a frequency corresponding to the resonance frequency of the vibration system by a frequency conversion circuit 222. A separately excited circuit applied to the
As shown in FIG. 2B, a filter 224 of a variable frequency and a switching circuit 225 of the frequency are provided for the Colwitz oscillation circuit 223, and only a signal of a predetermined frequency is fed back by the switching circuit 225. Alternatively, a self-excited circuit that applies a drive signal having a frequency corresponding to the resonance frequency of the vibration system to the piezoelectric element 21 can be used.

In the present embodiment, as will be described below, the first and second vibration output systems are formed for one vibration plate, and the vibration to which the first and second vibration output systems belong. The system has different resonance frequencies. Therefore, in this embodiment,
In the driving circuit 22 shown in FIG.
2 and the setting of the filter 224 via the switching circuit 225 in the drive circuit 22 shown in FIG.
From the piezoelectric element 21.

Referring again to FIGS. 1A and 1B, in the actuator 10 of the present embodiment, the two plates 11 are used.
The first and second vibration output systems 30A and 30B that amplify and output bending vibrations of the diaphragm 12 in the out-of-plane direction as in-plane vibrations by using A and 11B are configured. That is, in the first and second vibration output systems 30A and 30B, the plates 11A and 11B support the diaphragm 12 so that both ends 125 and 126 operate as movable ends, respectively. , 126 include first and second levers 32A, 32B that output displacements of the movable ends in the in-plane direction as in-plane vibrations when the diaphragm 12 performs out-of-plane bending vibration. Are linked. In this configuration, the first
The plate 11A has a portion 118A screwed to the base and one end 1 of the diaphragm 12 from this portion.
25, a first lever 3 extending to the opposite side of the diaphragm 12 through a lower side of the first diaphragm side connection portion 123 formed on the first diaphragm 3.
2A. The second plate 11B is
The first plate 11A is arranged substantially symmetrically with respect to the first plate 11A with respect to the diaphragm 12, but similarly to the first plate 11A, a portion 118B screwed to the base and a diaphragm 118 And a second lever 32B extending under the second diaphragm-side connecting portion 124 formed at the other end 126 of the second diaphragm 126 and extending to the opposite side of the diaphragm 12. Here, the first and second diaphragm side connection portions 123 and 124 of the diaphragm 12 are joined to the base ends 321A and 321B of the first and second levers 32A and 32B.

Also, the first and second plates 11A,
11B, the first and second levers 3
Since the first and second constricted portions 31A and 31B (elastic portions) are respectively formed at the bases of the main portions 118A and 118B and the base portions 2A and 32B, the first and second constricted portions 31A and 31B are formed. A little more on the tip side,
The first and second diaphragm-side connection portions 123 of the diaphragm 12,
124 is in a state in which the proximal ends 321A and 321B of the first and second levers 32A and 32B are joined. Therefore, the first and second levers 32 are provided on the proximal side 321A, on the sides of the first and second constricted portions 31A and 31B, which are close to each other, and on the sides of the ends 125 and 126 of the diaphragm 12, respectively.
321B are connected to each other, and the free end 3
The structure extends as 22A and 322B.

Such first and second levers 32
In this embodiment, when the diaphragm 12 bends and vibrates in an out-of-plane direction as described later, the displacement of the both ends 125 and 126 in the in-plane direction is amplified by the connection structure between the diaphragms A and 32B and the diaphragm 12. First and second vibration output systems 30A and 30B that output from the free ends 322A and 322B of the first and second levers 32A and 32B as in-plane vibrations are configured.

In the actuator 10 configured as described above, since the first lever 32A is long and the second lever 32B is short, the mass of the first lever 32A is larger than that of the second lever 32B. Therefore, the first vibration system 300A including the vibration plate 12 and the first vibration output system 30A and the second vibration system 300B including the vibration plate 12 and the second vibration output system 30B have the first vibration system. The resonance frequency of the vibration system 300A is lower than the resonance frequency of the second vibration system 300B.

The drive circuit 22 constituting the excitation means 20 outputs a drive signal corresponding to the resonance frequency of the first vibration system 300A and a drive signal corresponding to the resonance frequency of the second vibration system 300B, respectively. I do. Therefore, when the drive circuit 22 applies a drive signal corresponding to the resonance frequency of the first vibration system 300A to the piezoelectric element 21, FIG.
Alternatively, as schematically shown in FIG. 3B, the diaphragm 12 performs bending vibration corresponding to the resonance frequency of the first vibration system 300A, and in this case, the other end 12
6 is a fixed end, and only one end 125 performs a vibration in an in-plane direction as a movable end as shown by an arrow F in FIGS. 3 (A) and 3 (B). As a result, the first lever 32A whose base end 321A is connected to the one end 125 is the first lever 32A.
The free end 322A is supported by the diaphragm 1 with the constricted portion 31A as a fulcrum.
Vibration occurs in the in-plane direction of No. 2 and transmitted to the driven member 500 as indicated by an arrow CA. On the other hand, the drive circuit 22
When a drive signal corresponding to the resonance frequency of the second vibration system 300B is applied to the piezoelectric element 21, the diaphragm 12 is moved to the second position as schematically shown in FIG. 3C or FIG.
In this case, the bending vibration corresponding to the resonance frequency of the vibration system 300B is performed, and at this time, one end 125 of the vibration plate 12 becomes a fixed end, as shown by an arrow F in FIGS. 3C and 3D. , Only the other end 126 performs in-plane vibration as a movable end. As a result, the other end 126 has a proximal end 3
The free end 322B of the second lever 32B to which the second lever 21B is connected vibrates in the in-plane direction of the diaphragm 12 with the second constricted portion 31B as a fulcrum, and transmits the vibration to the driven member 500 as indicated by an arrow CB. I do.

As described above, the actuator 10 of the present embodiment
Since the first and second vibration output systems 30A and 30B having different resonance frequencies are connected to one diaphragm 12, the excitation means 20 causes the diaphragm 12 to vibrate at which frequency. , The first and second vibration output systems 30A and 30B can be selected. Therefore, the first and second vibration output systems 30A, 30A
By simply configuring B so as to obtain different outputs from each other, one actuator 10 can perform two operations. Moreover, the first and second vibration output systems 3
Since the diaphragms 0A and 30B share the diaphragm 12 and the excitation means 20, the number of components constituting the actuator 10 can be reduced. Therefore, the cost and size of the actuator 10 can be reduced.

Also, the actuator 10 of the present embodiment is a new type in which out-of-plane bending vibration of the diaphragm 12 is extracted as in-plane vibration at the free ends 322A and 322B of the first and second levers 32A and 32B. Actuator 10 and can be configured with a small number of components. In addition, since the actuator 10 does not need to arrange members above and below the diaphragm 12, the actuator 10 can be configured in a space having a small thickness in which the diaphragm 12 performs bending vibration in an out-of-plane direction. Can be mounted inside. In the present embodiment, the diaphragm 12 has the first
Since the first and second levers 32A and 32B are connected to each other, a vibration system including the first and second levers 32A and 32B is formed, so that the resonance frequency is low. Therefore, the current consumption of the drive circuit 22 can be kept low. Also,
Even when the date dial (the driven member 500) is moved directly in a calendar mechanism of a wristwatch, which will be described later, a speed reduction mechanism is not required.
Further, as the first and second vibration output systems 30A and 30B, plates 11A and 11B (plate-like members) arranged in a plane with respect to the diaphragm 12 are used.
Since the end of the diaphragm 12 can be displaced in the in-plane direction by the first and second constricted portions 31A and 31B of the actuators A and 11B, the thickness of the actuator 10 is reduced because a thick spring or the like is not used. Is suitable for Also, the output of the vibration is plate-like first and second levers 32A, 32A,
Since the operation is performed from 2B (plate-like lever), this point is also suitable for making the actuator 10 thinner. Further, since the unimorph type piezoelectric element 21 formed on the upper surface side of the diaphragm 12 is used as the excitation means 20, the strength can be maintained and the capacity can be increased even if the piezoelectric element 21 is thinned. Is easy, so that electric energy can easily enter. Moreover, it is suitable for reducing the thickness of the actuator 10.

Here, comparing the first lever 32A and the second lever 32B, the operation of the free end 322B of the second lever 32B is high in frequency, but the amplitude is the free end 322A of the first lever 32A. Is larger. Therefore, in this embodiment, as described below, the normal feed operation of the calendar display is performed by the second lever 32B, and the first lever 3B is operated.
Fast forward the calendar display with 2A.

When the actuator 10 of the present embodiment is used as a drive of the calendar display mechanism 50 of a wristwatch, the free ends 3 of the first and second levers 32A and 32B are used.
The actuator 10 is arranged so that each of the wheels 22A and 322B is inscribed in the date dial 51. With this configuration, during normal day feeding, the drive circuit 22
A drive signal corresponding to the resonance frequency of the vibration system 300A is applied to the piezoelectric element 21, and the date dial 51 is rotated in the direction of arrow D by the first lever 32A. On the other hand, when the date indicator 51 is fast-forwarded to correct the date display,
A drive signal corresponding to the resonance frequency of the second vibration system 300B is applied from the drive circuit 22 to the piezoelectric element 21, and the date dial 51 is rapidly moved in the direction of arrow D by the second lever 32B. Thus, in one actuator 10,
If the diaphragm 12 is flexibly vibrated at different frequencies to selectively vibrate the first and second vibration output systems 30A and 30B, even if the train train is not switched by using a complicated switching mechanism, the vibration can be reduced. The rotation speed of the car 51 can be changed.

[Embodiment 2] FIGS. 4A and 4B show an actuator 1 according to Embodiment 2 of the present invention, respectively.
0 is a plan view and a sectional view.

The actuator 10 shown in FIGS.
Generally, a plate 11 having a thickness of about 0.5 mm, which is screwed and fixed at two places to a base (not shown) on which it is mounted, and a plate 11 arranged in a plane with respect to these plates 11, Plate 1 having both ends supported by respective plates 11 so as to be capable of bending vibration in the direction of thickness of about 0.05 mm
And a piezoelectric element 2 for causing the diaphragm 12 to perform bending vibration.
1 and an excitation means 20 comprising a drive circuit 22 are the same as in the first embodiment.

In the actuator 10 of the present embodiment, as in the first embodiment, the vibration plate 12 is supported by using the plate 11 so that both ends 125 and 126 operate as movable ends. Both ends 125, 126
In each of the first and second embodiments, when the diaphragm 12 undergoes out-of-plane bending vibration, the displacement in the in-plane direction of both ends 125 and 126 (each movable end) is amplified as in-plane vibration and output. Two vibration output systems 30A and 30B are configured.

In constructing such a vibration output system, in the present embodiment, the plate 11 extends from both ends of the main body 111 in the same direction and
First and second levers 32A, 32B are formed below the first and second diaphragm-side connection portions 123, 124 formed on the first and second diaphragms 126 and extending to the opposite side of the diaphragm 12, respectively. The free ends 322A and 322B of the first lever 32A and the second lever 32B face each other. Therefore, the first lever 32A and the second lever 32B drive the same driven member 500 in opposite directions.

In the first and second levers 32A and 32B, first and second constrictions 31A and 31B are respectively formed at the bases of the main body 111, and the first and second constrictions 31A are formed. And 31B, the base portions 321A, 321A, 3B passing under the first and second diaphragm-side connecting portions 123, 124 of the diaphragm 12 slightly.
Reference numeral 21 </ b> B is a joint portion with the diaphragm 12. Therefore, the first and second levers 32A and 32B are connected to the first and second constricted portions 31 adjacent to each other and the diaphragm 1
2 and the proximal end 321A, 3
21B are connected to each other, and the leading end side is a free end 32 therefrom.
The structure extends as 2A and 322B.

Such first and second levers 32
In the present embodiment, when the diaphragm 12 bends and vibrates in an out-of-plane direction as described later, the surfaces of the end portions 125 and 126 (movable ends) of the diaphragm 12 are formed by the connection structure between the diaphragms A and 32B and the diaphragm 12. First and second vibration output systems 30A and 30B are configured to amplify the displacement in the inward direction and output the inward vibrations from the free ends 322A and 322B of the first and second levers 32A and 32B. .

In the actuator 10 thus configured, the first lever 32 is longer and the second lever 32 is shorter, so that the first lever 32 has a larger mass than the second lever 32. For this reason, the first vibration system 300A including the vibration plate 12 and the first vibration output system 30A and the vibration plate 12
Vibration system 3 including a second vibration output system 30B
00B, the resonance frequency of the first vibration system 300A is lower than the resonance frequency of the second vibration system 300B.

The drive circuit 2 constituting the excitation means 20
2, a drive signal corresponding to the resonance frequency of the first vibration system 300A and a second vibration system 300B
And a drive signal corresponding to the resonance frequency. Therefore, when the drive circuit 22 applies a drive signal corresponding to the resonance frequency of the first vibration system 300A to the piezoelectric element 21, one end 12
Only 5 performs a vibration in an in-plane direction as a movable end. As a result, the first lever 32A whose base end 321A is connected to the one end 125, the free end 322 vibrates in the in-plane direction of the diaphragm 12 with the first constricted portion 31 as a fulcrum,
This is transmitted to the driven member 500 as shown by the arrow CA. On the other hand, the drive circuit 22 operates in the second vibration system 300
When a drive signal corresponding to the resonance frequency of B is applied to the piezoelectric element 21, only the other end 126 of the diaphragm 12 vibrates in the in-plane direction as a movable end. As a result, the second lever 32A whose base end 321B is connected to the other end 126, the free end 322B vibrates in the in-plane direction of the diaphragm 12 with the second constricted portion 31B as a fulcrum, Arrow CB
As shown by, a force in the opposite direction to the first lever 32A is transmitted to the driven member 500.

The actuator 10 constructed as described above
Is used as a drive of the calendar display mechanism 50 of the wristwatch, as in the first embodiment, both the free ends 322A and 322B of the first and second levers 32A and 32B are inscribed in the date dial 51. Actuator 10
Place. In the state configured as described above, at the time of normal daily feeding, a drive signal corresponding to the resonance frequency of the first vibration system 300A is applied from the drive circuit 22 to the piezoelectric element 21,
The date wheel 51 is rotated in the direction indicated by the arrow DA by the first lever 32A. On the other hand, when the date wheel 51 is reversed in order to correct the date display, a drive signal corresponding to the resonance frequency of the second vibration system 300B is applied from the drive circuit 22 to the piezoelectric element 21, The date wheel 51 is moved backward by the second lever 32B in the direction indicated by the arrow DB. Thus, in one actuator 10, the diaphragm 12
Is flexibly vibrated at different frequencies to selectively vibrate the first and second vibration output systems 30A and 30B, without having to switch the train wheel using a complicated switching mechanism.
You can change the direction and speed of rotation.

Third Embodiment FIGS. 5A and 5B show an actuator 1 according to a third embodiment of the present invention.
0 is a plan view and a sectional view.

The actuator 10 shown in FIGS.
Generally, two plates 11A and 11B each having a thickness of about 0.5 mm and screwed and fixed to a base (not shown) on which the plates 11A and 11B are mounted, respectively.
1B, a diaphragm 12 having a thickness of about 0.05 mm supported at both ends by each of the plates 11A and 11B so as to be capable of bending vibration in an out-of-plane direction. Excitation means 20 including a piezoelectric element 21 for performing bending vibration and a drive circuit 22 is configured. The basic configuration of diaphragm 12 is the same as that of the first embodiment, and a description thereof will be omitted.

In the actuator 10 of this embodiment, similarly to the first embodiment, the bending vibration in the out-of-plane direction of the diaphragm 12 is output as the in-plane vibration using the two plates 11A and 11B. First and second vibration output systems 30
A and 30B have a first feature. In the present embodiment, the first and second vibration output systems 3
The second feature is that one of the two output systems is configured to function as a stopper by alternately operating 0A and 30B.

That is, in the present embodiment, as in the first embodiment, the first and second levers 32A and 32B and the first and second levers 32A and 32B are attached to both the first and second plates 11A and 11B. The first and second constricted portions 31A and 31B are respectively formed at the base portions of the levers 32A and 32B and the main body portions 118A and 118B. Here, the first lever 32 is slightly longer than the second lever 32 because the first lever 32 is slightly longer than the second lever 32. For this reason, the diaphragm 12
And a first vibration system 3 composed of a first vibration output system 30A
Between 00A and the second vibration system 300B including the vibration plate 12 and the second vibration output system 30B, the resonance frequency of the first vibration system 300A is slightly lower than the resonance frequency of the second vibration system 300B. .

The driving circuit 2 constituting the excitation means 20
2, a drive signal corresponding to the resonance frequency of the first vibration system 300A and a second vibration system 300B
And a drive signal corresponding to the resonance frequency. Therefore, when the drive circuit 22 applies a drive signal corresponding to the resonance frequency of the first vibration system 300A to the piezoelectric element 21, one end 12
Only 5 performs a vibration in an in-plane direction as a movable end. As a result, the first lever 32A whose base end 321A is connected to the one end 125, the free end 322 vibrates in the in-plane direction of the diaphragm 12 with the first constricted portion 31 as a fulcrum,
This is transmitted to the driven member 500 as shown by the arrow CA. On the other hand, the drive circuit 22 is connected to the second vibration system 300
When a drive signal corresponding to the resonance frequency of B is applied to the piezoelectric element 21, only the other end 126 of the diaphragm 12 vibrates in the in-plane direction as a movable end. As a result, the second lever 32A whose base end 321B is connected to the other end 126, the free end 322B vibrates in the in-plane direction of the diaphragm 12 with the second constricted portion 31B as a fulcrum, This vibration is transmitted to the driven member 500 as shown by the arrow CB.

The actuator 10 configured as described above
Is used as a driving device of the calendar display mechanism 50 of the wristwatch as in the first embodiment,
The actuator 10 is disposed such that both the free end 322 of the second lever 32 and the free end 322 of the second lever 32 are inscribed in the date indicator 51. However, in the present embodiment, a plurality of notches 512 are formed at predetermined intervals on the inner peripheral edge 511 of the date indicator 51, and during the idle period of the actuator 10, the first and second vibration output systems 30
When one of the levers 32A and 32B is located within the notch 512, the other lever is always outside the notch 512 (a portion corresponding to the mountain portion 513). Therefore, when a drive signal is applied from the drive circuit 22 to the piezoelectric element 21 to perform date feeding, the lever which is outside the notch 512 and strongly contacts the inner peripheral edge 511 of the date wheel 51 is used. The date wheel 51 is rotated by a predetermined angle (one step). In this manner, when the rotation of the date wheel 51 for one step is completed, the lever 32 that has been outside the notch 512 and that has driven the date wheel 51 fits into the notch 512, while the lever 32 that has not moved inside the notch 512 has hitherto. , The lever 32 not involved in driving the date wheel 51 is located outside the notch 512. Thus, during the rest period of the actuator 10, the first and second vibration output systems 30
If one of the levers 32A, 32B of A, 30B is located within the notch 512, this notch 51
The lever in 2 functions as a stopper. Therefore, even if a disturbance such as an impact is applied to the date wheel 51 from outside, the date wheel 5
1 does not rotate carelessly.

[Other Embodiments] In any of the above embodiments, the date indicator 51 of the calendar display mechanism 50 of the wristwatch is rotated by the actuator 10 of the present embodiment. May be rotated. In addition, the actuator 10 to which the present invention is applied not only has a calendar mechanism of a wristwatch, but also has a time,
The present invention can be used as a driving device for a device that displays the moon, year, age, sun position, water depth, atmospheric pressure, temperature, humidity, direction, speed, and the like. Furthermore, it is needless to say that the present invention can be used as a driving device for various devices other than the display device.

In the above embodiment, a unimorph type piezoelectric element 21 is used as the piezoelectric element 21. However, the present invention is not limited to this, and a bimorph type piezoelectric element 21 may be used.

Further, as shown in FIG.
A magnetic body 23 such as a permanent magnet or a movable iron piece formed on the diaphragm 12, an electromagnetic magnet 24 facing the magnetic body 23, and a drive circuit 25 for the electromagnetic magnet 24.
Any excitation means 20 may be used as long as the vibration plate 12 bends and vibrates in an out-of-plane direction, such as one having:

Further, the number of vibration output systems is not limited. For example, as shown in FIG. 7, if a polygonal or circular diaphragm is used, four vibration output systems 30 can be formed.

The actuator according to the present invention is not limited to an application in which the driven member is a ring-shaped calendar display wheel or the like, but may be used as an actuator that reciprocates linearly or an actuator that generates vibration. Is also possible.

[0052]

As described above, in the actuator according to the present invention, since a plurality of vibration output systems constituting vibration systems having different resonance frequencies are provided for one vibrator, the excitation means is not required. Depending on which frequency the vibrating body is vibrated, it is possible to select from which of the plurality of vibration output systems the output is obtained. Therefore, two or more operations can be performed by one actuator only by configuring each vibration output system to obtain a different output from each. In addition, since each vibration output system shares the vibration body and the excitation means, the number of parts constituting the actuator can be reduced. Therefore, the cost and size of the actuator can be reduced.

In the present invention, as the vibrating body, a vibrating plate whose one end is fixed and the other end is displaced in the in-plane direction by vibrating frequency at the time of performing out-of-plane bending vibration is used. When the displacement of the end is output as vibration in the in-plane direction from each vibration output system, it is possible to configure a new type of actuator capable of extracting out-of-plane bending vibration of the diaphragm as in-plane vibration. . Also,
This actuator has the advantages that it can be configured with a small number of components and that the diaphragm can be configured in a space having a thickness dimension that performs bending vibration in an out-of-plane direction.

[Brief description of the drawings]

FIGS. 1A and 1B are a plan view and a cross-sectional view of an actuator according to a first embodiment of the present invention and a case where the actuator is used for driving a date indicator in a calendar display mechanism of a wristwatch, respectively. It is.

FIGS. 2A and 2B are circuit block diagrams each showing an example of a drive circuit for driving an actuator according to the first embodiment of the present invention.

FIGS. 3A to 3D are explanatory views showing bending vibration of a diaphragm in the actuator according to the first embodiment of the present invention.

FIGS. 4A and 4B are a plan view and a cross-sectional view, respectively, of an actuator according to Embodiment 2 of the present invention and a case where the actuator is used for driving a date indicator in a calendar display mechanism of a wristwatch. It is.

FIGS. 5A and 5B are a plan view and a cross-sectional view of an actuator according to Embodiment 3 of the present invention, and a case where the actuator is used for driving a date indicator in a calendar display mechanism of a wristwatch. It is.

FIG. 6 is an explanatory diagram showing an example in which an electromagnetic magnet is used as excitation means of an actuator to which the present invention is applied.

FIG. 7 is an explanatory diagram showing an example in which four vibration output systems are configured in an actuator to which the present invention is applied.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Actuator 11A, 11B Plate 12 Vibrating plate (vibrating body) 20 Exciting means 21 Unimorph type piezoelectric element 22 Drive circuit 30 Vibration output system 30A First vibration output system 30B Second vibration output system 31A, 31B Neck (elasticity) Parts) 32A, 32B lever 50 calendar display mechanism 51 ring-shaped date dial (calendar display wheel / driven member) 121 first narrow part of diaphragm 122 second narrow part of diaphragm 125 one of diaphragms End part 126 The other end part of the diaphragm 321A, 321B The base end side of the lever 322A, 322B The free end of the lever 500 The driven member 511 The inner peripheral edge of the date indicator 512 Notch of the date indicator 300A The first vibration system 300B The second vibration system

Claims (12)

[Claims] 1. A vibrating body, excitation means for causing the vibrating body to vibrate, and at least two vibration output systems connected to the vibrating body for amplifying and outputting vibration of the vibrating body, Each vibration system including the vibrating body and each vibration output system,
An actuator having different resonance frequencies, wherein the excitation means is configured to cause the vibrating body to vibrate corresponding to the resonance frequency of each of the vibration systems. 2. The vibrating body according to claim 1, wherein the vibrating body is configured such that one end is a fixed end and the other end is displaced in the in-plane direction by a vibration frequency when performing bending vibration in an out-of-plane direction. An actuator, wherein the displacement of the movable end in the in-plane direction is output from each of the vibration output systems as vibration in the in-plane direction. 3. The actuator according to claim 2, wherein the excitation means includes a piezoelectric element formed on at least one surface of the diaphragm, and a drive circuit for driving the piezoelectric element. 4. The apparatus according to claim 2, wherein the excitation means includes a magnetic body formed on the diaphragm, an electromagnetic magnet facing the magnetic body, and a drive circuit for the electromagnetic magnet. An actuator characterized by the above-mentioned. 5. The method according to claim 2, wherein
Each of the vibration output systems includes an elastic portion that holds an end of the diaphragm, and a lever whose base end is connected to the elastic portion and the end, and whose distal end is a free end. An actuator, comprising: 6. The actuator according to claim 5, wherein the elastic portion is configured as a constricted portion of a plate-like member arranged planarly with respect to the diaphragm. 7. The actuator according to claim 5, wherein the lever is a plate-like lever arranged in a plane with respect to the diaphragm. 8. The vibration output system according to claim 6, wherein each of the vibration output systems includes a vibration output system in which the lever drives the same driven member in different directions. Actuator. 9. The actuator according to claim 6, wherein each of the vibration output systems is configured such that each lever drives the same driven member in the same direction. 10. A timepiece, wherein the actuator defined in claim 1 is used as a driving device of a calendar display mechanism. 11. The timepiece according to claim 10, wherein the calendar display mechanism includes a ring-shaped calendar display wheel that rotates by receiving vibrations from the respective vibration output systems at a peripheral edge. 12. The calendar display vehicle according to claim 11, wherein, when one of the levers of each of the vibration output systems is located within the notch during the rest period of the actuator. A timepiece wherein the lever has a plurality of notches on the periphery thereof outside the notches.