CN1698019A - Driving device, timing device and control method of timing device - Google Patents

Abstract

A timing device having a generator unit, a storage unit, and a drive unit is provided. The generator unit has a generating coil and converts kinetic energy into electric energy by utilizing electromagnetic induction. The storage unit stores the electric energy. The drive unit has a piezoelectric actuator, a mechanical structure, and a time display unit. The piezoelectric actuator is supplied with the electric energy from the storage unit and is caused to oscillate according to signals from the communication unit. The mechanical structure is provided with a time display unit and is driven by the piezoelectric actuator.

Description

Driving device, timing device and control method of timing device

technical field

The present invention relates to a driving device, a timing device, and a control method for the timing device, and more particularly to a driving device, a timing device, and a control method for the timing device used as a clock incorporating a power generating device utilizing electromagnetic induction or a radio-corrected clock.

Background technique

In recent years, a clock with an electromagnetic generator that incorporates a generator with a generator coil, uses electromagnetic induction to generate electricity, accumulates the generated power, and uses it as a driving power supply has been commercialized (for example, refer to Japanese Patent Application Laid-Open 2000- Bulletin No. 147167).

In the above-mentioned conventional clock with an electromagnetic generator, the leakage magnetic field of the generator motor is relatively large, and the influence of the leakage magnetic field on the electromagnetic motor for the clock is not small, and the clock body may be stopped due to the leakage magnetic field, or the display time may be generated. Delay.

In addition, conventionally known radio-controlled clocks receive long-wave standard radio waves (JG2AS) from the outside at predetermined intervals, and correct the display time of radio-controlled clocks based on time data superimposed on the long-wave standard radio waves (JG2AS).

One cycle (=1 piece of data) of the time data included in the long-wave standard radio wave used to correct the display time of the radio-controlled clock is 60 seconds. The time data includes: the total number of days from January 1 of the current year to the current day, the current time, and the current classification data.

In addition, in the conventional radio-controlled clock, when receiving the long-wave standard radio wave with the receiving antenna, electromagnetic noise is generated by using the stepping motor for driving the hands for displaying the time, and the long-wave standard radio wave may not be received accurately. The time data contained in it is in an unreceivable state or a wrongly received state.

In order to solve this problem, in the technology described in Japanese Patent No. 3163403, the following structure is adopted, that is, a circuit for stopping the stepping motor is provided during the reception of the long-wave standard radio wave, and the generation of the stepping motor is prohibited. Electromagnetic noise, and correct the current time after receiving the long-wave standard radio wave.

Therefore, in the radio wave correction clock described in the above-mentioned Japanese Patent No. 3163403, there are following problems: the circuit structure is complicated, and the time display is inaccurate in the reception of the long-wave standard radio wave.

Contents of the invention

Therefore, it is an object of the present invention to provide a driving device, a timekeeping device, and a control method for a timekeeping device that can display accurate time even when generating electricity or receiving long-wave standard radio waves, and can simplify the circuit structure.

The driving device according to the first aspect of the present invention is characterized by comprising: a power generation unit having a power generation coil for converting kinetic energy into electric energy by electromagnetic induction; a power storage unit for storing the electric energy; and a time display unit for displaying The piezoelectric actuator supplied with the electric energy of the power storage unit serves as a driving source, and displays time information through a mechanical mechanism.

According to the above configuration, the power generation unit converts kinetic energy into electric energy by electromagnetic induction.

The power storage unit stores electric energy converted by the power generation unit.

The time display unit uses the piezoelectric actuator supplied with electric energy from the power storage unit as a drive source, and displays time information through a mechanical mechanism.

A second aspect of the present invention is characterized in that, in the driving device according to the first aspect, the power generating unit is disposed between an orthographic projection of the piezoelectric actuator on a plane perpendicular to the thickness direction of the driving device and the power generating unit. The location where the orthographic projections of the sections on the plane do not coincide.

A third aspect of the present invention is characterized in that, in the driving device according to the first aspect, the power generating unit is disposed between an orthographic projection of the piezoelectric actuator on a plane perpendicular to the thickness direction of the driving device and the power generating unit. The location where at least a part of the orthographic projection of the section on the plane coincides.

A fourth aspect of the present invention is characterized in that, in the driving device of the first aspect, either one of the power generating unit and the piezoelectric actuator is disposed on one side of a structural member, and the other is disposed on one side of a structural member. the other side of the structural member.

A fifth aspect of the present invention is characterized in that, in the driving device according to any one of the first to fourth aspects, the piezoelectric actuator includes a vibrating plate comprising a plate-shaped piezoelectric element and a reinforcing plate. laminated; a fixing part, which fixes the vibrating plate on the supporting body; and an abutting part, which is provided at an end in the longitudinal direction of the vibrating plate; by supplying a driving signal to the piezoelectric element, The piezoelectric element is expanded and contracted to cause the vibrating plate to expand and contract in the longitudinal direction and to vibrate in a direction intersecting the longitudinal direction, and the vibration plate is driven by displacement of the contact portion accompanying these vibrations. The driven body of the above-mentioned mechanical mechanism.

According to a sixth aspect of the present invention, in the driving device according to any one of the first to fifth aspects, the mechanical mechanism is configured as a time display unit that displays time information.

According to a seventh aspect of the present invention, in the driving device according to any one of the first to fifth aspects, the mechanical mechanism is configured as an analog display device that displays a physical quantity with an analog pointer.

The timekeeping device in the eighth aspect of the present invention is characterized in that it includes: an antenna; a communication unit that communicates with an external communication device through the antenna; and a time display unit that uses a piezoelectric actuator as a The driving source displays time information through a mechanical mechanism.

According to the above configuration, the communication unit communicates with the external communication device through the antenna, and simultaneously or independently, the time display unit uses the piezoelectric actuator as a driving source to display time information through a mechanical mechanism.

A ninth aspect of the present invention is characterized in that, in the eighth aspect, the communication unit includes: a receiving unit that receives time information from the outside through the antenna at a predetermined cycle; and a current time counting unit that communicates with the The time corresponding to the time information received by the receiving unit is used as a reference, and the current time information is sequentially updated; the time display unit uses the piezoelectric actuator as a driving source, and displays the time information through a mechanical mechanism according to the current time information.

A tenth aspect of the present invention is characterized in that, in the eighth or ninth aspect, the piezoelectric actuator rotationally drives the rotor by elliptical motion obtained by combining longitudinal vibration and bending vibration.

An eleventh aspect of the present invention is characterized in that, in the eighth or ninth aspect, the piezoelectric actuator includes: a vibrating plate formed by laminating a plate-shaped piezoelectric element and a reinforcing portion; and a fixing portion , which fixes the vibrating plate on the support body; and an abutment portion, which is provided at the end of the longitudinal direction of the vibrating plate; by supplying a driving signal to the piezoelectric element, the piezoelectric element is stretched The vibrating plate is caused to expand and contract in the longitudinal direction and vibrate in a direction intersecting the longitudinal direction, and the rotor is rotationally driven by the displacement of the contact portion accompanying these vibrations.

A twelfth aspect of the present invention is characterized in that, in the eighth aspect or the ninth aspect, the time display unit includes: a pointer driving actuator for driving a pointer displaying time information; a position where the orthographic projection of the electric actuator on a plane perpendicular to the thickness direction of the timing device does not coincide with the orthographic projection of the antenna on said plane, and is separated by a specified distance in a direction perpendicular to said thickness direction .

A thirteenth aspect of the present invention is characterized in that, in the eighth aspect or the ninth aspect, the time display unit includes: a pointer driving actuator for driving a pointer displaying time information; The position where the orthographic projection of the electric actuator on a plane perpendicular to the thickness direction of the timekeeping device coincides with at least a part of the orthographic projection of the antenna on the plane, and is separated by a predetermined distance in the thickness direction.

The control method of a timekeeping device in a fourteenth aspect of the present invention is characterized in that it includes: a time display step of displaying time information through a mechanical mechanism using a piezoelectric actuator as a driving source; and a communication step of communicating with the time display The steps are parallel, and communication is performed with an external communication device through the antenna.

The control method of a timekeeping device according to a fifteenth aspect of the present invention is characterized in that it includes: a receiving step of receiving time information from the outside through an antenna at a predetermined cycle; The time corresponding to the time information is used as a reference, and the current time information is sequentially updated; and the time display step is to drive the piezoelectric actuator, and display the time information through a mechanical mechanism according to the current time information.

Description of drawings

FIG. 1 is a block diagram showing the configuration of a timekeeping device according to the first embodiment.

Fig. 2 is a plan view of main parts of the timekeeping device according to the first embodiment.

Fig. 3 is a partial sectional view of the timekeeping device according to the first embodiment.

FIG. 4 is an explanatory view showing the structure of a piezoelectric actuator.

Fig. 5 is a side view of the piezoelectric actuator.

Fig. 6 is a plan view of the piezoelectric actuator.

FIG. 7 is an enlarged view of a contact portion of a piezoelectric actuator.

Fig. 8 is a partial cross-sectional view of a timekeeping device according to a second embodiment.

Fig. 9 is a partial sectional view of a timekeeping device according to a third embodiment.

FIG. 10 is a diagram illustrating frequency-impedance characteristics in a specific configuration of a piezoelectric actuator.

FIG. 11 is an explanatory diagram of an example of an electrode arrangement of a piezoelectric actuator.

Fig. 12 is an explanatory diagram of an electrode configuration of another piezoelectric actuator.

FIG. 13 is an explanatory diagram of the electrode arrangement of the piezoelectric actuator in the case of driving in two directions, the forward direction and the reverse direction.

FIG. 14 is an explanatory diagram of an electrode arrangement of another piezoelectric actuator in the case of driving in both forward and reverse directions.

Fig. 15 is a plan view of main parts of a timekeeping device according to a fourth embodiment.

Fig. 16 is a partial sectional view (part 1) of a timekeeping device according to a fourth embodiment.

Fig. 17 is a partial sectional view (No. 2) of a timekeeping device according to a fourth embodiment.

Fig. 18 is a partial sectional view of a timekeeping device according to a fifth embodiment.

Detailed ways

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

Preferred embodiments of the present invention will be described below with reference to the drawings.

[1] The first embodiment

First, the first embodiment will be described.

FIG. 1 is a block diagram showing an analog electronic clock according to the present embodiment. FIG. 2 is a plan view showing an analog electronic clock according to the present embodiment.

In the timekeeping device according to the first embodiment, the control object of the driving device is the time display mechanism 5, and the time display mechanism 5 is operated using the piezoelectric actuator 41 constituting the driving device.

Here, the power supply part 1 has: a power generating part 1A, which has a generating coil and a pendulum (returning weight) described later, and uses electromagnetic induction to convert the kinetic energy of the pendulum into electric energy for power generation; The alternating current is rectified into direct current; and the secondary battery 1C stores the rectified direct current.

In FIG. 1 , an oscillation circuit 201 of an electronic circuit 2 receives power from a power supply unit 1 and oscillates at 32,768 Hz as a reference signal. The reference signal of 32,768 Hz is set to 1 Hz in the frequency dividing circuit 202 . The signal from the frequency dividing circuit 202 is sent to the control circuit 225 . The control circuit 225 controls the supply timing of the drive pulse of the piezoelectric actuator 41 as the drive source of the time display mechanism 5 . Then, the control circuit 225 inputs a drive pulse command signal to the oscillation circuit 2361 that supplies a drive pulse to the piezoelectric actuator 41 .

When the drive pulse command signal whose supply timing is controlled is input to the oscillation circuit 2361 from the control circuit 225 , it is input to the motor drive circuit 2363 via the waveform shaping circuit 2362 . The motor drive circuit 2363 supplies drive pulses to the piezoelectric actuator 41 . The piezoelectric actuator 41 converts electrical energy into mechanical energy according to the driving pulse, and pokes the outer periphery of the driven body (rotor) 51 by the piezoelectric effect. The rotor 51 rotated by being poked by the piezoelectric actuator 41 rotates and drives the transmission mechanism (reduction gear train) 4 , and drives the time display mechanism 5 . In addition, the display correction of the time display mechanism 5 is performed by the time correction device 8 .

Fig. 2 is a plan view of main parts of the timekeeping device according to the first embodiment. Fig. 3 is a partial sectional view of the timing device.

The timekeeping device 10 is a wrist watch, and the user uses it by wrapping a strap connected to the device main body around the wrist.

The timekeeping device 10 is roughly divided into a power supply unit 1 (see FIG. 1 ), a timekeeping unit described later, and an operation unit 14 .

The power supply part 1 of the timing device 10 has: a pendulum 21, a pendulum wheel 22, a generator rotor intermediate wheel 23, a generator rotor 24, a generator stator 25, a generator coil 26, a secondary battery 1C, and electrically connect the secondary battery 1C to the substrate. The secondary battery positive terminal 27 and the secondary battery negative terminal 28, the pendulum support 29, and the bearing 30. Here, the generator rotor 24, the generator stator 25, and the generator coil 26 constitute the generator unit 1A.

The timing part is roughly divided into: a piezoelectric actuator 41 for driving the second hand constituting the pointer; a transmission mechanism (wheel train part) 4 for transmitting the driving force for driving the pointer; a quartz vibrator 44 for timing; and Reference oscillator signal for timing IC45 for timing that performs various timing processing.

Transmission mechanism 4 is identical with common analog clock, has: rotor 51, rotor pinion 52, No. 5 wheel 53, No. 4 wheel 54, No. 3 wheel 55, No. 2 wheel 56, cylinder wheel 57, second hand 61, minute hand 62, An hour hand 63 , a span wheel 64 , a rotor pressing member 65 , and a wheel train support 66 .

)72和锁杆73，与其他计时装置相同，可进行包含时刻设定、时刻校正的各种设定。为了进一步实现小型化，柄轴71、摇杆72和锁杆73采用钢铁制的构件形成。The operating part 14 has an arbor 71, a rocker (ぉしど

) 72 and lock lever 73, the same as other timing devices, can carry out various settings including time setting and time correction. In order to achieve further miniaturization, the stem 71, the rocker 72, and the lock lever 73 are formed of members made of steel.

Furthermore, the timekeeping device 10 has a bottom plate 75 and a circuit pressure plate 76 as structural components.

Here, the arrangement relationship between the electromagnetic generator and the piezoelectric actuator will be described with reference to FIGS. 2 and 3 .

In the first embodiment, a plane perpendicular to the thickness direction of the timekeeping device 10 is assumed, and the orthographic projection of the piezoelectric actuator 41 on which the power generating unit 1A is disposed on the plane is different from the orthographic projection of the power generating unit on the plane. overlapping position.

With this arrangement, the thickness of the timekeeping device 10 can be reduced, and a thin wristwatch with an electromagnetic generator can be constructed.

Here, the piezoelectric actuator constituting the driving device will be described.

FIG. 4 is an explanatory view showing the structure of a piezoelectric actuator.

The piezoelectric actuator 41 is constituted by sandwiching a reinforcing plate 115 such as a stainless steel plate between two plate-shaped piezoelectric elements 113 and 114 as shown in FIG. 4 . On this reinforcing plate 115, a fixing portion 41A (see FIG. 2 ), a contact portion 41B, and a balance portion 41C are integrally formed. With this laminated structure, damage to the piezoelectric elements 113 and 114 caused by excessive vibration of the piezoelectric actuator 41 or external force can be suppressed.

On the surfaces of piezoelectric elements 113 and 114 , as shown in FIG. 4 , electrodes 113A and 114A are arranged respectively, and voltage from drive circuit 200 is supplied to piezoelectric elements 113 and 114 through these electrodes 113A and 114A.

In the case where the polarization direction of the piezoelectric element 113 and the polarization direction of the piezoelectric element 114 are in opposite directions, in order to make the potentials on the top, center, and bottom of the figure respectively +V, -V, +V (or - V, +V, -V), and when an AC drive signal is supplied from the drive circuit 200, the piezoelectric elements 113 and 114 undergo telescopic displacement.

Here, the driving signal of +V and the driving signal of -V are AC signals with phase inversion. Therefore, the amplitude of the vibration generated by the piezoelectric element 113 on the upper side and the piezoelectric element 114 on the lower side with respect to the stiffener 115 is the same as when 0 V is applied to the stiffener 115 (connecting the stiffener 115 to the ground of the drive circuit 200 It can be increased compared to the case of wire connection). In addition, in FIG. 4 , for convenience of description, the electrodes for power feeding that are in contact with the piezoelectric elements 113 and 114 are omitted, and only the electrodes 113A and 114A located outside are shown.

As the piezoelectric elements 113, 114, lead zirconate titanate, quartz, lithium niobate, barium titanate, lead titanate, lead metaniobate, polyvinylidene fluoride, lead zinc niobate, scandium lead niobate wait.

Next, the operation of the piezoelectric actuator 41 will be described.

When an AC drive signal is applied from the driving circuit 200 to the piezoelectric elements 113 and 114 through the electrodes 113A and 114A, the piezoelectric elements 113 and 114 expand and contract in the longitudinal direction and vibrate. In this case, as shown by the arrows in FIG. 5 , the piezoelectric elements 113 and 114 expand and contract in the longitudinal direction to generate longitudinal vibration. In this way, when the piezoelectric actuator 41 is electrically excited due to longitudinal vibration by applying a drive signal to the piezoelectric elements 113, 114, due to the imbalance in the weight balance of the piezoelectric actuator 41, the piezoelectric actuator The center of gravity of 41 is the rotational moment of the center. Due to this rotational moment, as shown in FIG. 6 , a bending secondary vibration in which the piezoelectric actuator 41 swings in the width direction is induced. At this time, by providing the balance portion 41C at the end portion of the piezoelectric actuator 41 opposite to the contact portion 41B, a larger bending vibration can be induced and a larger rotational moment can be generated.

In this way, by causing the piezoelectric actuator 41 to generate longitudinal vibration and bending vibration and synthesizing the longitudinal vibration and the bending vibration, the contact portion between the contact portion 41B of the piezoelectric actuator 41 and the rotor 51, as shown in FIG. 7 , Move along an elliptical orbit. Then, when the abutting portion 41B draws an elliptical orbit in the clockwise direction, when the abutting portion 41B is located at a position bulging toward the rotor 51 side, the force with which the abutting portion 41B presses the rotor 51 increases. When the contact portion 41B is located at a position where it bulges away from the rotor 51 , the force with which the contact portion 41B presses the rotor 51 decreases. Therefore, while the pressing force of both is high, that is, when the abutting portion 41B is at a position protruding toward the rotor 51 side, the rotor 51 is rotationally driven in the displacement direction of the abutting portion 41B.

As described above, the piezoelectric actuator 41 rotationally drives the rotor 51 by the elliptical motion synthesized by the longitudinal vibration and the bending vibration. At this time, the rotor 51 is pressed by the second rotor pressing member 65 against the abutment portion of the second drive actuator and comes into contact with it, whereby the rotor 51 is reliably rotationally driven.

When the rotor 51 is rotationally driven, the rotor pinion 52 is rotated, and the fifth wheel 53 meshing with the rotor pinion 52 is rotationally driven.

Also, the fifth wheel 53 meshes with the fourth wheel 54 to move the second hand 61 fixed to the fourth wheel 54 .

On the other hand, the third wheel 55 meshing with the fourth wheel 54 is rotationally driven.

Moreover, the No. 3 wheel 55 meshes with the No. 2 wheel 56, and meshes with the span wheel 64 through the No. 2 wheel 56, so that the minute hand 62 fixed on the No. 2 wheel 65 and the hour hand 63 fixed on the barrel wheel 57 move.

The power supply unit 1 includes: a pendulum 21, a pendulum wheel 22, a generator rotor intermediate wheel 23, a generator rotor 24, a generator stator 25, a generator coil 26, a secondary battery 1C, and a secondary battery electrically connecting the secondary battery 1C and a substrate. A positive terminal 27 and a secondary battery negative terminal 28 , a pendulum holder 29 , and a bearing 30 . Here, the generator rotor 24, the generator stator 25, and the generator coil 26 constitute the generator unit 1A.

Next, the operation of the power supply unit 1 will be described.

When the pendulum 21 of the power supply unit 1 is manually rotated by the user of the timekeeping device 10 , the pendulum wheel 22 supported by the pendulum holder 29 rotatably integrally with the pendulum 21 via the bearing 30 rotates.

The pendulum wheel 22 meshes with the generator rotor intermediate wheel 23, and the generator rotor intermediate wheel 23 rotates.

Also, the generator rotor intermediate wheel 23 meshes with the generator rotor 24 , and the generator rotor 24 rotates inside the generator stator 25 to generate alternating current in the generator coil 26 due to electromagnetic induction.

At this time, the AC power generated by the power generating unit 1A is rectified into a DC power by the rectifying circuit 1B (see FIG. 1 ), and stored in the secondary battery 1C.

Then, the direct current accumulated in the secondary battery 1C is supplied to each part of the circuit through the secondary battery positive terminal 27 and the secondary battery negative terminal 28 .

In the first embodiment, it is preferable that the secondary battery 1C is arranged so as not to overlap with the piezoelectric actuator 41 and the power generating unit 1A on the assumption of a plane perpendicular to the thickness direction of the timekeeping device 10 .

Moreover, it is preferable that the operation part 14 is arrange|positioned so that it may overlap with IC45 for clocks on the assumption of the plane perpendicular|vertical to the thickness direction of the timepiece 10. Moreover, since the stem 71, the rocker 72, and the lock lever 73 constituting the operation unit 14 are formed of steel members, it is preferable that the transmission mechanism 4 is arranged at a position facing the power generation unit 1A so as not to have magnetic.

In the first embodiment, since the pointer portion is driven using the piezoelectric actuator, it is not affected by electromagnetic noise caused by the power generation of the electromagnetic generator. Therefore, the pointer drive does not stop, and there is no delay in display timing. In particular, even if the magnetic field of the generator coil is set high, the time display will not be affected by it, and accurate display can be performed. In addition, even if the magnetic field of the generator coil is set high, the magnetic current during power generation will not be changed by using an electromagnetic stepping motor, so high-efficiency power generation can be performed.

In addition, since the piezoelectric actuator and the power generating unit (electromagnetic generator) can be arranged on substantially the same plane, and the piezoelectric actuator that drives the hands can be placed close to the power generating unit, it is possible to reduce the size of the timekeeping device. and thinning.

On the other hand, in order to arrange the electromagnetic stepping motors at a close distance while improving the power generation performance of the power generating unit 1A, it is necessary to consider improving the antimagnetism to prevent malfunction of the electromagnetic stepping motors. As a countermeasure against this, for example, it is necessary to increase the number of coils of the electromagnetic stepping motor. As a result, the coil resistance of the electromagnetic stepping motor increases. Therefore, it is possible to improve the diamagnetism of the electronic clock and perform energy-saving driving. However, since the outer shape of the coil of the electromagnetic stepping motor becomes thick, there arises a problem that the wall thickness up to the vicinity of the rotation center of the pendulum cannot be thickened, and as a result, improvement of power generation performance is prevented.

On the other hand, in the first embodiment, a plane perpendicular to the thickness direction of the timekeeping device 10 is assumed, and the power generating unit 1A is disposed on the orthographic projection of the power generating unit 1A on the plane and the piezoelectric actuator 41 on the plane. Since the orthographic projections of the pendulum do not overlap, the wall thickness up to the center of rotation of the pendulum can be thickened, the moment of inertia can be increased, and the power generation performance can be improved.

[2] Second embodiment

The above-described first embodiment is an embodiment in which, assuming a plane perpendicular to the thickness direction of the timekeeping device 10 (a plane perpendicular to the paper), the power generating unit 1A is arranged in the same plane as the orthographic projection of the power generating unit 1A on the plane. The positions of the orthographic projections of the piezoelectric actuator 41 on this plane do not coincide.

On the other hand, the second embodiment is an embodiment in which the orthographic projection of the piezoelectric actuator 41 on a plane perpendicular to the thickness direction of the timekeeping device 1A is arranged in the same position as the power generating unit 1A. The location where at least a portion of the orthographic projections on the plane coincide.

Fig. 8 is a partial cross-sectional view of a timekeeping device according to a second embodiment. In FIG. 8, the same parts as those in FIG. 2 or 3 are denoted by the same symbols. In addition, in FIG. 8 , the symbol 80 is a small iron wheel, and the symbol 81 is a clutch wheel, which are engaged with each other through the operation of the stem 71 for time correction.

Assuming a plane perpendicular to the thickness direction, the power generating unit 1A is arranged at a position where at least a part of the orthographic projection of the power generating unit 1A on the plane overlaps with the orthographic projection of the piezoelectric actuator 41 on the plane.

With this structure, it is possible to reduce the size of driving devices such as timepieces. In addition, since the power generating unit 1A and the piezoelectric actuator 41 can be partially overlapped, the capacity of the secondary battery 1C can be increased accordingly, and the life of driving devices such as timepieces can be extended. Furthermore, since the power generating unit 1A and the piezoelectric actuator 41 can be partially overlapped and arranged, electrical components such as the secondary battery 1C and the electronic circuit 2 can be brought close to both the power generating unit 1A and the piezoelectric actuator 41. . Therefore, the wiring distance of the entire circuit can be shortened, and energy-saving driving of the drive device can be performed. In addition, since the power generating unit 1A and the piezoelectric actuator 41 can be arranged overlappingly, another piezoelectric actuator can be arranged in the vacated space, and multifunctionalization of the driving device can be realized.

Furthermore, as in the first embodiment, since the pointer portion is driven using the piezoelectric actuator, it is not affected by electromagnetic noise caused by the power generation of the electromagnetic generator. Therefore, the pointer drive does not stop, and there is no delay in display timing.

[3] The third embodiment

The present third embodiment is an embodiment in which either one of the power generation unit 1A and the piezoelectric actuator 41 is arranged on one side of the bottom plate as a structural member, and the other is arranged on the other side of the bottom plate. side.

FIG. 9 shows a partial sectional view of a timekeeping device according to a third embodiment. In FIG. 9, the same parts as those in FIG. 8 are denoted by the same symbols.

In FIG. 9 , the power generating unit 1A is disposed on the inner side (upper side in FIG. 9 ) of the base plate 75, and the piezoelectric actuator 41 is disposed on the front side (lower side in FIG. 9 ) of the base plate 75. example of the situation.

With this structure, assuming a plane perpendicular to the thickness direction of the timekeeping device 10, the power generating section 1A and the piezoelectric actuator 41 can be arranged on the same plane as the orthographic projection of the power generating section 1A on the plane and the piezoelectric actuator 41 on the plane. The position where the orthographic projections on the top overlap, so that the miniaturization of driving devices such as timing devices can be realized. In addition, since the power generating unit 1A and the piezoelectric actuator 41 can be arranged to overlap each other, the capacity of the secondary battery 1C can be increased accordingly, and the life of driving devices such as timepieces can be extended. Furthermore, since the power generating unit 1A and the piezoelectric actuator 41 can be arranged to overlap each other, electrical components such as the secondary battery 1C and the electronic circuit 2 can be brought close to both the power generating unit 1A and the piezoelectric actuator 41 . Therefore, the wiring distance of the entire circuit can be shortened, and energy-saving driving of the drive device can be performed. In addition, since the power generating unit 1A and the piezoelectric actuator 41 can be arranged overlappingly, another piezoelectric actuator can be arranged in the vacated space, and multifunctionalization of the driving device can be realized.

Moreover, as in the first embodiment or the second embodiment, since the piezoelectric actuator is used to drive the pointer portion, it will not be affected by electromagnetic noise caused by the power generation of the electromagnetic generator, so the pointer drive will not Stopping, there will be no delay in displaying the time.

[4] Modifications of the first to third embodiments

In the above description, the specific structure of the piezoelectric actuator 41 has not been described, but specifically, the following forms can be considered.

First, a configuration based on the following shapes for improving the driving efficiency of the piezoelectric actuator 41 is employed. That is, the dimensions of the piezoelectric actuator 41 are set as follows.

7[mm]×2[mm]×thickness 0.4[mm]

Here, two pieces of PZT with a thickness of 0.15 [mm] were used as the piezoelectric element, and a stainless steel plate with a thickness of 0.1 [mm] was used as the substrate.

By adopting such an aspect ratio of approximately 7 [mm]×2 [mm], the resonance frequencies of the above-mentioned longitudinal vibration and bending secondary vibration are approximately equal, and elliptical driving can be efficiently performed.

In addition, in this case, it is preferable that the resonance frequency of the secondary bending vibration is in the range of 0.97 times to 1.03 times the resonance frequency of the longitudinal vibration.

For example, specifically, the resonance frequency is as follows.

Longitudinal vibration : 284.3[kHz]

Bending secondary vibration: 288.6 [kHz] (1.015 times the resonance frequency of longitudinal vibration)

According to the resonance frequency setting of this specific example, in the piezoelectric actuator 41, good elliptical vibration can be obtained.

In addition, according to the aspect ratio of the piezoelectric actuator 41, the resonance frequency of the longitudinal vibration and the resonance frequency of the bending secondary vibration can be easily controlled. In the case of the above example, in a state where the longitudinal length (7 [mm]) is fixed, when the lateral length is less than 2 [mm], the difference in resonance frequency decreases. Also, when the lateral length exceeds 2 [mm], the difference in resonance frequency increases.

This is because, in the case of only changing the lateral length, there is no influence on the resonance frequency of the longitudinal vibration, but only the resonance frequency of the bending secondary vibration is changed.

More specifically, since it varies with the Young's ratio of the piezoelectric element or the stiffener, it must be optimized according to them, but it is known that the aspect ratio is preferably about 7:2. In addition, depending on the mass of the contact portion 41B of the piezoelectric actuator 41 , the resonance frequency of the bending secondary vibration decreases.

Here, the setting of the optimum drive frequency will be described.

FIG. 10 is a diagram illustrating frequency-impedance characteristics in a specific configuration of a piezoelectric actuator.

As shown in FIG. 10, the frequency-impedance characteristics of the piezoelectric actuator 41 are at the minimum value of the longitudinal vibration (resonance frequency of the longitudinal vibration) f1 and the minimum value of the bending secondary vibration (resonance frequency of the bending secondary vibration) There is an anti-resonant frequency f0 between f2.

In the case of the above example, the resonance frequency f1 of the longitudinal vibration is 284.3 [kHz], and the resonance frequency f2 of the bending secondary vibration is 288.6 [kHz]. Therefore, by setting the driving frequency (vibration frequency) of the piezoelectric actuator 41 to 280 to 290 [kHz], longitudinal vibration and bending secondary vibration can be simultaneously generated.

In this case, preferably, a frequency between the resonance frequency f1 of the longitudinal vibration and the resonance frequency f2 of the bending secondary vibration may be set as the driving frequency of the piezoelectric actuator 41 . In the case of the above example, the piezoelectric actuator drive frequency can be set as:

f1＝284.3[kHz]≤drive frequency≤f2＝288.6[kHz]

More preferably, the driving frequency of the piezoelectric actuator can be set to a frequency higher than the antiresonance frequency f0 between the resonance frequency f1 of the longitudinal vibration and the resonance frequency f2 of the secondary vibration of the bending, and lower than the frequency of the bending frequency. The frequency of the resonant frequency f2 of the secondary vibration.

That is: f0<driving frequency≤f2

As a result, larger elliptical vibration (synthesized vibration of longitudinal vibration and bending secondary vibration) can be obtained, and more efficient driving can be performed.

FIG. 11 is an explanatory diagram of an example of an electrode arrangement of a piezoelectric actuator.

A piezoelectric actuator 400A of this modified example is provided with only the entire surface electrode 404 as shown in FIG. 11 .

Furthermore, by disposing the contact portion 41B1 and the balance portion 41C1 on the piezoelectric actuator 41 at an unbalanced position instead of the contact portion 41B of the piezoelectric actuator 41 as a vibrating body, a mechanically unbalanced state is generated. Longitudinal vibration and bending secondary vibration.

In this modified example, two contact parts 41B1 and 41C1 are provided as contact parts, but only one contact part 41B1 may be provided.

Fig. 12 is an explanatory diagram of an electrode configuration of another piezoelectric actuator.

In the modified example of FIG. 11, the structure in which the entire surface electrode 404 is provided is adopted. However, the piezoelectric actuator 400B of this modified example, as shown in FIG. The drive electrode 405 at the position of the portion 41C1, and the detection electrode pair 406.

With this structure, longitudinal vibration of the piezoelectric element is excited by applying a driving voltage to the driving electrode 405, and expansion and contraction of the piezoelectric element generate unbalance. Furthermore, due to the mechanically unbalanced state of the contact portion 41B1 and the balance portion 41C1, the bending secondary vibration is more reliably excited.

Then, the longitudinal vibration and the bending secondary vibration are synthesized to generate elliptical vibration.

Then, for the same reason as in the above modification, the pair of detection electrodes 406 are used as detection electrodes to detect the vibration state, thereby enabling more accurate control.

In the above description, the rotor is driven in one direction, but it may also be configured to be driven in two directions, the forward direction and the reverse direction.

FIG. 13 is an explanatory diagram of the electrode arrangement of the piezoelectric actuator in the case of driving in two directions, the forward direction and the reverse direction.

As shown in FIG. 13 , the electrode arrangement of piezoelectric actuator 400C according to this modification includes a central electrode 401 and two sets of electrode pairs 402 and 403 arranged to intersect with central electrode 401 .

With this structure, in order to drive the ellipse in the first direction (positive direction), the center electrode 401 and the electrode pair 402 are driven by applying a drive voltage. No driving voltage is applied to the electrode pair 403 .

As a result, longitudinal vibration is excited by the central electrode 401, but by applying a driving voltage only to the electrode pair 402 of the electrode pairs 402, 403, the expansion and contraction of the longitudinal vibration of the piezoelectric element is unbalanced, and the corresponding piezoelectric element is excited in the first direction. Bending secondary vibration.

Then, the longitudinal vibration and the bending secondary vibration are synthesized to generate elliptical vibration of the contact portion 341B in the first direction.

On the other hand, in order to drive the contact part 341B elliptically in the second direction (reverse direction), a drive voltage is applied to the center electrode 401 and the electrode pair 403 to drive. No driving voltage is applied to the electrode pair 402 .

As a result, the longitudinal vibration is excited by the central electrode 401, but by applying the driving voltage only to the electrode pair 403 of the electrode pairs 402, 403, the expansion and contraction caused by the longitudinal vibration of the piezoelectric element is unbalanced, and the piezoelectric element is excited in the second direction. The corresponding bending secondary vibration.

Then, the longitudinal vibration and the bending secondary vibration are synthesized to generate elliptical vibration in the second direction.

FIG. 14 is an explanatory diagram of an electrode arrangement of another piezoelectric actuator in the case of driving in both forward and reverse directions.

In the above modified example, the central electrode 401 and two pairs of electrode pairs 402 and 403 are provided, but in the piezoelectric actuator 400D of another modified example, as shown in FIG. 14 , the central electrode 401 is omitted and only two pairs of electrodes are provided. Right 402, 403.

With such a configuration, in order to drive the contact portion 341B elliptically in the first direction (positive direction), a driving voltage is applied to the electrode pair 402 for driving. No driving voltage is applied to the electrode pair 403 .

As a result, the longitudinal vibration of the piezoelectric element is excited by applying a driving voltage to the electrode pair 402, and at the same time, the expansion and contraction of the piezoelectric element is unbalanced, and the corresponding bending secondary vibration is excited in the first direction.

Then, the longitudinal vibration and the bending secondary vibration are synthesized to generate elliptical vibration in the first direction.

On the other hand, in order to drive the contact portion 341B elliptically in the second direction (reverse direction), the electrode pair 403 is driven by applying a drive voltage. No driving voltage is applied to the electrode pair 402 .

As a result, the longitudinal vibration of the piezoelectric element is excited by applying a driving voltage to the electrode pair 403, and at the same time, the expansion and contraction of the piezoelectric element is unbalanced, and the corresponding bending secondary vibration is excited in the second direction.

Then, the longitudinal vibration and the bending secondary vibration are synthesized to generate elliptical vibration in the second direction.

In these cases, it is also preferable to use the electrode pair to which no drive voltage is applied as the detection electrode for detection of the vibration state, for the same reason as in the above modification.

In the above description, the supporting portion of the piezoelectric actuator was not described in detail, but the vibration loss can be reduced by supporting the central portion of the node that becomes the two vibrations of the longitudinal vibration and the bending secondary vibration.

In the above description, the case where the driving device is applied to the timing device has been described, but it can also be applied to displays other than displaying time information with analog hands, for example, natural physical quantities such as temperature and air pressure, or pulse rate and respiration rate. Analog display equipment for biological information meter measurement related to living organisms, other driving devices with mechanical mechanisms such as moving the arms of action figures.

[5] Effects of the first to third embodiments

As described above, according to the first to third embodiments, in the timekeeping device in which the power generation part converts kinetic energy into electric energy by electromagnetic induction, a piezoelectric actuator is used as the driving source of the time display part, so the time display part Accurate time display is possible without being affected by the power generation operation of the power generation unit.

[6] Fourth embodiment

Next, a fourth embodiment will be described.

Fig. 15 is a plan view of main parts of a timekeeping device according to a fourth embodiment. Fig. 16 is a partial cross-sectional view (part 1) of a timekeeping device according to a fourth embodiment. Fig. 17 is a partial sectional view (No. 2) of a timekeeping device according to a fourth embodiment.

The timekeeping device 210 is a wrist watch, and the user uses it by wrapping a strap connected to the device main body around the wrist.

The timekeeping device 210 is roughly divided into: a receiving circuit unit 211 , a power supply unit 212 , a timekeeping unit 213 , and an operation unit 214 .

The receiving circuit unit 211 has: a first receiving crystal oscillator 221 that generates a first reference oscillation signal; a second receiving crystal oscillator 222 that generates a second reference oscillation signal; and performs reception based on the first reference oscillation signal and the second reference oscillation signal. The reception processing IC 223 for processing; and the coil antenna 224 for receiving external transmission radio waves.

The power supply unit 212 has: a battery 231 for supplying power; and a battery terminal 232 for electrically connecting the battery 231 and the board.

The timing unit 213 is roughly divided into: a second driving piezoelectric actuator 241 for driving the second hand constituting the hands; an hour and minute driving piezoelectric actuator 242 for driving the hour and minute hands constituting the hands; The gear train unit 243 for the driving force; the quartz oscillator 244 for the reference oscillation signal for timekeeping; and the IC 245 for timekeeping that performs various timekeeping processes based on the reference oscillation signal for timekeeping.

The train wheel 243 is the same as a general analog clock, and has a seconds rotor 251 , a seconds rotor pinion 252 , a seconds intermediate wheel 253 , a seconds wheel 254 , a second hand 255 , and a second rotor pressing member 256 . The wheel train part 243 also has: the hour minute rotor 261, the hour minute rotor pinion 262, the first hour minute intermediate wheel 263, the second hour minute intermediate wheel 264, the second wheel 265, the minute hand 266, the cylinder wheel 267, the hour hand 268, the span wheel 269, and the rotor pressing member 270 .

The operation part 214 has a stem 271, a first switch 272, a second switch 273, a rocker 274, and a lock lever 275, and is the same as a general timekeeping device, and can perform various settings including time setting and time correction.

Here, the arrangement relationship between the coil antenna and the second-drive piezoelectric actuator will be described with reference to FIGS. 16 and 17 .

In this fourth embodiment, assuming a plane perpendicular to the thickness direction of the timekeeping device 210, the coil antenna 224 is arranged on the orthographic projection of the coil antenna 224 on the plane and the second-driving piezoelectric actuator 241 and the time-division driving piezoelectric actuator 241 are arranged. The orthographic projections of the actuator 242 on the plane do not overlap, and are separated by a predetermined distance D1 in the direction perpendicular to the thickness direction ( FIG. 17 ).

By adopting such an arrangement, the thickness of the timekeeping device 210 can be reduced, and a thin watch can be configured.

In this case, since the structures of the second-drive piezoelectric actuator and the hour-division drive piezoelectric actuator are the same as those shown in FIGS. 4 to 7 and FIGS. 11 to 14 , detailed description is omitted.

Here, the operation of driving the piezoelectric actuator 241 for seconds will be described.

When an AC drive signal is applied from the drive circuit 200 to the piezoelectric elements 113 and 114 through the electrodes 113A and 114A, the piezoelectric elements 113 and 114 vibrate to expand and contract in the longitudinal direction. In this case, as indicated by the arrows in FIG. 5 , the piezoelectric elements 113 and 114 generate longitudinal vibrations that expand and contract in the longitudinal direction. In this way, when the second driving piezoelectric actuator 241 is electrically excited by longitudinal vibration by applying a driving signal to the piezoelectric elements 113, 114, due to an imbalance in the weight balance of the second driving piezoelectric actuator 241, a voltage of The center of gravity of the electric actuator 241 is the center of the rotational moment. Due to this rotational moment, a bending secondary vibration in which the piezoelectric actuator 241 is driven to swing in width as shown in FIG. 6 is induced. At this time, by providing the balance portion 41C at the end portion opposite to the contact portion 41B of the second-drive piezoelectric actuator 241 , larger bending vibration can be induced to generate a larger rotational moment.

In this way, the second drive piezoelectric actuator 241 is caused to generate longitudinal vibration and bending vibration, and the longitudinal vibration and bending vibration are synthesized. In this way, the contact portion of the contact portion 41B of the second drive piezoelectric actuator 241 and the second rotor 251 moves along an elliptical orbit as shown in FIG. 7 . Furthermore, the abutment portion 41B draws an elliptical orbit in the clockwise direction, and when the abutment portion 41B is at a position swelling toward the second rotor 251 , the force with which the abutment portion 41B presses the second rotor 251 increases. On the other hand, when the abutting portion 41B is located at a position swollen away from the second rotor 251 , the force with which the abutting portion 41B presses the second rotor 251 decreases.

Therefore, while both pressing forces are high, that is, when the abutting portion 41B is at a position swelling toward the second rotor 251 , the second rotor 251 is rotationally driven in the displacement direction of the abutting portion 41B.

As described above, the seconds-driving piezoelectric actuator 241 rotationally drives the seconds rotor 251 through the elliptical motion that synthesizes the longitudinal vibration and the bending vibration. At this time, the seconds rotor 251 is pressed by the seconds rotor pressing member 256 to the abutment portion of the seconds driving piezoelectric actuator and brought into contact therewith. Therefore, the second rotor 251 is reliably rotationally driven.

By rotationally driving the second rotor 251, the second rotor pinion 252 rotates. Then, the second intermediate wheel 253 meshing with the second rotor pinion 252 is rotationally driven.

Also, the second intermediate wheel 253 meshes with the second wheel 254 to move the second hand 255 fixed to the second wheel 254 .

On the other hand, the time-division driving piezoelectric actuator 242 rotationally drives the time-division rotor 261 through an elliptical motion combining longitudinal vibration and bending vibration. At this time, the hour-division rotor 261 is pressed against the contact portion of the hour-division driving piezoelectric actuator by the hour-division rotor pressing member 270 to make contact therewith. Therefore, the hour-division rotor 261 is reliably rotationally driven.

By rotationally driving the hour-minute rotor 261 , the hour-minute rotor pinion 262 rotates. Then, the first hour minute intermediate wheel 263 meshing with the hour minute rotor pinion 262 is rotationally driven.

Furthermore, the first hour-minute intermediate wheel 263 meshes with the second hour-minute intermediate wheel 264 , and the second hour-minute intermediate wheel 264 is rotationally driven.

The second hour-minute intermediate wheel 264 meshes with the second wheel 265, and meshes with the span wheel 269 through the second wheel 265, so that the minute hand 266 fixed on the second wheel 265 and the hour hand 268 fixed on the barrel wheel 267 move.

Next, the operation of the receiving circuit unit will be described.

In Japan, the first receiving crystal resonator 221 of the receiving circuit unit 211 generates a first reference oscillation signal corresponding to the 40 kHz long-wave standard radio wave, and outputs it to the receiving processing IC 223 . Similarly, the second reception crystal resonator 222 generates a second reference oscillation signal corresponding to the 60 kHz long-wave standard radio wave, and outputs it to the reception processing IC 223 .

At the same time, a long-wave standard radio wave for receiving time data is superimposed on a coil antenna 224 configured as, for example, a ferrite antenna.

The reception processing IC 223 demodulates the long-wave standard radio wave received by the coil antenna 224 as time data, stores the time data, and notifies the IC for timekeeping.

The reception processing IC 223 is configured to include an AGC (Automatic Gain Control) circuit (not shown), an amplifier circuit, a bandpass filter, a demodulation circuit, and a decoding circuit.

The amplifying circuit of the reception processing IC 223 amplifies the long-wave standard radio signal received by the coil antenna 224 under the gain control of the AGC circuit, and outputs it to the band-pass filter.

The band-pass filter extracts only predetermined frequency components from the amplified long-wave standard radio signal and outputs it to the demodulation circuit.

The demodulation circuit smoothes and demodulates the predetermined frequency component of the input long-wave standard radio signal, and outputs it to the decoding circuit.

The decoding circuit decodes the demodulated long-wave standard radio signal and outputs it as a received output signal.

At this time, the AGC circuit controls the gain of the amplifying circuit based on the output signal of the demodulating circuit so that the reception level of the long-wave standard radio wave signal is kept constant.

At this time, the power saving mode signal is supplied from the timer IC 245 as a signal for controlling to reduce power consumption, and the reception processing IC 223 is controlled to be in the OFF state of the reception operation when it does not need to operate.

Normally, the reception processing IC 223 is controlled by the power saving mode signal so as to perform reception approximately once a day. At this time, if the time data cannot be received normally, the receiving operation is repeated a plurality of times.

In the fourth embodiment, since the pointer portion is driven using the piezoelectric actuator, electromagnetic noise is not generated and reception of long-wave standard radio waves is not affected. Therefore, the receiving operation in the receiving circuit unit 211 can be performed simultaneously with the pointer driving operation of the timekeeping unit 213 .

Therefore, according to the fourth embodiment, it is possible to receive the long-wave standard radio wave and to adjust the time at any time. Furthermore, there is no need to design a control and circuit for stopping pointer driving during the receiving operation, and the control and circuit configuration can be simplified.

[7] Fifth Embodiment

The fourth embodiment described above is an embodiment in which, assuming a plane perpendicular to the thickness direction of the timekeeping device 210 (a plane perpendicular to the paper), the coil antenna 224 is arranged in the same plane as the orthographic projection of the coil antenna 224 on the plane. The orthographic projections of the second-drive piezoelectric actuators 241 on this plane do not overlap, and are separated by a predetermined distance in the direction perpendicular to the thickness direction.

On the other hand, the present fifth embodiment is an embodiment in which the coil antenna is disposed on at least one of the piezoelectric actuator for second driving or the piezoelectric actuator for time division driving, and the piezoelectric actuator is in contact with the piezoelectric actuator. The position where the orthographic projection of the timing device on a plane perpendicular to the thickness direction coincides with at least a part of the orthographic projection of the coil antenna on the plane, and is separated by a predetermined distance in the thickness direction.

Fig. 18 is a partial cross-sectional view of a timekeeping device according to a fifth embodiment. In FIG. 18, the same parts as those in FIG. 16 or 17 are denoted by the same symbols.

Assuming a plane perpendicular to the thickness direction, the coil antenna 224 is arranged at a position where at least a part of the orthographic projection of the coil antenna 224 on the plane coincides with the orthographic projection of the second-drive piezoelectric actuator 241 on the plane, and in the thickness direction above the specified distance D2.

By employing such a structure, the timekeeping device can be downsized.

Furthermore, as in the fourth embodiment, reception of long-wave standard radio waves and time adjustment can be performed at any time. Furthermore, there is no need to design a control and circuit for stopping pointer driving during the receiving operation, and the control and circuit configuration can be simplified.

[8] Modified examples of the fourth embodiment and the fifth embodiment

In the above description, the case has been described as a receiving device that receives long-wave standard radio waves as a communication unit, but it may also be configured as a wireless communication device that performs reception and transmission.

In addition, in each of the above-mentioned embodiments, the case of having the piezoelectric actuator for driving the second and the piezoelectric actuator for driving the hour and minute has been described. Piezoelectric actuator, or set 1 piezoactuator to drive all hands of the second hand, minute hand and hour hand.

In addition, in each of the above-mentioned embodiments, the ferrite antenna 224 is used as an antenna for receiving the long-wave standard radio wave on which the time information is superimposed. A loop antenna or a ferrite antenna can be used, and a microstrip antenna or a helical antenna can be used when receiving radio waves (1.5 GHz) superimposed with time information from GPS satellites.

In addition, in the above-mentioned fourth and fifth embodiments, the time display of hours, minutes, and seconds is automatically corrected based on the long-wave standard radio wave on which time information is superimposed. As mentioned above, since the long-wave standard radio wave also includes date information, if there is also a piezoelectric actuator for driving the calendar display in addition to the piezoelectric actuator for driving the hour, minute and second display, it can be based on the long-wave standard radio wave. An electric wave corrects indication of the date automatically. In addition, in this case, an element for detecting the calendar display position may be added.

In addition, in the above-mentioned fourth and fifth embodiments, the long-wave standard radio wave is received as the radio wave on which the time information is superimposed. Various signals such as paging signal, FM multiplexing signal, CDMA signal, etc.

As described above, according to the fourth embodiment or the fifth embodiment, since the piezoelectric actuator is used as the driving source of the time display unit, it does not affect the communication process between the communication unit and the external communication device through the antenna, Time display operation and communication operation can be performed simultaneously.

In this way, it is unnecessary to provide a control and a circuit for stopping the time display operation during the communication operation, and the control and circuit configuration can be simplified.

Claims (15)

1. A driving device, characterized in that it has: The power generation unit has a power generation coil, which converts kinetic energy into electrical energy by electromagnetic induction; a power storage unit that stores the electric energy; and The drive unit drives the mechanical mechanism using a piezoelectric actuator supplied with electric energy from the power storage unit as a drive source. 2. The driving device according to claim 1, characterized in that, The power generating unit is disposed at a position where an orthographic projection of the piezoelectric actuator on a plane perpendicular to a thickness direction of the drive device does not overlap with an orthographic projection of the power generating unit on the plane. 3. The driving device according to claim 1, characterized in that, The power generating unit is disposed at a position where an orthographic projection of the piezoelectric actuator on a plane perpendicular to a thickness direction of the driving device overlaps with at least a part of an orthographic projection of the power generating unit on the plane. 4. The driving device according to claim 1, characterized in that, Either one of the power generating unit and the piezoelectric actuator is arranged on one surface side of the structural member, and the other is arranged on the other surface side of the structural member. 5. The driving device according to any one of claims 1 to 4, characterized in that, The piezoelectric actuator has: a vibration plate, which is formed by laminating a plate-shaped piezoelectric element and a reinforcement plate; a fixing portion, which fixes the vibration plate to a support; and an abutting portion, which is provided on the longitudinal ends of the vibrating plate, By supplying a driving signal to the piezoelectric element, the piezoelectric element is stretched and contracted to cause the vibrating plate to generate vibration in the direction of expansion and contraction in the longitudinal direction and vibration in a direction crossing the direction of the length. The displacement of the contact part by these vibrations drives the driven body constituting the mechanical mechanism. 6. The driving device according to any one of claims 1 to 5, wherein the mechanical mechanism constitutes a time display portion for displaying time information. 7. The driving device according to any one of claims 1 to 5, wherein the mechanical mechanism constitutes an analog display device that displays physical quantities with analog pointers. 8. A timing device, characterized in that it has: antenna; a communication unit that communicates with an external communication device through the antenna; and The time display unit uses the piezoelectric actuator as a driving source to display time information through a mechanical mechanism. 9. The timing device according to claim 8, characterized in that, The communication unit includes: a receiving unit that receives time information from the outside at predetermined intervals through the antenna; and a current time counting unit that uses the time corresponding to the time information received by the receiving unit as a reference, in order Update the current time information, The time display unit uses a piezoelectric actuator as a driving source, and displays time information through a mechanical mechanism based on the current time information. 10 . The timing device according to claim 8 or claim 9 , wherein the piezoelectric actuator rotates and drives the rotor through an elliptical motion combining longitudinal vibration and bending vibration. 11 . 11. The timing device according to claim 8 or claim 9, wherein: The piezoelectric actuator has: a vibration plate, which is formed by laminating a plate-shaped piezoelectric element and a reinforcement plate; a fixing portion, which fixes the vibration plate to a support; and an abutting portion, which is provided on the longitudinal ends of the vibrating plate, By supplying a driving signal to the piezoelectric element, the piezoelectric element is stretched and contracted to cause the vibrating plate to generate vibration in the direction of expansion and contraction in the longitudinal direction and vibration in a direction crossing the direction of the length. These vibrating displacements of the abutment drive the rotor in rotation. 12. The timing device according to claim 8 or claim 9, wherein: The time display part has a pointer driving piezoelectric actuator for driving a pointer displaying time information, The antenna is arranged at a position where the orthographic projection of the pointer-driven piezoelectric actuator on a plane perpendicular to the thickness direction of the timing device does not coincide with the orthographic projection of the antenna on the plane, and at a position where the orthographic projection of the antenna on the plane does not coincide with the The direction perpendicular to the thickness direction is separated by a predetermined distance. 13. The timing device according to claim 8 or claim 9, wherein: The time display part has a pointer driving piezoelectric actuator for driving a pointer displaying time information, The antenna is arranged at a position where the orthographic projection of the pointer-driven piezoelectric actuator on a plane perpendicular to the thickness direction of the timing device coincides with at least a part of the orthographic projection of the antenna on the plane, and at the position where The thickness direction is separated by a predetermined distance. 14. A control method for a timing device, characterized in that it has the following steps: Time display step: using the piezoelectric actuator as a driving source to display time information through a mechanical mechanism; and Communication step: in parallel with the time display step, communicate with an external communication device through the antenna. 15. A control method for a timing device, characterized in that it has the following steps: Receiving step: receive time information from the outside through the antenna according to the specified cycle; The current time counting step: in parallel with the receiving step, sequentially updating the current time information based on the time corresponding to the received time information; and Time display step: driving the piezoelectric actuator, and displaying time information through a mechanical mechanism according to the current time information.

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