CN100570283C - Drive amout detection device of piezoelectric actuator and electronic equipment - Google Patents

Abstract

Drive amout detection device of piezoelectric actuator and electronic equipment.Problem of the present invention is, a kind of drive amout detection device of piezoelectric actuator is provided, and need not to append structure members such as scrambler, can prevent from the increase of loading from can detect drive amount.As solution, make rotor (20) with respect to rotating shaft eccentric, make the pressing force change that is applied to abutting part (13) from rotor (20) linkedly with the driving of rotor (20).If pressing force change, then change linkedly from the amplitude of the detection signal of detecting electrode (18) output of piezoelectric element and the rotation of rotor (20), therefore,, can detect the drive amount of rotor by detecting oscillation amplitude change.Owing to need not to be provided with scrambler or switch etc.,, can reduce power consumption so can realize miniaturization of size and slimming.

Description

Drive amout detection device of piezoelectric actuator and electronic equipment

Technical field

The present invention relates to drive amout detection device of piezoelectric actuator and electronic equipment.

Background technology

Piezoelectric element from conversion efficiency and the response excellence of electric energy to mechanical energy.Therefore, developing the various piezo-activators of the piezoelectric effect of piezoelectric element in recent years.This piezo-activator is applied to various electronic device field such as the ink gun, supersonic motor, electronic watch, portable equipment of piezoelectric buzzer, printer.

But, piezo-activator is when driven members such as driving rotor, utilize friction force to drive, even therefore the energy of being imported is equivalent (constant), its drive amount (for example, the rotation amount of rotor) also because of the vibrational state of vibrating mass or with driven member engage degree (size of friction force) etc., and equivalent not necessarily.

Therefore, when using piezo-activator,, the position detection unit of certain drive amount detecting unit or driven member can be set usually in order to control this drive amount.

As the drive amount detecting unit, known have a following method, promptly, slit plate is set on rotor, and this slit plate and the rotation of this rotor one are by the scrambler that is made of this slit plate and optical sensor, detect rotation amount (drive amount) (for example, with reference to patent documentation 1).

And, also known following method, that is, the switch by being made of the contact spring with the driving interlock of driven member detects drive amount (for example, with reference to patent documentation 2).

Patent documentation 1: TOHKEMY 2000-199718 communique

Patent documentation 2: TOHKEMY 2000-56046 communique

But, when as patent documentation 1, scrambler being set, have the size increase of piezo-activator, the problem of cost up.And because the inertia of slit plate causes the starting performance of driven member to worsen, actuator must make light emitting diode and photosensitive sensor move all the time in driving, the problem that exists power consumption to increase.

And when the switch that uses as patent documentation 2 by means of contact spring, the load of driven member correspondingly increases, the problem that exists the thickness that drives required power consumption increase, piezo-activator to increase.

Especially, though piezo-activator is applicable to the drive source of miniature portable equipment such as wrist-watch or camera, but when being assemblied on these miniature portable equipment, miniaturization of size/slimming, the low consumption electrification is particularly important, in this, exist existing drive amount detecting unit can not satisfy the problem of abundant requirement.

Summary of the invention

The objective of the invention is to, drive amout detection device of piezoelectric actuator and electronic equipment are provided, it need not to append structure members such as scrambler, can prevent the increase of loading, and can detect drive amount.

Drive amout detection device of piezoelectric actuator of the present invention, this piezo-activator has: vibrating mass, it vibrates by piezoelectric element being provided the drive signal of preset frequency; And abutting part, it is arranged on this vibrating mass, and with the driven member butt, it is characterized in that described piezoelectric element has: drive electrode, it is applied in drive signal; And detecting electrode, vibrational state when its output detection signal, this detection signal vibrate according to drive signal with piezoelectric element is corresponding, and described drive amout detection device of piezoelectric actuator has: the change unit, the driving interlock of itself and described driven member makes described detection signal change; And the drive amount detecting unit, it detects the drive amount of the driven member that is driven by piezo-activator according to by the variation that produce, described detection signal of described change unit.

In the present invention, the detection signal of exporting from the detecting electrode that is arranged at piezoelectric element produces change, and therefore, the drive amount detecting unit that utilization can detect this change detects, thereby can detect the drive amount of driven member.

For example, driven member is a rotor, utilize the change unit to carry out following setting, promptly, along with rotor rotated for 1 week, the amplitude of per 1 vibration of described detection signal diminishes after becoming greatly gradually gradually, turns back to original amplitude, every 1 all amplitude 1 cycles of change of rotation, under this situation, if the amplitude that compares detection signal and the value of cutting off from of being scheduled to are compared, with its 2 value, then every 1 week of rotation of rotor can detect a square wave, thus, can detect rotor and rotate a circle, promptly detect the drive amount (rotation amount) of driven member.

In such the present invention, need not to be provided with scrambler or switch etc., therefore can realize miniaturization of size and slimming.And even the change of the amplitude of detection signal etc. is detected, therefore power consumption also can not increase.

Be preferably, the driving interlock of described change unit and driven member changes the pressing force that is applied between driven member and the vibrating mass herein.

Make the driven member that is applied to mutual butt and the change unit of the change of the pressing force between the vibrating mass if be provided with, then for example can utilize simple structures such as making rotor eccentricity easily to constitute the change unit.And even the pressing force between driven member and the vibrating mass is changed, as long as this variation range is in predetermined scope, then the drive characteristic during same load is constant substantially, can prevent also under the situation that changes pressing force that therefore drive characteristic from descending.

Be preferably herein, described driven member is a rotor, and described drive amout detection device of piezoelectric actuator has application of force unit, and it is at least one side's application of force in this rotor and the vibrating mass, make rotor and vibrating mass butt, described change unit is made of the described rotor of being installed by off-centre with respect to turning axle.

Herein, as application of force unit, can be to driven member lateral vibration side application of forces such as rotors, also can be opposite, the vibrating mass side direction is driven the side application of force.And then, also can and use the application of force unit of the driven member lateral vibration side application of force and the vibrating mass side direction is driven the application of force unit of the side application of force.

According to such structure, by making rotor eccentricity, can make the pressing force change, therefore can realize with very simple structure.And, rotor is more because of the situation eccentric a little with respect to turning axle such as foozle, therefore only be set at the variation of the amplitude that can detect the detection signal that causes by so small off-centre etc., just can detect drive amount by sensitivity (threshold value) with the drive amount detecting unit.Under this situation, rotor itself can directly utilize existing, therefore can further reduce cost.

Be preferably herein, described driven member is a rotor, described drive amout detection device of piezoelectric actuator has application of force unit, it is at least one side's application of force in this rotor and the vibrating mass, make rotor and vibrating mass butt, described change unit is by being formed with recess and protuberance at outer peripheral face, making the described rotor of the distance change from the turning axle to the outer peripheral face constitute.

On outer axial face, form irregular rotor, can utilize punch process easily to make, therefore, compare, can further reduce cost with the situation that makes rotating shaft eccentric.And, because the variation of concavo-convex quantity only takes place detection signal, therefore, can easily set the resolution of drive amount detecting unit according to concavo-convex quantity.

Be preferably, described driven member is a rotor herein, and described drive amout detection device of piezoelectric actuator has: application of force unit bearing part, and the rotation of itself and rotor is rotated linkedly, and is installed by off-centre with respect to turning axle; And application of force unit, itself and described application of force unit bearing part butt, at least one side's application of force in rotor and the vibrating mass makes rotor and vibrating mass butt, and described change unit constitutes has the described application of force unit bearing part of being installed by off-centre with respect to turning axle.

In such structure, rotate linkedly by the rotation that makes application of force unit bearing part and rotor, can make the pressing force change that applies by application of force unit, can detect drive amount according to this change.And,, can easily set the resolution of drive amount detecting unit by the speed ratio (for example reduction gear ratio) of setting with the application of force unit bearing part of the rotation interlock of rotor.

Herein, feature of the present invention is, described driven member is can straight-line moving body, described drive amout detection device of piezoelectric actuator has application of force unit, it is at least one side's application of force in this moving body and the vibrating mass, make moving body and vibrating mass butt, described change unit constitutes by form irregular described moving body on the vibrating mass bearing surface.

Identical with the situation of rotor, driven member is can be straight-line during moving body, because the vibrating mass bearing surface is concavo-convex, imposes on the pressing force change of vibrating mass, therefore, can detect drive amount.

Be preferably, described driven member is can straight-line moving body herein, and described drive amout detection device of piezoelectric actuator has: application of force unit bearing part, itself and moving body move rotation linkedly, and installed by off-centre with respect to turning axle; And application of force unit, itself and described application of force unit bearing part butt, at least one side's application of force in moving body and the vibrating mass makes moving body and vibrating mass butt, and described change unit constitutes has the described application of force unit bearing part of being installed by off-centre with respect to turning axle.

In such structure, by making the rotation linkedly of moving of application of force unit bearing part and moving body, can make the pressing force change that applies by application of force unit, can detect drive amount according to this change.And,, can easily set the resolution of drive amount detecting unit by the speed ratio (for example reduction gear ratio) of setting with the application of force unit bearing part of the mobile interlock of moving body.

Feature of the present invention is that the driving interlock of described change unit and driven member changes the contact angle of the abutting part of driven member and vibrating mass.

Under the situation that contact angle is changed, be applied to the pressing force change of vibrating mass, therefore, can detect drive amount.

Be preferably, described driven member is a rotor or can straight-line moving body herein, and described change unit is made of the groove on the slipping plane that is formed in the driven member, and wherein the abutting part of vibrating mass slides on this slipping plane.

If be formed with groove, then, can easily change contact angle according to the situation of abutting part and this slot part butt and the situation of the part butt beyond abutting part and the groove.Therefore, can utilize the so simple structure of formation groove to constitute the change unit.

Herein, feature of the present invention is the driving interlock of described change unit and driven member, change of load torque.

Under the situation that makes the load torque change, because detection signal also produces change, so can detect drive amount.

Be preferably, described drive amount detecting unit detects the drive amount of the driven member that is driven by piezo-activator according to the amplitude of the detection signal of being exported by described detecting electrode or the variation of frequency herein.

If pressing force or load torque change, therefore the then amplitude of detection signal change, by detecting oscillation amplitude change, can easily detect drive amount.

And, when coming the frequency of controlling and driving signal according to the phase differential of drive signal and detection signal, if pressing force or load torque change, the then frequency shift of drive signal, the frequency of the detection signal identical with the frequency of drive signal also changes, therefore, by detecting the variation of frequency, also can detect drive amount.

And be preferably, in described drive amout detection device of piezoelectric actuator, be provided with driven member, it is followed the driving of described driven member and is driven, described drive amount detecting unit detects the drive amount of described driven member by detecting the drive amount of driven member.

For example, be provided with the rotation of following driven members such as rotor and during driven members such as driven date wheel, as long as detect the drive amount of described driven member by described drive amount detecting unit, can need not to be provided with in addition the sensor etc. of the drive amount of direct mensuration driven member, and can be easily and detect the drive amount of driven member at low cost.

Electronic equipment of the present invention is characterised in that to possess: piezo-activator; Driven member, it is driven by this piezo-activator; And each described drive amout detection device of piezoelectric actuator of a first aspect of the present invention to the 12 aspects.

At this moment, preferred described electronic equipment is the clock and watch that possess as lower unit: timing portion; And the clocking information display part, it shows the clocking information by this institute of timing portion timing.

According to these electronic equipments or clock and watch, owing to have a described drive amout detection device of piezoelectric actuator, so can be reliably and drive controlling driven member exactly.

And, need not to be provided with scrambler or switch etc., therefore, the miniaturization and the slimming of electronic equipment can be realized, and the increase of power consumption can be prevented.

According to piezoelectric actuator drive control device of the present invention and electronic equipment, need not to append structure members such as scrambler, can prevent from the increase of loading from can detect drive amount.

Description of drawings

Fig. 1 is the figure of summary structure of the clock and watch of expression first embodiment of the present invention.

Fig. 2 is the planimetric map that the date of the above-mentioned clock and watch of expression shows the detailed structure of function.

Fig. 3 is the planimetric map of the structure of expression piezo-activator.

Fig. 4 is the planimetric map of the structure of expression piezo-activator.

Fig. 5 is the planimetric map of expression rotor structure.

Fig. 6 is the block scheme of the structure of expression piezoelectric actuator drive control device.

Fig. 7 is the figure of the output waveform of expression detection signal and low-pass filter.

Fig. 8 is the figure of the output waveform of expression waveform shaping circuit.

Fig. 9 is the planimetric map of structure of the piezo-activator of expression second embodiment of the present invention.

Figure 10 is the planimetric map of the rotor of expression the 3rd embodiment of the present invention.

Figure 11 is the stereographic map of the rotor of expression the 4th embodiment of the present invention.

Figure 12 is the planimetric map of the rotor of expression the 4th embodiment of the present invention.

Figure 13 is the figure of the contact angle of expression rotor of the 4th embodiment of the present invention and abutting part.

Figure 14 is the planimetric map of expression the 5th embodiment of the present invention.

Figure 15 is the curve map of the relation of the frequency of drive signal of expression the 6th embodiment of the present invention and phase differential.

Figure 16 is the stereographic map of the rotor of expression the 6th embodiment.

Figure 17 is the figure of the piezo-activator of expression variation of the present invention.

Figure 18 is the figure of the piezo-activator of expression variation of the present invention.

Figure 19 is the figure of the piezo-activator of expression variation of the present invention.

Figure 20 is the figure of the piezo-activator of expression variation of the present invention.

Figure 21 is the figure of the piezo-activator of expression variation of the present invention.

Figure 22 is the figure of the piezo-activator of expression variation of the present invention.

Symbol description

1 electronic watch, 10 date indication mechanisms, 12 vibrating masies, 13 abutting parts, 17 drive electrodes, 18 detecting electrodes, 20 rotors, 21 gears, 50 date wheel, 100 driving control devices, 160 drive amount detecting units, 161 low-pass filters, 162 waveform shaping circuits, 163 counters, 170 detection signals, 201 outer peripheral faces, 202 recesses, 203 protuberances, 210 grooves, 320 rotor bearing bodies, 325 press pressing spring, 328 press the pressing spring bearing part, 404,402 intervals, 500 slide blocks, 501 tooth bars, 510,511 gears, 512 press the pressing spring bearing part, 520 thrust slide supporting bodies, 531 springs, the A piezo-activator.

Embodiment

[1. first embodiment]

Below, with reference to the accompanying drawings, first embodiment of the present invention is described.

And, from second embodiment described later, give same-sign, and simplify or omit explanation parts identical and parts with identical function with the component parts of first embodiment that the following describes.

[1-1 one-piece construction]

Fig. 1 is the figure of expression as the summary structure of the electronic watch 1 of the electronic equipment of present embodiment.Fig. 2 is the planimetric map of detailed structure of the date indication mechanism 10 of expression electronic watch 1.

As shown in Figure 1, electronic watch 1 is the wrist-watch that has the pointer 2 in the indication moment and drive the step motor 3 of this pointer 2.The driving of step motor 3 is by oscillatory circuit 4, frequency dividing circuit 5 and driving circuit 6 controls.Oscillatory circuit 4 has the benchmark oscillation source that is made of quartz vibrator, output reference pulse.Frequency dividing circuit 5 is transfused to from the basic pulse of oscillatory circuit 4 outputs, generates reference signal (for example signal of 1Hz) according to this basic pulse.Driving circuit 6 produces the motor driven pulse that is used to drive step motor 3 according to the reference signal from frequency dividing circuit 5 outputs.

The date indication mechanism 10 of electronic watch 1 has the driving control device 100 of piezo-activator A and this piezo-activator of drive controlling A.This driving control device 100 will detect the moment (for example 24 points) of electronic watch 1 and the switch 8 that opens and closes moves as trigger, drive date indication mechanism 10.

As shown in Figure 2, the major part of date indication mechanism 10 is roughly by constituting with the lower part: piezo-activator A; As the rotor 20 that is rotated the driven object (driven member) of driving by this piezo-activator A; The reducing gear train that the rotational delay of rotor 20 is transmitted simultaneously; And by means of the date wheel 50 of rotating by the driving force of reducing gear train transmission.Reducing gear train has date rotation breast wheel 30,35 and date swiveling wheel 40.These piezo-activators A, rotor 20, date rotation breast wheel 30,35 and date swiveling wheel 40 are supported on the base plate 11.Piezo-activator A has flat OBL vibrating mass 12, and this vibrating mass 12 is configured to the abutting part 13 of its front end and outer peripheral face (sliding contact surface) butt of rotor 20.

The top of date indication mechanism 10 is provided with discoid dial plate 7 (Fig. 1), and the window portion 7A that is provided for showing date on the part of the peripheral part of this dial plate 7 watches the date of date wheel 50 from window portion 7A.

Date rotation breast wheel 30 is made of large-diameter portion 31 and minor diameter part 32.Minor diameter part 32 is the cylindrical shapes that are slightly less than the path of large-diameter portion 31, is formed with the roughly notch part 33 of square shape at its outer peripheral face.This minor diameter part 32 is fixed into respect to large-diameter portion 31 with one heart.Large- diameter portion 31 and 35 engagements of date rotation breast wheel, and gear 21 engagements on the top of date rotation breast wheel 35 and rotor 20.Therefore, the rotation of date rotation breast wheel 30,35 and rotor 20 is rotated linkedly.

Date wheel 50 forms the shape of ring-type, and side face is formed with annular wheel 51 within it.Date swiveling wheel 40 has the gear of five teeth, with annular wheel 51 engagements of date wheel 50.And, being provided with axle 41 at the center of date swiveling wheel 40, this 41 quilt inserts in the through hole 42 that is formed on the base plate 11 loosely.Through hole 42 forms longways along the circumferential length of date wheel 50.In addition, date swiveling wheel 40 and axle 41 by be fixed on the base plate 11 leaf spring 43 by to the upper right side of Fig. 2 to the application of force.By the application of force effect of this leaf spring 43, also can prevent the swing of date wheel 50.

[structure of 1-2. rotor]

Herein, rotor 20 can be remained on the rotor bearing body 320 with rotating freely, and this rotor 20 and piezo-activator A butt also are driven.

Shown in Fig. 3,4, it is that the center freely swings that rotor bearing body 320 is configured to pin 321, be wound on the end on the axle 324 that is arranged on the base plate 11 by pressing spring (stage clip) 325, with pin 322 butts that are fixed on the rotor bearing body 320, thereby the counter clockwise direction in Fig. 2, be the piezo-activator A side application of force.In addition, engage with fixed pin 323 on being arranged at base plate 11 by the other end of pressing spring 325, be disposed at respectively sell between 322,323 by pressing spring 325 bendings, to rotor bearing body 320 application of forces.

By spring device (pressing pressing spring 325) to these rotor bearing body 320 application of forces, thereby make rotor 20 with predetermined butt power (contact is pressed) and piezo-activator A butt.

Herein, as shown in Figure 5, the rotation center C2 of rotor 20 is arranged at from the position of the central point C1 off-centre of rotor 20.In addition, among Fig. 5, the left side is not have eccentric rotor, and the right side is the rotor 20 of present embodiment.

Therefore, in the rotor process in 20 1 weeks of rotation, the rotation center of rotor 20 varies to maximal value rmax to the length of piezo-activator A from minimum value rmin.

Rotor 20 be pressed spring 325 application of forces with all the time with piezo-activator A butt, therefore, if the change of the length from the rotation center of above-mentioned rotor 20 to piezo-activator A, then impose on acting force (pressing force) change of piezo-activator A from rotor 20, the vibrational state of vibrating mass 12 also changes, and the amplitude of detection signal also changes corresponding to this vibrational state.

Therefore, in the present embodiment,, constitute the change unit that changes above-mentioned detection signal with the driving of rotor 20 linkedly by rotor 20 with respect to rotating shaft eccentric.

[structure of 1-3. piezo-activator]

The vibrating mass 12 of piezo-activator A is by two long limits and two OBL plates that minor face impales.And vibrating mass 12 has the stepped construction that stiffening plate in clamping between 2 rectangles and tabular piezoelectric element, and this stiffening plate and these piezoelectric element shapes are roughly the same, and are the stiffening plates of thickness stainless steel thinner than piezoelectric element etc.As piezoelectric element, can use the various materials of lead zirconate titanate (PZT (trade mark)), quartz, lithium niobate, barium titanate, lead titanates, lead meta-columbute (leadmetaniobate), polyvinylidene fluoride (polyvinylidene fluoride), lead zinc niobate (lead zinc niobate), lead scandate columbate (lead scandium niobate) etc.

Vibrating mass 12 partly has abutting part 13 in the Width substantial middle of a minor face.This abutting part 13 obtains by stiffening plate being cut off methods such as shaping, makes the fore-end with mitigation curved surface outstanding from piezoelectric element.Vibrating mass 12 keeps making the posture of the outer peripheral face butt of the front end of this abutting part 13 and rotor 20.

In addition, in the present embodiment, abutting part 13 is formed on the position with respect to the eccentricity of central axis of the Width of vibrating mass 12, and the weight balancing that constitutes the Width that makes vibrating mass 12 is for uneven, so that be easy to generate flexural vibrations.

Side at the length direction of piezo-activator A is formed with support 14.Method such as the support 14 cut-out shaping by stiffening plate and stiffening plate are integrally formed.This support 14 is fixed on the base plate 15 by screw 15 grades.

And, circuit substrate 16 is installed on support 14.And, on the surface of piezoelectric element, be formed with drive electrode 17 and detecting electrode 18, this detecting electrode 18 and these drive electrode 17 insulation, the lead that stretches out from circuit substrate 16 is connected on each electrode 17,18.

In above structure, by apply the drive signal of preset frequency to piezoelectric element from driving control device 100, the flexural vibrations that the vibrating mass 12 of piezo-activator A produces conduct second vibration mode of bringing out as compressional vibration and this compressional vibration of first vibration mode, abutting part 13 moves in the mode of drawing elliptical orbit in the plane that comprises this plate face.The outer peripheral face of rotor 20 is tunked by the abutting part 13 of this vibrating mass 12, among Fig. 2, counterclockwise to be driven in rotation.The rotation of this rotor 20 passes to date swiveling wheel 40 by date rotation breast wheel 30,35, and this date swiveling wheel 40 is rotated in a clockwise direction date wheel 50.Like this from vibrating mass 12 to rotor 20, from rotor 20 to reducing gear train (date rotation breast wheel 30,35 and date swiveling wheel 40), from the transmission of reducing gear train to the power of date wheel 50, all be the transmission of the power of the direction parallel with the face of the base plate 11 of vibrating mass 12.Therefore, unlike step motor on thickness direction overlapping coil or rotor, and in same plane configuration vibrating mass 12 and rotor 20, can make 10 slimmings of date indication mechanism.And, because can make 10 slimmings of date indication mechanism, so can make electronic watch 1 whole slimming.

And though not shown, (rear side) is provided with below base plate 11: the gear train that takes the needle that connects step motor 3, driving pointer 2; With as secondary cell of power supply etc.As shown in Figure 6, the charging that secondary cell (power supply) 9 is accepted from generator 9A is to each circuit supply of step motor 3, piezo-activator A, driving control device 100.Generator 9A carries out the generating that sun power (sunshine) generates electricity or utilizes the rotation of rotary hammer, with the power charge that sends to secondary cell 9.Herein, at the solar cell that use to produce direct current power during as generator 9A, preferably be connected with secondary cell 9, under the situations as generator 9A such as rotary hammer that uses the generation alternating electromotive force or clockwork spring, preferably be connected with secondary cell 9 by rectification circuit by reverse current prevention circuit.

And power supply is not limited to the secondary cell 9 with generator 9A charging, also can be common one-shot battery (for example lithium ion battery).

[structure of the driving control device of 1-4. piezo-activator A]

Below, according to Fig. 6, the driving control device 100 of present embodiment is described.

The driving control device 100 of present embodiment is installed on the IC chip as circuit, relation according to the driving frequency of the vibrational state of vibrating mass 12 as described above and drive signal, the phase differential that will become optimal drive frequency f 0 is set at target phase difference, change the driving frequency of the drive voltage signal that imposes on vibrating mass 12, piezo-activator A is carried out FEEDBACK CONTROL, so that detected phase differential and target phase difference are approaching when driving.And, driving control device 100 also can be implemented scan control, that is, frequency is reduced successively from compare sufficiently high frequency (original frequency fmax) with optimal drive frequency f 0, make the driving frequency of drive voltage signal consistent with optimum frequency f0.

The driving control device 100 of drive controlling piezo-activator A has: as the driver 110 of driver element, it sends drive signal to piezo-activator A; Driving frequency change unit 120, its input changes the driving frequency of drive signal from the detection signal of piezo-activator A with from the drive signal of driver 110; Control module 130, the action of its controlling and driving frequency change unit 120; And as the voltage detecting circuit 140 of voltage detection unit, it detects the supply voltage of supplying with from secondary cell 9.And among Fig. 4, CR oscillatory circuit 150 is to the fundamental clock drive signal (CLK) of driving frequency change unit 120 and control module 130 output electronic watches 1, and is identical with above-mentioned oscillatory circuit 4.

Driving frequency change unit 120 has first and second waveform shaping circuits 121,122, as the phase differential DC change-over circuit 123 of phase difference detection unit, phase differential comparator circuit 124, up-down counter 126, DA change-over circuit 127 and the variable frequency oscillating circuit 128 of unit as a comparison.Promptly, driving frequency change unit 120 detects the drive signal that outputs to vibrating mass 12 from driver 110, and this drive signal is applied to result on the drive electrode of vibrating mass 12 promptly by the vibration of vibrating mass 12 detection signal from the output of vibration detection electrode, detect the phase differential of these drive signals and detection signal, and more detected phase differential and the target phase difference of setting according to optimal drive frequency f 0, according to the driving frequency of comparative result change drive signal, the driving frequency signal after this change is exported to driver 110.Driver 110 is to be electrically connected with the drive electrode of vibrating mass 12, will amplify from the output signal of variable frequency oscillating circuit 128 output, drive signal is applied to the circuit on the drive electrode of vibrating mass 12.

First and second waveform shaping circuits the 121, the 122nd, the vibration detection electrode with driver 110 and vibrating mass 12 is electrically connected respectively, input is from the drive signal of driver 110 outputs and the detection signal of exporting from the vibration detection electrode, waveform to these drive signals and detection signal carries out shaping, the drive signal after the shaping and detection signal is outputed to the circuit of phase differential DC change-over circuit 123.

Phase differential DC change-over circuit 123 be output with shaping in waveform shaping circuit 121,122 after drive signal and the circuit of the corresponding signal of the phase differential of detection signal.This phase differential DC change-over circuit 123 has not shown phase difference detection portion and average voltage transitions portion.The phase signal of the pulse width that the phase differential of generation of phase difference detection portion and drive signal and detection signal is suitable outputs to the average voltage converter section with this phase signal.The average voltage converter section will be from the phase signal equalization of phase difference detection portion output, will output to phase differential comparator circuit 124 with the phase signal of the proportional level of phase differential of drive signal and detection signal.

Phase differential comparator circuit 124 is relatively from the magnitude of voltage of the phase signal of phase differential DC change-over circuit 123 output be equivalent to the comparing voltage value of the target phase difference 125 set according to optimal drive frequency f 0, and result's comparison information is as a comparison outputed to up-down counter 126.This phase differential comparator circuit 124 for example is made of comparer etc., under the situation of magnitude of voltage smaller or equal to comparing voltage value of phase signal, the signal of the high level of information (H) is as a comparison outputed to up-down counter 126.And, under the situation of magnitude of voltage greater than comparing voltage value of phase signal, the low level signal (L) of information is as a comparison outputed to up-down counter 126.Thus, implement drive controlling, from the driving frequency locking of the drive signal of driver 110 outputs in design near the driving frequency f0 of the best.

Up-down counter 126 is according to the comparison information (H or L signal) from 124 outputs of phase differential comparator circuit, makes variable frequency oscillating circuit 128 change the circuit of the driving frequency of drive signal, has 2 not shown AND gates.This AND gate input is from the signal (H or L) of the comparison information of phase differential comparator circuit 124 outputs and the CLK signal that sends from CR oscillatory circuit 150, incoming timing according to this CLK signal, if comparison information is the signal (H) of high level, then implement to increase the counting input, if comparison information is low level signal (L), then implement to subtract the counting input.Up-down counter 126 for example is made of 12 counter etc., by from the increasing the counting input or subtract the counting input of AND gate, increases or reduce count value, and 12 count values are outputed to D/A change-over circuit 127.

D/A change-over circuit 127 has frequency control voltage value corresponding to the count value of up-down counter 126 at inner setting.And when input during from the count value of up-down counter 126 output, the frequency control voltage signal that this D/A change-over circuit 127 will be equivalent to the frequency control voltage value corresponding with this count value outputs to variable frequency oscillating circuit 128.

Variable frequency oscillating circuit 128 vibrates with the frequency corresponding with the frequency control voltage signal of exporting from D/A change-over circuit 127, and its signal is outputed to driver 110.And driver 110 will impose on the drive electrode of vibrating mass 12 with the drive signal from the corresponding driving frequency of the output signal of variable frequency oscillating circuit 128 outputs.

Control module 130 bases are by voltage detecting circuit 140 detected supply voltages, and the driving frequency change of the drive signal that controlling and driving frequency change unit 120 is carried out is handled.That is, the scan control in the set up procedure of control module 130 enforcements piezo-activator A described later and two kinds of controls of drive controlling at intermittence of piezo-activator A.

This control module 130 has control circuit 131 and timer 132.Timer 132 inputs output to control circuit 131 according to this CLK signal with temporal information from the CLK signal that CR oscillatory circuit 150 sends.Control circuit 131 is exported the instruction that temporal information is resetted to timer 132 in the drive controlling in scan control or intermittently.And to the power supply voltage signal of control circuit 131 inputs from voltage detecting circuit 140, control circuit 131 detects the supply voltage value of secondary cell 9 according to this power supply voltage signal.

And control circuit 131 is according to from the power supply voltage signal of voltage detecting circuit 140 and from the temporal information of timer 132, to up-down counter 126 or driver 110 output control signals.That is, when implementing the scan control of piezo-activator A, control circuit 131 is made as 0 to up-down counter 126 output initializing signals with count value, and the driving frequency of drive signal is initialized as original frequency fmax.And at intermittence of implementing piezo-activator A during drive controlling, control circuit 131 stops or beginning from the output of driver 110 to the drive signal of piezo-activator A to driver 110 output stop signals or commencing signal again.

Control by such control circuit 131 is implemented according to supply voltage, specifically, when piezo-activator A starts or the decline rate of supply voltage when faster than benchmark decline rate, implements scan control.And, after piezo-activator A starting, when the decline rate of supply voltage is slower than benchmark decline rate, implement intermittently drive controlling.

And control circuit 131 will be worked as triggering from the driving commencing signal of switch 8, according to the CLK signal that sends from CR oscillatory circuit 150, make piezo-activator A starting.And to the rotation detection signal of control circuit 131 inputs from drive amount detecting unit 160 of the present invention, control circuit 131 sends stop signal according to this signal to driver 110, finishes the driving of piezo-activator A.

[structure of 1-5. drive amount detecting unit]

As shown in Figure 6, drive amount detecting unit 160 constitutes to be possessed: low-pass filter 161, and it is imported by the detected detection signal of piezo-activator A; Waveform shaping circuit 162, its input is from the signal of low-pass filter 161 outputs; And counter 163, its input is from the signal of waveform shaping circuit 162 outputs.

Herein, as if the rotation along with rotor 20, the rotation center of rotor 20 is to the distance change of the abutting part 13 of piezo-activator A, and then as shown in Figure 7, the pressing force that is applied to piezo-activator A from rotor 20 also changes.That is, pressing force reached minimum when the distance from the rotation center of rotor 20 to abutting part 13 was rmin, distance during for rmax pressing force reach maximum.

If pressing force increases, then the vibratory output of piezo-activator A is suppressed, and therefore, the displacement (or deflection) of the piezoelectric element of detecting electrode 18 parts reduces, and descends from the detection voltage of the detection signal 170 of detecting electrode 18 outputs.On the other hand, if pressing force reduces, then the vibratory output of piezo-activator A increases, and therefore, the displacement (or deflection) of the piezoelectric element of detecting electrode 18 parts also increases, and the detection voltage of detection signal 170 increases.

From the detection signal 170 of detecting electrode 18 outputs are signals identical with driving signal frequency, but by behind the low-pass filter 161, the low frequency signal 171 of the amplitude variations of expression detection signal 170 is removed.

This signal 171 is that 20 1 weeks of rotation of rotor are the signal in 1 cycle, therefore, as shown in Figure 8, compare by utilizing waveform shaping circuit 162 and predetermined threshold value, be shaped as rectangular pulse signal 172, thereby 1 cycle that became is the rectangular pulse signal 172 of high level 1 time.

If this rectangular pulse signal 172 is input to counter 163, then whenever 20 1 weeks of rotation of rotor, count value increases, and therefore, the count value of counter 163 is represented the rotation number of rotor 20.

The rotation of rotor 20 passes to date wheel 50 by reducing gear train, can detect the rotation amount of date wheel 50 according to the rotation number of rotor 20.

Therefore, when the rotation amount detection signal (count value) of counter 163 that from rotor 20 is rotation amount (drive amount) detecting unit 160 of date wheel 50 reaches predetermined rotation amount (for example rotation amount of 1 feed ration of date wheel 50), system is driven loop 131 and is sent stop signal to driver 110, finishes the driving of piezo-activator A.

And driving frequency change unit 120 can constitute to have not shown integrating circuit and replaces up-down counter 126, according to the driving frequency of the output valve change drive signal of this integrating circuit.Integrating circuit constitutes has capacitor, and the quantity of electric charge that is accumulated in this capacitor is outputed to D/A change-over circuit 127 as output valve, thereby changes the driving frequency of drive signal.And with the driving frequency initialization of drive signal the time, according to from the instruction of control circuit 131 charge discharge with capacitor, being initialized as electric charge is that the original frequency fmax of 0 setting state gets final product.

[effect of 1-6. first embodiment]

Above-mentioned embodiment has following effect.

(1) owing to be provided with: change unit, the turning axle by making the rotor 20 of free rotary ground supporting on rotor bearing body 320 be from the center off-centre of rotor 20, thereby the pressing force to abutting part 13 is changed along with the rotation of rotor 20; And drive amount detecting unit 160, it detects the amplitude of the detection signal 170 that the change according to above-mentioned pressing force changes, so can utilize the count value of the counter 163 of drive amount detecting unit 160 to come the rotation number (drive amount) of detection rotor 20.

Therefore, need not as existing rotation amount detecting unit, scrambler or switch etc. to be set, so can realize miniaturization of size and slimming.And, the change of amplitude of detection signal etc. is detected, also can prevent the increase of power consumption.

(2) in the present embodiment, only prepare the rotor 20 of rotating shaft eccentric and on the imperial device 100 of the system that drives, drive amount detecting unit 160 is set, can constitute the drive amount pick-up unit, therefore, compare with the situation of using scrambler or switch etc., can reduce cost.

And the resolution of drive amount detecting unit 160 is that 1 week of rotation is 360 degree for rotor 20, and what still will detect rotation amount is date wheel 50, therefore, can set resolution meticulously according to the reduction gear ratio to date wheel 50.For example, if reduction gear ratio is 100, then resolution can be 3.6 degree, can detect rotation amount more subtly.

[second embodiment]

Below, according to Fig. 9, second embodiment of the present invention is described.In addition, in each embodiment below, for the above-mentioned same or analogous structure of each embodiment, give same-sign, and omission or simplified illustration.

In second embodiment, change the structure of the change unit of the pressing force of abutting part 13 differently with first embodiment along with the rotation of rotor 20, and other structures are identical with first embodiment, and therefore the structure to the change unit describes.

In the variation setup unit of first embodiment, make the rotating shaft eccentric of rotor 20, but in the variation setup unit of second embodiment, adopt following structure, promptly, do not make rotating shaft eccentric, but, make amount of bow change, thereby pressing force is changed by pressing spring 325 to rotor 20 application of forces along with the rotation of rotor 20.

That is, free rotary ground supporting gear 326 and gear 327 on rotor bearing body 320, gear 21 engagements on this gear 326 and the turning axle that is fixed in rotor 20, this gear 327 and this gear 326 engagements.Be fixed with on the gear 327 and above-mentioned discoideus by pressing spring 325 butts by pressing spring bearing part 328.At this moment, gear 327 is set at respect on the position by the central point C3 off-centre of pressing spring bearing part 328.

Therefore, when rotor 20 rotations, when making by 328 rotations of pressing spring bearing part by gear 21,326,327, the amount of bow change of pressing pressing spring 325, the pressing force that is applied on the abutting part 13 by rotor bearing body 320 and rotor 20 changes.

Therefore, along with the rotation of rotor 20,, therefore, can use the drive amount detecting unit 160 identical to come the rotation amount of detection rotor 20 with above-mentioned first embodiment from the amplitude change of the detection signal of detecting electrode 18 output of piezo-activator A.

[effect of second embodiment]

In the present embodiment, when can bring into play the action effect identical, can also obtain following effect with above-mentioned first embodiment.

(2-1) owing to need not to make rotor 20 off-centre, thereby as rotor 20, the common rotor that can utilize in the past the rotor as piezo-activator A to utilize need not to make special eccentric rotor 20, therefore, can reduce the manufacturing cost of rotor 20.

(2-2) since make with rotor 20 rotate linkedly by pressing spring bearing part 328 off-centre, so by setting the speed ratio of gear 21,326,327, for example, the count value that can be set at rotor 20 rotation during 10 weeks, counter 163 increases by 1, in addition, the count value that also can set rotor 20 rotation during 1 week, counter 163 for increases by 10, has the advantage that can freely set the resolution of drive amount detecting unit 160.

But, owing to must make and rotating of contacting by pressing spring 325, compare the corresponding increase of load with above-mentioned first embodiment by pressing spring bearing part 328, therefore, aspect lightening the load, first embodiment is more favourable.

[the 3rd embodiment]

Below, according to Figure 10, the 3rd embodiment of the present invention is described.

In the 3rd embodiment,, do not make the rotating shaft eccentric of the rotor 20 that is supported on the rotor bearing body 320, and the outer peripheral face (slipping plane) 201 of rotor 20 is formed concaveconvex shape as the change unit.Other structure and above-mentioned first embodiment just as, therefore omit explanation.

Be formed with recess 202 and protuberance 203 on the outer peripheral face 201.These recesses 202, protuberance 203 are formed by circular arc or SPL etc., abutting part 13 and outer peripheral face 201 butts, and rotor 20 can rotate swimmingly simultaneously.In addition, the width dimensions of recess 202 (along the size of the direction of outer peripheral face 201) is set at that the width dimensions than abutting part 13 is big at least, thereby move when can make abutting part 13 with recess 202 butts, that is, abutting part 13 moves, is applied to the pressing force change of piezo-activator A to recess 202 parts.

And such rotor 20 can be by manufacturings easily such as punching presses.

If use such rotor 20, then the rotation center of rotor 20 changes because of recess 202 and protuberance 203 to the distance of the abutting part 13 of piezo-activator A, therefore, from impose on the pressing force change of piezo-activator A by rotor bearing body 320, rotor 20 by pressing spring 325, follow this change, therefore the amplitude change of detection signal, can utilize drive amount detecting unit 160 to detect the rotation amount of rotor 20.

[effect of the 3rd embodiment]

According to the 3rd embodiment, can obtain and the identical action effect of above-mentioned first embodiment, but also can obtain following effect.

(3-1) can use by punch process etc. and on outer peripheral face 201, form concavo-convex rotor 20, therefore, compare by the situation of pressing spring bearing part 328 with the such setting of rotating shaft eccentric or second embodiment that makes that first embodiment is such, can realize with low cost.

(3-2) and, the amplitude variations of detection signal is to be 1 cycle with a jog, therefore, and can be according to the quantity of recess 202 and protuberance 203, the count value of setting the counter 163 of rotor 20 rotations during 1 week increases number, can easily set the resolution of drive amount detecting unit 160.

(3-3) and, the width dimensions of abutting part 13 is being set for width dimensions than recess 202 when big, might can not in recess 202, move by abutting part 13, the feasible not change of pressing force that is applied on the piezo-activator A, but in the present embodiment, bigger owing to the width dimensions of recess 202 is set for than the width dimensions of abutting part 13, therefore, move when can make abutting part 13, can change pressing force reliably with recess 202 and protuberance 203 butts.

[the 4th embodiment]

Below, according to Figure 11～13, the 4th embodiment of the present invention is described.

In the 4th embodiment,, do not make the rotating shaft eccentric of the rotor 20 that is supported on the rotor bearing body 320, and on the outer peripheral face 201 of rotor 20, form groove 210 as the change unit.Other structure and above-mentioned first embodiment just as, therefore omit explanation.

This outer peripheral face 201 forms groove 210 at certain intervals in outer peripheral face 201 upper edges.Groove 210 constitutes to have: bottom surface sections 211, and the outer peripheral face 201 of itself and rotor 20 is a concentric circles; And inclined plane part 212, it is from this bottom surface sections 211 side face 201 tilted configuration outward.

In such present embodiment, when outer peripheral face 201 butts of the abutting part 13 of piezo-activator A and rotor 20, shown in Figure 13 (A), its contact angle is for for example about 30 spending.On the other hand, shown in Figure 13 (B), have following state: during one of them inclined plane part 212 butt of abutting part 13 and groove 210, contact angle is for for example about 45 spending.

Variation by such contact angle, the pressing force that is applied on the abutting part 13 from rotor 20 also changes, therefore, abutting part 13 from outer peripheral face 201 through grooves 210 to next outer peripheral face 201 move during, 1 cycle of the amplitude variations of detection signal, the count value of counter 163 increases, so can detect the rotation amount of rotor 20.

In addition, the width dimensions of groove 210 (along the size of the direction of outer peripheral face 201) is set at that the width dimensions than abutting part 13 is big at least, thereby make abutting part 13 can with groove 210 butts in move, that is, abutting part 13 changes at the pressing force that groove 210 parts move, are applied on the piezo-activator A.

[effect of the 4th embodiment]

According to the 4th embodiment, can obtain and the identical action effect of above-mentioned the 1st, 3 embodiments.

That is, if contact angle is about 45 degree, be that about 30 situations about spending are compared then with contact angle, on the surface, the pressing force that is applied on the piezo-activator A increases, so the amplitude of detection signal diminishes.Therefore, if abutting part 13 and each groove 210 part butt occur, contact angle is the states of 45 degree, and the amplitude variations of detection signal then can detect the rotation amount of rotor 20.

And, the width dimensions of abutting part 13 is set at width dimensions than groove 210 when big, might can not in groove 210, move by abutting part 13, the pressing force that is applied on the piezo-activator A is not changed, but in the present embodiment, bigger owing to the width dimensions of groove 210 is set for than the width dimensions of abutting part 13, therefore, move when can make abutting part 13, can change pressing force reliably with groove 210 butts.

[the 5th embodiment]

Below, according to Figure 14, the 5th embodiment of the present invention is described.

In the respective embodiments described above, as the change unit, the pressing force that is applied on the piezo-activator A from rotor 20 is changed along with the rotation of rotor 20, but in the present embodiment, constitute load torque and change along with the rotation of rotor 20.

For example, the reducing gear train that is made of gear 21 meshed gears 301～304 with rotor 20 is set, also jumper 305 can be set, this jumper 305 is used for the position in restriction date wheel etc. when this reducing gear train is driven in rotation such as for example date wheel.If be provided with jumper 305, then when gear 304 rotations that engages with jumper 305, the changes in load torque the when jumper 305 that is arranged in teeth groove is positioned at next teeth groove with crossing a tooth when tooth of leap.

Then, because the change of load torque, the vibrational state of piezo-activator A changes, and changes from the amplitude of the detection signal of detecting electrode 18 outputs, and the rotation amount that therefore can detect gear 304 is the rotation amount of rotor 20.

Therefore, in the present embodiment, constitute the change unit by jumper 305.

[effect of the 5th embodiment]

According to the 5th embodiment, can obtain and the identical action effect of above-mentioned first embodiment, and have following effect.

(5-1) jumper 305 that will in the past be used for the location of date wheel etc. is also used as the change unit, thereby only by drive amount detecting unit 160 newly is set, can constitute the drive amount pick-up unit.Therefore, compare, can reduce cost with the respective embodiments described above.

(5-2) and, as long as be provided with the gear etc. of jumper 305, change reduction gear ratio from rotor 20 to the gear that is provided with jumper 305 by change, can easily change the resolution of drive amount detecting unit 160.

[the 6th embodiment]

Below, according to Figure 15,16, the 6th embodiment of the present invention is described.

The drive amount detecting unit of the respective embodiments described above is that the change to the amplitude of detection signal detects, but in the present embodiment, detects by the change to the frequency of detection signal, detects drive amount.

That is, in the driving control device 100 of above-mentioned first embodiment, detect the phase differential of drive signal and detection signal, frequency is scanned make this phase differential consistent, lock calmly with the frequency surface of unanimity with predefined target phase difference.Under this situation, if the phase differential of drive signal and detection signal changes according to the drive amount (rotation amount) of rotor 20, then the frequency of drive signal locking also changes.For example, as shown in figure 15, the frequency f 1 of drive signal is changed to frequency f 2 or f3.

Because the frequency of drive signal and detection signal is identical, therefore if the frequency of drive signal changes according to the rotation amount of rotor, then the frequency of detection signal also changes according to the rotation amount of rotor.Therefore, detect, can detect the rotation amount of rotor by frequency variation to detection signal.

In addition, the concrete structure that the phase differential that makes drive signal and detection signal changes according to the rotation amount of rotor, promptly change the concrete structure of unit, can be as above-mentioned first to fourth embodiment, make the structure that is applied to the pressing force change on the piezo-activator A from rotor 20, also can be as the 5th embodiment, use jumper etc. makes the structure of load torque change.

And, the structure that can also adopt the friction factor of the slipping plane that makes rotor 20 to change along the rotor slipping plane.

If friction factor is changed, then the phase differential of drive signal and detection signal is to force external force and by the phase delay between the actual vibration of forcing external force to produce, therefore, during the big part butt of the friction force in the slipping plane of abutting part 13 and rotor 20, compare during than the little part butt of this part with friction force, phase delay increases.For example, as shown in figure 16, be formed with 2 kinds of different intervals 401 of friction factor as if slipping at rotor on the face every θ 1 (=15 degree), 402, then slip on the face at rotor, be formed with 12 bigger interval 401 and friction factor of friction factor respectively and compare interval 401 little intervals 402, can count the frequency change circulation of 12 times detection signal 1 week by rotor 20 rotations.

In such present embodiment, also can bring into play the action effect identical with the respective embodiments described above.

In addition, as in interval 401,402, making the different concrete grammar of friction factor, for example, by making the surface roughness difference in each interval 401,402, form each different interval 401,402 of friction factor, also can for example carry out mirror finish, half mirror finish be carried out in interval 402, thereby make the friction factor difference interval 401.

In addition, the invention is not restricted to above-mentioned embodiment, the distortion in the scope that can reach purpose of the present invention, improvement etc. also are included in the present invention.

For example, as the structure of piezo-activator A, as shown in figure 17, abutting part 13 also can be formed on the core of Width.In such piezo-activator A, on the face of the face side of piezoelectric element 22, form by 5 drive electrodes of cutting apart 221～223, by separately using drive electrode 222,223, can be rotated driving to two directions to rotor 20.

Promptly, if the object that drive electrode 221 and drive electrode 222 are applied as voltage, piezoelectric element 22 is applied voltage, and then vibrating mass 12 evokes compressional vibration and flexural vibrations, and the abutting part 13 of vibrating mass 12 is described the elliptical orbit with respect to the center line inclination of the length direction of vibrating mass 12.And by pushing of abutting part 13, rotor 20 rotates to positive dirction.On the other hand, substitute drive electrode 222, during object that drive electrode 223 is applied as voltage, the center line that drive electrode 222 and drive electrode 223 are in the length direction of vibrating mass 12 serves as that axle becomes the position of line symmetry to concern, by drive electrode 223 is applied voltage, cause with respect to the crisscross of compressional vibration with drive electrode 222 is applied the flexural vibrations that voltage condition becomes the line symmetry.Therefore, the track of the abutting part 13 of vibrating mass 12 is and drive electrode 222 is applied the elliptical orbit that voltage condition becomes line to tilt symmetrically that rotor 20 is by rotation driving round about.And the electrode 222,223 that applies object as voltage does not play the effect of detecting electrode.

And as piezo-activator A, it is tabular to be not limited to form essentially rectangular, also can be shown in Figure 18 (A), forms the tabular of plane almost diamond, or shown in Figure 18 (B), and it is tetragonal tabular to form the plane almost parallel.

And, as shown in figure 19, also can use the piezo-activator A that forms the truss shape.

The concrete structure of other piezo-activator A, in driving control device 100 as the part beyond the formation of major part of the present invention, can when implementing, suitably set.

For example, as the application of force unit that is used to make rotor 20 with abutting part 13 butts of piezo-activator A, be provided with in the respective embodiments described above to the rotor 20 side application of forces by pressing spring 325, but application of force unit to the piezo-activator A side application of force can be set also.

For example, in second embodiment, utilize and press 325 pairs of rotors of pressing spring, the 20 side direction piezo-activator A side application of forces, but also can utilize and press 325 couples of piezo-activator A of pressing spring side direction rotor, the 20 side application of forces as shown in figure 20.

Herein, in the variation of Figure 20, it can be the center rotation with turning axle 350 that the support 14 of piezo-activator A is formed, and, pin 351 also is set, it is used to make above-mentioned by pressing spring 325 and support 14 butts.And, but rotor 20, gear 326,327, press pressing spring bearing part 328 free rotary ground supportings on base plate of electronic watch 1 etc.In such structure, press pin 351 butts of pressing spring 325 and support 14, so piezo-activator A is by the direction application of force to abutting part 13 and rotor 20 butts.And, if rotate linkedly by the pressing spring bearing part 328 and the rotation of rotor 20, then identical with second embodiment, change with the amount of bow of pressing pressing spring 325 of pressing pressing spring bearing part 328 butts, the pressing force that the abutting part 13 by piezo-activator A is applied on the rotor 20 changes.Therefore, with second embodiment in the same manner, follow the rotation of rotor 20, change from the amplitude of the detection signal of detecting electrode 18 output of piezo-activator A, can use drive amount detecting unit 160 to detect the rotation amount of rotor 20.

In the first embodiment, the new rotor 20 that is provided with respect to rotating shaft eccentric, but rotor 20 on making mostly with respect to some off-centre of turning axle, therefore can use so eccentric a little rotor 20.But, under this situation, because the amplitude variations of detection signal is little, for example, in manufacturing process, but the rotation status of Visual Confirmation rotor 20 or when using rotation sensor etc. to confirm, check the change of the amplitude of detection signal, set the threshold value of waveform shaping circuit 162.

As driven member, be not limited to rotor 20, also can be that slide block of moving of straight line etc. can straight-line moving body.For example, concavo-convex by forming on the slipping plane of moving body (slide block), wherein abutting part 13 slides on this slipping plane, sets the change of pressing force or load torque for, thereby can detect the drive amount of slide block.In addition, preferably can carry out back and forth movement by straight-line moving body (slide block).

And, as second embodiment, it is characterized in that, also can will the application of force unit bearing part of being installed by off-centre with respect to turning axle be set and the structure applications that makes the pressing force change in slide block (moving body).Promptly, as Figure 21, shown in 22, be provided with and press pressing spring bearing part 512 and press pressing spring 325, should press pressing spring bearing part 512 as application of force unit bearing part, in that being set for, slide block 500 can utilize piezo-activator A to slide when mobile along left and right directions, should press pressing spring bearing part 512 rotates with moving linkedly of slide block 500, and installed by off-centre with respect to turning axle, should press pressing spring 325 as application of force unit, with above-mentioned pressing spring bearing part 512 butts of pressing, to at least one side's application of force in slide block 500 and the vibrating mass 12, make slide block 500 and vibrating mass 12 butts, above-mentioned change unit constitutes, have with respect to rotating shaft eccentric ground install above-mentioned by pressing spring bearing part 512.

Herein, slide block 500 shown in Figure 21 is supported to and can utilizes the pilot pin 522 that is formed at thrust slide supporting body 520 to slide along left and right directions (direction of arrow among the figure) to move.It can be that rotate at the center with pin 521 that this thrust slide supporting body 520 is arranged to.And, on thrust slide supporting body 520, be supported to and can rotate freely as the gear (pinion wheel) 510 of breast wheel with these gear 510 meshed gears 511.With second embodiment in the same manner, on gear 511, fixing discoideusly prejudicially by pressing spring bearing part 512, should press pressing spring bearing part 512 and press pressing spring 325 butts.

On the other hand, in the preset range of slide block 500, be formed with the tooth bar 501 that meshes with said gear 510.

And piezo-activator A is identical with piezo-activator A shown in Figure 17, and abutting part 13 is formed on the center of the Width of vibrating mass 12, and is formed with by 5 electrodes of cutting apart 221～223 on the surface.

Like this, as long as on slide block 500, form tooth bar 501, on by pressing spring bearing part 512, gear 511 is set, this gear 511 directly or by breast wheel 510 engages with above-mentioned tooth bar 501, thereby constitute if slide block 500 moves point-blank, then press 512 rotations of pressing spring bearing part and get final product.

In such structure, installed by off-centre with respect to the turning axle of gear 511 by pressing spring bearing part 512, therefore, by making by the rotation linkedly of moving of pressing spring bearing part 512 with slide block 500, can make by the pressing force change that applies by pressing spring 325, according to this change, the output of detection signal also changes, so detect by change, can detect drive amount to detection signal.And,, can easily set the resolution of drive amount detecting unit by the speed ratio of pressing pressing spring bearing part 512 (for example reduction gear ratio) of setting with slide block 500 interlocks.

And slide block 500 shown in Figure 22 is supported to and can utilizes the pilot pin 522 that is formed on the base plate etc., slides at left and right directions (direction of arrow among the figure) and moves, and form tooth bar 501.And, on base plate, be supported to and can rotate freely as the gear (pinion wheel) 510 of breast wheel with these gear 510 meshed gears 511.Identical with second embodiment, on gear 511, fixing discoideus prejudicially by pressing spring bearing part 512.

Press pressing spring bearing part 512 with respect to base plate plate 530 butts slidably.Be separately installed with an end of two springs 531 on the plate 530.The other end of each spring 531 is connected with vibrating mass support plate 532.Vibrating mass support plate 532 is installed into and can slides with respect to base plate.The glide direction of each plate 530,532 is the directions with the moving direction quadrature of slide block 500.

In addition, on plate 530, be formed with a pair of bullport 533 of slotted hole shape, be inserted with in each bullport 533 from the outstanding pin 534 that is provided with of base plate.Equally, on plate 532, also be formed with a pair of bullport 535 of slotted hole shape, be inserted with in the bullport 535 from the outstanding pin 536 that is provided with of base plate.By these pin 534,536 and bullport 533,535, each plate 530,532 is directed, and makes can not tilt with respect to above-mentioned glide direction, can move swimmingly.

On this vibrating mass support plate 532, be fixed with the support 14 of vibrating mass 12, this vibrating mass 12 have with Figure 21 equally by 5 electrodes of cutting apart 221～223, vibrating mass 12 is configured to and can slides integratedly with vibrating mass support plate 532.

In such structure, vibrating mass 12 effect by spring 531 is by the application of force, makes abutting part 13 and slide block 500 side butts.

And, owing to installed by off-centre with respect to the turning axle of gear 511 by pressing spring bearing part 512, so by making by the rotation linkedly of moving of pressing spring bearing part 512 with slide block 500, make plate 530 slide and move, the tensile force of vibrating mass support plate 532 extension spring 531 that to be vibrating mass 12 stretch to slide block 500 laybacks is changed.

Thus, can make the abutting part 13 of vibrating mass 12 push the pressing force change of slide block 500, according to this change, the output of detection signal also changes, and therefore detects by the change to detection signal, can detect drive amount.In addition, by the speed ratio of pressing pressing spring bearing part 512 (for example, reduction gear ratio) of setting, can easily set the resolution of drive amount detecting unit with slide block 500 interlocks.

And, in the present invention, be applied to the pressing force between driven member and vibrating mass, be not limited to give by mechanical hook-ups such as springs, for example can give by the device that utilizes magnetic force etc.

And, as long as the change unit can make the pressing force change, for example be not limited to the device of machinery, also can use the change unit that has utilized electromagnetic force.In a word, as long as set the change unit according to the kind of pressing force.

And, the invention is not restricted in the electronic watch of the respective embodiments described above, use.That is, as the electronic equipment that has adopted drive amout detection device of piezoelectric actuator of the present invention, be not limited to electronic watches such as wrist-watch, desk clock or wall clock, the present invention is particularly suitable for requiring the mobile electronic apparatus of miniaturization applicable to various electronic equipments.As various electronic equipments, can illustration have phone, portable phone, contactless IC card, personal computer, portable data assistance (PDA), camera of clock function etc. herein.And, also go for not having camera, digital camera, the video camera of clock function, the electronic equipments such as portable phone of band camera function.When being used for electronic equipments of these band camera functions, the present invention can be used for the driving of the Focusing mechanism, zoom mechanism, aperture adjusting mechanism etc. of camera lens.The ink gun, supersonic motor etc. of driving mechanism, piezoelectric buzzer, printer of gauge pointer of instrument panel (instrumental panel) that drive amount detecting unit of the present invention can also be used in addition, the driving mechanism, automobile etc. of driving mechanism, touchable toy or the microrobot of the gauge pointer of instrumentation equipment.In a word, applicable to various electronic equipments with the driven member that drives by piezo-activator.

And, in the above-described embodiment, piezo-activator being applied to the driving of the date wheel 50 of electronic watch 1, but being not limited thereto, the moment that also can be used for electronic watch 1 shows the driving of pin (pointer 2).Like this, by the step motor that is generally used for driving pointer is replaced into piezo-activator, can realize the further slimming of electronic watch 1, and compare with step motor, piezo-activator is not vulnerable to effect of magnetic influence, so can realize the high anti-magnetization of electronic watch yet.

And in the structure of machine table, for example doll etc. also can use the drive source of piezo-activator as doll according in the stem-winder that constantly moves.

Be used to implement preferred structure of the present invention, method etc.,, but the invention is not restricted to this as above record institute publicity.Promptly, though being primarily aimed at specific embodiment, the present invention carried out special diagram and explanation, but under the situation that does not break away from technical conceive of the present invention and target zone, for above-mentioned embodiment, shape, material, quantity, and other detailed structure in, those skilled in the art can carry out various distortion.

Therefore, the above-mentioned disclosed narration that defines shape, material etc. is the exemplary description of carrying out for ease of understanding the present invention, be not limitation of the invention, the record of the title of the parts except part or all qualification of qualifications such as these shapes, material also is included in the present invention.

Claims (13)

1. drive amout detection device of piezoelectric actuator, this piezo-activator has: vibrating mass, it vibrates by piezoelectric element being provided the drive signal of preset frequency; And abutting part, it is arranged on this vibrating mass, and with the driven member butt, it is characterized in that,

Described piezoelectric element has: drive electrode, and it is applied in drive signal; And detecting electrode, the vibrational state when its output detection signal, this detection signal vibrate according to drive signal with piezoelectric element is corresponding,

Described drive amout detection device of piezoelectric actuator has:

The change unit, itself and the driving interlock of described driven member change described detection signal; And

The drive amount detecting unit, it detects the drive amount of the driven member that is driven by piezo-activator according to by the variation that produce, described detection signal of described change unit,

The driving interlock of described change unit and described driven member changes the pressing force that is applied between described driven member and the described vibrating mass.

2. drive amout detection device of piezoelectric actuator according to claim 1 is characterized in that,

Described driven member is a rotor,

Described drive amout detection device of piezoelectric actuator has application of force unit, and it makes rotor and vibrating mass butt at least one side's application of force in this rotor and the vibrating mass,

Described change unit is made of the described rotor of being installed by off-centre with respect to turning axle.

3. drive amout detection device of piezoelectric actuator according to claim 1 is characterized in that,

Described driven member is a rotor,

Described drive amout detection device of piezoelectric actuator has application of force unit, and it makes rotor and vibrating mass butt at least one side's application of force in this rotor and the vibrating mass,

Described change unit is by being formed with recess and protuberance at outer peripheral face, making the described rotor of the distance change from the turning axle to the outer peripheral face constitute.

4. drive amout detection device of piezoelectric actuator according to claim 1 is characterized in that,

Described driven member is a rotor,

Described drive amout detection device of piezoelectric actuator has:

Application of force unit bearing part, the rotation of itself and rotor is rotated linkedly, and is installed by off-centre with respect to turning axle; And

Application of force unit, itself and described application of force unit bearing part butt, at least one side's application of force in rotor and the vibrating mass makes rotor and vibrating mass butt,

Described change unit constitutes has the described application of force unit bearing part of being installed by off-centre with respect to turning axle.

5. drive amout detection device of piezoelectric actuator according to claim 1 is characterized in that,

Described driven member is can straight-line moving body,

Described drive amout detection device of piezoelectric actuator has application of force unit, and it makes moving body and vibrating mass butt at least one side's application of force in this moving body and the vibrating mass,

Described change unit constitutes by form irregular described moving body on the vibrating mass bearing surface.

6. drive amout detection device of piezoelectric actuator according to claim 1 is characterized in that,

Described driven member is can straight-line moving body,

Described drive amout detection device of piezoelectric actuator has:

Application of force unit bearing part, itself and moving linkedly of described moving body are rotated, and are installed by off-centre with respect to turning axle; And

Application of force unit, itself and described application of force unit bearing part butt, at least one side's application of force in moving body and the vibrating mass makes moving body and vibrating mass butt,

Described change unit constitutes has the described application of force unit bearing part of being installed by off-centre with respect to turning axle.

7. drive amout detection device of piezoelectric actuator according to claim 1 is characterized in that,

The driving interlock of described change unit and driven member changes the contact angle of the abutting part of driven member and vibrating mass.

8. drive amout detection device of piezoelectric actuator according to claim 7 is characterized in that,

Described driven member is a rotor or can straight-line moving body, and described change unit is made of the groove on the slipping plane that is formed in the driven member, and wherein the abutting part of vibrating mass slides on this slipping plane.

9. drive amout detection device of piezoelectric actuator according to claim 1 is characterized in that,

The driving interlock of described change unit and driven member, the change of load torque.

10. drive amout detection device of piezoelectric actuator according to claim 1 is characterized in that,

Described drive amount detecting unit detects the drive amount of the driven member that is driven by piezo-activator according to the amplitude of the detection signal of being exported by described detecting electrode or the variation of frequency.

11. drive amout detection device of piezoelectric actuator according to claim 1 is characterized in that,

Be provided with driven member, it is followed the driving of described driven member and is driven,

Described drive amount detecting unit detects the drive amount of described driven member by detecting the drive amount of driven member.

12. an electronic equipment is characterized in that possessing:

Piezo-activator;

Driven member, it is driven by this piezo-activator;

And claim 1 is to each described drive amout detection device of piezoelectric actuator of claim 11.

13. electronic equipment according to claim 12 is characterized in that,

Described electronic equipment is the clock and watch that possess as lower unit:

Timing portion;

And the clocking information display part, it shows the clocking information by this institute of timing portion timing.

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