Piezoelectric drive device and electronic device

A technology of piezoelectric drive and electronic equipment, which is applied in the direction of electric mechanical clocks, electric winding, generators/motors, etc., and can solve the problem of longer acceleration period of the rotor body, longer time, and increased power consumption of the ultrasonic drive device, etc. question

Inactive Publication Date: 2008-09-03
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, when the moment of inertia is large, the acceleration period of the rotor body becomes longer, and the time for applying a drive signal to the vibrating body (vibrator) becomes longer, so there is a problem that the power consumption of the ultrasonic drive device increases.

Method used

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  • Piezoelectric drive device and electronic device
  • Piezoelectric drive device and electronic device
  • Piezoelectric drive device and electronic device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0106] A first embodiment of the present invention will be described below with reference to the drawings.

[0107] In addition, after the second embodiment described later, the same components and components having the same functions as those in the first embodiment described below are assigned the same reference numerals, and descriptions thereof are simplified or omitted.

[0108] (the whole frame)

[0109] 6 and 7 are a perspective view and a plan view showing a driving mechanism of the hands 2 in the timepiece 1 of the present embodiment. The timepiece 1 is equipped with a timing unit inside an unshown exterior case; a timing information display unit for displaying timing information obtained by timing the timing unit with hands 2; institutions, etc., including Figure 8 In the movement mechanism), the piezoelectric drive device 10 is used for the action of the drive mechanism of the pointer 2. That is, the pointer wheel 3 on which the pointer 2 as the object to be driv...

no. 2 approach

[0185] Next, a piezoelectric drive device 10A in a timepiece according to a second embodiment of the present invention will be described with reference to FIGS. 11 to 14 .

[0186] FIG. 11 is a plan view showing a piezoelectric drive device 10A of a timepiece. 12 to 14 are vertical cross-sectional views showing the piezoelectric drive device 10A. Furthermore, FIG. 12 is a cross-sectional view of the transmission path connecting the rotor (rotor ring 30, rotor pinion 32, rotor gear 33), intermediate wheel 6, and rotor drive wheel 5A in FIG. 11. In addition, FIG. 13 is a cross-sectional view of the transmission path connecting the rotor, the pallet fork 8 , and the rotor drive wheel 5A in FIG. 11 . FIG. 14 is a cross-sectional view of the piezoelectric actuator 4A composed of the vibrator 20A and the rotor in FIG. 11 .

[0187] The piezoelectric drive device 10A differs from the piezoelectric drive device 10 of the above-mentioned first embodiment in the following points of st...

no. 3 approach

[0229] Next, a piezoelectric drive device 10B in a timepiece according to a third embodiment of the present invention will be described with reference to FIGS. 15 to 18 .

[0230] FIG. 15 is a plan view showing a piezoelectric drive device 10B in a timepiece. 16 and 17 are vertical cross-sectional views showing the piezoelectric drive device 10B. FIG. 18 is a plan view for explaining the driving of the piezoelectric driving device 10B.

[0231] The piezoelectric drive device 10B is different in structure from the piezoelectric drive device 10A of the above-mentioned second embodiment in that a driven wheel 60B is used as a to-be-rotated body instead of the escape wheel 60A, and a drive wheel is used as a rotation limiting device. 9 instead of pallet fork 8, other structures are roughly the same.

[0232] The piezoelectric drive device 10B is configured to include: an intermediate wheel 6A that rotates while meshing with the rotor ring 30A; a driving wheel 9 that is rotated b...

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Abstract

The invention provides a piezoelectric drive device and electronic equipment, when the piezoelectric drive device drives the rotary body by the vibration of the piezoelectric element, the rotary body can be driven in the low power. The piezoelectric drive device has a piezoelectric actuator (4) having the piezoelectric element (22) and a rotor (30) that is rotated by the piezoelectric element (22); a disk spring (50) for storing the driving force of the piezoelectric actuator as the elastic energy; a second rotor drive gear (60) rotating through the elastic energy stored in the disk spring (50). When the piezoelectric actuator starts, the drive force of the piezoelectric actuator is stored as the elastic energy to be stored, then the second rotor drive gear (60) starts rotating, so the piezoelectric actuator (4) can not bear the load generated by the second rotor drive gear (60), the pointer wheel (3) and the inertial moment of the pointer (2), which reduces the load when starting, thereby driving the piezoelectric actuator in the low power.

Description

technical field [0001] The present invention relates to a piezoelectric drive device and electronic equipment with a piezoelectric driver. Background technique [0002] Conventionally, an ultrasonic drive device using a piezoelectric element that is less susceptible to magnetic fields is known and used as a drive device for driving clock hands and the like of a timepiece (for example, refer to Patent Document 1). [0003] The ultrasonic drive device described in Patent Document 1 is configured to have: a vibrating body to which a piezoelectric element is bonded; a rotor body that rotates in the circumferential direction as the vibrating body vibrates; The pressing spring with a certain pressing force, the clock hands rotate through the rotation of the rotor body. [0004] Patent Document 1: Japanese Patent Application Laid-Open No. 10-290579 [0005] However, in the ultrasonic drive device described in Patent Document 1, when the ultrasonic drive device is started from a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/10G04C3/12
CPCH02N2/101H02N2/123
Inventor 长尾昭一
Owner SEIKO EPSON CORP
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