Piezoelectric actuator, timepiece, and electronic device
AssigneeSeiko Epson Corporation
InventorsJoji Kitahara, Shigeaki Seki
Life of this patent
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Abstract
A piezoelectric actuator A has an oscillator 10 that has a flat base layer 32 and piezoelectric elements 30, 31 layered on the base layer 32 and oscillates as a result of a drive signal applied to the piezoelectric elements 30, 31, and a rotor 100 driven by vibrations from the oscillator 10. The piezoelectric actuator A includes a fastening part 11 for securing the oscillator 10, and lead substrates 14A, 14B that are secured to the fastening part 11 for applying a drive signal to the piezoelectric elements from a drive circuit 500 for driving the piezoelectric elements 30, 31. The lead substrates 14A, 14B have connecting parts 17A–17C extending to the power supply electrodes 33A, 33C and a detection electrode 34.
Claims9
A piezoelectric actuator having an oscillator that has a flat base layer and a piezoelectric element layer on the base layer, and the oscillator vibrates as a result of a drive signal applied to the piezoelectric element layer, and a driven member that is driven by vibration of the oscillator, the piezoelectric actuator comprising:
- a fastening part that secures the oscillator;
- and
- a lead substrate secured to the fastening part for applying a drive signal from a drive circuit for driving the piezoelectric element layer;
- wherein the lead substrate has a conductive member that extends to an electrode on the piezoelectric element layer;
- and
- wherein the conductive member is formed as a conductive elastic member that applies pressure to the electrode.
A piezoelectric actuator having an oscillator that has a flat base layer and a piezoelectric element layer on the base layer, and the oscillator vibrates as a result of a drive signal applied to the piezoelectric element layer, and a driven member that is driven by vibration of the oscillator, the piezoelectric actuator comprising:
- a fastening part that secures the oscillator;
- and
- a lead substrate secured to the fastening part for applying a drive signal from a drive circuit for driving the piezoelectric element layer;
- wherein the lead substrate has a conductive member that extends to an electrode on the piezoelectric element layer;
- and
- wherein:
- the lead substrate comprises a metal layer and an insulation layer or insulation sheet covering a surface of the metal layer;
- and
- the conductive member is a spring connected to or integrally formed with the metal layer.
A piezoelectric actuator having an oscillator that has a flat base layer and a piezoelectric element layer on the base layer, and the oscillator vibrates as a result of a drive signal applied to the piezoelectric element layer, and a driven member that is driven by vibration of the oscillator, the piezoelectric actuator comprising:
- a fastening part that secures the oscillator;
- and
- a lead substrate secured to the fastening part for applying a drive signal from a drive circuit for driving the piezoelectric element layer;
- wherein the lead substrate has a conductive member that extends to an electrode on the piezoelectric element layer;
- and
- further comprising a height adjusting member between the lead substrate and fastening part so that the conductive member extending from the lead substrate is higher than the piezoelectric element layer.
Dependencies are inferred from the claim text.