Drive unit

Details Drive unit Drive unit

2011-08-30

2011-08-30

Rosenau, Derek (Department: 2837)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S323160

Reexamination Certificate

active

08008840

ABSTRACT:
A drive unit which generates less heat may be provided. The drive unit includes a piezoelectric element (P1) having a piezoelectric layer (1), a drive power supply (14) configured to apply a driving voltage at a predetermined frequency to the piezoelectric element (P1) such that vibration including stretching vibration and bending vibration is generated in the piezoelectric element (P1), and a movable element (9) which is movable relative to the piezoelectric element (P1) according to the vibration of the piezoelectric element (P1). The difference between the resonance frequency of the bending vibration of the piezoelectric element (P1) and the anti-resonance frequency of the stretching vibration of the piezoelectric element (P1) is smaller than the difference between the resonance frequency of the bending vibration of the piezoelectric element (P1) and the resonance frequency of the stretching vibration of the piezoelectric element (P1).

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International Search Report for corresponding International Application No. PCT/JP2008/003628 mailed Feb. 24, 2009.
Form PCT/ISA/237 for International Application No. PCT/JP2008/003628 dated Feb. 24, 2009.

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