Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1996-04-02
1998-06-02
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
H02N 200, H01L 4108
Patent
active
057605289
ABSTRACT:
An ultrasonic actuator is capable of moving one-dimensionally or two-dimensionally on a flat plane, and can easily be assembled in a cylindrical portion such as a lens barrel of a camera. This ultrasonic actuator comprises a frame-like elastic member having an outer form in a regular square, and electro-mechanical converting elements which are joined to frame side portions of the elastic member for generating vibrations in a longitudinal vibration mode and a bending vibration mode in response to a drive signal so as to generate elliptic motion at predetermined positions in the frame side portions by a synthetic motion of the above-mentioned vibrations. The ultrasonic actuator can translate one-dimensionally or two-dimensionally on the flat plane upon application of a driving voltage onto each group of the opposed electro-mechanical converting elements.
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Dougherty Thomas M.
Nikon Corporation
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