Piezoelectric actuating device

Details Piezoelectric actuating device Piezoelectric actuating device

1989-03-22

1989-11-28

Gellner, Michael L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310332, 354457, G03B 708, H01L 4108

Patent

active

048840904

ABSTRACT:
A piezo-electric actuating device employing a piezo-electric element as an actuating member wherein a sufficient amount of movement of a driven member such as a shutter of a camera can be assured. The piezo-electric element of the device includes a first piezo-electric member which is contracted when a first voltage of a first polarity is applied thereacross and which is elongated when a second voltage of a second polarity opposite to the first polarity is applied thereacross, and a second piezo-electric member which is contracted when the second voltage is applied thereacross and which is elongated when the first voltage is applied thereacross. The piezo-electric member is deformed to move a driven member in one or the other when the first or second voltage is applied thereto, and the first and second piezo-electric members have a higher yield strength against deformation thereof by application of the first voltage than by application of the second voltage.

REFERENCES:
patent: 4234245 (1980-11-01), Toda et al.
patent: 4349762 (1982-09-01), Kitamura et al.
patent: 4609275 (1986-09-01), Ishiguro
patent: 4786930 (1988-11-01), Suzuki et al.
patent: 4791442 (1988-12-01), Touma et al.

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