Piezoelectric bimorph type actuator

Details Piezoelectric bimorph type actuator Piezoelectric bimorph type actuator

1993-02-08

1995-01-17

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310363, H01L 4108

Patent

active

053828640

ABSTRACT:
A piezoelectric bimorph type actuator which, given a constant applied voltage, is capable of greater displacement without suffering from the problem of generating a smaller force of displacement or increasing the actuator size. The piezoelectric bimorph type actuator which is cantilevered, includes an electrode plate, a pair of piezoelectric plates provided on both sides of the electrode plate, and a voltage source for applying a voltage between each piezoelectric plate and the electrode plate so as to displace a free end thereof, wherein a ratio t.sub.2 /t.sub.1 between the thickness t.sub.2 of the electrode plate and the thickness t.sub.1 of each piezoelectric plate is set to be 0.42-1.11 times as much as a ratio E.sub.2 /E.sub.1 between the Young's modulus E.sub.2 of the electrode plate and the Young's modulus E.sub.1 of each piezoelectric plate.

REFERENCES:
patent: 4349762 (1982-09-01), Kitamura et al.
patent: 4363993 (1982-12-01), Nishigaki et al.
patent: 4780062 (1988-10-01), Yamada et al.
patent: 5216315 (1993-06-01), Terada et al.

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