Electrically induced mechanical precompression of ferroelectric

Details Electrically induced mechanical precompression of ferroelectric Electrically induced mechanical precompression of ferroelectric

1987-03-02

1987-12-22

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310358, 29 2535, 361225, H01L 4108, H04R 1700

Patent

active

047148489

ABSTRACT:
A method of electrically inducing mechanical precompression of a ferroelectric plate covered with electrodes utilizes the change in strains of the plate as functions of applied electric field. A first field polarizes and laterally shrinks the entire plate. An outer portion of the electrodes are removed, and an opposite field partially depolarizes and expands the central portion of the plate against the shrunk outer portion.

REFERENCES:
patent: 2633543 (1953-03-01), Howatt
patent: 3374367 (1968-03-01), Cowan
patent: 3950659 (1976-04-01), Dixon et al.
patent: 3958161 (1976-05-01), Dixon
patent: 4087716 (1978-05-01), Heywang
patent: 4160184 (1979-07-01), Ljung
patent: 4633204 (1986-12-01), Gounji et al.

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