Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1990-05-25
1992-06-09
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310340, 310345, 310358, 310359, 29 2535, H01L 4108
Patent
active
051210240
ABSTRACT:
A piezoelectric device operable in the thickness shear vibratory mode, and a method for manufacturing the piezoelectric device. In the piezoelectric device, a rectangular piezoelectric plate is polarized to have its polarization axis inclined to both the long and short sides thereof. This is accomplished by applying a predetermined electric field to the piezoelectric plate in the direction of the long side thereof, after applying a predetermined electirc field to it in the direction of the short side thereof. A pair of electrodes are formed on the piezoelectric plate so that the piezoelectric device is operable in the thickness shear vibration mode.
REFERENCES:
patent: 3593219 (1971-07-01), Tsuchiya
patent: 3650003 (1972-03-01), Toyoshima
patent: 3747176 (1973-07-01), Toyoshima
patent: 3859546 (1975-01-01), Doi et al.
patent: 4365181 (1982-12-01), Yamamoto
patent: 4418299 (1983-11-01), Momosoki
patent: 4714848 (1987-12-01), Chen
patent: 4920296 (1990-04-01), Takahashi et al.
U.S. patent application Ser. No. 07/376,598, Jul. 7, 1989, H. Takahashi.
European Search Report.
Budd Mark O.
Dougherty Thomas M.
Murata Manufacturing Co. Ltd.
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