Energy-trapping-by-frequency-lowering-type piezoelectric resonan

Details Energy-trapping-by-frequency-lowering-type piezoelectric resonan Energy-trapping-by-frequency-lowering-type piezoelectric resonan

1988-12-29

1990-07-03

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310358, 310366, 310359, H01L 4108

Patent

active

049394037

ABSTRACT:
An energy trapping type piezoelectric resonance device utilizing higher-order harmonics of the thickness extensional vibration mode comprising a body formed of a piezoelectric material and three or more electrodes arranged overlapping with each other and separated by the piezoelectric material layers in the direction of thickness of the body, wherein respective portions of the piezoelectric material layers interposed between the electrodes are polarized and at least respective portions of the piezoelectric material layers which are not interposed between the electrodes is polarized.

REFERENCES:
patent: 3590287 (1971-06-01), Berlincourt
patent: 3961210 (1976-06-01), Nagata et al.
patent: 4564782 (1986-01-01), Ogawa
patent: 4605876 (1986-08-01), Ogawa et al.
patent: 4649313 (1987-03-01), Ogawa et al.
patent: 4652784 (1987-03-01), Inoue et al.
patent: 4714848 (1987-12-01), Chen
patent: 4742264 (1988-05-01), Ogawa

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