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

1989-12-21

1991-09-03

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310365, 310366, 310359, H01L 4108

Patent

active

050457446

ABSTRACT:
Disclosed is an energy-trapping-by-frequency-lowering-type piezoelectric-resonance device utilizing a higher harmonic in the mode of thickness-extensional vibration, in which at least three electrodes for energy trapping are arranged so as to be overlapped with each other in the direction of thickness of layers of piezoelectric material forming a plate-shaped body. The three electrodes comprise a pair of outermost electrodes and at least one inner electrode. The diameter of one polygonal side of at least one outermost electrode is made larger than the diameter of one polygonal side of an inner electrode.

REFERENCES:
patent: 3401377 (1968-09-01), Bartlett et al.
patent: 3733590 (1973-05-01), Kaufman
patent: 4218631 (1980-08-01), Yamaguchi
patent: 4876476 (1989-10-01), Kittaka et al.
patent: 4918350 (1990-04-01), Ando et al.
patent: 4939403 (1990-07-01), Kittaka et al.

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