Piezoelectric vibrator capable of reliably preventing dielectric

Details Piezoelectric vibrator capable of reliably preventing dielectric Piezoelectric vibrator capable of reliably preventing dielectric

1992-09-17

1994-05-24

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310328, 310331, 310366, H01L 4104

Patent

active

053152050

ABSTRACT:
On a first piezoelectric sheet of a piezoelectric vibrator, a second piezoelectric sheet is stacked with interposition, between the sheets, of first-set electrodes (24(1), 24(2)) formed on an upper surface of the first piezoelectric sheet. Second-set electrodes are formed on an upper surface of the second piezoelectric sheet with each placed halfway between two adjacent ones of the first-set electrodes. The second piezoelectric sheet is poled in directions from each second-set electrode to the two adjacent ones of the first-set electrodes. Preferably, third-set electrodes are formed on a lower surface of the first piezoelectric sheet with each arranged halfway between two adjacent ones of the first-set electrodes. In this event, the first piezoelectric sheet is poled in directions from each third-set electrode to two adjacent ones of the first-set electrodes. Each first-set electrode has a first end along a side surface of the first piezoelectric sheet with each second-set and each third-set electrode possessed of a second and a third end along opposite side surfaces of the first and the second piezoelectric sheets. First and second common outside electrodes are formed on such side surfaces in contact with the first end of each first-set electrode either directly or through a first common electrode and in contact with the second and the third ends of the second-set and the third-set electrodes either directly or through second and third common electrodes.

REFERENCES:
patent: 3175107 (1965-03-01), Brussaard et al.
patent: 4376302 (1983-03-01), Miller
patent: 4692652 (1987-09-01), Seki et al.
patent: 4780639 (1988-10-01), Shinasu
Patent Abstracts of Japan, vol. 15, No. 277 (E-1089), Jul. 15, 1991 & JP-A-30 94 487 (Murata Mfg. Co., Ltd.) Apr. 19, 1991.
Patent Abstracts of Japan, vol. 12, No. 304 (E-646), Aug. 18, 1988 & JP-A-63 072 172 (NGK Spark Plug Co.).
Patent Abstracts of Japan, vol. 12, No. 304 (E-646), Aug. 18, 1988 & JP-A-63 972 171 (NGK Spark Plug Co.).

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