Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1993-07-06
1994-09-27
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310320, 310333, H03H 917, H01L 4108
Patent
active
053509650
ABSTRACT:
A piezoelectric resonator vibrating in the thickness shear-slide mode comprises an elongated ceramic piezoelectric substrate, first and second terminal electrodes formed on both end portions of a front major surface thereof and first and a second vibrating electrodes connected with the first and the second terminal electrodes through first and second extracting electrodes respectively. A third terminal electrode is formed on a central portion of a rear major surface of the substrate, while a third vibrating electrode is formed at a position opposite to the first and the second vibrating electrodes, so that the third terminal electrode is connected with the third vibrating electrode through a third extracting electrode. An auxiliary electrode extends from the third vibrating electrode toward a position opposed to the first terminal electrode. An overlap area of the auxiliary electrode and the first terminal electrode is substantially equal to that of the second extracting electrode and the third terminal electrode. Thus, stray capacitance between the first and the third terminal electrodes and that between the second and the third terminal electrodes are balanced such that the piezoelectric resonator becomes electrically nonpolarized.
REFERENCES:
patent: 3676724 (1972-07-01), Berlincourt et al.
patent: 3970880 (1976-07-01), Deutschmann et al.
patent: 4066986 (1978-01-01), Takano et al.
patent: 4642505 (1987-02-01), Arvanitis
patent: 4833430 (1989-05-01), Roberts et al.
patent: 5166570 (1992-11-01), Takahashi et al.
Noto Kazuyuki
Yosinaga Takasi
Dougherty Thomas M.
Myrata Manufacturing Co., Ltd.
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