Piezoresonator with a built-in capacitor and a manufacturing met

Details Piezoresonator with a built-in capacitor and a manufacturing met Piezoresonator with a built-in capacitor and a manufacturing met

1994-02-17

1995-08-29

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310320, 310366, H03H 915

Patent

active

054463351

ABSTRACT:
A piezoresonator which has, on a piezoelectric substrate, a plurality of oscillation sections and a coupling capacitor section for electrically connecting the oscillation sections with each other. The piezoelectric substrate is polarized, while the portion holding the coupling capacitor section is partly left unpolarized. Alternatively, the piezoelectric substrate is entirely polarized such that the portion holding the coupling capacitor section has a lower intensity of polarization than the rest of the substrate. The polarization is carried out, for example, in the following process: first, a direct voltage is applied to the entire piezoelectric substrate so as to polarize the substrate entirely with a high intensity; and then, a direct voltage with the inverse polarity of the former direct current is applied only to the portion holding the coupling capacitor section so as to lower the intensity of polarization of the portion.

REFERENCES:
patent: 3596212 (1971-07-01), Pinner
patent: 3659123 (1972-04-01), Oya
patent: 4013982 (1977-03-01), Wood et al.
patent: 4109359 (1978-08-01), Cross et al.
patent: 4384229 (1983-05-01), Inoue et al.
patent: 4503352 (1985-03-01), Inoue
patent: 4511202 (1985-04-01), Kasai
patent: 4714848 (1987-12-01), Chen
patent: 4833430 (1989-05-01), Roberts et al.
patent: 5184043 (1993-02-01), Yoshinaga
patent: 5310511 (1994-05-01), Marcus

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