Piezoelectric resonator

Details Piezoelectric resonator Piezoelectric resonator

1999-04-26

2000-12-19

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310320, 310344, H03H 917

Patent

active

061631019

ABSTRACT:
A piezoelectric resonator includes two sealing substrates, a seal portion, and an energy-trap type piezoelectric resonance element which is adapted to vibrate in a third harmonic of thickness extensional vibration. The piezoelectric resonance element includes a piezoelectric substrate and a pair of excitation electrodes, which are disposed on opposite major surfaces of the piezoelectric substrate. A portion of the piezoelectric substrate sandwiched by the excitation electrodes defines a vibrating portion. The sealing substrates each have a cavity formed therein and are attached onto the corresponding major surfaces of the piezoelectric substrate such that the cavities define a space for vibration. The seal portion is formed around the vibration space so as to damp leaking vibration. The vibrating portion is arranged such that the approximate center thereof is spaced from the approximate center of the vibration space as viewed along the major surfaces of the piezoelectric resonance element.

REFERENCES:
patent: 4633124 (1986-12-01), Kawashima
patent: 5184043 (1993-02-01), Yoshinaga
patent: 5589724 (1996-12-01), Satoh et al.
patent: 5839178 (1998-11-01), Yoshida et al.

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