Piezoelectric shear resonator, composite piezoelectric shear...

Details Piezoelectric shear resonator, composite piezoelectric shear... Piezoelectric shear resonator, composite piezoelectric shear...

2005-11-22

2005-11-22

Budd, Mark (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S320000, C310S366000, C310S368000

Reexamination Certificate

active

06967432

ABSTRACT:
A piezoelectric shear resonator has a substantially rectangular-column piezoelectric element that excites a shear-vibration mode and that has opposing substantially rectangular shear strain surfaces. The shear strain surfaces each have an aspect ratio at which the electromechanical coupling factor reaches substantially a maximum value. When the vertical dimension of the shear strain surfaces is D and the horizontal dimension thereof is Le, the aspect ratio Le/D is expressed by Le/D={α·(S44E/S33E)1/2+β}±0.3, where S44Eand S33Eare elastic compliances, α=0.27·n+0.45, β=1.09·n+0.31, and n is a positive integer.

REFERENCES:
patent: 3955109 (1976-05-01), Comparini et al.
patent: 6717335 (2004-04-01), Nishimura et al.
patent: 5-243889 (1993-09-01), None
patent: 7-147527 (1995-06-01), None
patent: 7-226647 (1995-08-01), None

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