Piezoelectric dot resonator driven at a harmonic overtone

Details Piezoelectric dot resonator driven at a harmonic overtone Piezoelectric dot resonator driven at a harmonic overtone

1974-12-02

1976-06-01

Budd, Mark O.

Electrical generator or motor structure

Educational or construction units or kits

310 82, 310 96, 310 97, 310 98, H01L 4104, H01L 4118

Patent

active

039612104

ABSTRACT:
A piezoelectric device comprisng a thin plate of a piezoelectric material which has a Poisson's ratio of less than one-third, and has an electrode region and a non-electrode region, wherein the thickness relation between the electode region and the non-electrode region is arranged so that the thickness of the electrode region is smaller than the thickness of the non-electrode region when a value of equations represented by (.pi.p/4)+(4/k.sup.3)cot(.pi.kp/2) Q for the thickness-extensional mode, and (.pi.q/4)+(4/k)cot(.pi. q/2k) Q for the thickness-shear mode is negative respectively for a desired vibratory mode, and that the thickness of the electrode region is larger than the thickness of the non-electrode region when the value of the above equations are positive respectively for a desired thickness vibration mode.

REFERENCES:
patent: 3222622 (1965-12-01), Curran et al.
patent: 3363119 (1968-01-01), Koneval et al.
patent: 3384768 (1968-05-01), Shockley et al.
patent: 3401276 (1968-09-01), Curran et al.

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