Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1986-01-30
1986-11-25
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310365, 310366, 310369, H01L 4108
Patent
active
046251383
ABSTRACT:
An improvement in piezoelectric crystal resonators using lateral excitation whereby energy of vibration trapped in a region between the electrodes is provided by the inclusion of recessed electrodes adjacent a relatively raised piezoelectric region on at least one major face or surface of the crystal. The recessed electrodes oppose one another in either a horizontal or a vertical direction to generate a lateral field in the body of the crystal upon excitation. Additionally, curved edge interfaces are provided between the recessed electrodes and the piezoelectric crystal material to reduce field gradients. Tapered electrodes which have the effect of increasing the energy trapping in the gap between the electrodes are also disclosed.
REFERENCES:
patent: 3165651 (1965-01-01), Bechmann
patent: 3202846 (1965-08-01), Ballato et al.
patent: 3363119 (1968-01-01), Koneval et al.
patent: 3531742 (1970-09-01), Saito et al.
patent: 3576453 (1971-04-01), Mason
patent: 3585418 (1971-06-01), Koneval
patent: 3872411 (1975-03-01), Watanabe et al.
patent: 3891872 (1975-06-01), Nagata et al.
patent: 3961210 (1976-06-01), Nagata et al.
patent: 4166230 (1979-08-01), Luft
patent: 4384232 (1983-05-01), Debely
patent: 4388548 (1983-06-01), Vangheluwe
Trans. of the IECE of Japan, vol. E61, No. 11, Nov., 1978, pp. 915-916, "A iTaO.sub.3 Monolithic Crystal Filter by Parallel Field Excitation", T. Uno--Discloses typical trapped energy mode resonator.
Technical Research Centre of Finland, Pub. 25, "Influence of Tolerances on Acoustic Bulk Wave . . . ", Bertil Godenhielm, 1979, 45 pp.--Discloses use of tapered electrodes for enhancement of energy trapping.
Budd Mark O.
Lane Anthony T.
Murray Jeremiah G.
Rehberg John T.
The United States of America as represented by the Secretary of
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