Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1990-04-04
1991-07-02
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313B, 310313C, H01L 4108
Patent
active
050288318
ABSTRACT:
A SAW transducer eliminates mechanical energy reflections by using one-quarter wavelength electrodes spaced at predetermined intervals. Dummy electrodes are shifted one-quarter wavelength to cancel energy reflections in the active electrodes. A pair of dummy electrodes is required for each active set of electrodes (the active set comprises one positive and two negative electrodes).
REFERENCES:
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patent: 4463327 (1984-07-01), Suzuki et al.
patent: 4513262 (1985-04-01), Schofield et al.
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patent: 4575698 (1986-03-01), Schofield
patent: 4616197 (1986-10-01), Wright
patent: 4731595 (1988-03-01), Wright
patent: 4866325 (1989-09-01), Kodama et al.
patent: 4870312 (1989-09-01), LaRosa et al.
"A Directional Surface Wave Transducer", by T. W. Cole, from Monitor-Proceedings of IREE AUST (Australia), Mar. 1978.
Malocha Donald C.
Penunuri David
Bogacz Frank J.
Budd Mark O.
Dougherty Thomas M.
Motorola Inc.
Powell Jordan C.
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