Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1978-06-01
1980-01-15
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
128660, 310327, 310369, 310371, 367152, H01L 4110
Patent
active
041840941
ABSTRACT:
A piezoelectric crystal has a concave active surface and a high acoustical impedance. A flat layer of molded material having a low acoustical impedance faces the active surface of the crystal to form a space therebetween. An intermediate layer of molded material having an intermediate acoustical impedance fills the space between the crystal and the flat layer. Preferably, the intermediate material has a sonic velocity near that of water, and the flat layer has a uniform thickness of approximately 1/4 of the average wavelength of the ultrasonic energy emitted by the crystal. A housing supports the crystal, the flat layer, and the intermediate layer.
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patent: 2565159 (1951-08-01), Williams
patent: 2913602 (1959-11-01), Joy
patent: 3278771 (1966-10-01), Fry
patent: 3663842 (1972-05-01), Miller
patent: 3958559 (1976-05-01), Glenn et al.
patent: 3958559 (1976-05-01), Glenn et al.
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patent: 3979565 (1976-09-01), McShane
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patent: 4016530 (1977-04-01), Goll
patent: 4092867 (1978-06-01), Matzuk
ZnO Film Concave Transducer for Focusing Microwave Ultrasound, by N. Chubachi, Electronics Letters, vol. 12, No. 22, pp. 595-596, Oct. 1976.
Advanced Diagnostic Research Corporation
Budd Mark O.
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