Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1984-08-24
1988-09-13
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310327, H01L 4108
Patent
active
047712058
ABSTRACT:
An ultrasound transducer, comprising a substrate (10) which forms a backing medium, a layer of piezoelectric material (20), and one or more matching layers (30, 40) whose acoustic impedance has a value between that of the piezoelectric material and that of a foremost, propagation medium (50). The matching layer (layers) is (are) provided exclusively between the piezoelectric material (20) and the foremost, propagation medium (50). The acoustic impedance of the backing medium (10) is sufficiently high with respect to the acoustic impedance of the piezoelectric material for the backing medium to be considered to be rigid, the thickness of the layer of piezoelectric material (20) being equal to one quarter of the wavelength associated with the resonant frequency of the transducer.
REFERENCES:
patent: 2427348 (1947-09-01), Bond et al.
patent: 3946149 (1976-03-01), White
patent: 4166967 (1979-09-01), Benes
patent: 4297607 (1981-10-01), Lynnworth et al.
patent: 4383194 (1983-05-01), Ohigashi et al.
patent: 4434384 (1984-02-01), Dunnrowicz et al.
patent: 4507582 (1985-03-01), Glenn
Budd Mark O.
Haken Jack E.
U.S. Philips Corporation
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