Ultrasonic transducer

Details Ultrasonic transducer Ultrasonic transducer

1980-02-12

1981-10-20

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310326, 310327, 310800, 310334, H01L 4108

Patent

active

042963494

ABSTRACT:
Ultrasonic transducer advantageously usable for diagnostic purpose includes a piezoelectric element such as a PVDF film backed with a reflective layer of a reduced thickness specified in relation to the wavelength of sound waves within the reflective layer at one-half of the free resonant frequency of the piezoelectric element. Remarkable reduction in thickness assures high transfer efficiency, broad available frequency-band and easy application of fine treatments such as etching.

REFERENCES:
patent: 2875354 (1959-02-01), Harris
patent: 3365593 (1968-01-01), Roof et al.
patent: 3798473 (1974-03-01), Murayama et al.
patent: 3801839 (1974-04-01), Yo
patent: 3969927 (1976-07-01), Yoshida et al.
patent: 4184094 (1980-01-01), Kopel

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