Piezoelectric ultrasonic transducers having acoustic impedance-m

Details Piezoelectric ultrasonic transducers having acoustic impedance-m Piezoelectric ultrasonic transducers having acoustic impedance-m

1984-03-16

1985-06-11

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310335, 310336, 310327, 367152, 73644, H01L 4108

Patent

active

045231222

ABSTRACT:
Ultrasonic transducers comprising an ultrasonic transducer element, a pair of electrodes provided on opposite sides of the element, and an acoustic impedance-matching layer formed on an ultrasonic wave-radiating surface of the element through one electrode. The acoustic impedance-matching layer is made of a porous polymer film or a composite material comprising thermally expanded resin microspheres dispersed in a cured product of thermosetting resin and has an acoustic impedance not larger than 0.6.times.10.sup.6 Ns/m.sup.3. Two-layer constructions may also be used as the acoustic impedance-matching layer.

REFERENCES:
patent: 3394586 (1968-07-01), Cross
patent: 3663842 (1972-05-01), Miller
patent: 3674945 (1972-07-01), Hands
patent: 3678737 (1972-07-01), Miller
patent: 3732444 (1973-05-01), Miller
patent: 3883841 (1975-05-01), Norel et al.
patent: 4211948 (1980-07-01), Smith et al.
patent: 4366406 (1982-12-01), Smith et al.
Fukumoto et al., "National Technical Report", vol. 29, No. 1(1983), p. 179.

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