Ultrasonic transducer

Details Ultrasonic transducer Ultrasonic transducer

1988-06-02

1989-01-03

Chapman, John

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

73644, 310800, G01K 1102, H01L 4104

Patent

active

047959355

ABSTRACT:
An ultrasonic transducer includes a piezoelectric body having a reflector and an acoustic matching layer deposited on the opposing surfaces thereof. The piezoelectric body is constituted by a piezoelectric member exhibiting an acoustic impedence of from 2.5.times.10.sup.6 to 15.times.10.sup.6 kg/m.sup.2 s, and the reflector has a thickness of less than .lambda..sub.2 / 4, where .lambda..sub.2 represents the wavelength of sound in the reflector at a frequency which is one half the free resonance frequency of the piezoelectric body. The acoustic matching layer includes a material exhibiting an acoustic impedance of from 1.6.times.10.sup.6 to 4.times.10.sup.6 kg/m.sup.2 s and has a thickness of from .lambda..sub.3 /8 to 28 .lambda..sub.3 /120, where .lambda..sub.3 represents the wavelength of sound in the acoustic matching layer at a frequency which is one half the free resonance frequency of the piezoelectric body.

REFERENCES:
patent: 4296349 (1981-10-01), Nakanishi et al.
patent: 4383194 (1983-05-01), Ohigashi et al.
patent: 4523122 (1985-06-01), Tone et al.

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