Piezoelectric ultrasonic transducer with resonator laminate

Details Piezoelectric ultrasonic transducer with resonator laminate Piezoelectric ultrasonic transducer with resonator laminate

1979-09-13

1981-08-11

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310322, 310345, 17910A, H01L 4108

Patent

active

042836492

ABSTRACT:
An ultrasonic transducer comprises a composite vibrator, which comprises a bimorph vibrator and a resin made additional resonator of a frustum of a cone provided at the central portion of the bimorph vibrator. The composite vibrator gives rise to the first resonance by a piston vibration mode at the lower frequency region and the second resonance by a bending vibration mode at the higher frequency region as compared with the central frequency. The composite vibrator is fixed to an insulating base through a ring shaped elastic member, whereby a resonance characteristic by virtue of a piston vibration mode is enhanced. Preferably a protrusion of the diameter slightly smaller than the nodal circle by virtue of a bending vibration mode is formed on the transducing surface of the resin made additional resonator of a frustum of a cone. The protrusion serves to reduce the quality factor of the second resonance by virtue of a bending vibration mode.

REFERENCES:
patent: 3675053 (1972-07-01), Mifune

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