Method for pulse triggering of a piezo-electric sound-transmitti

Details Method for pulse triggering of a piezo-electric sound-transmitti Method for pulse triggering of a piezo-electric sound-transmitti

1981-02-18

1983-03-08

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310316, H01L 4108

Patent

active

043762557

ABSTRACT:
A piezoelectric ultrasonic transducer is triggered by a predeflection of the transducer in a first direction with a square-wave pulse or a saw-tooth pulse which has a rapidly dropping trailing edge to effect deflection in the opposite direction, with an overshoot. At the maximum point of overshoot, an alternating triggering voltage, preferably in the form of a pulse sequence, is applied to energize and maintain the transducer in resonance oscillation.

REFERENCES:
patent: 2398701 (1946-04-01), Firestone
patent: 2651012 (1953-09-01), Valkenburg et al.
patent: 2949028 (1960-08-01), Joy
patent: 3828357 (1974-08-01), Koeblitz
patent: 4195243 (1980-03-01), Thaxter
patent: 4282452 (1981-08-01), Hassler et al.

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