Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1994-06-28
1996-07-02
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
H01L 4108
Patent
active
055325394
ABSTRACT:
The present invention relates to a method for the safe oscillation build-up of ultrasonic disintegrators and to a circuitry for carrying-out the method. In particular the present invention is a method and a circuitry substantially irrespective of deviations of the mechanical resonance frequency, with a start/stop generator 8 that periodically blocks the output of the h.f. generator 1 and maintains the blocking for a fixed dead time and then periodically repeats this procedure if during the scanning of a wide frequency band of the h.f. generator 1 the feedback amplitude of the piezo-disc 4 disposed at the ultrasonic transducer 3 falls below the value required for a safe oscillation build-up.
REFERENCES:
patent: 3889166 (1975-06-01), Scurlock
patent: 4277710 (1981-07-01), Harwood et al.
patent: 4641053 (1987-02-01), Takeda
patent: 4864547 (1989-09-01), Krsna
patent: 4879528 (1989-11-01), Gotanda
patent: 4965532 (1990-10-01), Sakurai
patent: 5361014 (1994-11-01), Antone et al.
patent: 5425704 (1995-06-01), Sakurai et al.
DE-Z "radio mentor", Apr. 1965, pp. 280-281.
Budd Mark O.
Dr. Hielscher GmbH
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