Electrical generator or motor structure – Educational or construction units or kits
Patent
1974-10-10
1976-06-29
Budd, Mark O.
Electrical generator or motor structure
Educational or construction units or kits
318116, 331116R, H01L 4104
Patent
active
039671437
ABSTRACT:
The ultrasonic wave generator of the present invention always drives a transducer with the resonant frequency f.sub.o of the transducer. Although the resonant frequency f.sub.o changes due to the temperature change etc., the driving frequency automatically follows the change of the resonant frequency f.sub.o. The control of the driving frequency is performed by means of a feed-back loop including a voltage controlled oscillator and means for applying a control signal to said voltage controlled oscillator according to the amplitude and/or phase of the driving signal of the transducer.
REFERENCES:
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patent: 3296511 (1967-01-01), Van Der Burgt et al.
patent: 3447051 (1969-05-01), Attwood et al.
patent: 3629726 (1971-12-01), Popescue
patent: 3668486 (1972-06-01), Silver
patent: 3809977 (1974-05-01), Balamuth
patent: 3813616 (1974-05-01), Antonevich
patent: 3819961 (1974-06-01), Prudent et al.
patent: 3842340 (1974-10-01), Brandquist
Ando Takao
Nagano Akio
Tanoshima Katsuhide
Tohama Akira
Watanabe Akinori
Budd Mark O.
Oki Electric Industry Company, Ltd.
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