Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1993-07-06
1995-05-16
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310316, 310323, 318116, H01L 4108
Patent
active
054163749
ABSTRACT:
An ultrasonic motor comprises a traveling wave generating circuit for generating a traveling wave signal effective to drive a moving member, and a standing wave generating circuit for generating at least one type of standing wave signal effective to stop movement of the moving member. A switching circuit is receptive of the traveling wave signal and the standing wave signal for selecting one of the traveling wave and the standing wave signals as an output signal. A piezoelectric vibrator drive circuit is receptive of the output signal of the switching circuit for producing a high-frequency voltage signal. At least one piezoelectric vibrator includes an electrode pattern and is adapted to be driven by the voltage signal to undergo expansion and compression. A vibrating member is fixed to the piezoelectric vibrator and vibrationally driven by the expansion and compression movement of the piezoelectric vibrator. A moving member is disposed on the vibrating member to be frictionally driven by expansion and compression movement of the piezoelectric vibrator. The moving member is provided with a plurality of load portions for stopping movement of the moving member, the load portions being greater in number than the number of nodes of the standing wave.
REFERENCES:
patent: 4560263 (1985-12-01), Katsuma
patent: 4794294 (1988-12-01), Shimizu et al.
patent: 4954742 (1990-09-01), Izukawa
patent: 5025186 (1991-06-01), Tsukada
patent: 5229678 (1993-07-01), Miyazawa
patent: 5237237 (1993-08-01), Ueda et al.
patent: 5247220 (1993-09-01), Miyazawa et al.
Hayashizaki Shinichi
Inoue Tatsunori
Kasuga Masao
Ozawa Fujio
Suzuki Kenji
Budd Mark O.
Seiko Instruments Inc.
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