Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1984-03-22
1986-08-26
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310317, 310332, H01L 4108
Patent
active
046085068
ABSTRACT:
A displacement generation device includes: a bimorph piezoelectric vibrator for receiving an externally applied drive voltage and for generating a displacement in response to the drive voltage; and a temperature-compensation capacitor element electrically connected in series with the piezoelectric vibrator. The capacitor element has a capacitance with a temperature coefficient with the same absolute value but opposite sign to that of the capacitance of the piezoelectric vibrator. When the capacitance of the piezoelectric vibrator changes in accordance with a change in the ambient temperature, the capacitor element properly changes the drive voltage supplied to the piezoelectric vibrator, thereby compensating for the displacement of the piezoelectric vibrator caused by the change in ambient temperature.
REFERENCES:
patent: 1840580 (1932-01-01), Heising
patent: 2157665 (1939-05-01), Hollmann
patent: 2166763 (1939-07-01), Mason
patent: 3185869 (1965-05-01), Shoor
patent: 3646413 (1972-02-01), Oomen
patent: 4013845 (1977-03-01), Sugimoto et al.
Budd Mark O.
Tokyo Shibaura Denki Kabushiki Kaisha
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