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G05D 19/02 (2006.01) G12B 1/00 (2006.01) G12B 7/00 (2006.01) H01L 41/04 (2006.01) H01L 41/08 (2006.01) H04R 3/00 (2006.01)
Patent
CA 1202363
- 25 - Abstract of the Disclosure 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 tem- perature coefficient with the same absolute value but opposite sign to that of the capacitance of the piezo- electric 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.
451008
Ridout & Maybee Llp
Tokyo Shibaura Denki Kabushiki Kaisha
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