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Driving method for piezoelectric vibrator, and dust removing device and ultrasonic motor using the driving method

  • US 8,610,331 B2
  • Filed: 10/13/2011
  • Issued: 12/17/2013
  • Est. Priority Date: 11/04/2010
  • Status: Expired due to Fees
First Claim
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1. A driving method for a piezoelectric vibrator comprising a driving piezoelectric element and a detection piezoelectric element formed of the same material as a material of the driving piezoelectric element the driving method comprising:

  • calculating at least one of variations in mechanical resistance of the piezoelectric vibrator and variations in a piezoelectric characteristic of a piezoelectric element; and

    applying an alternating voltage which is adjusted in accordance with the at least one of variations in mechanical resistance of the piezoelectric vibrator and the variations in the piezoelectric characteristic of the piezoelectric element, to thereby adjust an electrical input to the piezoelectric vibrator to suppress variations in vibration amplitude of the piezoelectric vibrator.

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