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Drive apparatus of piezoelectric actuator, electronic apparatus, drive method of electronic apparatus, drive control program of electronic apparatus, and medium

  • US 7,675,218 B2
  • Filed: 03/10/2005
  • Issued: 03/09/2010
  • Est. Priority Date: 03/10/2004
  • Status: Expired due to Fees
First Claim
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1. A piezoelectric actuator drive apparatus for driving a piezoelectric actuator having a vibrating body that vibrates due to application of a drive signal having a prescribed drive frequency to a piezoelectric element, said piezoelectric actuator driving a driven member, said piezoelectric actuator drive apparatus comprising:

  • driving means for supplying said drive signal to the piezoelectric element of said vibrating body;

    vibration state detection signal outputting means for outputting a vibration state detection signal that indicates vibration state of said vibrating body;

    phase correcting means for correcting a phase of said vibration state detection signal to corrected phase, on the basis of voltage of said vibration state detection signal;

    phase difference detection means for detecting phase difference between said phase of drive signal and said corrected phase;

    comparison means for comparing said phase difference with a target phase difference which is a target to optimize said vibration state at which the vibrating body is efficiently driven; and

    control means for controlling said phase difference to approach said target phase difference by changing said drive frequency.

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