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Piezoelectric vibration angular velocity meter and camera using the same

  • US RE42,923 E1
  • Filed: 05/26/2006
  • Issued: 11/15/2011
  • Est. Priority Date: 08/31/1994
  • Status: Expired due to Term
First Claim
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1. An angular velocity meter comprising:

  • a vibrator anda self-excitation driving circuit for driving said vibrator in a self-excitation manner,said self-excitation driving circuit comprising;

    a converting means for converting a first sine wave voltage indicative of a state of vibration of said vibrator into a square wave voltage which becomes a first predetermined level when said first square sine wave voltage is greater than a predetermined reference level while becoming a second predetermined level when said first square sine wave voltage is smaller than said predetermined reference level;

    a filter for filtering a second sine wave voltage, which has a frequency identical to a frequency of said first sine wave voltage, from said square wave voltage; and

    a phase shifter for adjusting a phase of said second sine wave voltage, which has been filtered by said filter, such that an amplitude of vibration of said vibrator is substantially maximized.

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