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Double-ended tuning fork vibratory gyro-sensor

  • US 6,915,694 B2
  • Filed: 09/17/2003
  • Issued: 07/12/2005
  • Est. Priority Date: 09/11/2002
  • Status: Expired due to Term
First Claim
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1. A dual tuning fork vibratory gyro-sensor comprising:

  • a drive section including two arms, wherein each includes surfaces thereon and ends, and drive electrodes formed on said surfaces of said arms;

    a first and a second tuning fork support section supporting said ends of said arms;

    a first and a second detection section connected to said first and said second tuning fork support sections respectively and disposed outside said drive section;

    a first and a second detection electrode formed on said first and said second detection sections respectively; and

    a first and a second support securing section supporting an end of said first and second detection sections;

    wherein said arms and said drive electrodes and said first and said second tuning fork support sections and said first and said second detection sections and said first and said second detection electrodes and said first and said second support securing sections are formed integrally and detect rotational angular velocity;

    when said dual tuning fork gyro-sensor rotates, a Coriolis force acting on said arms causes in-plane asymmetrical flexural secondary mode vibrations to be generated at said arms, said in-plane asymmetrical flexural secondary mode vibrations being transferred to said first and said second detection sections by way of said first and said second dual tuning fork support sections; and

    a detection signal for a rotational angular velocity is output from said first and second detection electrodes.

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