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Low inertia frame for detecting coriolis acceleration

  • US 8,141,424 B2
  • Filed: 09/12/2008
  • Issued: 03/27/2012
  • Est. Priority Date: 09/12/2008
  • Status: Active Grant
First Claim
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1. A gyroscope comprising:

  • an oscillating proof mass for generating a torque in response to angular velocity;

    a sensing frame coupled to the oscillating proof mass, wherein the sensing frame moves in response to the torque, the sensing frame comprising;

    a base;

    a first rail;

    constrained to move along a first axis parallel to the base;

    a second rail substantially parallel to said first rail;

    said second rail constrained to move along the first axis;

    at least two guiding arms ensuring the first rail and the second rail to move in anti-phase fashion along the first axis;

    a first guiding arm flexibly coupled to the first rail and flexibly coupled to the second rail;

    a second guiding arm flexibly coupled to the first rail and flexibly coupled to the second rail;

    the first guiding arm flexibly suspended to the base at a first anchoring point allowing rotation of the first guiding arm around a second axis that is perpendicular to the first axis and normal to the plane;

    the second guiding arm suspended to the base at a second anchoring point allowing rotation of the second guiding arm around a third axis parallel to the second axis;

    a plurality of coupling flexures connecting said sensing frame to the oscillating proof mass; and

    a transducer for sensing motion of the rails along the first axis responsive to said angular velocity.

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