Tuning fork gyroscope
First Claim
1. A gyrometer, comprising:
- a micro-machined sensitive element with at least two symmetrically positioned excitation beams on each side of and parallel to a sensitive Oy axis of the gyrometer, excited in bending about an Ox axis perpendicular to the sensitive Oy axis, and connected at their ends through at least one transverse element fixed in its central part to the sensitive Oy axis, to a frame through an elastic torsion return element acting in opposition to rotation of the transverse element about the Oy axis, wherein the elastic return element is sized such that a variation of its resonant natural frequency in torsion with temperature is similar to a variation of a resonant natural frequency in bending of the beams with temperature.
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Accused Products
Abstract
Diapason type gyrometers using a micro-mechanical structure of vibrating beams. The gyrometer includes a micro-machined sensitive element with at least two symmetrically positioned excitation beams on each side of and parallel to a sensitive Oy axis of the gyrometer. The two beams are connected at their ends through at least one transverse element fixed in its central part to the sensitive Oy axis, to a frame through an elastic torsion return element acting in opposition to the rotation of the transverse element about the Oy axis. The elastic return elements are sized such that the variation of their resonant natural frequency in torsion with temperature is similar to the variation of the resonant natural frequency in bending of the beams with temperature. Such a device may find particular application in the measurement of the angular velocity of a mobile.
30 Citations
14 Claims
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1. A gyrometer, comprising:
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a micro-machined sensitive element with at least two symmetrically positioned excitation beams on each side of and parallel to a sensitive Oy axis of the gyrometer, excited in bending about an Ox axis perpendicular to the sensitive Oy axis, and connected at their ends through at least one transverse element fixed in its central part to the sensitive Oy axis, to a frame through an elastic torsion return element acting in opposition to rotation of the transverse element about the Oy axis, wherein the elastic return element is sized such that a variation of its resonant natural frequency in torsion with temperature is similar to a variation of a resonant natural frequency in bending of the beams with temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification