To enhance angular speed detection accuracy.
A weight 3 is disposed oppositely to a base 2 through an interval. The weight 3 is supported displaceably by a fixed part 5 through four beams 4. The four beams 4 are arranged such that the angle defined by beams 4a and 4b, and the angle defined by beams 4c and 4d become larger than the angle defined by beams 4a and 4d, and the angle defined by beams 4b and 4c. The weight 3 performs horizontal rotary oscillation about the Z-axis along the surface of the base 2 through a drive means. When the weight 3 rotates about the Y-axis under that oscillatory state, the weight 3 performs rotary oscillation about the X-axis by Coliolis force. Angular speed of rotation about the Y-axis can be detected by detecting that oscillatory state through an electrode 7 for detecting angular speed about the Y-axis. Resonance frequency of horizontal rotary oscillation of the weight 3 and resonance frequency of detected oscillation by Coliolis force can be lowered easily such that they are insusceptible to adverse effect of unnecessary oscillation as compared with resonance frequency of the unnecessary oscillation.
TAMURA MASAYA
KOBAYASHI SHINJI
