Patent ID: 8113051

Claim:
An angular velocity measuring device comprising: an oscillator having a predetermined mass and capable of oscillating at a predetermined oscillation frequency; a displacement measuring means for measuring a displacement of the oscillator caused by Coriolis force acting on the oscillator; an external force generating means for generating an external force to be exerted on the oscillator; a repetitive control system for controlling the external force generating means so that an output of the displacement measuring means is reduced to zero by repetition control at a time equal to the reciprocal of the predetermined oscillation frequency; and wherein the repetitive control system include a first delay circuit for delaying an output by a time equal to ¼ of the reciprocal of the predetermined oscillation frequency, a second delay circuit for delaying an output signal by a time equal to ¾ of the reciprocal of the predetermined oscillation frequency, and an output means for giving an output of the first delay circuit to the external force generating means.