Patent ID: 7263884

Claim:
A vibration type gyrosensor device including: a cantilevered oscillator having a lower electrode, a piezoelectric film and an upper electrode formed by a thin film forming process on a single-crystal silicon substrate, for detecting the angular velocity by exploiting the piezoelectric effect of said piezoelectric film, wherein, said upper electrode comprises a driving electrode arranged along the length of said oscillator for applying the voltage for causing oscillations of said oscillator, and first and second detection electrodes arranged on both sides of and parallel to said driving electrode and extending along the length of said oscillator without contacting said driving electrode, and given a distance L 1 from the root of the oscillator to the center-of-gravity position of said driving electrode, a distance L 2 from each of the root of the oscillator to the center-of-gravity position of said first detection electrode and the root of the oscillator to the center-of-gravity position of said second detection electrode, the following relationship: 0<(L 2 /L 1 )≦0.75(1) exists.