Patent ID: 7401516

Claim:
A vibration gyro sensor element comprising: (a) a substrate with an opening therein; and (b) a cantilever vibrator formed on an extended portion of the substrate which extends into said opening along a longitudinal direction of the vibrator from a remainder of the substrate but with one end fixed to the remainder of the substrate, the cantilever vibrator having a lower electrode on the extended portion of the substrate; a piezoelectric thin film on the lower electrode; a drive electrode on the piezoelectric thin film and first and second detection electrodes on the piezoelectric thin film, wherein, said vibration gyro sensor element is configured to detect an angular rate using a piezoelectric effect of the piezoelectric thin film; a voltage applied to the drive electrode causes the cantilever vibrator to vibrate, the first and second detection electrodes extend in the longitudinal direction of the vibrator in parallel to each other and the drive electrode such that the drive electrode is positioned between the first and second detection electrodes and does not come into contact with the detection electrodes, the extended portion of the substrate can be ground by a laser light irradiation based on detection signals detected in the first and second detection electrodes when there is a difference between the detection signals detected in the first and second detection electrodes, the detection signals can be obtained when a voltage is applied between the lower electrode and the drive electrode to allow the cantilever vibrator to vibrate at a vertical resonance frequency.