Patent ID: 8136398

Claim:
A vibration gyro sensor, comprising: a vibration element including a piezoelectric element group which has (a) a first side provided with a drive electrode and detection electrodes and (b) a second side opposed to the first side and provided with a common electrode, the vibration element vibrating due to application of a drive signal and generating an output signal containing a detection signal corresponding to Coriolis force from the detection electrodes; bias means to apply a bias voltage to the detection electrodes; an oscillation circuit configured to output a signal for causing vibration of the vibration element and apply the signal for causing vibration as input to the drive electrode as the drive signal based on the output signal generated by the detection electrodes; and a phase inversion circuit configured to receive input from the oscillation circuit and output an inversion signal, said inversion signal being obtained by inverting a phase of the signal output from the oscillation circuit and apply the inversion signal as input to the common electrode, wherein, the vibration element includes a base vibration body in which conductive plating is provided as an exterior surface of each side of the base vibration body, and the conductive plating is the common electrode of the piezoelectric element group.