Patent ID: 8033171
Filing Date: 2011-10-11
Classification: G01C

Abstract:
1. A detection apparatus, comprising: a cantilever vibration gyro including a piezoelectric element which has a first side and a second side, the first side provided with a drive electrode and a pair of detection electrodes, the pair of detection electrodes consisting of a first detection electrode and a second detection electrode, the drive electrode disposed between the pair of detection electrodes with predetermined gaps, the second side opposed to the first side and provided with a common electrode, the cantilever vibration gyro vibrating by a drive signal input between the drive electrode and the common electrode and generating a first detected signal from the first detection electrode and a second detected signal from the second detection electrode corresponding to Coriolis force from the pair of detection electrodes; bias applying means for applying a bias voltage to the pair of detection electrodes; adding means for adding the first detected signal and the second detected signal to produce an added signal; first phase delaying means for delaying a phase of the added signal by a range larger than 45° and smaller than 90°; amplitude controlling means for controlling the added signal delayed by the first phase delaying means to a predetermined voltage amplitude and outputting the added signal delayed by the first phase delaying means and amplitude controlling means as the drive signal; and second phase delaying means for delaying a phase of the added signal by a second phase amount of 90°.