Patent ID: 9645122
Date: 2017-05-09
CPC Classifications: B06B,G01N,G01P,H03B

Claim:
1. A vibration generation apparatus for driving a test body to vibrate in response to a PWM drive signal, the vibration generation apparatus comprising: a pair of electrodes for inputting the PWM drive signal to the test body; a drive part outputting, as the PWM drive signal, a high level signal and a low level signal to the pair of electrodes, the high level signal and the low level signal having potentials higher and lower than a potential of a reference signal, respectively; and a phase difference detection part for detecting a phase difference between a waveform phase of the PWM drive signal and a vibration phase of the test body, wherein the drive part outputs the high level signal and the low level signal to one and the other of the pair of electrodes, respectively, and wherein the drive part outputs a phase-adjusted drive signal so that the phase difference becomes a predetermined phase difference.