Vibration control apparatus having oscillation frequency regulation

摘要

A vibration control apparatus that can impart self-induced vibration by stabilizing the vibrator at a frequency in near agreement with its mechanical resonance frequency vibration fs is provided. A vibrator has a pair of piezo-electric elements on the side surface of vibration member having a resonance point. A drive apparatus has signal output terminal that outputs the drive signal of vibrator. First and second feedback amplifiers each have feedback input terminals. A third feedback amplifier has a feedback input terminal and a signal input terminal. The feedback input terminals of the first and second feedback amplifiers are connected to one electrode of each of the piezo-electric elements. The feedback input terminal of the third feedback amplifier is connected to the other electrodes of the pair of piezo-electric elements. The signal input terminal is connected to signal output terminal of drive apparatus. A signal based on the output signal of third feedback amplifier is fed back to the drive apparatus to impart self-induced vibration to the vibrator.