Vibration generator using rotary bodies having unbalanced weights, and vibratory stimulating apparatus using same vibration generator

A vibration generator using rotary bodies having unbalanced weights, comprising:

• two spaced non-contacting rotary bodies having unbalanced weights disposed in out of phase relation with respect to each other;
• driving means for rotating said rotary bodies;
• single-element detectable members on said rotary bodies in predetermined positional relation with respect to said rotary weights;
• rotation detectors mounted in fixed positions proximate the loci of rotational movements of said detectable members and adapted to output pulse signals when detectable members pass a respective relative rotation detector, so that a pulse signal is outputted for each revolution of a rotary body;
• phase difference computing means connected to said rotation detectors for computing a phase difference between said unbalanced weights on said two rotary bodies in response to said signals from said rotation detectors and outputting a phase difference signal;
• and
• rotation controlling means connected to said phase difference computing means and said rotary body driving means and adapted to control said rotary body driving means in response to said phase difference signal from said phase difference computing means so that said phase difference signal reaches a predetermined level.