Patent ID: 7906920
Filing Date: 2011-03-15
Classification: B06B,F04B,H02K,H02P

Abstract:
1. A vibration generator comprising: an oscillator including a permanent magnet generating a stationary magnetic field; a holding member for holding the oscillator based on a static magnetic force due to the stationary magnetic field between the oscillator and the holding member, the holding member including a permanent magnet or a magnetic body, so that the holding member holds the oscillator at a stable position due to the static magnetic force, the oscillator being capable of vibrating relative to the holding member about the stable position, the static magnetic force defining a resonance period of vibration of the oscillator about the stable position relative to the holding member; and an electromagnetic coil fixed to the holding member, wherein, when a periodic current is not supplied to the electromagnetic coil, the oscillator remains stationary at the stable position, when the periodic current is supplied to the electromagnetic coil, the oscillator vibrates about the stable position relative to the holding member so as to synchronize with the period of the periodic current, and resonates by synchronizing the period of the periodic current with the resonance period.