| 摘要 |
PROBLEM TO BE SOLVED: To provide a vibration generator which is activated by always following up a mechanical resonance point. SOLUTION: This vibration generator 1 has a vibration generation part 2 consisting of a magnet 11 fixed loosely with a spring member 12 and an electromagnetic coil 13 and drives the electromagnetic coil 13 in the form of a square wave to obtain a vibrating force. In addition, the vibration generator 1 has a drive control part 10 which performs such a sequential control that the drive voltage of the electromagnetic coil 13 is detected at every specified time and the drive frequency of the coil 13 is heightened when an induced voltage wave-form of the drive voltage rises to the right and the drive frequency of the coil 13 is lowered when the wave-form rises to the left. Thus it is possible to shift the drive frequency of the coil 13 to the resonance frequency of the vibration generation part 2 and, consequently, enable the drive of the coil 13 to always follow up the mechanical resonance point to obtain a significant vibrating force.
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