Vibration actuator
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United States of America Patent
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May 30, 2017
Grant Date -
Jul 23, 2015
app pub date -
Jan 20, 2015
filing date -
Jan 21, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A vibration actuator includes: a movable element having a magnet that is supported to be rotatable around a shaft, a weight supported to be rotatable together with the magnet, and an elastic supporting member wherein a rotation of the magnet and the weight is supported elastically; a coil that is supplied with an AC current at a frequency that is equal to a resonant frequency of the movable element; and a magnetic pole member that causes the movable element to undergo reciprocating a rotational vibration around the shaft through applying rotational torques in different directions alternatingly to the magnet by changing magnetic poles through the AC current that is applied to the coil.
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