Reciprocation type linear driving actuator and power toothbrush using the same
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United States of America Patent
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-
Jan 6, 2009
Grant Date -
Feb 22, 2007
app pub date -
May 14, 2004
filing date -
May 16, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
In a reciprocal linear driving actuator used as a drive source of a power toothbrush, two permanent magnets are formed substantially disc shape or substantially tubular shape, and fitted to and fixed on a shaft directly or via a spacer with a predetermined distance in axial direction of the shaft, so that a moving object is constituted by the shaft and the permanent magnets. On the other hand, a tubular shaped stator, which is constituted by a coil wound around a bobbin and stationary yokes and so on, is provided to face side faces of the permanent magnets of the moving object via a predetermined clearance so that a center axis thereof becomes coaxial with the center axis of the shaft. By supplying alternating current to the coil, the moving object is driven reciprocally and linearly in the axial direction of the shaft.
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