Step motor
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United States of America Patent
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-
Sep 15, 2015
Grant Date -
N/A
app pub date -
Mar 12, 2015
filing date -
Mar 12, 2015
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention relates to a PM (Pulse-Width Modulation) type step motor used for conveying an optical pickup lens of media devices or a mobile camera lens. In detail, the present invention relates to a step motor that is composed of a stator, a rotor rotating by interacting with the stator, a lead screw combined with the rotor and rotating with the rotation of the rotor, and a bearing supporting the lead screw and which can perform precise conveying because it can perform fine adjustment and of which the operation state can be precisely sensed by having a position correcting unit that moves the lead screw to a desired position by finely moving it while contracting and stretching and a rotation sensing unit that is disposed at a side of the rotor or a rotary member rotating with the rotor and senses rotation of the rotor.
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