Rotation detector
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United States of America Patent
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May 7, 2013
Grant Date -
Apr 14, 2011
app pub date -
Sep 15, 2010
filing date -
Oct 13, 2009
priority date (Note) -
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Abstract
A rotation detector includes a first distance sensor disposed to face a rotating body with a gear portion formed non-parallel to a rotation axis for continuously measuring a distance from the gear portion during rotation of the rotating body, a second distance sensor disposed at a position different from the first distance sensor in a direction of the rotation axis for continuously measuring a distance from the gear portion during rotation of the rotating body, and an axis shift detecting portion for detecting an axis shift of the rotation axis based on a variation in the distance measured by at least one of the first and second distance sensors.
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