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ROTATION DETECTOR

  • US 20110084691A1
  • Filed: 09/15/2010
  • Published: 04/14/2011
  • Est. Priority Date: 10/13/2009
  • Status: Active Grant
First Claim
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1. A rotation detector, comprising:

  • 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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