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Rotation angle detector

  • US 7,154,263 B2
  • Filed: 11/29/2005
  • Issued: 12/26/2006
  • Est. Priority Date: 01/12/2005
  • Status: Expired due to Fees
First Claim
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1. A rotation angle detector, comprising:

  • a rotator that rotates in engagement with an object;

    a first detector that rotates in engagement with the rotator;

    a second detector that rotates in engagement with the first detector;

    a first rotation-detecting section for detecting a rotation of the first detector;

    a second rotation-detecting section for detecting a rotation of the second detector;

    an auxiliary detector that rotates in engagement with the rotator;

    an auxiliary rotation-detecting section for detecting a rotation of the auxiliary detector; and

    a controller for detecting the rotation angle of the rotator from detecting signals fed from the first rotation-detecting section and the second rotation-detecting section, wherein, the first detector, the second detector, and the auxiliary detector each rotate at a different speed, the controller receives each detecting signal from i) the first rotation-detecting section and the second rotation-detecting section;

    ii) the second rotation-detecting section and the auxiliary rotation-detecting section; and

    iii) the first rotation-detecting section and the auxiliary rotation-detecting section to calculate at least two tentative values for the rotation angle, the controller employs the detecting signal received from the first rotation-detecting section and the second rotation-detecting section for detecting the rotation angle of the rotator when the calculated values are within a predetermined range.

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