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INDEXED OPTICAL ENCODER, METHOD FOR INDEXING AN OPTICAL ENCODER, AND METHOD FOR DYNAMICALLY ADJUSTING GAIN AND OFFSET IN AN OPTICAL ENCODER

  • US 20100057392A1
  • Filed: 08/28/2009
  • Published: 03/04/2010
  • Est. Priority Date: 08/28/2008
  • Status: Abandoned Application
First Claim
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1. An optical encoder comprising:

  • an encoder disk comprising;

    a signal track comprising a diffraction grating formed as a ring on the encoder disk; and

    an index track comprising a reflective index mark, wherein a width of the index mark is larger than a pitch of the diffraction grating;

    an illumination system structured to direct light to the encoder disk; and

    a detector structured to detect light diffracted from the encoder disk.

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