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Optical encoders using non-patterned targets

  • US 6,246,050 B1
  • Filed: 03/08/1999
  • Issued: 06/12/2001
  • Est. Priority Date: 03/08/1999
  • Status: Expired due to Fees
First Claim
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1. A method of using a photosensor as an encoder for determining an amount of movement of a target of a machine, a surface of the target having a plurality of natural surface features, the method comprising:

  • using the photosensor to image the natural surface features of the target, the photosensor generating a sequence of data frames of imaged areas; and

    processing the data frames of the imaged areas to detect the amount of movement of the target.

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