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Optical character reader

  • US 4,809,351 A
  • Filed: 12/11/1986
  • Issued: 02/28/1989
  • Est. Priority Date: 06/07/1985
  • Status: Expired due to Fees
First Claim
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1. A method for scanning a pattern of optical information on a surface, comprising:

  • projecting a plurality of first imaging elements along a line onto the surface;

    projecting at least two second imaging elements onto the surface alongside the line of first imaging elements;

    moving the first and second imaging elements laterally of the line in a scanning direction across the pattern;

    sensing an optical state of the second imaging elements;

    detecting a change in the optical state of the second imaging elements corresponding to relative movement between the second imaging elements and the pattern;

    calculating an average rate of the relative movement;

    generating a signal in accordance with the detected change in optical state of the second imaging elements;

    in response to the signal, sensing at periodic intervals corresponding to the calculated average rate of movement an optical state of the first imaging elements corresponding to a portion of the pattern along the line;

    detecting a uniform optical state of the second imaging elements; and

    initiating the sensing of optical state of the first imaging elements at the periodic intervals so long as the uniform state continues to be detected.

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