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Improved bar code reader system for reading bar codes under high specular reflection conditions with a variety of surface effects

  • US 5,149,948 A
  • Filed: 07/16/1990
  • Issued: 09/22/1992
  • Est. Priority Date: 07/16/1990
  • Status: Expired due to Term
First Claim
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1. An improved bar code reader system for reading bar codes having a wide range of intensity of reflected radiation, comprising:

  • means for repeatedly scanning a beam of radiation across a bar code containing bar and space code elements;

    means for monitoring the number of scans of the beam across the bar code;

    means for sensing the radiation reflected from the bar code and providing a bar code signal representative thereof;

    means, responsive to the means for sensing, for amplifying said bar code signal at a selected one of a number of prespecified gains; and

    means, responsive to said means for monitoring, for selecting one of said prespecified gains for each scan of the bar code, where the gain selected is associated with a given scan of the bar code.

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