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Portable reader system having an adjustable optical focusing means for reading optical information over a substantial range of distances

  • US 5,811,828 A
  • Filed: 06/05/1997
  • Issued: 09/22/1998
  • Est. Priority Date: 09/17/1991
  • Status: Expired due to Term
First Claim
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1. A portable optical reader system for reading optical information over a substantial range of distances, comprising:

  • (a) a casing having a light receiving opening for alignment with optical information to be read;

    (b) optical means comprising reflected light collecting means for forming a reflected light image and reading sensor means for converting a reflected image of optical information into an information signal, said optical means being adjustable such that said collection means tends to focus a reflected light image of optical information located within said substantial range of distances onto said reading sensor means;

    (c) light beam generating means associated with said casing and directed relative to said optical means and said light receiving opening such that a light beam generated thereby will impinge on an information carrier having optical information to be read and will be reflected therefrom through said light receiving opening and via said collecting means to said reading sensor means, the position of impingement of the reflected light beam on said reading sensor means being a function of the range of the information carrier from said image sensor; and

    (d) control means for adjusting said optical means to tend to focus a reflected light image of optical information associated with the information carrier at least in part in accordance with the position of impingement of the reflected light beam on said reading sensor means.

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