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Optical system for scanning and reading barcodes with manually controlled scan beam length

  • US 5,440,111 A
  • Filed: 06/30/1994
  • Issued: 08/08/1995
  • Est. Priority Date: 02/07/1991
  • Status: Expired due to Fees
First Claim
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1. In a bar code scanner which has a motor, a source providing an optical beam and means driven by said motor for scanning the beam across a code, a system for controlling a motor to vary a distance across the code over which the beam is scanned which comprises:

  • means for driving said motor with first control signals operative to provide a marker beam that is indexed at an initial location at a point or area on the code where said marker beam is located on the code by visual observation;

    manual control means for generating multi bit digital second control signals which increase said distance such that said marker beam becomes a variable scan length scanning beam which scans across the codes with a generally constant velocity to illuminate said code to provide light which is returned from said code corresponding thereto; and

    means for obtaining signals corresponding to data represented by said code from said light which is returned from said code.

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