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Apparatus for diagonal progressive scanning video and method of improving aiming visibility, reducing tilt dependence and improving read range

  • US 7,407,105 B2
  • Filed: 08/30/2005
  • Issued: 08/05/2008
  • Est. Priority Date: 08/30/2004
  • Status: Expired due to Fees
First Claim
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1. A method for scanning a bar code with a bar code scanner having a three-dimensional (3D) field-of-view encompassing a bar code, comprising:

  • illuminating a bar code with an illumination source having a lighting wavelength and a thin, bright lighting path produced by moving a beam of light;

    embedding said lighting path in a first 3D volume of view of the bar code;

    passing backscattered light from the bar code through a filter centered on the lighting wavelength;

    sensing the light backscattered from the bar code by pixels of an array of pixels illuminated by the backscattered light, each illuminated pixel having a respective pixel height and a respective pixel width;

    artificially reducing the respective pixel height of illuminated pixels in the pixel array to a respective effective pixel height of m*w, where m is the magnification of a lens in a scanner and w is the thickness of the lighting path; and

    decoding the bar code.

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