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Diffuse bright field illumination system for a barcode reader

  • US 8,857,720 B1
  • Filed: 10/24/2013
  • Issued: 10/14/2014
  • Est. Priority Date: 10/24/2013
  • Status: Active Grant
First Claim
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1. A barcode reader, comprising:

  • a housing;

    a camera located within the housing configured to capture an image of a barcode within a field of view of the camera, the field of view being directed along an optical axis; and

    an illumination system configured to illuminate the barcode while the camera captures the image of the barcode, the illumination system comprising;

    at least one light source; and

    an optical substrate, not within the field of view of the camera, having front and back major surfaces arranged generally perpendicular to the optical axis, and between which light introduced from the at least one light source is transferred by total internal reflection primarily in a direction transverse to the optical axis,wherein the optical substrate comprises one or more extraction features configured to extract light from the optical substrate and into the field of view.

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