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Hand held symbology reader illumination diffuser

  • US 7,617,984 B2
  • Filed: 12/16/2004
  • Issued: 11/17/2009
  • Est. Priority Date: 12/16/2004
  • Status: Active Grant
First Claim
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1. An apparatus for imaging a symbol on an object, the apparatus comprising:

  • a hand held portable imaging system having an imager;

    a lens disposed between the imager and a region of interest, the region of interest being the intended position of the symbol on the object, the lens and imager defining a field of view and an optical axis;

    an illuminator adjacent to the lens, directing illumination towards the region of interest;

    a tapered translucent diffuser concentrically aligned with the optical axis, having a first distal end surrounding the field of view proximate to the lens, and a second distal end surrounding the field of view proximate to the region of interest;

    a dark field illuminating light pipe concentrically aligned with the optical axis and surrounding the tapered translucent diffuser; and

    a dark field illuminator directing illumination into the dark field illuminating light pipe.

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