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Illumination apparatus for optical readers

  • US 5,623,137 A
  • Filed: 03/30/1995
  • Issued: 04/22/1997
  • Est. Priority Date: 08/20/1993
  • Status: Expired due to Fees
First Claim
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1. An apparatus for illuminating a sensing region located in an object plane, comprising:

  • a housing having a median longitudinal plane and a scanning axis disposed in a scanning plane;

    a reflector mounted within said housing for reflecting light directed thereagainst toward the sensing region, said reflector having a first curvilinear profile in a plane parallel to said scanning plane and a second curvilinear profile in a plane parallel to said median longitudinal plane, said reflector being elongated generally along said scanning axis and having a central portion, two end portions, and a focal line connecting a plurality of focal points, the central portion of said reflector defining an opening for the passage of light from said sensing region through said reflector; and

    a plurality of sources of substantially Lambertian illumination disposed in said focal line for directing light against the reflector.

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