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Optical assembly and apparatus employing same using an aspherical lens and an aperture stop

  • US 5,291,008 A
  • Filed: 01/10/1992
  • Issued: 03/01/1994
  • Est. Priority Date: 01/10/1992
  • Status: Expired due to Term
First Claim
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1. An optical apparatus, comprising:

  • light sensing means for detecting indicia, said light sensing means having an active viewing surface;

    a single element field corrected lens means, disposed between said light sensing means and said indicia, having an optical axis and a radial dimension that is orthogonal with said optical axis; and

    an aperture stop means spaced apart form said lens means for constraining light beams originating from respective first and second regions of the indicia and reaching first and second regions of said active viewing surface to traverse first and second exclusive portions of said lens means;

    whereby light beams originating from all points on said indicia focus onto said active viewing surface.

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