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Fresnel lens with aspiteric grooves

DC
  • US 4,787,722 A
  • Filed: 04/10/1986
  • Issued: 11/29/1988
  • Est. Priority Date: 04/10/1986
  • Status: Expired
First Claim
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1. A Fresnel lens formed of a material capable of transmitting infrared energy rays, the lens comprising:

  • a body, having a grooved surface;

    the grooved surface having a plurality of grooves, which extend to the same depth;

    the grooves being of different widths; and

    a substantial portion of the grooves each individually having a surface formed thereon which is entirely aspherical and differs in contour from the surfaces of the other grooves.

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