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Aspherical lens with grating

  • US 7,082,000 B2
  • Filed: 06/07/2004
  • Issued: 07/25/2006
  • Est. Priority Date: 06/06/2003
  • Status: Active Grant
First Claim
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1. An aspherical lens comprising a first aspherical surface, an opposite second substantially flat surface, and a grating defined in the second surface;

  • wherein the grating has “

    n”

    sections of uniform length, and a stepped structure comprising a plurality of steps is defined along each section.

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