Optical element employing aspherical and binary grating optical surfaces

  • US 5,044,706 A
  • Filed: 02/06/1990
  • Issued: 09/03/1991
  • Est. Priority Date: 02/06/1990
  • Status: Expired due to Term
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First Claim
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1. An optical element for reducing aberration in an optical system, said optical element having first and second surfaces, said first surface being an aspherical surface and said second surface being a diffractive surface and, wherein said second surface is a binary grating surface including a plurality of concentric rings, each ring having a series of phase level steps for approximating a Kinoform profile.

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