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Multifocal optical device with novel phase zone plate and method for making

  • US 4,995,714 A
  • Filed: 12/22/1989
  • Issued: 02/26/1991
  • Est. Priority Date: 08/26/1988
  • Status: Expired due to Term
First Claim
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1. A diffractive multifocal optical element comprising a phase zone plate of a Cohen lens design containing rotationally symmetrical, curved repetitive patterns designed to operate at a specific wavelength and which are also curved in r2 space.

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