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Difractive device

  • US 20040032659A1
  • Filed: 06/20/2003
  • Published: 02/19/2004
  • Est. Priority Date: 07/18/2000
  • Status: Abandoned Application
First Claim
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1. An achromatic diffractive diffuser device comprising a plurality of discrete regions of individual surface relief diffractive devices each of a size below the normal visual resolution of an observer and arranged such that, under illumination by ambient light, the superposition of the diffractive effects serves to provide a uniform achromatic diffuse reflection into a defined viewing zone for observation by an observer.

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