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Optical device for LED-based lamp

  • US 8,075,147 B2
  • Filed: 09/12/2008
  • Issued: 12/13/2011
  • Est. Priority Date: 05/13/2003
  • Status: Active Grant
First Claim
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1. An optical device for use in distributing radiant emissions, the optical device comprising:

  • lower transfer section comprising an expanding portion and an contracting section, wherein the expanding portion expands with a progressively decreasing angle of expansion in a direction from an inlet end towards the contracting section, and the contracting section contracts with a progressively increasing angle of contraction in a direction from the expanding portion towards an outlet end; and

    an upper ejector section optically cooperated with the outlet end of the contracting section of the lower transfer section, said lower transfer section operable for placement of the inlet end upon a light emitter and operable to transfer radiant emission to said upper ejector section, said upper ejector section comprising a diffusive layer on the ejector section.

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