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Lighting apparatus having low profile

DC CAFC
  • US 6,473,554 B1
  • Filed: 09/24/1997
  • Issued: 10/29/2002
  • Est. Priority Date: 12/12/1996
  • Status: Expired due to Term
First Claim
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1. An illumination device, comprising:

  • a waveguide having an illumination coupler embedded in an interior region of said waveguide, said illumination coupler adapted to receive light from a point source within said interior region, and to direct light between generally parallel top and bottom surfaces outside said interior region, said illumination coupler comprising a refractive index interface which is inclined relative to at least one of said top and bottom surfaces said interface being configured to reflect light rays emitted by the point source which propagate along a line that forms less than the critical angle of total internal reflection with respect to a line lying in one of said top and bottom surfaces, such that light rays which would otherwise pass out of said waveguide are captured for propagation between said top and bottom surfaces.

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