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Optical waveguide and luminaire incorporating same

  • US 9,389,367 B2
  • Filed: 07/10/2013
  • Issued: 07/12/2016
  • Est. Priority Date: 01/30/2013
  • Status: Active Grant
First Claim
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1. An optical waveguide, comprising:

  • a body of optically transmissive material comprising a width substantially greater than an overall thickness thereof and comprising a first side, a second side opposite the first side, an interior coupling cavity extending between the first and second sides and adapted to receive a light emitting diode, and extraction features on the second side;

    wherein the extraction features direct light out of at least the first side and wherein at least one extraction feature comprises an extraction feature depth extending from the second side toward the first side that is between about 5% and about 75% of the overall thickness of the body of material and is defined by first and second surfaces that are disposed at different angles relative to the first side;

    wherein at least one extraction feature is disposed in a ring extending at least partially around the interior coupling cavity; and

    wherein the extraction features comprise a first extraction feature disposed at a first distance from the interior coupling cavity and a second extraction feature disposed at a second distance from the interior coupling cavity, wherein the first extraction feature comprises a first tapered extraction surface and the second extraction feature comprises a second tapered extraction surface, and wherein the first tapered extraction surface and the second tapered extraction surface are disposed at different angles with respect to the first side.

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