Patent ID: 7806579
Filing Date: 2010-10-05
Classification: G02B

Abstract:
1. A luminaire comprising: a waveguide having first and second opposing ends and first and second substantially parallel opposing sides between the first and second opposing ends, the waveguide being configured to receive and internally reflect light having a first property and being devoid of a second property propagating from the first end to the second end on a first pass and direct at least a portion of the light propagating from the second end to the first end on a second pass with the second property through at least one of the first and second opposing sides; and an optical modifier coupled to the second end of the waveguide and configured to reflect and modify the light propagating towards the second end of the waveguide such that the light propagates towards the first end of the waveguide with the second property, wherein the extraction material comprises an extraction layer and an adhesive layer, the adhesive layer interconnecting the extraction layer and the waveguide such that the interface is formed between the adhesive layer and the waveguide, and wherein the adhesive layer comprises adhesive material portions and air gap portions, a ratio of an area of the adhesive material portions to an area of the air gap portions increasing as a function of distance from the optical modifier.