Patent ID: 7287892
Filing Date: 2007-10-30
Classification: G02B

Abstract:
1. A light source comprising: a light pipe comprising a two-dimensional sheet of transparent material having a transparent top surface that is substantially parallel to a reflective bottom surface, said light pipe comprising light pipe scattering centers that cause light traveling in said sheet of transparent material to be scattered in directions that allow some of said scattered light to escape said sheet of transparent material through said top surface, wherein a mixing chamber comprises a portion of said sheet of transparent material; and a light generating section comprising a plurality of LEDs and said mixing chamber, said LEDs being positioned to emit light into said mixing chamber, said mixing chamber comprising an adapter comprising a wedge-shaped cavity having reflective walls, said cavity having an opening positioned to direct light into said light pipe and mixing chamber scattering centers for redirecting light traveling in said cavity in directions that would not be obtained by reflection from said reflective walls, wherein a portion of said light directed into said light pipe enters said light pipe at angles at which that light will be reflected from said top and bottom surfaces of said sheet of transparent material back into said sheet of transparent material; wherein said mixing chamber scattering centers comprising scattering centers in said portion of said sheet of transparent material.