Patent ID: 6177761
Filing Date: 2001-01-23
Classification: F21K,F21V,H01L,Y10S

Abstract:
In apparatus to extract light from an LED, the combination comprisinga) a cylindrical body consisting of light transmitting material, said body having a cylindrical outer wall,b) a pyramidal body having at least three planar sides and consisting of light transmitting material, said pyramidal body located longitudinally endwise of said cylindrical body, to expose said three or more sides, said planar sides defining planes which intersect said cylindrical body outer wall at curved edges, said cylindrical outer wall terminating at said curved edges,c) LED means located in spaced relation to said pyramidal body, and oriented to transmit light in said cylindrical body and toward said pyramidal body,d) said planes extending upwardly toward an apex that is spaced In a longitudinal direction from the LED means, said planes angled in excess of 45.degree. relative to a lateral plane normal to said longitudinal direction such that essentially all LED light incident on said sides from within the pyramid is extracted.