Patent ID: 7569807
Filing Date: 2009-08-04
Classification: F21K,F21V,G01J,G02B,H05B,Y02B

Abstract:
1. A light source comprising: a substantially planar light guide comprising one or more in-coupling portions and one or more out-coupling portions; one or more light-emitting elements, each configured to emit light about a respective optical axis and disposed such that an axial component thereof is at least partially directed toward the output of the light source and such that a radial component thereof is at least partially coupled into said substantially planar light guide via said one or more in-coupling portions; and one or more photosensors optically coupled to said one or more out-coupling portions for use in controlling the output of each of said one or more light-emitting elements based on out-coupled light sensed thereby, wherein at least one of said one or more in-coupling portions comprises an in-coupling edge portion, said in-coupling edge portion at least partially circumscribing at least one of said light-emitting elements.