Patent ID: 9176268
Filing Date: 2015-11-03
Classification: F21K,F21V,G02B,G09F

Abstract:
1. A surface light source with a lighting surface, the surface light source comprising: a semiconductor body that emits electromagnetic radiation from its front side during operation; wherein the radiation-emitting front side of the semiconductor body is arranged parallel to the lighting surface of the surface light source; wherein the semiconductor body is embedded in a light guide and output coupling structures are arranged on a side of the light guide facing the lighting surface in the region of the radiation-emitting front side of the semiconductor body; wherein the output coupling structures are one or more of cylindrical recesses, pyramidal recesses, conical or frustoconical recesses, cylindrical holes, pyramidal holes, conical or frustoconical holes, and have respective axes of rotation that extend obliquely with respect to the lighting surface, such that, during operation of the surface light source, a variation of a light density is a function of the observation angle and produces a glitter effect in an illumination region on the lighting surface for a human observer; wherein the output coupling structures are arranged centrally over the front side of the semiconductor body, said output coupling structures being configured to produce a local variation of light density on the lighting surface, so that the light density is increased in at least one illumination region with respect to a background region.