Patent ID: 9182531
Filing Date: 2015-11-10
Classification: G02B

Abstract:
1. A surface light guide comprising: two mutually opposite main sides, an end side designed as light entrance side, a main light guiding direction running away from the light entrance side, and a scattering element in the form of particles and configured to scatter light, wherein a coupling-out coefficient caused by the scattering element is set in a varying fashion along the main light guiding direction, wherein, in each case in a direction perpendicular to one of the main sides: wherein the surface light guide has a rectangular cross section and exactly one basic molding compound in which the scattering element is present and distributed inhomogeneously in a targeted manner so that a concentration of the scattering element is the highest in a central region of the surface light guide and the lowest in corner regions of the surface light guide as seen in a plan view, wherein the main sides are each planar and smooth at least in the emission region so that there is at most one constriction that is located in a center of the surface light guide when seen in top view, and wherein an angle between the main sides is between 0.5 degrees and 4.0 degrees inclusive.