Patent ID: 6204903
Filing Date: 2001-03-20
Classification: G02B,G02F

Abstract:
A reflector having only one or two reflection angles which exhibit maximums in an angle-dependent distribution curve of intensity of reflected light which is generated when light is illuminated from a light source on the surface of the reflector at specific angles,wherein at least one angle exhibiting said maximum deviates by at least 5 degrees from a regular reflection angle with respect to the horizontal plane of the reflector in relation to the incidence angle of the light, and the surface roughness of the reflector is between 200 nm and 1500 nm in terms of a center line average roughness (Ra),wherein the surface part of said reflector is in the shape of similar or congruent triangular prisms, depressions or projections with cross sections, which appear in at least one direction, forming an asymmetric wave, or pyramids, which are arranged in adjacent to each other form slopes on the surface of said reflector, each having i) a bottom length of 10 to 500 .mu.m and ii) an elevation or depression angle of 2.5 to 10 degrees, andwherein the surfaces of said prisms, depressions or projections, or said pyramids are roughened to have a surface roughness of in the range between 200 nm and 1500 nm in terms of a center line average roughness (Ra).