Patent ID: 6560023
Filing Date: 2003-05-06
Classification: G02B,G02F

Abstract:
A surface light source device composed of a light source for outputting light from its light outputting surface and an optical sheet provided adjacently to said light outputting surface, said optical sheet having one surface of a light-transmissive base material on which at least one of a group of plural unit prisms and a group of plural unit lenses is arranged and the other surface being covered with a coating layer formed out of light-transmissive materials, wherein said coating layer is composed of a light-transmissive resin and light-transmissive fine particles dispersed in said light-transmissive resin, and at least part of said fine particles are formed into many fine knoll-shaped projections of 1 to 10 &mgr;m in height projecting from said surface by being projected from the opposite surface of said coating layer to the light-transmissive base material.