Patent ID: 6417831
Filing Date: 2002-07-09
Classification: F21S,F21V,F21Y,G02B,G02F

Abstract:
A diffused light controlling optical sheet made of a light-transmissive material, wherein one face of the optical sheet is used as a light receiving surface of a plane shape and the other face of the optical sheet is used as a light outputting surface and provided with a plurality of convex parts, said convex part is provided with side faces extending from the top to the base, each of said side faces of said convex part being a plane making an angle of 60 to 90 degrees with said light receiving surface, at least one of said light-transmissive material, said side surface is provided with a light diffusing means including a portion with a fine material at the face of the optical sheet with a plurality of convex parts for converting a light inputted through said light receiving surface into a diffused light of intense directivity and outputting the diffused light through the light outputting surface, and said fine material is in particle diameter more than 0.5 &mgr;m and less than 10 &mgr;m.