Patent ID: 7700199
Filing Date: 2010-04-20
Classification: B29C,B29D,B29K,B29L,G02B,G02F,Y10T

Abstract:
1. A one-piece cylindrical seamless master having: an integral seamless light-shaping diffuser surface on an exterior surface portion thereof, wherein the cylindrical master defines a longitudinal axis and is rotatable thereabout; wherein the surface of light-shaping diffuser has a plurality of microstructures projecting therefrom, said microstructures having irregular lengths in the projecting direction; wherein the seamless master is hollow, longitudinally-elongated and defines an interior circumferential surface; wherein the master, when rotated about its longitudinal axis, is used to produce a seamless light-shaping diffuser; and wherein the seamless master is made of a hard metal.