Patent ID: 6241903
Filing Date: 2001-06-05
Classification: G02B

Abstract:
A method of making a non-Lambertian diffuser, the method comprising the steps of:providing a substrate body having at least a first side;selecting an etching agent;mixing a plurality of solid particles with the acid agent to form a working compound, each of the plurality of particles having a size, a shape and a mass;placing the etching agent on the first side of the substrate body for an etching time duration; andetching a plurality of irregularities into the first side, the plurality of irregularities having at least a size, a depth and a contour formed according to a reaction between the substrate body and the etching agent and according to the etching time duration to thereby form a diffuser surface on the first side having light propagation characteristics defined by the size, depth and contour of the irregularities.