Patent ID: 6995914
Filing Date: 2006-02-07
Classification: B29D,G02B,Y10S

Abstract:
1. A method of producing a lenticular sheet having anisotropic optical properties comprising the steps of: providing a substrate of transparent material having a first side and a second side and an index of refraction greater than one; and forming at least one lens pattern having a plurality of lenses on the first side of the substrate in pre-selected portions thereof, wherein a desired optical effect is produced in the pre-selected portions only, wherein the remainder of the first side of the substrate is unaltered, wherein the step of forming at least one lens pattern further comprises the steps of: engraving a plate or cylinder with a desired lens pattern; masking desired portions of the engraved plate or cylinder; electroplating the plate or cylinder with a metal; cutting back the electroplated metal to a desired level; removing the masking from the desired lens pattern; and using the resulting plate or cylinder in an extrusion embossment process such that the substrate can be embossed with the remaining lens pattern.