Patent ID: 6494491
Filing Date: 2002-12-17
Classification: B42D,G02B,Y10T

Abstract:
An object with a surface region that generates an optical effect having the purpose of increasing proof against counterfeit, wherein the surface region that generates the optical effect exhibits at least two image patterns (12, 14) separated distance (d) from each other by means of a transparent layer of material (10) and, upon altering viewing angle (&agr;), the perceived overall image formed by the overlapping of the image patterns (12, 14) is altered, and the distance (d) between the image patterns (12, 14) defined by a thickness of the material layer (10) and distance (a) between two neighboring image elements (16) forming the image patterns (12, 14) are adjusted with respect to each other such that the image patterns (12, 14) exhibit moirÃ© interference effects.