Patent ID: 7667895
Filing Date: 2010-02-23
Classification: B42D,B44F,G02B,G03H,G07D

Abstract:
1. An optical structure comprising: a substrate having a first surface and an opposing second surface, the second surface having a surface relief pattern formed thereon; one or more layers of different materials supported by the second surface of the substrate, at least one of the one or more layers having the surface relief pattern formed therein, wherein one of the one or more layers is deposited so as to form a pattern of windowed and non-windowed regions formed therein such that the layer material is absent in the windowed regions and present in the non-windowed regions, wherein at least one of the one or more layers form an optically active color-shifting coating, wherein the color-shifting coating has a visibly changing color with a change in viewing angle or a change of angle of incident light and wherein different optical effects are seen when viewing the optical structure through the windowed and non-windowed regions, wherein at least one of the different optical effects is a diffractive or thin-film interference effect and another optical effect is a combined thin-film interference effect and a diffractive effect.