Patent ID: 7224528
Filing Date: 2007-05-29
Classification: B32B,B42D,G03H,Y10T

Abstract:
1. A security article comprising: a substrate; a diffractive grating having a grating pattern directly on the surface of the substrate or upon a coating adjacent to the substrate; an optically variable coating directly on the diffractive grating so that a layer of the optically variable coating adjacent to the diffractive grating conforms to the grating pattern and whereby the grating pattern is replicated into the optically variable coating, wherein the optically variable coating includes an absorber layer, a dielectric layer and a reflector layer for providing an observable color shift as the angle of incident light or viewing angle changes whereby, when the article is irradiated with light, a first visual effect is produced by incident light reflecting from the optically variable coating, a second visual effect is produced by incident light diffracting from the diffractive grating, and a third visual effect is produced by an interaction between light reflecting from the optically variable coating and light diffracted from the diffractive grating.