Patent ID: 6761959
Filing Date: 2004-07-13
Classification: B42D,G03H,Y10T

Abstract:
A security article comprising:a light transmissive substrate having a first surface and an opposing second surface, the first surface having a diffraction grating pattern or a holographic image pattern and the second surface being substantially planar; and a color shifting multilayer optical film on the second surface of the substrate, the optical film comprising: an absorber layer on the second surface of the substrate; a dielectric layer on the absorber layer; and a reflector layer on the dielectric layer; wherein the optical film provides an observable discrete color shift such that the article has a first background color at a first angle of incident light or viewing and a second background color different from the first background color at a second angle of incident light or viewing, the article exhibiting an optical diffraction grating pattern effect or a holographic image pattern effect in addition to the first and second background colors.