Security articles having diffractive surfaces and color shifting backgrounds
AssigneeJDS Uniphase Corporation
InventorsRichard L. Bonkowski, Patrick K. Higgins, Charles T. Markantes, Roger W. Phillips
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Abstract
A security article includes a light transmissive substrate having a first surface and an opposing second surface, with the first surface having an embossed region with an optical diffraction pattern or a holographic image pattern. A color shifting optical coating is formed on the substrate such as on the opposing second surface, with the optical coating providing an observable color shift as the angle of incident light or viewing angle changes. The security article can be used in a variety of applications and products to provide for enhanced security measures such as anticounterfeiting.
Claims6
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 thereon;
- and
- a color shifting optical coating overlying the second surface of the substrate, said optical coating including a polymeric medium and a plurality of color shifting multilayer optical interference flakes dispersed in the polymeric medium.
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 thereon, said substrate having a plurality of color shifting flakes dispersed therein.
Dependencies are inferred from the claim text.