Diffractive surfaces with color shifting backgrounds

Details Diffractive surfaces with color shifting backgrounds Diffractive surfaces with color shifting backgrounds

G - Physics

02

B

G02B 5/28 (2006.01) B42D 15/10 (2006.01) G02B 1/10 (2006.01) G02B 5/18 (2006.01)

Patent

CA 2599246

A security article (10) includes a light transmissive substrate (14) 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 (15). A color shifting optical coating (16) 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.

L'invention porte sur un article de sécurité (10) comprenant un substrat transmetteur de lumière (14) muni d'une surface primaire et d'une surface secondaire en regard, la première surface comportant une zone en relief munie d'un motif de diffraction optique ou d'un patron d'image holographique (15). Un revêtement optique de couleur changeante (16) est formé sur le substrat (c.-à-d. sur la surface secondaire en regard), ledit revêtement ayant un effet optique variable selon l'angle de la lumière incidente ou son angle d'observation. Cet article de sécurité peut être utilisé dans un éventail d'applications et de produits destinés à fournir des moyens de détection sophistiqués de la contrefaçon.

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