Covert security coating

Details Covert security coating Covert security coating

G - Physics

02

B

G02B 5/20 (2006.01) B42D 15/10 (2006.01) B44F 1/12 (2006.01) G02B 1/04 (2006.01) G02B 5/22 (2006.01) G02B 5/26 (2006.01)

Patent

CA 2550190

A multilayer thin film filter is disclosed an organic dielectric layer serving as a spacer layer in a Fabry-Perot structure. The dielectric has embossed regions of varying thicknesses wherein the thickness within a region is substantially uniform. Each different region of a different thickness produces a different color (shift). The size of one of the embossed adjacent regions is such that the color of said one region is uniform and cannot be seen by a human eye as different in color from the uniform color of an adjacent region thereto, and wherein the color within a region can be seen with magnification of at least 10:1. This serves as a covert color coding system useful as a security device.

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