Thin film optical variable article having substantial color shif

Details Thin film optical variable article having substantial color shif Thin film optical variable article having substantial color shif

1984-07-13

1987-11-10

Arnold, Bruce Y.

Printed matter

Maps

283 91, 283 94, 283902, G02B 528

Patent

active

047053569

ABSTRACT:
Thin film optically variable article having substantial color shift with varying angle of light incidence and viewing and including an optically thick, substantially transparent element carrying a colorant and having first and second surfaces. A multilayer interference coating is carried on one of said first and second surfaces. The colorant serves to modify in essentially a subtractive mode the color at normal incidence and the color shift with angle of the multilayer interference coating as seen by reflection or transmission.

REFERENCES:
patent: 3858977 (1975-01-01), Baird et al.
patent: 4354739 (1982-10-01), Scanlon et al.
patent: 4370025 (1983-01-01), Sato et al.
Dobrowolski, et al.; "Optical Interference Coatings for Inhibiting of Counterfeiting", Optical Acta, 1983, vol. 20, No. 12, pp. 924-937.

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