Color shifting thin film pigments

Details Color shifting thin film pigments Color shifting thin film pigments

1998-11-24

2000-12-05

Spyrou, Cassandra

Optical: systems and elements

Light interference

Produced by coating or lamina

359585, 359588, 359589, G02B 110

Patent

active

061574899

ABSTRACT:
A color shifting multilayer interference film is provided which may be used to produce flakes for use in colorants having color shifting properties. The flakes can be interspersed into liquid media such as paints or inks which can subsequently be applied to objects or papers to achieve color variations upon shifts in angle of incident light or upon shifts in viewing angle. A five layer design of the interference film includes a first absorber layer, a first dielectric layer on the first absorber layer, a reflector layer on the first dielectric layer, a second dielectric layer on the reflector layer, and a second absorber layer on the second dielectric layer. The first and second dielectric layers are formed to have an optical thickness at a design wavelength that provides a color shift as the angle of incident light or viewing changes.

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