Methods of fabricating color shifting thin film pigments
First Claim
1. A method of fabricating a color shifting multilayer interference film, comprising the steps of:
- providing a web material with a release layer formed on an upper surface thereof;
forming a first absorber layer on the release layer;
forming a first dielectric layer on the first absorber layer;
forming a reflector layer on the first dielectric layer;
forming a second dielectric layer on the reflector layer;
forming a second absorber layer on the second dielectric layer to produce the interference film; and
removing the interference film from the web material;
wherein the first and second dielectric layers have an index of refraction of greater than 1.65 and an optical thickness at a design wavelength that provides a discrete color shift such that the film has a first color at a first angle of incident light or viewing and a second color different from the first color at a second angle of incident light or viewing.
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Accused Products
Abstract
Methods for fabricating a color shifting multilayer interference film are provided. The interference film 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.
97 Citations
20 Claims
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1. A method of fabricating a color shifting multilayer interference film, comprising the steps of:
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providing a web material with a release layer formed on an upper surface thereof;
forming a first absorber layer on the release layer;
forming a first dielectric layer on the first absorber layer;
forming a reflector layer on the first dielectric layer;
forming a second dielectric layer on the reflector layer;
forming a second absorber layer on the second dielectric layer to produce the interference film; and
removing the interference film from the web material;
wherein the first and second dielectric layers have an index of refraction of greater than 1.65 and an optical thickness at a design wavelength that provides a discrete color shift such that the film has a first color at a first angle of incident light or viewing and a second color different from the first color at a second angle of incident light or viewing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of fabricating a color shifting multilayer interference film, comprising the steps of:
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providing a web material with a release layer formed on an upper surface thereof;
forming a first absorber layer on the release layer;
forming a dielectric layer on the first absorber layer;
forming a second absorber layer on the dielectric layer to produce the interference film; and
removing the interference film from the web materials wherein the dielectric layer has an index of refraction of greater than 1.65 and an optical thickness at a design wavelength that provides a discrete color shift such that the film has a first color at a first angle of incident light or viewing and a second color different from the first color at a second angle of incident light or viewing. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification