All-dielectric optically variable pigments
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United States of America Patent
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Jul 3, 2007
Grant Date -
Jun 23, 2005
app pub date -
Dec 19, 2003
filing date -
May 31, 2002
priority date (Note) -
In Force
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Abstract
The light transmitted and reflected by all-dielectric optically variable pigments varies according to viewing angle. The color travel of an all-dielectric optically variable pigment depends on amplitude changes and wavelength shifts in reflectance peaks of the pigment. The width and center wavelength of reflectance peaks can be controlled by selecting the ratio of thicknesses between high-index and low-index layers in a thin film stack. Reflectance peaks can regenerate or become suppressed and shift with tilt angle, thus providing a wide variety of color trajectories.
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