Alignable diffractive pigment flakes and method and apparatus for alignment and images formed therefrom
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United States of America Patent
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Dec 1, 2009
Grant Date -
Nov 23, 2006
app pub date -
Aug 2, 2006
filing date -
Jul 15, 2002
priority date (Note) -
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Abstract
Diffractive pigment flakes are selectively aligned to form an image. In one embodiment, flakes having a magnetic layer are shaped to facilitate alignment in a magnetic field. In another embodiment, the flakes include a magnetically discontinuous layer. In a particular embodiment, deposition of nickel on a diffraction grating pattern produces magnetic needles along the grating pattern that allow magnetic alignment of the resulting diffractive pigment flakes. Color scans of test samples of magnetically aligned flakes show high differentiation between illumination parallel and perpendicular to the direction of alignment of the magnetic diffractive pigment flakes. In another embodiment diffractive pigment flakes are selectively aligned by electrical fields. In other embodiments, special diffractive optical variable images are described and the method to produce them.
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