SECURITY DEVICE COMPRISING A PRINTED METAL LAYER IN FORM OF A PATTERN AND METHODS FOR ITS MANUFACTURE
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United States of America Patent
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Issued Date -
Oct 6, 2011
app pub date -
Oct 26, 2009
filing date -
Oct 27, 2008
priority date (Note) -
Abandoned
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Abstract
A security device including a transparent base layer having a surface provided with an optically variable relief microstructure; a transparent high refractive index layer on the surface of the base layer, the high refractive index layer conforming to the surface relief microstructure; and a reflective metal layer printed on the transparent high refractive index layer. The metal layer is printed in the form of a pattern. The thickness of the transparent high refractive index layer is selected so as to achieve constructive interference of light with a wavelength λ in the range 450-650 nm reflected at each surface of the high refractive index layer.
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