Interference security image structure
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United States of America Patent
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Nov 22, 2011
Grant Date -
Feb 7, 2008
app pub date -
Apr 23, 2007
filing date -
Apr 22, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
An interference filter having a plurality of layers and a spectrum as a function of angle of observation is combined with a metameric element adjacent the interference filter and appearing to have a same color as the interference filter at at least one angle of observation and a contrasting color as said interference filter at least one other angle of observation. A plurality of interference filter layers, including a metallic layer, can be provided on a support structure for the layers. The support structure is then adapted to allow the layers to be seen from a top and a bottom side, with the layers being adapted to have different spectra as a function of angle of observation in reflection and transmission.
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