Interference security image structure

Details Interference security image structure Interference security image structure

2007-04-23

2011-11-22

Repko, Jason M (Department: 2624)

Image analysis

Applications

C359S359000, C359S585000, C359S589000

Reexamination Certificate

active

08064632

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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