Interference security image structure

Details Interference security image structure Interference security image structure

G - Physics

02

B

G02B 5/28 (2006.01) B42D 15/10 (2006.01) B44F 1/12 (2006.01)

Patent

CA 2543790

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 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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