Security device based on customized microprism film

Details Security device based on customized microprism film Security device based on customized microprism film

2011-03-08

2011-03-08

Amari, Alessandro (Department: 2872)

Optical: systems and elements

Holographic system or element

Authentication

C283S085000

Reexamination Certificate

active

07903308

ABSTRACT:
A security device comprises at least two regions, each region comprising a prismatic surface structure defining an array of substantially planar facets. Each region forms a reflector due to total internal reflection when viewed at least one first viewing angle and is transparent when viewed at at least one second viewing angle. The said at least one first viewing angle of one region is different from the at least one first viewing angle of the other region.

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