Security device

Details Security device Security device

2005-06-07

2005-06-07

Boutsikaris, Leonidas (Department: 2872)

Optical: systems and elements

Holographic system or element

Authentication

C359S567000, C283S072000, C283S086000, C430S321000

Reexamination Certificate

active

06903850

ABSTRACT:
A security device has a substrate formed with a surface relief defining an optically variable effect generating structure. At least two different reflection enhancing materials are provided on, or on the same side of, substrate with respect to the surface relief, whereby the optically variable effect can be viewed against a background defined by the reflection enhancing materials.

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