Optically variable security device

Details Optically variable security device Optically variable security device

2006-05-30

2006-05-30

Robinson, Mark A. (Department: 2872)

Optical: systems and elements

Holographic system or element

Authentication

Reexamination Certificate

active

07054042

ABSTRACT:
An optically variable security device comprising a thin film reflection filter structure (23) which exhibits a first optically variable effect; and a relief structure (20) on or in the thin film reflection filter structure which exhibits a second optically variable effect.

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