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Proceedings Paper

High-security transparent overlays: a new method for selective demetallization of fully registered embossed holograms
Author(s): Wilfried Schipper
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Paper Abstract

Optically variable devices (OVDs) are relatively new security features which are currently finding widespread application on a variety of security documents as a means of protection against counterfeiting. The OVD is in general a complex optical recording and the commonest form seen today is based on the presence of optically diffracting features, which are manufactured using embossing technology. This presentation deals with one particular type of security product -- a transparent or semi-transparent document overlay which may include an OVD combined both with UV-fluorescent or other special links, and may also include individualized information applied by laser-engraving technology. The main applications lie in the field of paper-based security documents such as passports, visas, driver's licenses and ID- cards.

Paper Details

Date Published: 15 March 1996
PDF: 3 pages
Proc. SPIE 2659, Optical Security and Counterfeit Deterrence Techniques, (15 March 1996); doi: 10.1117/12.235465
Show Author Affiliations
Wilfried Schipper, Hologram Co. RAKO GmbH (Germany)

Published in SPIE Proceedings Vol. 2659:
Optical Security and Counterfeit Deterrence Techniques
Rudolf L. van Renesse, Editor(s)

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