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Proceedings Paper

Achromatic features for optically variable devices
Author(s): Andreas Schilling; Rene Staub; Wayne Robert Tompkin
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Paper Abstract

We have studied the use of achromatic features in Optically Variable Devices (OVD) for document security applications. We present various forms of matt structures as we have implemented them in OVD designs. By tailoring the scattering characteristics of the surface relief, we have created OVDs which appear in various intensities of white or gray, and whose brightness can vary as the viewing conditions are changed. Furthermore, we have realized surface reliefs which appear bright and colorless when viewed within a predetermined solid angle and appears dark in all other viewing directions. The gratings appear bright and colorless when viewed from one side of the grating normal; however, when these gratings are rotated by 180 degrees in their plane, the gratings appear dark. We will show gratings of this type, where the surface reliefs have been engineered so that the bright and colorless appearance covers an enlarged solid angle.

Paper Details

Date Published: 19 April 2002
PDF: 9 pages
Proc. SPIE 4677, Optical Security and Counterfeit Deterrence Techniques IV, (19 April 2002); doi: 10.1117/12.462715
Show Author Affiliations
Andreas Schilling, OVD Kinegram Corp. (Switzerland)
Rene Staub, OVD Kinegram Corp. (Switzerland)
Wayne Robert Tompkin, OVD Kinegram Corp. (Switzerland)

Published in SPIE Proceedings Vol. 4677:
Optical Security and Counterfeit Deterrence Techniques IV
Rudolf L. van Renesse, Editor(s)

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