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Proceedings Paper

Guilloche in diffractive optically variable image devices
Author(s): Pawel J. Stepien; Remigiusz Gajda; Artur Marszalek
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Paper Abstract

In diffractive optically variable image devices (DOVIDs) used as anticounterfeiting elements new features appear, which are directly adapted from traditional security paper techniques such as microprints or guilloche. Usually, they are used in combination with standard optically variable diffractive effects. Modern versatile DOVID printers and microlithographic UV and e-beam techniques allow to obtain a wide range of optically variable effects and hidden features. In this paper, we present various possibilities of employing guilloche in security DOVIDs. The first is an animated guilloche widely used in DOVIDs composed of diffraction gratings such as KinegramsTM and KineformsTM as well as in high resolution dot-matrix elements. The second possibility is the multicolor guilloche, used by means of 2D rainbow holograms. Such an optically variable guilloche is visible in wide range of observation angles, however, it is darker than grating structures. Increased visibility may be achieved using computer generated holograms (CGH) structures what results in widely visible and bright DOVIDs. With CGH structures it is also possible to combine kinematic guilloche with hidden features visible using a special reader and to introduce completely new kinds of effects resulting in a multicolor guilloche with colors changing in cyclic way and others special effects guilloches showing the kinematic effects and/or various color changing effects.

Paper Details

Date Published: 1 April 1998
PDF: 6 pages
Proc. SPIE 3314, Optical Security and Counterfeit Deterrence Techniques II, (1 April 1998); doi: 10.1117/12.304690
Show Author Affiliations
Pawel J. Stepien, Holografia Polska Ltd. (Poland)
Remigiusz Gajda, Holografia Polska Ltd. (Poland)
Artur Marszalek, Holografia Polska Ltd. (Poland)

Published in SPIE Proceedings Vol. 3314:
Optical Security and Counterfeit Deterrence Techniques II
Rudolf L. van Renesse, Editor(s)

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