Guilloche in diffractive optically variable image devices

Pawel J. Stepien; Remigiusz Gajda; Artur Marszalek

doi:10.1117/12.304690

1 April 1998 Guilloche in diffractive optically variable image devices

Pawel J. Stepien, Remigiusz Gajda, Artur Marszalek

Proceedings Volume 3314, Optical Security and Counterfeit Deterrence Techniques II; (1998) https://doi.org/10.1117/12.304690
Event: Photonics West '98 Electronic Imaging, 1998, San Jose, CA, United States

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 Kinegrams^TM and Kineforms^TM 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.

Citation Download Citation

Pawel J. Stepien, Remigiusz Gajda, and Artur Marszalek "Guilloche in diffractive optically variable image devices", Proc. SPIE 3314, Optical Security and Counterfeit Deterrence Techniques II, (1 April 1998); https://doi.org/10.1117/12.304690

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