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Proceedings Paper

Security hologram foil labels with a design facilitating authenticity testing: effects of mechanical bending of substrates with the glued on holograms
Author(s): Ivo Aubrecht
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Paper Abstract

Optimal design of security holograms or diffractive optically variable image devices (DOVIDs) that would be complex enough to deter counterfeiters from attempts of mimicking but contains features readily recognizable by laymen has been addressed by many experts. This paper tries to discuss effects of mechanical bending of a flexible substrate to visual appearance of a glued-on foil DOVID. Initially plane, the DOVID is deformed to a convex- or concave-shaped curved surface. Theoretical analyses and experimental results assume the surface to be a cylindrical segment and concern rainbow-type surface-relief holograms that are recorded piecewise in a photoresist material, coated on planar and non-planar substrates.

Paper Details

Date Published: 8 May 2015
PDF: 8 pages
Proc. SPIE 9508, Holography: Advances and Modern Trends IV, 950806 (8 May 2015); doi: 10.1117/12.2179763
Show Author Affiliations
Ivo Aubrecht, Police presidium CR (Czech Republic)

Published in SPIE Proceedings Vol. 9508:
Holography: Advances and Modern Trends IV
Miroslav Hrabovský; John T. Sheridan; Antonio Fimia, Editor(s)

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