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8 May 2015 Security hologram foil labels with a design facilitating authenticity testing: effects of mechanical bending of substrates with the glued on holograms
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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.
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Ivo Aubrecht "Security hologram foil labels with a design facilitating authenticity testing: effects of mechanical bending of substrates with the glued on holograms", Proc. SPIE 9508, Holography: Advances and Modern Trends IV, 950806 (8 May 2015); https://doi.org/10.1117/12.2179763
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