3 June 2004 Diffractive second-line security features for optically variable devices
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Abstract
Optical effects in Optically Variable Devices (OVDs) are generally grouped in three different categories depending on how the effects can be verified: First-line features, second-line features, and third-line features. In this paper, we present novel examples for different classes of second-line security features designed for use in OVDs. The first class consists of features based on polarization effects. The second class consists of features which are based on special forms of very small text or images, that are invisible to the naked eye. The third class encompasses moire features that are based on engineered diffractive microstructures. These second-line security features can be checked by using simple verification devices like a polarizer, a magnifier glass, or a binary amplitude screen.
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Andreas Schilling, Wayne Robert Tompkin, Rene Staub, "Diffractive second-line security features for optically variable devices", Proc. SPIE 5310, Optical Security and Counterfeit Deterrence Techniques V, (3 June 2004); doi: 10.1117/12.527686; https://doi.org/10.1117/12.527686
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