7 April 2000 Combined optical/digital security devices
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Abstract
Modern holographic security devices used as emblems against counterfeiting are being more difficult as they should oppress criminal world. 2D, 3D, 3D rainbow holograms or simple diffraction structures protecting documents can not be acceptable against illegal copying of important documents, banknotes or valuable products. Recent developments in technology of Optical variable devices permit world leaders to create more advanced security elements: Kinegrams, Exelgrams, Pixelgrams, Kineforms. These products are used for protecting the most confidential documents and banknotes, but now even their security level can not be enough and besides their automatic identification is vulnerable to factors of instability. We elaborate new visual security devices based on the usage of expensive and advanced technology of combined optical/digital security devices. The technology unites digital and analogue methods of synthesis and recording of visual security devices. The analogue methods include techniques of optical holography - different combinations of 2D/3D, 3D, 2D/3D + 3D structures. Basing on them the design with elements of 3D graphics including security elements and hidden machine- readable images are implemented. The digital methods provide synthesis of optical variable devices including special security elements, computer generated holograms and Kineforms. Using them we create determined and quasi-random machine-readable images. Recordings are carried out using the combined optical and electronic submicrometer technology elaborated by Optronics, Ltd. The results obtained show effectiveness of the combined technology permitting to increase the security level essentially that should increase tamper and counterfeit resistance during many years.
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Vladimir I. Girnyk, Vladimir I. Girnyk, Igor V. Tverdokhleb, Igor V. Tverdokhleb, Andrey A. Ivanovsky, Andrey A. Ivanovsky, } "Combined optical/digital security devices", Proc. SPIE 3973, Optical Security and Counterfeit Deterrence Techniques III, (7 April 2000); doi: 10.1117/12.382203; https://doi.org/10.1117/12.382203
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