Creation of polymer microlens security elements with an optically varying effect
Keywords:
holographic security element, hologram, optical system, microlens, microlens array, stereo effect, parallax, graphic imageAbstract
It is noted that optical security elements based on polymer microoptical systems are a promising platform for creating new visual features that can be used in technologies for protecting securities and documents. The physical principles of stereo and vario image formation using a microlens matrix are presented. It is shown that as a result of the complex interaction between an array of microlenses and an array of microimages, virtual synthesised images are formed, which shift when the viewing angle changes, i. e. floating images. Such images are used as a security feature. With the use of digital hologram recording technology, microimage arrays with high resolution have been obtained, which cannot be achieved using traditional printing techniques. A method has been developed to increase the contrast between areas containing microimages and blank film.
References
- Makhov EM, Potapov AI, Makhov VE. Prikladnaya optika [Applied optics]. Saint Petersburg: North-West State Correspondence Technical University; 2004. 348 p. Russian.
- Gerrard A, Burch JM. Introduction to matrix methods in optics. London: John Wiley & Sons; 1975. XIII, 355 p. Russian edition: Gerrard A, Burch JM. Vvedenie v matrichnuyu optiku. Bozhkov AI, Vlasov DV, translators; Korobkin VV, editor. Moscow: Mir; 1978. 341 p.
- Tanin LV, Moiseenko PV, Manikalo VV, Boboreko AG, Lushchikov MN, Gorcharuk AI, et al., inventors; closed joint stock company «Holography Industry», limited liability company «Light Magic», B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus, Belarusian State University, republican scientific and technical unitary enterprise «Cryptotech» of the Department of State Signs of the Ministry of Finance of the Republic of Belarus, republican unitary enterprise «Minsk Printing Factory» of the Department of State Signs of the Ministry of Finance of the Republic of Belarus, assignee. Identification mark. Belarusian patent BY 5765 U. 2009 December 30. Russian.
- Vasil’ev G. [Raster stereo photography]. Sovetskoe foto. 1970;4:36–37. Russian.
- Fu Y, Ngoi BKA. Investigation of direct milling of micro-optical elements with continuous relief on a substrate by focused ion beam technology. Optical Engineering. 2000;39(11):3008–3013. DOI: 10.1117/1.1312647.
- Steenblik RA, Hurt MJ, Jordan GR, inventors; Visual Physics, LLC, assignee. Micro-optical safety and image display system. Russian Federation patent RU 2602397 C2. 2004 November 22. Russian.
- Balia VK, Denisiuk IYu. Production of three-dimensional optical microstructures with the laser ablation method. Izvestiya vuzov. Priborostroenie. 2012;55(3):51–55. Russian. EDN: OXQAZL.
- Commander LG, Eastell CJ, Isherwood R, Holmes BW, inventors; De La Rue International Limited, assignee. Protective device. Eurasian patent 011968 В1. 2004 April 30. Russian.
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