11 May 2011 Optoelectronic system "HOLOINID" for automatic individualization and identification of security holograms
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Abstract
Necessity of devices and systems for identity verification and individualization of security holograms (SH) is growing together with the growth of SH production. The hidden coded micro image as a set of points (bits) was chosen as a new security element. This image is separately added into hologram by laser perforation on the final stage of SH production after replication. Such element is different for different SH, that allows not only controlling identity of SH, but also distinguishing one hologram from another. Designed optoelectronic system HOLOINID consists of two blocks: laser microperforator for SH individualization and optoelectronic device for micro-images readout and SH identification. Specialized software allow control the laser microperforator, process micro-images received by reading optoelectronic device using certain algorithm, and make a decision about SH identity. The block of laser microperforator for SH individualization works due to the high power density of the laser radiation in a focused spot forming at the SH metalized thermolacquered layer. Hidden coded image represents a set of optical bits (which form information field) and check objects for image capturing and processing. Optical point (bit) size is usually 30..50 μm while period between points is 70 μm. Advantage of laser miroperforator for SH individualization is ability to get hidden coded images in holograms without SH surface layer damage. It is possible to get by using high-aperture short-focus optical system. Know-how of the technology is an ability to use laser microperforation as in thermolacquered layer (which is lied between lavsan layers and metalized layer) and in metalized layer (for SH on hot stamping foil).
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Dmitry Sergeevich Lushnikov, Sergey Borisovich Odinokov, Alexander Yurievich Pavlov, "Optoelectronic system "HOLOINID" for automatic individualization and identification of security holograms", Proc. SPIE 8074, Holography: Advances and Modern Trends II, 807410 (11 May 2011); doi: 10.1117/12.886604; https://doi.org/10.1117/12.886604
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