FIELD: physics.
SUBSTANCE: optical protective element contains a substrate layer, its surface area located in axes X and Y being furnished with a relief structure for formation of optically recognizable effect, defined by the relief parameters, in particular the relief form, depth, spatial frequency and azimuthal angle. One or more of the relief parameters defining relief structure on the surface site varies subject to the function of parameters variation. The aforesaid surface site is divided into one or more specimen sections and background section. One or more of the relief parameters defining the relief structure, on one or more specimen sections, vary subject to the function of parameters variation shifted in phase relative to the function of background section parameters variation. A verification element is provided for having a verification raster, defined with the help of periodic transmission function the period of which corresponds to that of the parameters variation function.
EFFECT: high degree of protection.
25 cl, 31 dwg
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|
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