FIELD: process engineering.
SUBSTANCE: this invention relates to protective element intended for protective element designed to protect bond papers and comprising first and second authentification attributes. First authentification attribute comprises first system consisting of multiple focusing elements that make first screen and second system comprising microscopic structures that make second screen. First and second systems are arranged so that spatial frequencies of two aforesaid screens slightly differ. Note here that microscopic structures of second system, when observed through focusing elements of the first system, are seen magnified due to moire effect. Second authentification attribute can be controlled with the help of hardware and/or visually and it is not susceptible to influence of the first system of the first authentification attribute.
EFFECT: protective element features high degree of protection against forgery.
43 cl, 28 dwg
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