FIELD: visual identification of unauthorized optical elements in securities. SUBSTANCE: structural device has several embossed diffracting-structure sections of different diffracting effect. Novelty is that in order to submit definite information to user over entire length of desired range of viewing angles at high uniformity and intensity, structure sections of first or at least one additional group is proposed to be made so that identical visual information is ensured from sections of different groups as viewed from different sectors of viewing angle range. In this way any forging of securities such as bank notes, credit cards, etc. by copying, for example, is made impossible or rather difficult. EFFECT: improved design. 5 cl, 5 dwg
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