POLYMER MULTILAYER PROTECTIVE ELEMENT WITH OPTICALLY VARIABLE EFFECT Russian patent published in 2012 - IPC B42D15/10 B41M3/14 G07D7/12 

FIELD: printing.

SUBSTANCE: invention relates to counterfeit-proof printing products and is related to polymer multilayer protective element having an optically variable effect. It is designed as a structure in which at least one layer contains micro-raster relief structure, and the second layer comprises a printing raster of micro-images located at the nodes of a printing raster. The spatial period of the printing raster is defined by spatial period of the micro-raster relief structure. Elements of the micro-raster relief structure are made in the form of mirror focusing elements, which are micro-mirrors, embossed micro-knobs on the lacquer layer and phase Fresnel zone plates that bear the reflective or semitransparent reflective thin layer of metal located inside the element in nodes of relief raster. Location and orientation of a raster of mirror focusing elements are chosen so as to conform to the location and orientation of the raster of micro-images formed on the upper surface of the polymer film, so that when looking at the protective element the enlarged floating images of elements of printing raster and enlarged floating images of shadows of elements of printing raster are observed.

EFFECT: invention provides an improvement of protection of valuable documents.

4 cl, 9 dwg, 3 ex