MULTILAYER PROTECTIVE ELEMENT WITH ALTERNATE OPTICAL EFFECT AND COUNTERFEIT-PROOF DOCUMENT Russian patent published in 2011 - IPC B32B29/00 G03H1/00 

FIELD: printing industry.

SUBSTANCE: invention relates to counterfeit-proof documents and to a multilayer protective element with an alternate optical effect and a counterfeit-proof document. The multilayer protective element comprises a flexible bearing layer with optically alternating structures, contains two or more groups of repeating images, which move and/or change as the angle of observation varies. Optically alternating structures are formed so that whenever the angle of observation changes, various groups of images move relative to each other. Movement of images referred to various groups takes place in parallel to the plane of the observation angle variation so that images approach or move away in respect of an observer, or movement of images related to various groups takes place perpendicularly to the plane of the observation angle variation so that images move to the right or to the left from the observer. The counterfeit-proof document includes at least one protective element.

EFFECT: invention makes it possible to increase items security by development of a new optical effect that increases recognition of a secured object based on observation of mutual movements of images as the angle of observation changes.

13 cl, 2 dwg, 3 ex