MULTI-LAYER STRUCTURE FOR PROTECTING IDENTIFICATION DOCUMENTS AND IDENTIFICATION DOCUMENT Russian patent published in 2023 - IPC B42D15/00 B42D25/328 B42D25/324 G09F3/02 

FIELD: identification document protection.

SUBSTANCE: group of inventions relates to a multilayer structure for protecting identification documents and to identification document in form of a passport book containing such a multilayer structure. The multilayer structure includes a removable base film, on one of the sides of which are successively applied: a separating layer, a relief-receiving layer with a diffractive protective element, a demetallized layer of aluminium or copper or nickel with local opaque zones, a reflective layer of zinc sulphide or indium oxide - tin, a printing ink layer and an adhesive layer for fixing the structure on the protected document, while the thickness of the adhesive layer is from 0.2 to 12 microns, the thickness of the relief-receiving layer with a diffractive element is from 0.1 to 10 microns.

EFFECT: inventions improve the reliability of document authenticity identification by increasing the brightness of the imaginary image being restored, as well as increasing the speed of document processing.

7 cl, 4 ex