SECURITY DOCUMENT CONTAINING TANGIBLE MARK AND TEXTURED ZONE AND METHOD OF ITS MANUFACTURE Russian patent published in 2017 - IPC B42D15/00 

FIELD: physics.

SUBSTANCE: method of manufacturing a security document made in the form of a sheet comprising, at least, one tangible protruding mark on, at least, one of it two sides opposite to each other, allowing the visually impaired people to sense a specific feature of the said document by means of feeling the said mark and to participate in determining its authenticity. Herewith the said mark is, at least, partially surrounded by, at least, one first textured zone, which is a surface that is different to the touch and is extracted from the rest of the said sheet. Herewith its second side also has the second textured zone. Simultaneously, these textured zones are formed. A printing embossed cliche is used, comprising engraved elements configured to form a textured zone on the sheet containing the regions. The first region is formed by a series of adjacent grooves and ribs forming on the other side of the sheet a complementary region provided with ribs and grooves, and the second region is formed by adjacent ribs and grooves forming on the other side of the sheet a complementary region provided with grooves and a rib. These pairs of regions form the said first and the second textured zones. The equation is applied: e+E=F, where e - the depth of the engraved line of the specified cliche; E - the interval between the two lines; F - the frequency of the lineature, at e≥100 microns and F≥500 microns.

EFFECT: document simplifies its authentication.

11 cl, 11 dwg, 2 tbl