ANTICOPYING LAYER TO DOCUMENTS AND METHOD OF ITS PRODUCTION Russian patent published in 1998 - IPC

FIELD: anticopying layer to documents. SUBSTANCE: the layer has at least one sheet of transparent material with at least partly non-transparent areas arranged at intervals; the planes of the areas are located approximately in the same predetermined position relative to the layer surfaces so that approximately in the vertical direction of look on the surface of the sheet or sheets the anticopying layer is mainly non-transparent, and at a definite angle of lock on the surface of the sheet or sheets the anticopying layer becomes mainly transparent; each area consists of the first non-transparent overlaps located on one surface of the sheet or sheets and of the second non-transparent overlaps located at least on one of the other surfaces of the sheet or sheets; the first and second overlaps are arranged mainly horizontally; the width of the overlaps is about 1.75 to 180 um, in particular 8.75 to 90 um, and the width of the intervals between the overlaps is about 1.0 to 82.5 um; the total thickness of the sheet or sheets is 5 to 100 um. The method of production of the anticopying layer to documents is another scope of invention. EFFECT: facilitated procedure of production. 23 cl, 17 dwg, 1 tbl