ANTI-COUNTERFEITING PATTERN HAVING OPTICALLY VARIABLE STRUCTURE

摘要

An anti-counterfeiting pattern having an optically variable structure, comprising lithographic lines (1) and gravure blind embossed relief lines (2) printed on a carrier. The lithographic lines (1) are a set of lithographic curve lines having a curvature, the widths of the lithographic curve lines changing from thick to thin, or thin to thick. The gravure blind embossed relief lines (2) are a set of curve lines corresponding to the lithographic lines, and having the same curvature. The relief lines (2) are overprinted on the lithographic lines (1) with a width variation identical to that of said lithographic lines (1). Accurate overprinting of the two printing types forms a curved relief structure wherein the width of the lines changes continuously. When a printed product is rotated and observed, a continuously variable optical effect is seen.