Printing an authentication pattern with multi-deflection continuous inkjet printer

摘要

A method for printing an authentication pattern wherein, using a multi-deflection continuous inkjet printer, the pattern is printed on a substrate and only contains a small number of black pixels per raster. The resolution in the travel direction X of the substrate and in direction Y of the rasters is thereby largely improved compared with printing in dot-matrix mode, which makes reproduction of the pattern difficult for an infringer not having means to determine the electric charge to be applied to each of the droplets of a train of droplets needed to print each raster of the pattern.

主权项

1. A marking printed on a printing substrate, said printing substrate being the surface of an object or of a packaging of said object, said marking including a group of white and black pixels, and a succession of rasters spaced apart in a direction X as per a raster pitch, each said raster having a direction substantially parallel to a direction Y substantially perpendicular to direction X, said marking comprising:
a first zone comprising an identification marking of said object, said identification marking being in dot-matrix mode; and a second zone associated with said identification marking and comprising an authentication pattern representing at least one line of line-drawing type, wherein all said black pixels of a raster of said authentication pattern are disposed at a distance from an axis of the direction X that is continuous between a minimum distance and a maximum distance, and wherein each said raster comprises no more than three black pixels.