To form a falsification prevention means which is impossible to reproduce at the similar cost even when there is an equivalent device or apparatus.
The falsification prevention means advantageously includes gray domain. The visual introduction image of the gray domain can be changed by the conveyance variances at the time of image formation, especially it has bright strip or dark strip along the Y axis direction or has bright or dark pattern along the extension of X axis direction. These are formed in the X axis direction at the location or the positioning of image formation line 2a-2f which is away from the ideal location of 2a'-2f'. The other image contents of the printed articles are alternatively used to form the similar falsification prevention means, however, the gray domain composed of the lines in the direction of high speed scanning very sensitively reacts to the changes of the spaces between the image formation lines, accordingly, it is utilized advantageously to provide the falsification prevention means.
VOSSELER BERND
JP2004508225A | 2004-03-18 | |||
JP2000512231A | 2000-09-19 | |||
JP2005279926A | 2005-10-13 | |||
JPH0259755A | 1990-02-28 | |||
JPH06106368A | 1994-04-19 | |||
JP2002526290A | 2002-08-20 |
Hiroshi Sugimoto
Hiroyasu Ninomiya
Einzel Felix-Reinhard