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Title:
METHOD FOR FORMING FALSIFICATION PREVENTION MEANS ON PRINTING PLATE
Document Type and Number:
Japanese Patent JP2008023997
Kind Code:
A
Abstract:

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.


Inventors:
MARTIN SCHMITT-LEWEN
VOSSELER BERND
Application Number:
JP2007189679A
Publication Date:
February 07, 2008
Filing Date:
July 20, 2007
Export Citation:
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Assignee:
HEIDELBERGER DRUCKMASCH AG
International Classes:
B41C1/00; B41F7/02; B41M3/14; G03F7/20
Domestic Patent References:
JP2004508225A2004-03-18
JP2000512231A2000-09-19
JP2005279926A2005-10-13
JPH0259755A1990-02-28
JPH06106368A1994-04-19
JP2002526290A2002-08-20
Attorney, Agent or Firm:
Toshio Yano
Hiroshi Sugimoto
Hiroyasu Ninomiya
Einzel Felix-Reinhard