Title:
偽造防止印刷物
Document Type and Number:
Japanese Patent JP6876221
Kind Code:
B2
Abstract:
To provide a printed matter in which a latent image pattern having continuous gradation appears during copying without being affected by resolution of a copy machine such as a color copy machine.SOLUTION: There is provided a forgery preventive printed matter by forming a printing pattern consisting of a latent image pattern having continuous gradation formed by a first element reproduced by a copy machine, and a background pattern providing camouflage of a latent image pattern formed by having at least a second element at a half tone concentration which is not reproduced by the copy machine, in which it is recognized by view as a constant concentration on the printed matter, but the second element disappears during copying and the latent pattern with the continuous gradation appears.SELECTED DRAWING: Figure 1
Inventors:
Masato Kiuchi
Application Number:
JP2017152988A
Publication Date:
May 26, 2021
Filing Date:
August 08, 2017
Export Citation:
Assignee:
National Printing Bureau
International Classes:
B41M3/14
Domestic Patent References:
| JP2016172340A |
Foreign References:
| US4168088 |