| 摘要 |
PURPOSE:To avoid the formation of a duplicated material by a black-white duplicator by using a system in which energy to be received by the sensitizer of a duplicator is almost equalized at a picturing section and a non-picturing section for a picture former for secret documents. CONSTITUTION:A picture section 3 recorded by an ink, etc., and a non-picture section 4 are formed on the base sheet 2 of a piclture former 1. Spectroscopic reflectivity in the sections 3 and 4 is equally set in the region with a sensitizer having a high sensitivity, but that of the region away from the region of high sensitivity is set to be higher than the region of high sensitivity. Energy to be received by the sensitizer of a duplicator is equally set for both the sections 3 and 4. Even if a duplicate is intended to obtain on such a picture former 1 as a manuscript by using a black-white duplicator, the sections 3 and 4 of the picture former 1 can not be discriminated by the sensitizer of the duplicator and aimed duplicate can not be obtained. |
