| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To obtain a forgery preventive sheet having a watermark formed in a part applied with a material suitable for machine reading, and to provide a manufacturing method thereof, an authenticity determination method thereof, and an authenticity determination device thereof. <P>SOLUTION: When a spray liquid containing the material suitable for machine reading is sprayed toward a surface of a wet paper on a paper machine by using a spray device installed on the paper machine, a spray liquid pressure and a distance between the surface of the wet paper and a spray nozzle are controlled. A position applied with the material suitable for machine reading and a position of a watermark is collated with each other to determined whether they aligned with each other or not, and read data of at least one of a reflected light state and a light emission state of the paper and read data of a transmitted light state of the paper are collated with respective corresponding read data obtained by an authentic forgery preventive sheet. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
