| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an authenticity determination system for easily and surely determine authenticity of a sheet which is easily and inexpensively manufactured and hardly forged. <P>SOLUTION: The authenticity determination system is constituted so as to record, to the sheet 31 for forgery prevention having: sheet information; a predetermined number of first magnetic substance parts a6, a7, b3, b6, c5, c6 formed of a magnetic substance material with first coercive force; a predetermined number of second magnetic substance parts a2, a3, b1, b2, b4, b5, b7, c1, c2, c3, c4, c7 formed of a magnetic substance material with second coercive force smaller than the first coercive force and provided by being planarly mixed with the first magnetic substance parts, a magnetization pattern to the first magnetic substance parts and the second magnetic substance parts with magnetic intensity corresponding to coercive force smaller than the first coercive force and larger than the second coercive force, to read the recorded magnetization pattern, and to determine authenticity based on the read magnetization pattern and the sheet information. <P>COPYRIGHT: (C)2010,JPO&INPIT |
