| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an information medium whose verification part for authenticity judgement is comprised of a material hard to obtain, making it very difficult to make a counterfeit, the verification part being made visible by excitation by casting an infrared range light thereon to enable conducting authenticity judgement visually and mechanically. <P>SOLUTION: An information recording part including predetermined information and an up-conversion fluorescent material are included on a substrate, the up-conversion fluorescent material being excited by receiving irradiation with infrared range light, thereby at least a visible verification part is formed thereon. <P>COPYRIGHT: (C)2008,JPO&INPIT |
