| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide three or more kinds of information parts respectively having three or more kinds of infrared absorbing inks each showing high light absorbency in the predetermined wavelength portion of infrared wavelength region under the condition that portions showing high light absorbency do not overlap with one another on an infrared reflecting base material. <P>SOLUTION: In this provided mechanically readable information printed material, concealment is performed so as not to be visually allowed to decide the presence of a plurality of information parts provided on the base material and their information contents and, in addition, the confirmation of true information concealed in a plurality of information is made difficult and further only make-believe concealed information is made to be recognized. <P>COPYRIGHT: (C)2008,JPO&INPIT |
