| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To easily execute an authenticity judgment by latent images without being restricted in an observational direction. <P>SOLUTION: In a sheet base material 2 equipped with a plate part 3, a plurality of recesses 11 depressingly formed from the plate part 3, a plurality of outer peripheral marks 12 provided in the plane part 3 so as to surround every one of a plurality of the recesses 11 and inner marks 13 provided over the whole peripheries of the inside surfaces 11a of every predetermined recesses 11 among a plurality of the recesses 11. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
