| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a novel hologram sheet that reproduces a hologram in a different wavelength from illumination light, unlike a hologram that reproduces a hologram reproduction image in a same wavelength with illumination light so as to improve authenticity thereof, in a hologram sheet using a hologram. <P>SOLUTION: In a hologram sheet, a photochromic thin film layer is formed on a hologram formation layer. Photochromic molecules are illuminated by excitation light to enable determination of a hologram reproduction image by visual inspection according to a hue of a coloring in a visible light region, and a forgery prevention property is enhanced. <P>COPYRIGHT: (C)2013,JPO&INPIT |
