| 摘要 |
<p>PURPOSE:To obtain a card with a signature forgery prevention function which does not allow signature forgery by providing a photosensitive discoloration layer and a protecting layer inside a signature panel consisting of a transparent layer. CONSTITUTION:A photosensitive discoloration layer 2 and a protecting layer 3 which protects the former are provided inside a transparent signature panel 1. If a panel is exposed to light from above it after signature, an area where a signature is not present on the phtosensitive discoloration layer 2 becomes discolored as a discolored part 5 and an area where the signature is optically projected remains as a non-discolored part 5 without discoloration. Therefore, if a signature forger erases the existing signature on the card and puts a new signature, it is detected at a glance that the forged signature is different from the previous signature remaining on the photosensitive discoloration layer. Thus printing a forged signature can be achieved effectively.</p> |
