| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a card-shaped medium which enables very easy and intelligible checking of authenticity and has a higher effect of prevention of forgery than usual. <P>SOLUTION: The card-shaped medium has a structure wherein block-shaped or layer-shaped fluorescent glass or a member having the powder of the fluorescent glass mixed in is provided on the upper, lower or lateral side of a layer- shaped or small-piece-shaped optical change element. <P>COPYRIGHT: (C)2003,JPO</p> |
