| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a copy prevention medium which has copy prevention and copy restraint effect in a copier and can inexpensively be mass-produced. <P>SOLUTION: In the copy prevention medium 10, a metal layer 15 is disposed on at least one side surface of a base 11 and, on the surface of the metal layer 15, a printed layer 18 as a gradation pattern, a latent image layer 19 having a latent image formed by a difference of light reflectance and information 17 are disposed, wherein a copy body obtained by copying the copy prevention medium 10 is wholly darkened, a gradation pattern part of the printed layer is camouflaged in accordance with the gradation pattern in the information 17 and is hardly deciphered, and a latent image part formed by a difference of light reflectance of the latent image layer is activated and becomes visible to discriminate that the copying is performed, and the gradation pattern is composed of an optional combination of halftone blocks. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
