| 摘要 |
<P>PROBLEM TO BE SOLVED: To form identification information in an area which can not visually be recognized from the outside and to conduct a nondestructive management by using the identification information in an information recording medium comprising the lamination of a plurality of layers. <P>SOLUTION: The information recording medium comprises an inlet 110 which is sandwiched between intermediate layers 120a and 120b and surface sheets 130a and 130b. In this case, the inlet 110 is provided with an identification information area 113, on the surface of which an Ag layer 116 comprising materials detectable by X-rays is formed, and the Ag layer 116 is processed by a laser to form a shape indicating prescribed information. <P>COPYRIGHT: (C)2004,JPO |
