| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent a forgery by holding metal fiber and/or metal thin film in a base material by exhibiting an irregular bent shape change. SOLUTION: When a nip made of a metal roll is treated under a pressurizing condition, an irregular bent shape change is received by an influence of other fiber for constituting a support of containing metal fiber and/or metal thin film. A metal sensor detects different information from the metal fiber and/or metal thin film exhibiting no bent shape change by the irregular bent shape change. When a base material is scanned by the sensor, the sensor obtains an output corresponding to metal distribution in material to be detected. When the output is digitized and stored as intrinsic information of a part to be detected, a signal obtained by using the sensor is compared with the information stored in advance to decide truth or falsehood of material to be collated. Thus, a forgery can not be executed.</p> |
