| 摘要 |
PROBLEM TO BE SOLVED: To increase security of a hologram and prevent copying by irradiating a layer, other than a hologram recording layer with laser light, to physically or chemically modify the layer and record individual information, such as characters, numbers, figures and biometrics information. SOLUTION: A laser marking hologram is produced by selectively irradiating a layer 3, other than a hologram recording layer 1 in a hologram having a layered structure with laser light 17, so as to modify the irradiated portion and recorded with characters, numbers, figures, biometrics information or the like showing contrast in the irradiated portion and in a non-irradiated portion. COPYRIGHT: (C)2008,JPO&INPIT |
