| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a medium having unique color and color tone which is difficult to be forged or altered and distinguished easily from a forged one by forming a multilayer thin film layer on a basic material and providing a pattern layer between the layers thereof. SOLUTION: The anti-forgery medium 1 comprises a basic material 11, a multilayer thin film layer 12, and a protective layer 14 laminated sequentially and a pattern layer 13 is provided between the layers of multilayer thin film layer 12. From the external view thereof, reflection/transmission characteristics are provided in a specified wavelength region by taking advantage of the optical characteristics of a thin film laminated with the layers of multilayer thin film layer 12 through the basic material 11 or protective layer 14 and the interference of light obtained from the thickness of film. The reflection/transmission characteristics varied depending on the position of observation and color shift effect can be seen. Furthermore, visible information, e.g. a character provided by the pattern layer 13, can be seen therein. This structure provides a medium having unique color and color tone which is difficult to be forged or altered and distinguished easily from a forged one.</p> |
