| 摘要 |
PURPOSE:To prevent forgery of an image which has been formed on the original, and also, fraudulent use of information, and moreover, to execute a copy, as well in accordance with necessity by providing a light source for irradiating ultraviolet rays and a visible light beam and a control circuit for operating selectively one of them. CONSTITUTION:The title copying machine has a light source consisting of an ultraviolet ray lamp 12 and a visible light lamp 11 and provided with the first and the second control parts 301, 302 for operating the lamp 12 first, operating the lamp 11 after an image exposure and executing an exposure at the time of a secret mode. The original which has been prepared by a paint mainly consisting of oxazine does not receive ultraviolet rays, loses a contrast of an image and cannot be copied in case of a regular mode in which an identification number is different, etc. In case of a secret mode in which the identification number is correct, the contrast is generated by ultraviolet rays of the lamp 12, and subsequently, the original is exposed by irradiating it by the lamp 11 and can be copied. The original which has been copied loses the contrast again by an exposure of the lamp 11 and becomes unlegible. |
