| 摘要 |
PURPOSE:To prevent a forgery and a falsification of an information recording medium by recording a visible image and a non-visible image. CONSTITUTION:A first thermal color developing layer 2 recorded with a visible image, a second thermal color developing layer 3 recorded with an infrared image, a light absorption layer 4 for absorbing an infrared ray of a predetermined wavelength, an adhesive layer 5, a heat insulating layer 7 and a protective sheet 6 are sequentially laminated on a base l. A laser beam is emitted to the layers 2, 3 thereby to record the visible image and the infrared image. The infrared image which cannot be visually recognized by the naked eye is detected by using an infrared filter, thereby verifying truth or falsehood of an information recording medium. |
