| 摘要 |
PURPOSE:To print invisible data while holding a white substrate natural from the aspect of a design, to print variable data inherent as invisible data and to mechanically confirming printed and recorded data to markedly enhance the security against forgery and alteration. CONSTITUTION:A data recording medium is constituted by laminating an infrared absorbing layer for reading data, a thermal recording layer 3 changed in the transmissivity of an infrared region by temp. and constituting a recording image by the difference of infrared transmissivity, a photothermal conversion layer 5 for writing data showing selective absorbancy at a specific wavelength within an infrared region and showing permeability within other infrared region and a heat-resistant protective layer 7 pervious to infrared rays on a substrate 1. |
