| 摘要 |
<P>PROBLEM TO BE SOLVED: To realize a medium which enables reading of three kinds of information on the basis of the information obtained from a first area containing substances that emit light in at least two different wavelength bands on the occasion when invisible information is irradiated by infrared light, and on the basis of the interception of one emission of light by a second area containing a substance that absorbs one of the above emission wavelengths. <P>SOLUTION: A light-emitting image part which is formed of the first area containing the substances that emit the light of the wavelength bands of visible light and infrared light by irradiation with the infrared light is laid on a base, and a hidden image part which is hidden by the second area containing the substance that transmits the irradiation light and the wavelength band of the infrared light of the above emission wavelength bands and absorbs the wavelength band of the visible light in the emission wavelength bands is laid on a part on the light-emitting image part. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
