Patent ID: 8523238
Filing Date: 2013-09-03
Classification: B42D,G07D

Abstract:
1. A light-emitting medium including a light-emitting image on a substrate, wherein: the light-emitting image includes a first area containing a first fluorescent material and a second area containing a second fluorescent material; when invisible light within a first wavelength range is irradiated, the first fluorescent material and the second fluorescent material emit light of colors that are viewed as different colors from each other; when invisible light within a second wavelength range is irradiated, the first fluorescent material and the second fluorescent material emit light of colors that are viewed as different colors from each other, the colors being different from the colors that are viewed when the invisible light within the first wavelength range is irradiated; and when the invisible light within the first wavelength range and the invisible light within the second wavelength range are simultaneously irradiated, the first fluorescent material and the second fluorescent material emit light of colors that are viewed as the same color with each other.