| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light-emitting medium which can easily and quickly discriminate whether or not securities etc. have been counterfeited. <P>SOLUTION: The light-emitting medium 10 constituting securities includes a light-emitting image 12. The light-emitting image 12 comprises: a pattern region 20 formed on a substrate 11 using a first fluorescent ink 13 that includes a first phosphor; and a background region 25 formed on the substrate 11 so as to be adjacent to the pattern region 20 using a second fluorescent ink 14 that includes a second phosphor. When irradiated with UV-A, the first fluorescent ink 13 emits a first color light, and the second fluorescent ink 14 emits first color light or color light that is visible as the light of the same color as the first color. When irradiated with UV-C, the first fluorescent ink 13 emits second color light, and the second fluorescent ink 14 emits the second color light or color light that is visible as the light of the same color as the second color. When irradiated with UV-A and UV-C at the same time, the first fluorescent ink 13 emits third color light, and the second fluorescent ink 14 emits fourth color light. <P>COPYRIGHT: (C)2012,JPO&INPIT |
