Light-emitting medium and method of confirming light-emitting medium
US8523238B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 4, 2011 |
| Grant date | Sep 3, 2013 |
| Priority date | — |
| Expiry date | Aug 4, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D2035/24
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
There is provided a light-emitting medium by which whether a valuable paper or the like is forged or not can be judged easily and promptly. A light-emitting medium constituting a valuable paper includes a light-emitting image. The light-emitting image is composed of a pattern area formed on a substrate by using a first fluorescent ink containing a first fluorescent material, and a background area formed on the substrate by using a second fluorescent ink containing a second fluorescent material. When UV-A is irradiated, the first fluorescent ink and the second fluorescent ink emit light of colors that are viewed as different colors from each other. In addition, when UV-C is irradiated, the first fluorescent ink and the second fluorescent ink 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 UV-A is irradiated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.