Patent ID: 9028929
Filing Date: 2015-05-12
Classification: B41M,B42D,B44F,C09D,G07D,Y10S,Y10T

Abstract:
1. A light-emitting medium including a light-emitting image on a substrate, wherein: the light-emitting image includes a plurality of first pattern elements containing a first fluorescent material and a plurality of second pattern elements containing a second fluorescent material; the plurality of first pattern elements and the plurality of second pattern elements form a plurality of micro-characters; there is no portion where the first pattern element and the second pattern element are in contact with each other; the plurality of micro-characters are arranged adjacently both horizontally and vertically to form a plurality of micro-character rows, with each of the first pattern elements configured to form a micro-character portion of a latent image buried in the plurality of micro-character rows; 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 the same color with each other; when invisible light within a second wavelength range is irradiated, the first pattern elements and the second pattern elements are viewed as pattern elements of colors different from each other, whereby the latent image in the plurality of micro-character rows is caused to appear; and a size of one micro-character in the plurality of micro-character rows is not more than 300 μm square.