| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a security ink by using a security method for making an OVD (optical variable device) as small pieces to make them as a pigment of an ink or a coating, and enabling the writing-in of sufficient information capable of being used for the judgement of truth or false or writing-in a machine readable mark in the small pieces, which could not be possible since their areas are too small. <P>SOLUTION: The security ink containing the pigment is characterized by making a surface relief structure by electronic beam drawing of a pattern by making any of the two interface parts of a first interface part obtained by arranging a plurality of projecting parts or recessed parts by a distance of between their centers as shorter than the shortest wave length of visible light and a second interface part obtained by arranging the plurality of the projecting parts or recessed parts arranged as a shape of non-lattice, by the distance of between their centers as at the shortest wave length of the visible light or longer, as a line-drawn part and a non-line-drawn part respectively and making foil obtained by heat transfer-molding of the surface relief structure, as small pieces to make the pigment. <P>COPYRIGHT: (C)2012,JPO&INPIT |
