| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that a designedness is deteriorated, although determination of authenticity by a machine is possible, when printing is made with infrared absorptive ink, since the ink itself is dark. SOLUTION: First printing is made on a printing surface of a base 1 by using the infrared absorptive ink which contains an infrared absorptive pigment showing an L value of 50 or more as brightness. After a first infrared absorptive printed area 2 is formed by the first printing, second printing is made over the first infrared absorptive printed area 2 by using infrared absorptive ink showing likewise the L value of 50 or more as brightness. The substrate of the base 1 is not hidden and transmittance becomes excellent since the brightness of the infrared absorptive ink used in every printing is high. Besides, a second infrared absorptive printed area 4 printed in superposition is visually recognizable in itself as a pattern and thus the design property is enhanced. COPYRIGHT: (C)2009,JPO&INPIT |
