| 摘要 |
PROBLEM TO BE SOLVED: To easily form a pattern for forgery prevention.SOLUTION: An ink jet printer includes a plurality of heads. By one head, a first image layer 81 of a first color is formed in a predetermined target region 8 on a base material 9, and by applying ink onto the first image layer 81 by other one head, a second image layer 82 of a second color different from the first color is formed in the target region 8. By further applying ink onto the second image layer 82 by other one head, a third image layer 83 of a third color different from the second color is formed in the target region 8. A transmission pattern region which is an assembly of a plurality of minute regions is set within the target region 8, and the first to third image layers 81-83 are formed in a region in the target region 8 excluding the transmission pattern region. |
