| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a copy preventive printed product capable of easily discriminating a copy without influence of an angle for placing in the case of copying. SOLUTION: A gift certificate sheet 100 is formed of a plurality of partitions each made of an area A and an area B. A plurality of line segments radially arranged concentrically with an intersection of diagonal lines of the sheet 100 as a base point are formed on the area A, and a plurality of line segments different (at angle) in a direction at each adjacent area are formed on the area B, and a ground pattern layer 10 uniformly printed is provided on the overall surface of the sheet 100. In the case of copying the sheet 100, since the direction of the line segments formed on the any area corresponds to the angle easily sensed for the scanning direction of the copier, the segments of the corresponding area is discolored to a dark color to be easily visually recognized to be the copy.</p> |
