| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide copy preventive printed matter at a low cost against forgery made by copying the printed matter which frequently occurs due to a remarkable advancement of color copying machines. <P>SOLUTION: The printed matter suitable for preventing copying has two regions different in the number of screen lines on a part or the whole part of the base material surface so that the regions are adjacent to each other. The two regions different in the number of screen lines consist of the first region 3 having dots of 175 lines in the number of screen lines and the second region 2 having dots of 80 lines in the number of screen lines, the screen density in the first region 3 and the second region 2 is same between 18 to 20%, making the first region 3 and the second region 2 of the printed matter mutually undistinguishable under visible light to prevent the first region 3 from being copied with a copying machine, allowing copying of the second region only. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
