| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a printed matter provided with the copy preventing function and the forgery preventing function, make it hard to manufacture another printed matter the same as the original printed matter, also make it easy to judge whether the printed matter is genuine or not, and also judge whether a copy or a duplicate formed by scanning by a scanner is genuine or not. SOLUTION: The printed matter A is provided with latent image patterns 3a, for example, of characters of T, P and O, on which two to several kinds of ground tint patterns 8 whereon ground tints of the same ground tint pitch of the ground tint ratio 1:1 between linear sections and non-linear sections are disposed by the different ground tint angles on a sheet 1 and also the ground tint phases shifted by the half-pitch to the above ground tint patterns are formed within one to several kinds of ground tint pattern areas, and when latent image ground tint sheets B are so overlapped one another as to align the ground tint angles of the sheets, the latent image ground tint patterns formed on the ground tint pattern areas corresponding to respective ground tint angles are developed in the form of characters of T, P and O.</p> |
