| 摘要 |
<p>PURPOSE: To visualize a latent image even at any copying density level by providing in parallel and/or mixing at least two types of screen patterns having different densities on the image and the background provided at the predetermined area of a base surface, and forming the latent image and the background having the same densities of different numbers of screen lines. CONSTITUTION: A print sheet 1 for preventing copy forgery visualizes a warning character 'copy' on the surface of a copy, and has a stripe screen A formed of a latent image A1 made of 20% of screen density and line pattern of 65 screen lines by magenta print color and/or a background A2 formed of 20% screen density and a halftone pattern of 150 screen lines. The other is a pattern in which a stripe screen B formed of a lamenting B1 made of 12% screen density and line pattern of 65 screen lines and/or a background B2 of halftone pattern of 12% of screen density and 150 screen lines in combination.</p> |
