| 摘要 |
<p>PROBLEM TO BE SOLVED: To impart forgery/counterfeit preventive effects by a copying machine, to securities, etc., by a method wherein at a part where image lines consisting of respective pairs, cross with each other on curved image lines at an area where a latent image is applied, the image lines of both pairs-which are related to the cross, are deleted at the inside between the image lines. SOLUTION: The total of widths of two or more image lines 13 at an area where a latent image is applied, is made equal to the width of one line of an image line 12 at an area where the latent image is not applied. A border line 15 on the image lines between the area where the latent image is not applied and the area where the latent image is applied, crosses with a straight line 11 which comes into contact with a basic curve 8 at an approx. right angle, at a cross point 10 of a contour line 9 of the latent image of the basic curve 8 which constitutes a duplication preventive pattern. On the image lines 13 in the area where the latent image is applied, when a cross point 10' where latent curves 14 of respective pairs of the image lines 13, cross with each other, is located in the internal region between the respective pairs of the image lines 13 which are related to the cross, only for that area, the inside between respective pairs of the image lines 13, is deleted.</p> |
