| 摘要 |
PROBLEM TO BE SOLVED: To prevent falsification or forgery by forming a copy impossible part of a predetermined shape on a developer layer provided on a rear surface of a base sheet by selectively cutting developer by laser emitting, thereby assem bling a void image made of fine pattern in copy information. SOLUTION: A basic constitution of a sheet 1 under pressure sensitive copy comprises a developer layer C on a rear surface of a base sheet F, and a copy impossible part D of a predetermined shape on the layer C by selectively cutting the developer by laser emitting. The part D is formed in a fine pattern such as, for example, a partial enlarged view, microscopic letter, line segment (straight line, wavy line, broken line or dotted line). Since the developer is removed, it does not have copying function. The part D of a predetermined shape may be formed of an entire developer surface or desired part in a spot manner. Further, a developer microcapsule layer may be formed on a backside of the base sheet. |
