THREAD AND PRODUCTION METHOD THEREFOR, FORGERY PREVENTING FORM USING THREAD, AND FORGERY PREVENTING PRINTED MATTER, AND FORGERY JUDGING METHOD USING THEM

摘要

The invention provides a thread and counterfeit preventive paper satisfying the conditions that, when the micro-character of the thread is viewed from one side and opposite side of the paper or printed material, the image of micro-character can be recognized in the same direction from any side, not in opposite direction to each other, and that, when viewed from the opposite side, the image of the corresponding micro-character is not visible. The counterfeit preventive paper 10 and counterfeit preventive printed material have a structure in which a thread 1 having metal deposition layers 3, 4 formed in a pattern of micro-character and colored printed layers 7, 8 formed thereon provided on both sides of a strip-like and light permeable substrate 2 is inserted between paper layers 15a, 15b.