| 摘要 |
PROBLEM TO BE SOLVED: To provide a method, which can judge a sheet on a spot without requiring complicated judging apparatus or the like at the inspection of a fake and the descrimination of kind of bill such as a blind bill or the like. SOLUTION: This sheet produces sound by horizontally rubbing an upper side sheet and a lower side sheet each other, which are pilingly formed by doubling the paper itself of various kinds of security papers equipped with antifalsification marks or blind marks. Unevennesses are arranged in set arrangement on the surfaces of the upper side sheet and of the lower side sheet in some portion of the sheet, the unevenness is made of a pair of a convexity and a concavity under the state that the distance of one pitch comprising a pair of the convexity and the concavity is divided in the distance of the upper bottom part of the convexity and the distance of the lower bottom part of the concavity under the condition that the length of the lower bottom part is formed longer than the length of the upper bottom part. In this sheet, unique sound is produced by changing the convexity or its shape, its direction and the three dimensions of the convexity. COPYRIGHT: (C)2008,JPO&INPIT |
