SHEET WITH OVD IMAGE AND ITS PRODUCTION AS WELL AS MEDIUM USING THE SAME

摘要

PROBLEM TO BE SOLVED: To obtain a sheet with OVD(optical variable device) images which does not allow the easy forgery of respectively varying fluctuating patterns by having a plurality of the OVD images of fixed patterns and the OVD images respectively varying fluctuating patterns disposed adjacently to each of a plurality of the OVD images of the fixed patterns and in correspondence to each thereof. SOLUTION: A plurality of the OVD images 21 of the fixed patterns are formed continuously and the OVD images respectively varying fluctuating patterns are formed adjacently to each of a plurality of the OVD images of the fixed patterns and in correspondence to each thereof. The OVD images 22 of the respectively varying fluctuating patterns are used for management of the OVD 21 of the fixed patterns. Register marks 23 are formed in correspondence to each of a plurality of the OVD images 21 of the fixed patterns. A character ring type embossing device is used when forming the OVD images 22 of the respectively varying fluctuating patterns on a molding sheet. The character rings are heated and the character rings with the OVD are pressed to the molding sheet, by which the relief of the die with the OVD is molded to the molding sheet.