FLUORESCENT ANTI-COUNTERFEIT FIBER OF WHICH OPTICAL COLOR IS VARIABLE WITH IRRADIATION ANGLE OF EXCITING LIGHT AND ANTI-COUNTERFEIT MATERIAL

摘要

A fluorescent fiber and an anti-counterfeiting material have an optical color that varies with irradiation angles of exciting light. The anti-counterfeiting fiber includes at least two components of materials that extend parallel along the longitudinal direction without twisting. At least one component contains photoluminescence material. The distribution of the components makes the anti-counterfeit fiber form a shielding structure for exciting light, and has an orientation structure. The exciting light shielding structure and orientation structure enable, when the anti-counterfeit fiber falls freely into a plane paralleled to the horizontal plane, the existence of at least two irradiation angles of exciting light above the plane paralleled to the horizontal plane, from which exciting light irradiates on the anti-counterfeit fiber respectively. The anti-counterfeit fiber thereby displays obvious visual difference between two different luminescent colors. In this manner, the visual characteristic of fluorescent anti-counterfeit fiber cannot be imitated by the printing filament.