Security pattern capable of writing variable coding information and preparation method and device thereof

A preparation device for a security pattern capable of writing variable coding information, wherein it comprises:

• a coating-printing mechanism, a substrate conveying mechanism, N groups of point light source arrays, N or N+1 groups of magnetic fields, and an end point curing light source, N=1;
• the N groups of the point light source arrays and the N or N+1 groups of the magnetic fields are arranged at the same side or two opposite sides of the substrate conveying direction;
• the coating-printing device is used for coating and printing a pattern on the surface of a substrate;
• the substrate conveying mechanism is used to convey the substrate coated-printed with the pattern;
• each point light source array is capable of controlling a lighting range and a lighting brightness according to real-time coding information, as to output an optical signal corresponding to the coding information to the pattern coated-printed on the substrate entering an irradiation range of the point light source array, and ink in a corresponding area on the coated-printed pattern is exposed and cured;
• each magnetic field is used to induce the ink in an uncured part of the coating-painted pattern, as to change an angle thereof;
• and
• the end point curing light source is arranged after the N groups of the point light source arrays and N or N+1 groups of the magnetic fields, and is used to cure all of the uncured part of the pattern, as to achieve complete exposure of the pattern.