False proof structure for driving license and its identifying method
A driver's license and microstructure technology, which can be used in information-carrying cards, patterns featuring light projection effects, decorative arts, etc., can solve the problems of high anti-counterfeiting cost, long detection time, etc. The effect of high craftsmanship
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[0037] Embodiment 1: An anti-counterfeit structure for a driver's license. On the plastic film of the card body, a sub-wavelength structured grating microstructure constitutes a logo pattern, and the logo pattern includes at least three graphic areas. In the first graphic area Contains two kinds of graphics complementary, and the orientations of the microstructure structures are arranged orthogonally to each other, forming a double color-changing visual channel, and the areas of the two graphics do not overlap each other. See the square 22 and other parts 21 in the rhombus pattern of accompanying drawing 1, FIG. 2 is a schematic diagram of orientation in another orthogonal direction; the period of the microstructure is 300-450 nanometers, the depth of the groove is 80-150 nanometers, and the microstructure is filled with a transparent high-refractive index medium layer. The refractive index of the medium is greater than 1.8. The first graphic area is composed of a rhombus and ...
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