Laser imaging anti-counterfeiting label and preparation method thereof
An anti-counterfeiting label and laser projection technology, applied in instruments, computing, record carriers used by machines, etc., can solve the problems of reducing the anti-counterfeiting performance of laser holographic anti-counterfeiting marks, difficult to identify genuine marks, and confusing the real ones with fake ones. Large, low-cost effects
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[0031] The invention uses diffractive optical design combined with nano imprinting technology to prepare the anti-counterfeiting label used in the field of anti-counterfeiting, the surface of which is a messy and disordered medium microstructure, which can release anti-counterfeiting information under laser irradiation.
[0032] 1. Optical design of label surface microstructure
[0033] The surface microstructure of the label is calculated by optical design software. That is, the light field distribution of the incident light and the light field distribution of the output plane to be achieved are known, and the parameters of the intermediate optical elements are calculated so that the light field distribution of the incident light after passing through the optical system meets the design requirements. The design software mainly adopts the design method of ray tracing followed by transfer function evaluation. The obtained intermediate optical element is the surface microstruct...
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