Holographic anti-counterfeiting method for coin with surface micro-relief structure and its pressing mold

Abstract

The invention discloses a holographic anti-counterfeiting method for a coin with a micro relief profile on the surface and a pressing die thereof. The method comprises steps: 1, an optical hologram of the coil surface is recorded; 2, the optical hologram of the coil surface is reproduced; 2, the numeric value of a computed hologram of the coil surface is computed; 4, a binary optical hologram of the micro relief on the coil surface is designed, and the computed hologram is converted into a binary optical surface micro relief profile; 5, according to the binary optical hologram of the micro relief on the coil surface, a micro relief profile on the steel surface of the die is determined; and 6, a binary optical processing method is adopted to process the micro relief profile on the steel surface of the die. The method can enhance the anti-counterfeiting level of the coin and the processing seal thereof, and a novel, simple and quick first-line anti-counterfeiting technology is provided for the public.

Description

technical field [0001] The invention belongs to the technical fields of optical holography, computational holography and binary optics, and relates to a holographic anti-counterfeiting method for a coin with a surface micro-relief structure and a pressing mold thereof. Background technique [0002] At present, there are two types of currency and commemorative coins commonly used in countries around the world: banknotes and coins. Compared with banknotes, counterfeiting of coins is more difficult to identify, and it is difficult to distinguish the authenticity from the fake. Most of the counterfeit coins that have been discovered so far are the fourth set of RMB 1 yuan coins. Due to the low cost of imitation coins, such counterfeit coins have poor molding technology, fuzzy patterns, thin coatings, and are easy to rust and corrode. It is still difficult to distinguish its authenticity in time. [0003] In addition, counterfeit banknotes are more difficult to circulate than co...

AI Technical Summary

Problems solved by technology

[0002] At present, there are two types of currency and commemorative coins commonly used in countries around the world: banknotes and coins. Compared with banknotes, the forgery of coins is more difficult to identify, and it is difficult to distinguish the authenticity from the fake.

Most of the counterfeit coins that have been discovered so far are the fourth set of RMB 1 yuan coins. Due to the low cost of imitation coins, such counterfeit coins have poor molding technology, fuzzy patterns, thin coatings, and are easy to rust and corrode. It is still difficult to distinguish its authenticity in time

[0003] In addition, counterfeit banknotes are more difficult to circulate than coins

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