Optical anti-counterfeiting element and anti-counterfeiting product provided with same

Abstract

An optical anti-counterfeiting element comprises a base material, a surface embossment structure layer located on the base material and a coating located on the surface embossment structure layer. The surface embossment structure layer is formed by stacking a plurality of units. Each unit comprises a flat area and an embossment structure area formed by a plurality of optical grating units. Any optical grating units of any two units are not collocated. The parameters of the optical grating units of any two units are different. The flat areas of any two units are not completely overlapped.

Description

technical field [0001] The invention relates to an optical anti-counterfeit element and an anti-counterfeit product with the optical anti-counterfeit element. Background technique [0002] In order to prevent counterfeiting by means of scanning and copying, holographic anti-counterfeiting technology is widely used as a solution for optical anti-counterfeiting technology in various high-security or high-value-added printed materials such as banknotes, cards and product packaging, and has achieved very good results. Effect. [0003] At the end of the last century, with the development of computer science and image processing technology, holographic anti-counterfeiting technology has entered the era of digital development. One of the most important achievements is the successful application of digital technology to the production of synthetic holograms. The comprehensive utilization of various technologies and equipment such as holographic photography technology, computer cont...

AI Technical Summary

Problems solved by technology

The synthesis process usually involves overlapping multiple images or dividing them in the form of lattice grids and interspersing them in the same area. In the process of synthesis, it is inevitable that each image must be "segmented" to be "interspersed" in the same area, so there is a loss of image information, which affects the final composite large field of view and full parallax "dot matrix" hologram The sharpness and contrast of the image will affect the anti-counterfeiting ability of the product

[0005] If the subject pattern in the existing synthetic hologram is analyzed separately from its background, then the existing synthetic hologram often adopts the method of giving the theme picture and the background the same brightness and adopting different colors, or giving the pattern a certain brightness and leaving the background blank. However, no matter which of the above two processing methods is adopted, the theme pattern cannot avoid the loss of clarity and contrast to a certain extent in the process of "segmentation" and "interspersed" synthesis of multiple images containing the theme pattern

The impact of this defect will become more serious as the number of images to be synthesized increases

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