Semi-permeable anti-counterfeiting film

Abstract

The semi-transmissive anti-counterfeiting film includes: a substrate, a diffractive optical element layer on the substrate and having a diffractive pattern for forming an image for authenticity determination, and a diffractive optical element layer formed along the outline of the diffractive pattern on the diffractive optical element. The element layer is a light transmittance adjusting film capable of partially reflecting and partially transmitting incident light. Therefore, the semi-permeable anti-counterfeiting film can form diffraction images on both sides of the film by reflecting and transmitting incident light. The semi-permeable anti-counterfeiting film of the present invention can easily present complex images and irregularly present diffraction patterns with random shapes or sizes. Also, images with various colors can be easily represented using light with various wavelengths and phases.

Description

technical field [0001] The invention relates to a semi-permeable anti-counterfeiting film. More specifically, it relates to a semi-permeable anti-counterfeiting film capable of presenting an authenticity-judging image using a authenticity-judging pattern. Background technique [0002] Counterfeiting of valuables such as software, CDs, DVDs, securities, foreign wines, and medicines has become a very big social problem. Most of the items produced by counterfeiting are of low quality, so the corresponding enterprises will suffer heavy losses due to this counterfeiting behavior, such as losing the reputation accumulated through a lot of hard work. In order to solve this counterfeiting problem, many companies are working hard to prevent the distribution of counterfeit products by adopting technologies that are difficult to counterfeit or distinguish genuine products from counterfeit products. [0003] The most typical one that is given to products to prevent counterfeiting is a...

AI Technical Summary

Problems solved by technology

[0008] However, the permeable anti-counterfeiting film has the problem that it is difficult to apply to products of various shapes including three-dimensional objects.

In addition, the transmissive anti-counterfeiting film itself must ensure light transmission as a whole, so there are limitations in the materials constituting the transmissive anti-counterfeiting film.

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