Optical anti-counterfeit element, product using the optical anti-counterfeit element and preparation method thereof

Abstract

The invention relates to the field of optical anti-counterfeiting, and discloses an optical anti-counterfeiting element, a product using the optical anti-counterfeiting element and a manufacturing method of the optical anti-counterfeiting element. The optical anti-counterfeiting element comprises a base material, reflective elements, a sub-wavelength structure and coatings, wherein the reflectiveelements are formed on at least one surface of the base material, the sub-wavelength structure at least partially covers the reflection elements, and the coatings are deposited on the sub-wavelength structure and the reflection elements which are not covered with the sub-wavelength structure. The optical anti-counterfeiting element is provided with the reflection elements, the sub-wavelength structure covered on the reflection elements and the coatings which cooperate with one another so as to form reflection observation and transmission observation which are two different but related colorfuldynamic effects.

Description

Technical field [0001] The invention relates to the field of optical anti-counterfeiting, in particular to an optical anti-counterfeiting element, a product using the optical anti-counterfeiting element and a preparation method thereof. Background technique [0002] Optical variable coating technology is widely used in public anti-counterfeiting of high anti-counterfeiting securities such as banknotes. It can present different colors under different viewing angles, which is easy to describe and easy to recognize by the public. It cannot use cameras, scanners, printers, etc. Electronic equipment is imitated or copied, so it has a high anti-counterfeiting ability. [0003] However, because optical variable products have been used for decades, the pure optical variable coating technology can no longer meet the needs of the anti-counterfeiting field. The characteristic of light change is that the color of the anti-counterfeiting product changes with the angle of observation. The huma...

AI Technical Summary

Problems solved by technology

However, since the directional arrangement of optically variable magnetic particles depends on the magnetic field, it is restricted by the shape of the magnetic field, and the shape cannot be designed arbitrarily, and specific directional equipment and processes are required.

At the same time, due to the above-mentioned dynamic light-changing design based on magnetic light-changing colors, the optical anti-counterfeiting products formed have the same color under the two conditions of reflection observation and transmission observation, so that the optical change can be observed from the reflection observation conditions and transmission observation conditions. The effect is not obvious

Moreover, since the generation principle of the above-mentioned colors is based on the principle of interference, the reflected light has no polarization characteristics, and it is impossible to realize its own effective expert anti-counterfeiting

If you need to add expert anti-counterfeiting elements, you must add corresponding design elements, which will inevitably destroy the original structure of optical anti-counterfeiting products

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