Optical anti-fake element and product using same

Abstract

The invention provides an optical anti-fake element and a product using the optical anti-fake element aiming at the defects that when an existing optical anti-fake element is adopted for achieving a color optical variability characteristic, the color optical variability characteristic is single, and the anti-fake effect is not good. The optical anti-fake element comprises a substrate, micro relief structures, a color functional layer and a reflection layer. The substrate is provided with a first surface and a second surface which are mutually opposite. The micro relief structures partially cover the first surface of the substrate, the color functional layer is distributed in gaps among the micro relief structures, and the reflection layer is located on the second surface of the substrate and partially covers the second surface of the substrate. The micro relief structures are composed of transparent or semitransparent imaging elements with a focusing function, and imaging can be performed on the color functional layer through the reflection layer.

Description

technical field [0001] The invention relates to the field of optical anti-counterfeiting, in particular to an optical anti-counterfeiting element and products using the optical anti-counterfeiting element. Background technique [0002] Due to the unique visual effect and easy identification of color light-changing optical anti-counterfeiting components, they are widely used in high-security products such as banknotes, credit cards, passports and securities, as well as other high-value-added products. The current optical color change anti-counterfeiting technologies mainly include optical variable coating technology, liquid crystal optical change technology, zero-order optical change and co-extruded film. [0003] Optically variable coating technology is widely used in the public anti-counterfeiting of banknotes and other highly anti-counterfeiting securities. By using optically variable coating technology, it can present different colors at different viewing angles, and it i...

AI Technical Summary

Problems solved by technology

When the anti-counterfeiting element of this structure is used to realize the feature of color light change, it is necessary to set the arrangement of the micro-graphic array as a strip grid interspersed with different colors. The disadvantages are: (1) This structure requires a micro-lens array, The text arrays are arranged periodically, and the periodic error is at the sub-micron level when making the original plate, so the production is difficult; (2) In the production process, the two surfaces of the substrate need to be processed sequentially, so the process flow Complex; (3) In the production process, it is necessary to solve the alignment problem of the microlens array and the micrographic array, so the process controllability is low; (4) The thickness of the entire anti-counterfeiting element is at least the focal length of the microlens array used , making it more difficult to apply this component to high-security anti-counterfeiting products, especially window security threads, and the applicability is correspondingly reduced

Therefore, when adopting the optical anti-counterfeiting element of this structure to realize the color-light variable feature, the first three defects in the above-mentioned four-point defects still exist when making the optical anti-counterfeiting element, and, because the micro-graphic array and micro The lens arrays overlap and interfere with each other, thereby affecting the quality of the sampled color light-changing features, further reducing the anti-counterfeiting effect and practical value of the optical anti-counterfeiting element

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