Optical anti-counterfeiting element and anti-counterfeiting product

Abstract

The embodiment of the invention provides an optical anti-counterfeiting element and an anti-counterfeiting product, and belongs to the field of optical anti-counterfeiting. The optical anti-counterfeiting element comprises a base material, a first micro-relief structure and a second micro-relief structure, wherein the base material comprises a first surface and a second surface opposite to each other; the first surface is at least partially covered with the first micro-relief structure, the first micro-relief structure comprises a first micro lens array and a first micro-image-text array; thesecond surface is at least partially covered with the second micro-relief structure, the second micro-relief structure comprises a second micro-lens array and a second micro-image-text array, the first micro-lens array can perform sampling synthesis on the second micro-image-text array so as to form a first reproduction image, the second micro lens array can perform sampling synthesis on the firstmicro-image-text array so as to form a second reproduction image. The reappeared images after sampling magnification can be observed from both sides of the base material respectively.

Description

technical field [0001] The invention relates to the field of optical anti-counterfeiting, in particular to an optical anti-counterfeiting element and an anti-counterfeiting product. Background technique [0002] Due to its unique visual effect and easy identification, optical anti-counterfeiting components are widely used in high-security products such as banknotes, credit cards, passports and securities, as well as other high-value-added products. [0003] Micro-lens array anti-counterfeiting technology uses micro-lens as a micro-sampling tool to sample corresponding micro-images and texts. By designing sampling points under different viewing angles, it presents dynamic enlarged images with animation effects and visible to human eyes. Patent documents such as CN101563640A, CN101120139A, US5712731A, and CN102958705A disclose the same type of anti-counterfeiting elements with microlens arrays and micro-text arrays on the two surfaces of the substrate respectively. Observatio...

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Problems solved by technology

Patent documents such as CN101563640A, CN101120139A, US5712731A, and CN102958705A disclose the same type of anti-counterfeiting elements with microlens arrays and micro-text arrays on the two surfaces of the substrate respectively. Observation, the Moiré magnification of the micro-text array by the micro-lens array reproduces a pattern with a certain depth of field or a dynamic effect, and the features cannot be observed from the other side (micro-text array side)

The defects of the anti-counterfeiting element of this structure are: (1) the plate-making process is complicated, and it is necessary to make the original plates of microlens arrays and micro-text arrays on different surfaces; The problem of alignment with the micro-graphic array, the process is more complicated, and the controllability is poor; (3) The thickness of the anti-counterfeiting element is greatly increased, which is not conducive to the design and application of some high-security products

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