An optical anti-counterfeiting element and its manufacturing method

Abstract

The invention discloses an optical anti-counterfeiting element and a manufacturing method thereof. The manufacturing method includes that forming an undulant structure layer on a support layer, wherein the undulant structure layer comprises a first region and a second region not adjacent to each other, a third region surrounding the first region and adjacent to the first region, and a fourth region surrounding the second region and adjacent to the second region; plating metal reflecting layers on the undulant structure layer in a uniform surface density; printing positive-working photoresist and negative-working photoresist corresponding to the first region and second region on the metal reflecting layers, wherein the boundary of the positive-working photoresist is located in the third region and surrounds the first region, and the boundary of the negative-working photoresist is located in the fourth region and surrounds the second region; exposing from the fronts or backs of the positive-working photoresist and negative-working photoresist; developing; removing the metal reflecting layers not protected by the positive-working photoresist and negative-working photoresist. The optical anti-counterfeiting element and the manufacturing method thereof are capable of keeping the metal reflecting layers corresponding to the first region and second region and enable the anti-counterfeiting ability of the anti-counterfeiting element to be effectively improved.

Description

technical field [0001] The invention relates to the field of optical anti-counterfeiting, in particular to an optical anti-counterfeiting element and a manufacturing method thereof. Background technique [0002] In order to prevent banknotes, credit cards, passports, securities and product packaging from being copied, optical anti-counterfeiting technology is usually used to implant optical anti-counterfeiting elements in these printed materials, so as to achieve the purpose of anti-counterfeiting. [0003] In order to increase the brightness of anti-counterfeiting images, optical anti-counterfeiting originals generally use metal reflective layers. In order to increase the anti-counterfeiting effect, the metal reflective layer needs to be hollowed out to form a specific pattern. In the prior art, there are generally two methods for hollowing out the metal reflective layer, one is the water washing method to remove the metal, and the other is the alkali washing method to rem...

AI Technical Summary

Problems solved by technology

This technical solution can retain the metal reflective layer corresponding to the first region or the second region, and achieve the effect of accurately positioning the metal-removing hollowing out, but it cannot retain the metal reflective layer corresponding to the first region and the second region at the same time

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