Method for preparing optical anti-fake element

Abstract

The invention provides a method for preparing an optical anti-fake element, and overcomes the defects in the prior art for preparing the optical anti-fake element, such as big error and low reliability. The method comprises the steps: forming a surface embossment structure layer on the surface of a substrate, wherein the surface embossment structure layer comprises at least two regions, the specific values of the superficial areas and the apparent areas of the surface embossment structure layers in the regions are different mutually; at least forming a plating layer on at least one part of one region of the surface embossment structure layer; forming a buffering layer on all or partial plating layer; and placing the optical anti-fake element with the formed buffering layer in the environment where the optical anti-fake element can react with the buffering layer and the plating layer so that the buffering layer and plating layer are thinned and even disappeared, for reacting, until the needed optical anti-fake element is obtained, wherein the thickness thinning rate of the buffering layer in the unit time is smaller than the thickness thinning rate of the plating layer in the unit time.

Description

technical field [0001] The invention relates to the field of optical anti-counterfeiting, in particular to a method for preparing an optical anti-counterfeiting element. Background technique [0002] In order to prevent counterfeiting by means of scanning and copying, optical anti-counterfeiting technology is widely used in various high-security or high-value-added printed materials such as banknotes, cards and product packaging, and has achieved very good results. [0003] Surface micro- or nano-scale relief structures have been the focus of optical anti-counterfeiting technology development for a long time. When the surface relief structure is used to form an optical anti-counterfeiting element, in order to increase the brightness of the image, a metal reflective layer is usually vapor-deposited on the surface relief. Hollowing out the metal reflection layer to form a pattern on the reflection layer can greatly improve the visual effect and anti-counterfeiting ability of ...

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the defects such as large error, low reliability and poor process controllability in the preparation of optical anti-counterfeiting elements in the prior art, and provides a method for preparing optical anti-counterfeiting elements capable of overcoming these defects

Images