Laser imaging anti-counterfeit label and preparation method thereof

Abstract

The invention discloses a laser projection type anti-counterfeit label and a preparation method thereof, and belongs to the fields of optical anti-counterfeiting and micro-nano processing. The surface of the label is provided with a single layer or multiple layers of disordered nano-scale embossment structures, and an anti-counterfeiting image can be presented after laser irradiation. The surface structure of the label is obtained by means of computer aided optical design, and by means of diffraction optics and Fourier optics, the anti-counterfeiting image is converted into a phase modulation structure on the surface of the label. Under the same incident light condition, different anti-counterfeiting images are corresponding to different label surfaces. The preparation method of the label comprises the steps of preparing a mother template by mean of optical etching, prepaing a nickel template by means of electroplating, and preparing the label by means of nano-impression. The laser projection type anti-counterfeit label has the advantages that a common laser pen is used as an identification tool, the projected anti-counterfeit image is high in brightness and strong in visual impart force, and different from the characteristics of a common laser holographic label that an optical variable image is low in contrast and difficult to discriminate, the laser projection type anti-counterfeit label can effectively improve the anti-counterfeit performance.

Description

technical field [0001] The invention belongs to the field of optical anti-counterfeiting and micro-nano processing, and specifically relates to the preparation of anti-counterfeiting labels with laser projection micro-nano structures by diffraction optical design and micro-nano processing methods such as photolithography, reactive ion etching, and nano-imprinting. Background technique [0002] Anti-counterfeiting technology refers to the measures taken to prevent counterfeiting, which can accurately identify the authenticity within a certain range, and is not easy to be imitated and copied. The losses caused by counterfeit and shoddy products in our country amount to hundreds of billions of RMB every year. It is urgent to crack down on counterfeit and shoddy products and improve anti-counterfeiting technology. With the emergence of digital scanning equipment and color printers, the threshold for traditional anti-counterfeiting technology to be copied and cracked is getting ...

AI Technical Summary

Problems solved by technology

At present, there are hundreds of manufacturers that can produce laser holographic anti-counterfeiting labels. The diffusion of technology and production management problems make some real

Images