US 12,233,658 B2
Multi-plating-layer optical anti-counterfeiting element and manufacturing method thereof
Chunhua Hu, Beijing (CN); Weiwei Zhang, Beijing (CN); Baoli Zhang, Beijing (CN); and Jun Zhu, Beijing (CN)
Assigned to Zhongchao Special Security Technology Co., Ltd., Beijing (CN); and China Banknote Printing and Minting Corp., Beijing (CN)
Appl. No. 17/598,181
Filed by Zhongchao Special Security Technology Co., Ltd., Beijing (CN); and China Banknote Printing and Minting Corp., Beijing (CN)
PCT Filed Mar. 27, 2020, PCT No. PCT/CN2020/081589
§ 371(c)(1), (2) Date Sep. 24, 2021,
PCT Pub. No. WO2020/224352, PCT Pub. Date Nov. 12, 2020.
Claims priority of application No. 201910368308.4 (CN), filed on May 5, 2019.
Prior Publication US 2024/0198712 A1, Jun. 20, 2024
Int. Cl. B42D 25/324 (2014.01); B42D 25/328 (2014.01); B42D 25/373 (2014.01); B42D 25/45 (2014.01); G02B 5/18 (2006.01)
CPC B42D 25/324 (2014.10) [B42D 25/328 (2014.10); B42D 25/373 (2014.10); B42D 25/45 (2014.10); G02B 5/1857 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An optical anti-counterfeiting element, comprising:
an undulating structure layer, wherein the undulating structure layer comprises a first area with a first microstructure, and a second area with a second microstructure; a structural parameter of the second microstructure is greater than a structural parameter of the first microstructure, or a structural secondary parameter of the second microstructure is greater than a structural secondary parameter of the first microstructure;
a first plating layer, wherein the first plating layer is arranged on the first area;
a second plating layer, wherein the second plating layer is arranged on the first area and the second area;
a first protection layer, wherein the first protection layer is located between the first plating wherein the first plating layer and the first microstructure show a combined optical feature in the first area; and the second plating layer and the second microstructure show a combined optical feature in the second area;
the structural parameter is a parameter selected from a depth-to-width ratio and a specific volume; and
the structural secondary parameter is a remaining parameter in the depth-to-width ratio and the specific volume.