US 11,981,157 B2
Optical anti-counterfeiting element and optical anti-counterfeiting product using the same
Kai Sun, Beijing (CN); Baoli Zhang, Beijing (CN); Jun Zhu, Beijing (CN); and Xiaoli Wang, Beijing (CN)
Assigned to ZHONGCHAO SPECIAL SECURITY TECHNOLOGY CO., LTD, Beijing (CN); and CHINA BANKNOTE PRINTING AND MINTING CORP., Beijing (CN)
Filed by ZHONGCHAO SPECIAL SECURITY TECHNOLOGY CO., LTD, Beijing (CN); and CHINA BANKNOTE PRINTING AND MINTING CORP., Beijing (CN)
Filed on Feb. 10, 2021, as Appl. No. 17/172,695.
Application 17/172,695 is a division of application No. 16/483,613, abandoned, previously published as PCT/CN2018/075507, filed on Feb. 7, 2018.
Claims priority of application No. 201710089955.2 (CN), filed on Feb. 20, 2017.
Prior Publication US 2021/0162793 A1, Jun. 3, 2021
Int. Cl. B42D 25/324 (2014.01); B42D 25/373 (2014.01); G02B 3/00 (2006.01); G02B 3/06 (2006.01); G02B 30/27 (2020.01); G06T 3/40 (2006.01); G06T 3/60 (2006.01); B42D 25/29 (2014.01); B42D 25/328 (2014.01)
CPC B42D 25/324 (2014.10) [B42D 25/373 (2014.10); G02B 3/005 (2013.01); G02B 3/06 (2013.01); G02B 30/27 (2020.01); G06T 3/40 (2013.01); G06T 3/60 (2013.01); B42D 25/29 (2014.10); B42D 25/328 (2014.10)] 10 Claims
OG exemplary drawing
 
1. A design method for micro image-text units of an optical anti-counterfeiting element, the method comprising:
determining actual images, wherein each image F(θi, φj) of the actual images having an actual size and corresponding a macroscopic magnified image of the optical anti-counterfeiting element, wherein θ and φ are an inclination angle of the macroscopic magnified image rotating in a y-axis and an inclination angle rotating in an x-axis, respectively, i and j are respective serial numbers of animation frames when the macroscopic magnified image rotates in the y-axis and in the x-axis;
pixelating the each image F(θi, φj) according to the actual size of the each image F(θi, φj) and a size of a micro-sampling tool formed on a first surface of a substrate of the optical anti-counterfeiting element, and each pixel of the each image F(θi, φj) corresponding to one micro-sampling tool, wherein the each image F(θi, φj) is scaled and pixelated into N*N pixels, wherein N=L/p, p is a pitch of the micro-sampling tool, L is a side length of the macroscopic magnified image;
projecting each pixel to a micro image-text unit corresponding to the micro-sampling tool according to the inclination angles θ and φ, such that each micro image-text unit is composed of one pixel from the each image F(θi, φj),
when a second surface of the substrate of the optical anti-counterfeiting element is observed through the micro-sampling tools, a stereoscopic animated anti-counterfeiting feature of the macro magnified image can be seen.