Title:
OPTICAL ANTI-COUNTERFEITING ELEMENT AND OPTICAL ANTI-COUNTERFEITING PRODUCT
Document Type and Number:
WIPO Patent Application WO/2021/027708
Kind Code:
A1
Abstract:
An optical anti-counterfeiting element (1) and an optical anti-counterfeiting product (0), relating to the optical anti-counterfeiting field. The optical anti-counterfeiting element comprises: a substrate (2), wherein the substrate has a first surface (21) and a second surface (22) that are opposite to each other, and at least a part of the region of the substrate is transparent; and a first semi-reflective and semi-transmissive coating (31), a medium layer (32), and a second semi-reflective and semi-transmissive coating (33) that are sequentially deposited on the first surface, wherein a ratio of the refractive index to the extinction coefficient of the first semi-reflective and semi-transmissive coating is different from that of the refractive index to the extinction coefficient of the second semi-reflective and semi-transmissive coating. When viewed from the first surface, the optical anti-counterfeiting element displays a bright first color; when viewed from the second surface, the optical anti-counterfeiting element displays a bright second color; when looked through, the optical anti-counterfeiting element displays a third color; when the optical anti-counterfeiting element is separately viewed from the first surface and the second surface and is tilted, a color change effect is displayed.
Inventors:
ZHANG WEIWEI (CN)
SUN KAI (CN)
HU CHUNHUA (CN)
SUN KAI (CN)
HU CHUNHUA (CN)
Application Number:
PCT/CN2020/107721
Publication Date:
February 18, 2021
Filing Date:
August 07, 2020
Export Citation:
Assignee:
ZHONGCHAO SPECIAL SECURITY TECHNOLOGY CO LTD (CN)
CHINA BANKNOTE PRINTING & MINTING CORP (CN)
CHINA BANKNOTE PRINTING & MINTING CORP (CN)
International Classes:
B42D25/324; B42D25/20; B42D25/351; B42D25/36
Foreign References:
| CN102514443A | 2012-06-27 | |||
| CN102514443A | 2012-06-27 | |||
| CN106891637A | 2017-06-27 | |||
| CN103050055A | 2013-04-17 | |||
| CN102501500A | 2012-06-20 | |||
| CN1546602A | 2004-11-17 | |||
| US20050104364A1 | 2005-05-19 |
Attorney, Agent or Firm:
RUNPING & PARTNERS (CN)
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