Title:
METHOD FOR USING LONG PHOSPHORESCENCE TO PREVENT COUNTERFEITING
Document Type and Number:
WIPO Patent Application WO/2020/237811
Kind Code:
A1
Abstract:
The invention discloses a method for using long phosphorescence to prevent counterfeiting; an ultra-short pulse laser beam having a femtosecond pulse width and an energy density greater than or equal to the long phosphorescence generation threshold of a transparent medium is used to induce the long phosphorescence of any counterfeiting prevention pattern (two-dimensional code, barcode, and the like) inside a transparent material. After the long phosphorescence has subsided, the region having the counterfeiting prevention pattern in the transparent material is invisible to the naked eye under sunlight, and will reproduce the long phosphorescent pattern whenever it is excited by ultraviolet light or white light; the method can be used for counterfeiting prevention.
Inventors:
ZHAO QUANZHONG (CN)
Application Number:
PCT/CN2019/097923
Publication Date:
December 03, 2020
Filing Date:
July 26, 2019
Export Citation:
Assignee:
NANJING TRIZ INSTITUTE OF LASER APPLICATION TECH CO LTD (CN)
International Classes:
G09F3/00; G09F7/00; G09F13/20; G09F19/02; G09F19/06; G09F19/12
Foreign References:
| CN1304841A | 2001-07-25 | |||
| CN201002737Y | 2008-01-09 | |||
| CN107757169A | 2018-03-06 | |||
| CN1293117A | 2001-05-02 | |||
| CN1383998A | 2002-12-11 |
Attorney, Agent or Firm:
NANJING HUIHENG INTELLECTUAL PROPERTY (GENERAL PARTNERSHIP) (CN)
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