METHOD OF MARKING ANTI-COUNTERFEIT OBJECT, METHOD OF IDENTIFYING MARKING AND MARKING IDENTIFICATION DEVICE Russian patent published in 2020 - IPC C09K11/08 B42D25/382 B42D25/387 G06K7/10 G06K19/14 

FIELD: physics.

SUBSTANCE: on the information carrier surface there is applied a dispersion containing Stokes and/or anti-Stokes luminophors in an optically transparent binder. Luminophors have virtually identical luminescence spectrum and kinetics of luminescence ignition/attenuation in wavelength range (300–3000) nm and virtually identical excitation spectrum in wavelength range (700–3000) nm, wherein at least one luminophor has the property of optical quenching under the effect of stimulating radiation in wavelength range (300–700) nm. Dispersion can be applied by tampon or polygraphic method. Observation is carried out using a device comprising lens 13, a camera with an IR sensor for fixing the distribution of luminescent particles on the surface of the information carrier in wavelength range (700–3000 nm), source 8 of exciting radiation in spectral range (700–3000) nm, stimulating emission source 15 in wavelength range (300–700) nm, set of light filters 7, 10 and 14, power supply unit 16 and image processing unit 12. First, the device is placed on the data medium by orienting input window 5 accordingly. Unit 12 includes excitation radiation source 8 which passes through filter 7 and enters information carrier. Specified initial distribution of luminescent particles on the surface of the information carrier is recorded in the image processing unit 12. Without excitation radiation, the information carrier is exposed to stimulating radiation, including source 15 and reducing luminescence intensity of only one of the luminophores. This second distribution of luminescent particles is also recorded, and/or the result of comparison is added to the database, and / or the obtained distribution is compared to the distribution stored in the database. If the measured values coincide with the reference data, the result is reflected on display unit 17.

EFFECT: invention can be used for protection of information carriers against forgery and identification of their authenticity.

12 cl, 5 dwg, 3 ex