Method for authenticating document of value

Abstract

The invention relates to the anti-fake technical field of default free securities such as paper currencies, certificates, magnetic cards and the like, and discloses a method for identifying the truth and false of a valuable security. The method comprises the following steps: an AC electric field or electron source the energy and frequency of which are higher than a threshold value is used for irradiating a mark zone of a valuable security; emission of narrowband-like laser of at least a wavelength is detected from the valuable security along with response of the AC electric field or the electron source to the irradiation to prove that the valuable security is true. The invention simultaneously discloses a valuable security which comprises a carrier which forms a plane substrate and at least a security structure which is printed or embedded in the surface of the carrier; the security structure at least comprises a resonant cavity which is composed of an electroluminescent pigment and afeedback element; the resonant cavity can respond to the irradiation of the AC electric field or the electron source the energy and the frequency of which are higher than the threshold value to produce the emission of the narrowband-like laser of the at least one wavelength. By the method, the true and false identification of the valuable security is achieved by the electroluminescent pigment.

Description

technical field [0001] The invention relates to the technical field of anti-counterfeiting security securities such as banknotes, certificates, and magnetic cards, and in particular to a method for identifying the authenticity of valuable securities and a valuable securities with anti-counterfeiting features. Background technique [0002] In the electroluminescence laser introduced in the patent US4081763, its feedback mechanism is to use a Fabry-Perot resonant cavity. When the active layer is ZnS:Mn, the device can be stimulated to emit when the audio voltage is higher than 60V. . However, the application of this method in banknotes, securities, and paper is limited. Because of its excellent preparation performance and stability, a dielectric reflective film suitable for circulation requires a vacuum chamber, which is relatively expensive and relatively troublesome to manufacture. [0003] In patent CN1163848 an optical based method and device for document authentication ...

AI Technical Summary

Problems solved by technology

A problem arises in the traditional use of electroluminescence, that is, the saturation behavior of the light output, which affects the signal-to-noise ratio of the detection signal, making it easy to cause misjudgment when applying this method to achieve encoding

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