Novel secure file

Abstract

The invention discloses a novel secure file, which comprises two layers or three layers of patterns. When the secure file comprises two layers of patterns, the bottom layer is subjected to offset printing, and the surface layer is subjected to letterpress printing; the bottom layer of the secure file gives out monochromatic light with the same color as that of the bottom layer under the excitation of infrared laser, while the surface layer gives out light visible to human eyes under the excitation of the infrared laser. When the secure file comprises three layers of patterns, both the bottom layer and the surface layer are subjected to offset printing, and the middle layer is subjected to letterpress printing; and the bottom layer or the surface layer of the secure file gives out monochromatic light with the same color as that of the bottom layer or the surface layer correspondingly under the excitation of the infrared laser. The novel secure file implements an infrared up-conversion fluorescent material by combining the offset printing and letterpress printing ways with the light-emitting characteristics of infrared up-conversion composite white light, gives out two kinds of different visible lights recognizable by human eyes under the excitation of the infrared light, and is difficult to imitate, strongly elusive and easy to distinguish anti-counterfeiting effects.

Description

technical field [0001] The invention relates to the technical field of anti-counterfeiting, in particular to a novel security document. Background technique [0002] The Chinese patent CN102205761A published in 2011 relates to a security document with optical response characteristics, the security document contains a combination of one or more rare earth compounds anti-counterfeiting materials, the security document can emit infrared light after being excited by ultraviolet light, It also discloses a method for detecting whether the anti-counterfeit feature exists in the file. The invention has the characteristics of strong anti-counterfeiting and concealment, but the anti-counterfeiting feature requires a specific detection instrument for identification. [0003] The Chinese patent CN101678696A, which was applied by German Federal Printing Co., Ltd. in 2008 and published in 2011, relates to a security document and / or a value document with a security element, and the securi...

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The technology is quite expensive to implement

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