Security element with color change

A security unit and security document technology, which is applied in the inspection of the authenticity of banknotes, the printing of special varieties of printed matter, and the printing process, can solve problems such as inability to verify, and achieve the effect of improving anti-counterfeiting security.

Active Publication Date: 2012-07-04
BUNDESDRUCKEREI GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This cannot be verified in the absence of a radiation source that produces the appropriate stimulus radiation without the aid of

Method used

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  • Security element with color change
  • Security element with color change
  • Security element with color change

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0050] exist figure 1 Two curves are schematically shown in figure 1 , 2, including the same time scale as the abscissa 3. along the upper curve figure 1 The ordinate 4 of plots the intensity 5 of the excitation radiation, which is preferably ultraviolet light and has an excitation wavelength λ 激励 . along the lower curve figure 2The ordinate 6 of draws the observable or observed, with fluorescence wavelength λ 荧光1 The fluorescence intensity of the colorant of the security unit is 7.

[0051] At the start time t that has not yet been stimulated 1 , no fluorescence was observed. with at time t 2 Upon initiation of excitation, observable fluorescence begins to appear. The fluorescence intensity 7 rises almost immediately to its maximum value. Subsequently the fluorescence intensity 7 decreases during the duration of the excitation, and during the first time period ΔT 1 = t 3 -t 2 preferably completely disappears. at time t 4 , although still irradiated with excita...

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PUM

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Abstract

The invention relates to a security element and a color, comprising at least one colorant that emits luminescent radiation when irradiated with electromagnetic excitation radiation, wherein a) the colorant first emits luminescent radiation when irradiated, the intensity of said colorant decreasing or almost vanishing when continuously irradiated with the excitation radiation within a first time interval, and b) the colorant is designed such that the effect described under a) can be observed again after a regeneration time period during which the colorant is not irradiated with the excitation radiation. The invention further relates to value and/or security documents comprising such a security element or such a colorant and to a verification method.

Description

technical field [0001] The present invention relates to inks comprising at least one colorant which emits fluorescent radiation when irradiated with electromagnetic excitation radiation. The invention also relates to security elements and documents of value and / or security documents comprising such inks, as well as methods for their manufacture and authentication. Background technique [0002] Securities and / or security documents are protected against counterfeiting, counterfeiting or falsification. For this purpose, so-called secure cells are used. A security element is a structural unit or component of a security document, which is provided to verify the authenticity of the security document and / or at least to make forgery, falsification and / or counterfeiting difficult or completely prohibited. [0003] Each security element thus has at least one security feature which cannot be produced by means of simple photocopying. Watermarks, holograms, security prints, ie prints ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/56C09K11/62C09K11/88C09K11/89B41M3/14G07D7/12
CPCC09D5/22C09K11/562C09K11/892G07D7/122C09K11/881C09K11/623C09K11/025C09D11/00B42D15/00B42D25/387C09D11/50G07D7/1205
Inventor E・施普林曼
Owner BUNDESDRUCKEREI GMBH
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