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Value document having security marking with varying decay time and method for identifying the security marking

A technology of valuable documents, decay time, applied in chemical instruments and methods, processing coins or valuable banknotes, checking the authenticity of banknotes, etc., can solve problems such as low resistance to chemical and physical influences

Active Publication Date: 2019-11-15
GIESECKE & DEVRIENT CURRENCY TECHNOLOGY GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A significant disadvantage of using organic dye molecules is their low resistance to chemical and physical influences

Method used

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  • Value document having security marking with varying decay time and method for identifying the security marking
  • Value document having security marking with varying decay time and method for identifying the security marking
  • Value document having security marking with varying decay time and method for identifying the security marking

Examples

Experimental program
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Effect test

Embodiment Construction

[0090] figure 1 The time curve of the spectral intensity in different detection channels in the case of a combination of luminescent substances with significantly different decay times is shown, which has been explained above.

[0091] figure 2 A schematically shows the emission spectra of two different luminescent materials. These emission spectra are complementary in a sub-range of their (spectral) extended range. The area is shaded.

[0092] figure 2 B shows the overall strength obtained. The main emission range P is the area between the dotted lines. It extends on both sides of the maximum overall strength until the overall strength is lower than 10% of the maximum for the first time (λ 1 Or λ 2 ) At the wavelength.

[0093] figure 2 C schematically shows the effective decay time τ as a function of the wavelength in the main emission range. This example is obtained when the first luminescent material (solid line) has a shorter decay time than the second luminescent material ...

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Abstract

The invention relates to a value document having a security marking in the form of two luminescent substances, the emission spectra of which partially overlap in a primary emission range, wherein theemission spectra have a degree of overlap of less than 80% and more than 5%, wherein the luminescent substances have different individual decay times in the primary emission range, wherein the individual decay times of the luminescent substances differ from one another by more than 50%, relative to the shortest individual decay time.

Description

Technical field [0001] The present invention relates to the technical field of the manufacture and verification of value documents, and relates to a value document with an anti-counterfeiting mark with a continuously changing decay time in the spectrum, and a method for identifying the value document. Background technique [0002] Valuable documents should be understood here as sheet-like objects that represent currency value or authorization and should not be arbitrarily manufactured by unauthorized personnel. Therefore, they are not easy to manufacture (especially to copy), and their existence is a sign of authenticity (that is, manufactured by an authorized institution). Some major examples of such valuable documents are chip cards, coupons, vouchers, checks, etc., especially banknotes. [0003] Valuable documents are usually protected by special markings to prevent undue and possibly illegal copying. It has long been known to equip value documents with luminescent substances ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B42D25/382B42D25/24B42D25/29C09K11/08C09K11/77G07D7/1205
CPCB42D25/29B42D25/382B42D25/24G07D7/1205C09K11/7771C09K11/7774C09K11/7777G07D7/205C09K11/7708C09K11/7709C09K11/7795
Inventor J.凯赫特
Owner GIESECKE & DEVRIENT CURRENCY TECHNOLOGY GMBH
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