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Coding system for security documents

A valuable document and coding system technology, applied in the field of coding of objects to be protected, can solve the problems of limited number of geometric structures, limited space of anti-counterfeiting paper, etc.

Active Publication Date: 2006-11-22
GIESECKE & DEVRIENT CURRENCY TECHNOLOGY GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the number of geometries that can be generated from this is limited because of the very limited space available on the security paper

Method used

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  • Coding system for security documents
  • Coding system for security documents

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Experimental program
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Embodiment Construction

[0029] figure 1 An object 10 to be protected is shown, which is provided with a code 11 according to an embodiment of the invention.

[0030] The code 11 comprises two pairs of luminescent substances 12, 13 and 14, 15 associated with each other, which, when excited, emit in the infrared spectral range between 1000 and 1500 nm, in each case in the subrange complement each other, which will be explained in more detail below. The arrangement of the regions 16 with the first pair of luminescent substances 12, 13, the regions 17 with the second pair of luminescent substances 14, 15 and the regions 18 without luminescent substances along a given geometric pattern makes it possible to represent any information by means of a code 11 , such as a product code.

[0031] Luminescent substances 12 and 13 are respectively formed based on neodymium-doped host lattices, and respectively have emission lines in the range of about 1064 nm, such as figure 2shown in the left-hand part of . Ho...

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Abstract

The invention relates to a composition for coding having at least one pair of mutually associated luminescent substances having first and second luminescent substances which emit in a joint emission range located outside the visible spectral range. The emission spectra of the first and second luminescent substances overlap in at least a subrange of the stated emission range such that the emission spectrum of the first luminescent substance is complemented by the emission spectrum of the second luminescent substance.

Description

technical field [0001] The invention relates to a code for an object to be protected. Background technique [0002] In order to provide security paper with an easily machine-readable code, it is proposed in the publication WO 01 / 48311 to provide security paper with at least two types of mottling fibers, which differ in their luminescent properties. In each case, only one of the different speckle fibers is located in a defined uncovered partial area of ​​the security paper, so that the geometry of the partial area and the presence or absence of the speckle fiber can generate a code. However, the number of geometries that can be produced from this is limited because of the very limited space available on the security paper. Contents of the invention [0003] In view of this, the present invention addresses the problem of proposing an encoding whose number of encoding possibilities is increased. [0004] The problem posed can be solved by a coding having the features of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B42D15/00
CPCB42D25/29B42D25/387Y10T428/24802
Inventor 托马斯·吉林沃尔夫冈·劳舍尔
Owner GIESECKE & DEVRIENT CURRENCY TECHNOLOGY GMBH
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