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Device and method for verifying authenticity of banknotes

A technology for banknotes and equipment, which is applied in the field of equipment for checking the authenticity of banknotes, can solve the problems that cannot be fully considered, is time-consuming, and is time-consuming for authenticity checking.

Inactive Publication Date: 2003-03-12
GIESECKE & DEVRIENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this is inconvenient and time-consuming, because, in order to make a reference determination, the actual inspection operation must be interrupted each time in order to enter the corresponding reference papers
Due to this phenomenon, individual reference determinations can only be made at longer intervals, e.g. after a larger number of checked banknotes, since in other words the authenticity check as a whole would be too time-consuming
Time-varying influences, such as those due to ambient light and unlit currents in the individual detectors, cannot be fully accounted for

Method used

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  • Device and method for verifying authenticity of banknotes
  • Device and method for verifying authenticity of banknotes
  • Device and method for verifying authenticity of banknotes

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Embodiment Construction

[0020] figure 1 The schematic structure of an example with two light-emitting diodes 10 and one fluorescence detector 12 is shown. The light emitted by each light-emitting diode 10 has an ultraviolet component and is used to excite fluorescence in the banknote 11 to be inspected. These can be, for example, light-emitting diodes with emission spectra peaked in the ultraviolet spectral region. The emission peak of some typical light-emitting diodes is about 370 nanometers and has a half-value width of about 12 nanometers. In addition, each light-emitting diode may also have an emission peak in the visible spectral region, such as about 430 nanometers, but also emit a sufficiently strong ultraviolet light component. In both cases, especially the latter, it may be necessary to select a specific spectral region from the emission spectrum of the light-emitting diode to excite fluorescence in the banknote to be inspected. This is accomplished by a first filter 15 arranged in front of e...

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Abstract

The invention relates to a device and method for verifying the authenticity of banknotes. The inventive device comprises a light source for emitting light, which is provided for exciting fluorescent light in a banknote to be verified, and comprises a fluorescence detector for detecting the fluorescent light emitted by the banknote to be verified. According to the invention, the light source is a light-emitting diode and the light-emitting diode is designed for emitting light, which contains ultraviolet light at least in one spectral partial range. This enables the device to be provided with a compact design. According to the inventive method, fluorescent light is excited and detected in the banknote to be verified, and the detected fluorescent light is compared with a predefined threshold value. The invention provides that the detected fluorescent light is diminished by the ambient light detected when the light source is switched off. This results in the elimination of measuring inaccuracies while enabling a simple operation.

Description

Technical field [0001] The present invention relates to an apparatus and method for verifying the authenticity of banknotes according to the preambles of claims 1 and 15. Background technique [0002] Counterfeit banknotes are generally printed on ordinary paper containing optical brighteners. On the contrary, the paper of real banknotes generally does not have optical brighteners. The detection of optical brightener on a banknote can therefore be used as a sign of the presence of a counterfeit. Optical brighteners are usually detected by irradiating the banknotes to be inspected with ultraviolet (UV) light. A counterfeit banknote printed on a paper containing a brightener can be recognized because the banknote displays visible fluorescence on the irradiated area. [0003] In the device and method for inspecting the vacuum of banknotes described in the patent US 5640463, the banknotes to be inspected are irradiated with light from a UV light source, and both the UV light reflecte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G07D7/12G07D7/1205G07D7/121
CPCG07D7/122G07D7/121G07D7/1205G01N21/645G01N2201/0624
Inventor 克劳斯·蒂劳夫洛萨·舒特
Owner GIESECKE & DEVRIENT GMBH
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