WO2004111952A1 - Controle de la conductivite electrique et/ou de proprietes magnetiques d'elements de securite dans des documents de securite - Google Patents

Controle de la conductivite electrique et/ou de proprietes magnetiques d'elements de securite dans des documents de securite Download PDF

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Publication number
WO2004111952A1
WO2004111952A1 PCT/EP2004/006067 EP2004006067W WO2004111952A1 WO 2004111952 A1 WO2004111952 A1 WO 2004111952A1 EP 2004006067 W EP2004006067 W EP 2004006067W WO 2004111952 A1 WO2004111952 A1 WO 2004111952A1
Authority
WO
WIPO (PCT)
Prior art keywords
substrate
sensor
measurement
arrangement according
security element
Prior art date
Application number
PCT/EP2004/006067
Other languages
German (de)
English (en)
Inventor
Manfred Heim
Original Assignee
Giesecke & Devrient Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Giesecke & Devrient Gmbh filed Critical Giesecke & Devrient Gmbh
Publication of WO2004111952A1 publication Critical patent/WO2004111952A1/fr

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Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/04—Testing magnetic properties of the materials thereof, e.g. by detection of magnetic imprint
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/02—Testing electrical properties of the materials thereof
    • G07D7/026—Testing electrical properties of the materials thereof using capacitive sensors

Definitions

  • the invention relates to a method and an arrangement for checking the electrical conductivity and / or the magnetic properties of a security element connected to a substrate of a security document by means of at least one conductivity and / or magnetic sensor.
  • Security documents in the sense of the invention are in particular banknotes, checks, shares, passports, identity cards, identity cards, check cards,
  • Security documents typically consist of paper and / or plastic.
  • Security elements with electrically conductive and / or magnetic security features by means of which the authenticity of the security documents equipped with them can be checked, can be connected to the substrate of the security document in a variety of ways, for example in the form of security threads integrated into the substrate, security strips applied to the substrate or as a full-surface or structured print, the printing ink used having the desired electrically conductive and / or magnetic properties.
  • the object of the present invention is therefore to propose a test method and a test arrangement with which the test can be carried out quickly in order to record the complete production quantity as far as possible.
  • the in-line test enables a much higher test density to be achieved.
  • quality defects can be reacted to very quickly, so that the substrate in question is removed or rejected can be declared to preclude unnecessary further processing of the substrate from the outset.
  • test method and the test arrangement are particularly suitable for use in a printing device.
  • magnetic materials are also vapor-deposited on security foils to secure valuables. According to the invention, these can also be checked during manufacture. Likewise, the electrical conductivity resulting from the vapor-deposited metal can also be checked there if necessary.
  • the substrate is usually guided over deflection rollers.
  • the security elements are checked directly on such a deflection roller, since the position of the substrate is particularly stabilized by the deflection roller. This offers the advantage that the distance between the sensor and the substrate can easily be kept constant. A constant distance or at least knowledge of the distance between the sensor and the substrate at the time of the measurement can be essential, since the distance has a considerable influence on the measurement signal strength of most conventional sensors.
  • the deflection roller should consist of a non-magnetizable material or at least of a material with the lowest possible magnetizability when security elements with magnetic properties are tested, and should consist of an electrically non-conductive material if security elements are on them electrical conductivity can be checked. In the latter case, it may be sufficient to equip the deflecting roller with an electrically non-conductive cover material, which is preferably several millimeters thick, in order to exclude or at least largely suppress the influence of a metallic core underneath.
  • the security elements are checked between two deflection rollers. Any influences by the deflecting rollers on the measurement of the electrical conductivity and / or magnetic properties of the security element to be tested can thereby be considerably reduced.
  • the substrate can be guided between the deflecting rollers in a guide device in order to ensure a constant distance from the sensors, but again it must be ensured that the guide device itself must not have a negative influence on the measurement.
  • the measurement is therefore preferably carried out at a point at which the substrate is freely guided between two deflection rollers.
  • the sensors are advantageously spaced apart from one another transversely to the transport direction of the substrate on a stable spanning the substrate Trusses arranged.
  • the individual sensors are each fixed in one place and representatively measure a trace of the substrate being transported past for magnetic and / or electrically conductive properties.
  • the substrate is thus tested along its entire length along one or more tracks.
  • the test density can be increased further by increasing the number of sensors.
  • an individual magnetic sensor and / or an individual conductivity sensor is moved back and forth along the traverses across the entire width of the substrate.
  • the security elements applied over the entire substrate width can be recorded at certain time intervals with reduced technical complexity.
  • the greatest test density is obtained by combining the aforementioned first and second variants by moving several sensors back and forth along the cross members.
  • this multiple benefit has recurring security elements at regular intervals, such as, for example, B. a security thread and possibly yet another security strip, a security print or other security elements with magnetic properties and / or electrical conductivity.
  • the measured values measured by the sensors are therefore preferably compared in terms of their distance and their height with predetermined reference values, the height of the respective reference values being able to be different for the individual security elements to be tested.
  • FIG. 1 shows a printing device with a printing unit and a test arrangement according to the invention
  • Figure 2 shows the process of magnetizing magnetic areas
  • Figure 3 shows the time course of measurement signals generated by magnetic areas.
  • FIG. 1 shows a printing device in which a substrate 1 is guided through a printing unit 4 and printed with a structured security printing 12 in the form of spaced-apart strips that run transversely to the substrate transport direction and have magnetic and / or electrically conductive properties.
  • a structured security printing 12 in the form of spaced-apart strips that run transversely to the substrate transport direction and have magnetic and / or electrically conductive properties.
  • the substrate 1 is further guided over deflection rollers 5 and 7, the magnetic properties and / or electrical conductivity being checked directly on one or both deflection rollers 5, 7 or in a freely guided area between the deflection rollers 5, 7.
  • both variants are realized in that the electrical conductivity by means of several conductivity sensors 2 between the two deflecting rollers 5, 7 and the magnetic properties are carried out directly on the second deflecting roller 5 in the transport direction by means of a plurality of magnetic sensors 3.
  • the sensors 2 and 3 are each mounted on a crossbar 9 and can be displaced transversely to the transport direction (double arrow).
  • the conductivity sensors 2 and magnetic sensors 3 can alternatively also be provided on a common crossbar 9. However, it is important that, for example, the magnetization in the course of the transport is carried out with the associated magnetic sensor before the test.
  • the deflecting roller 5 consists of a non-magnetizable material and carries a cover material 6 which is several millimeters thick and which reduces the influence of the roller on the measuring system. Such a cover material 6 is particularly useful if the electrical conductivity is measured directly on the roller. It should therefore be electrically insulating.
  • the distance measuring system 8 can be an optical system, for example, in that the distance between the substrate 1 and the distance measuring system 8 is determined in a conventional manner by interference measurement using a laser beam directed onto the substrate 1 and reflected by the substrate 1.
  • Capacitive sensors or eddy current sensors are particularly suitable as conductivity sensors 2, which are only indicated schematically in FIG. 1.
  • Capacitive sensors comprise two or more electrode surfaces, which are usually on the same side of the measured material to be tested, ie here the substrate 1 are attached.
  • An alternating voltage between, for example, 10 kHz and 1 GHz is applied to at least one electrode.
  • the AC voltage then couples in a contactless manner, namely capacitively, to the conductive area of the security element and further from the security element to the other receiving electrode.
  • the disturbance of the alternating field caused by the introduction of the security element into the alternating electrical field is detected and serves as a measure of the electrical conductivity of the security element.
  • the electrode surfaces are arranged opposite one another on both sides of the substrate 1.
  • an alternating voltage can be applied between the two electrodes opposite the substrate 1.
  • the dielectric constant between the electrode surfaces changes with the electrical conductivity of the foils / paper web, which are transported past between the electrodes.
  • the electrical conductivity is then assessed by analyzing current and voltage or phase shifts between current and voltage.
  • capacitive sensors it is possible to detect individual cracks in the conductive film / paper web.
  • inductive magnetic sensors or magneto-resistive sensors in particular giant magnetic resistant sensors (GMR sensors) are used.
  • the sensors are combined with a permanent magnet or an electromagnet 11 with which the security elements are magnetized in order to be able to reliably detect them.
  • the permanent or electromagnet 11 can be integrated in the magnetic sensor, but in the exemplary embodiment shown it is arranged in front of the magnetic sensors 3 in the transport direction of the substrate 1. Magnetization is explained below with reference to FIG. 2. In the case shown in FIG. 2, the magnetization takes place by means of two permanent magnets, in that the substrate 1 is passed between two identical magnetic poles. This produces a field strength H directed in the transport direction of the substrate 1, which should preferably be ten times as large as the coercive field strength Hc of the magnetic security features to be detected.
  • the permanent magnets 11 preferably extend over the entire transport width of the substrate 1.
  • Magnetic sensors Most of the usual magnetic sensors only deliver a measurement signal at the beginning and at the end of a magnetic area that passes them.
  • the signal level depends not only on the sensor but also on the transport speed of the substrate, on the remanent magnetization of the magnetic area to be measured and under certain circumstances on the width of the magnetic area.
  • magnetic sensor signals are thus generated, which are compared in terms of their time interval and in their height in an evaluation device 10 with predetermined reference values.
  • the signal generation is illustrated in FIG. 3.
  • the substrate 1 with printed magnetic security elements 12 is transported past a magnetic sensor 3 at the speed v.
  • the magnetic areas 12 are spaced differently from one another, extend over a different length in the transport direction and are magnetized to different extents, which is shown in FIG. 3 by the different height of the security elements 12.
  • the measurement signals plotted on the time axis t deliver positive and negative measurement values when the security elements 12 enter or exit from the measuring range of the magnetic sensor 3, as well as differently strong measuring signals depending on their magnetization strength.
  • the distance between negative and positive measured values can be used to determine the extent of the magnetic security elements in the direction of transport, the distance between positive and negative measured values, the distance between adjacent magnetic security elements and the height of the measured values to determine the magnetization strength and with the reference values in the Compare evaluation device 10.
  • the transport speed v must be taken into account, as well as the width of the magnetic area to be measured.
  • the measurement procedure described in relation to FIG. 3 is problematic if the magnetic security element extends over the entire transport length of the substrate, for example if it is applied to the entire surface of the substrate or is present as a magnetic strip running in the transport direction. Because with such an arrangement there is neither a beginning nor an end of the magnetic areas, so that the magnetic sensors do not deliver a signal.
  • the magnetic sensors 3 are preceded by a magnetic write head, which magnetizes the magnetic area in sections in one direction and the other by generating an H field in different directions.
  • a horseshoe magnet designed as an electromagnet can serve as a magnetic write head serve, to which opposite voltages are applied depending on the writing direction.
  • 1 and 2 can also be designed as electromagnets, the polarization of which is reversed depending on the writing direction.
  • the permanent magnets can be rotated in the opposite direction at a predetermined frequency, so that the south poles and the north poles are opposite one another
  • test according to the invention can also be carried out in other production phases during the production of the security element or the security document.
  • a test can also be carried out in a metallization system in which magnetic materials are vapor-deposited onto the security paper in order to produce the security element.
  • the electrical conductivity which results from the vapor-deposited metal can also be checked, if necessary.
  • a measurement in a device for producing the security element 12 is also conceivable.
  • security threads as security elements 12, foils printed with electrically conductive or magnetic or luminescent substances, metallized and then laminated or laminated on a second foil.
  • the film laminate is then cut into individual threads, which are rolled up and then applied to the security paper.
  • the test can e.g. take place in the associated laminating, slitting and / or thread cutting machine.
  • a test is carried out in a separate and external test device that does not carry out a manufacturing process.
  • the security thread cut into webs is rolled up or unrolled in an external test device between two rollers and the rolled or rolled security thread 12 by means of the sensor according to the invention, which is attached to one or both rollers or lying between the rollers, on electrical or magnetic conductivity are checked.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Abstract

L'invention concerne un procédé et un dispositif de contrôle de la conductivité électrique et/ou des propriétés magnétiques d'un élément de sécurité connecté à un substrat d'un document de sécurité. Selon l'invention, le contrôle est effectué lors du processus de fabrication de l'élément de sécurité ou du document de sécurité. Le contrôle peut notamment être effectué lorsque l'élément de sécurité est connecté au substrat du document de sécurité, ou immédiatement après, avant que le substrat ne soit traité de façon ultérieure ou stocké de façon intermédiaire (contrôle en ligne). De cette manière, il est possible d'obtenir une densité de contrôle de l'élément produit bien plus grande que dans le cas d'un contrôle hors ligne.
PCT/EP2004/006067 2003-06-13 2004-06-04 Controle de la conductivite electrique et/ou de proprietes magnetiques d'elements de securite dans des documents de securite WO2004111952A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10326698.4 2003-06-13
DE10326698A DE10326698A1 (de) 2003-06-13 2003-06-13 Prüfung elektrischer Leitfähigkeit und/oder magnetischer Eigenschaften von Sicherheitselementen in Sicherheitsdokumenten

Publications (1)

Publication Number Publication Date
WO2004111952A1 true WO2004111952A1 (fr) 2004-12-23

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PCT/EP2004/006067 WO2004111952A1 (fr) 2003-06-13 2004-06-04 Controle de la conductivite electrique et/ou de proprietes magnetiques d'elements de securite dans des documents de securite

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DE (1) DE10326698A1 (fr)
WO (1) WO2004111952A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008122745A1 (fr) * 2007-04-05 2008-10-16 Talaris Holdings Limited Appareil de manipulation de documents
DE102011002181A1 (de) * 2011-04-19 2012-10-25 Bundesdruckerei Gmbh Verfahren und Vorrichtung zur Überprüfung von Sicherheitsmerkmalen in Sicherheitsdokumenten
JP6026194B2 (ja) 2012-09-21 2016-11-16 株式会社東芝 紙葉類の再検査装置、紙葉類検査システム、及び紙葉類検査方法
CN105069892B (zh) * 2015-07-30 2018-10-19 深圳怡化电脑股份有限公司 介质识别装置

Citations (6)

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DE2319149A1 (de) * 1972-04-28 1973-10-31 Gao Ges Automation Org Verfahren und einrichtung zur echtheitspruefung von banknoten, wertpapieren und dergl
US4114032A (en) * 1973-05-11 1978-09-12 Dasy Inter S.A. Documents having fibers which are coated with a magnetic or magnetizable material embedded therein and an apparatus for checking the authenticity of the documents
DE2834287A1 (de) * 1978-08-04 1980-02-14 Gao Ges Automation Org Verfahren zur pruefung der magnetischen eigenschaften eines sicherheitsfadens in einem wertdruck
US4973851A (en) * 1989-04-07 1990-11-27 Rowe International, Inc. Currency validator
US5278500A (en) * 1991-04-26 1994-01-11 Landis & Gyr Betriebs Ag Planar, core saturation principle, low flux magnetic field sensor
DE19826800A1 (de) * 1998-06-16 1999-12-23 Frank Puttkammer Herstellung von Spezialpapieren zum Ursprungsnachweis mit elektrisch leitenden Merkmalsstoffen und Prüfung derselben

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JPH0674112B2 (ja) * 1986-04-23 1994-09-21 三菱重工業株式会社 シート状の紙の自動選別装置
DE19501245A1 (de) * 1995-01-17 1996-07-18 Giesecke & Devrient Gmbh Vorrichtung zur Prüfung magnetischer Eigenschaften von Blattgut, wie z. B. Banknoten oder Wertpapiere
DE19512921A1 (de) * 1995-03-30 1996-10-02 Lfp Elektronische Spezialsiche Einrichtung zur Prüfung von Sicherheitsdokumenten
DE29609070U1 (de) * 1996-05-10 1996-08-14 WHD Warenhandels- und Dienstleistungs GmbH, 01129 Dresden Prüfvorrichtung in Bearbeitungsmaschinen
DE19625224B4 (de) * 1996-06-24 2005-07-28 Giesecke & Devrient Gmbh Verfahren und Vorrichtungen zur Messung magnetischer Eigenschaften von Blattgut
DE19653403C2 (de) * 1996-10-21 2001-05-10 Koenig & Bauer Ag Verfahren zum Transport von Bogen
JP3483473B2 (ja) * 1998-07-28 2004-01-06 富士通株式会社 紙葉類判別装置および同装置におけるセンサ取付構造
GB0105509D0 (en) * 2001-03-06 2001-04-25 Rue De Int Ltd Detector system and method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2319149A1 (de) * 1972-04-28 1973-10-31 Gao Ges Automation Org Verfahren und einrichtung zur echtheitspruefung von banknoten, wertpapieren und dergl
US4114032A (en) * 1973-05-11 1978-09-12 Dasy Inter S.A. Documents having fibers which are coated with a magnetic or magnetizable material embedded therein and an apparatus for checking the authenticity of the documents
DE2834287A1 (de) * 1978-08-04 1980-02-14 Gao Ges Automation Org Verfahren zur pruefung der magnetischen eigenschaften eines sicherheitsfadens in einem wertdruck
US4973851A (en) * 1989-04-07 1990-11-27 Rowe International, Inc. Currency validator
US5278500A (en) * 1991-04-26 1994-01-11 Landis & Gyr Betriebs Ag Planar, core saturation principle, low flux magnetic field sensor
DE19826800A1 (de) * 1998-06-16 1999-12-23 Frank Puttkammer Herstellung von Spezialpapieren zum Ursprungsnachweis mit elektrisch leitenden Merkmalsstoffen und Prüfung derselben

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