EP3084731B1 - Magnetisierungseinrichtung zum prüfen eines sicherheitselements - Google Patents

Magnetisierungseinrichtung zum prüfen eines sicherheitselements Download PDF

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Publication number
EP3084731B1
EP3084731B1 EP14820744.2A EP14820744A EP3084731B1 EP 3084731 B1 EP3084731 B1 EP 3084731B1 EP 14820744 A EP14820744 A EP 14820744A EP 3084731 B1 EP3084731 B1 EP 3084731B1
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EP
European Patent Office
Prior art keywords
magnetic field
magnet
magnetic
transport
field strength
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EP14820744.2A
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German (de)
English (en)
French (fr)
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EP3084731A1 (de
Inventor
Jürgen Schützmann
Norbert Holl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
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Giesecke and Devrient Currency Technology GmbH
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    • 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

Definitions

  • the present invention relates to a magnetization device for a testing device for testing a magnetizable security element, a corresponding testing device, a value document processing device with a corresponding testing device, and corresponding operating methods.
  • a device for testing security elements which comprise magnetic materials of different coercivity.
  • the security element is first exposed to a first, stronger magnetic field region and as a result a high-coercive and a low-coercive magnetic material of the security element is pre-magnetized in a first magnetization direction.
  • the security element is then exposed to a second, weaker magnetic field region and the low-coercive magnetic material of the security element is thereby remagnetized so that it is then magnetized in a different direction than the high-coercive magnetic material.
  • the magnetization of the security element is then measured and evaluated in order to use the detected magnetic signals to distinguish between the magnetic areas with the high-coercive and the magnetic areas with the low-coercive magnetic material.
  • the U.S. 2008/0111544 A1 discloses a magnetizing device according to the preamble of claim 1.
  • a magnetization device is consequently set up to provide a first magnetic field area and a second magnetic field area in such a way that a security element transported along a transport area in a transport direction is transported through the first magnetic field area and therein has a first magnetic field strength with a first is exposed to the magnetic field direction and then transported through the second magnetic field region and exposed therein to a second magnetic field strength with a second magnetic field direction, the second magnetic field direction being different from the first magnetic field direction and the second magnetic field strength being smaller than the first magnetic field strength.
  • the magnetizing device comprises a first magnet and a second magnet which cooperatively generate both the first and the second magnetic field region.
  • the magnets are arranged such that the north pole of the first magnet and the north pole of the second magnet face each other with respect to the transport area and the south pole of the first magnet and the south pole of the second magnet also face each other with respect to the transport area.
  • the first and second magnets are designed as cuboid permanent magnets.
  • the magnetic poles face each other as described above, they are preferably arranged relative to one another in such a way that a first magnetic axis extending from the north pole to the south pole of the first magnet and a second magnetic axis extending from the north pole to the south pole of the second magnet are parallel and rectified to one another, in particular are at an angle of 0° to each other.
  • these magnetic axes are, for example, parallel or antiparallel to the transport direction of the document of value.
  • the magnetization device described above can also be used in a transport area that allows certain transport fluctuations to provide the two magnetic field areas in such a way that the two magnetic materials of the security element can be easily distinguished from one another after it has been magnetized.
  • the transport area preferably comprises a central transport plane which extends in the transport direction and which preferably runs in a straight line and is preferably located centrally between the magnets.
  • the transport area particularly preferably has a limited height both above and below the middle transport plane. This height is defined perpendicularly to the middle transport plane and is greater than or equal to 5%, 10% or even 25% of the distance between the two magnets from one another or greater than or equal to 0.2 mm, 0.5 mm, 1 mm or 2 mm . Suitable magnetization is therefore also achieved when the document of value is transported above or below the middle transport level and also in the event of considerable transport fluctuations within the transport area.
  • the two magnets are preferably set up, a security element transported (somewhere within the transport area) along the transport area in the transport direction through the two magnetic field areas with a first magnetic material with a first coercive field strength that is less than the first magnetic field strength and greater than the second magnetic field strength, and magnetize a second magnetic material having a second coercivity that is less than the first magnetic field strength and also less than the second magnetic field strength such that a resultant direction of magnetization of the first magnetic material and a resultant direction of magnetization of the second magnetic material are opposite to each other, in particular at an angle of 155° to 205°, preferably at an angle of 170° to 190° to one another.
  • the direction in which the magnetization of the second magnetic material deviates from that of the first magnetic material from the exactly antiparallel orientation (180°) is, for example, perpendicular to the transport plane of the security element (y-direction).
  • the magnetization of the second magnetic material can—relative to the magnetization of the first magnetic material—but also be twisted slightly in the z-direction (which runs perpendicular to the transport direction in the transport plane). This can be the case at the ends of the security element, or also when the magnetic axes of the first and second magnets are not aligned exactly parallel to one another.
  • the described opposite magnetization of the magnetic materials in turn enables a particularly simple and reliable evaluation.
  • the two magnets are preferably formed in a straight line. Also preferably, the magnetization device is mirror-symmetrical with respect to the transport area or its central transport plane. Furthermore, both magnets are preferably of the same strength and/or of identical shape. Ideally, two identical magnets are used.
  • a corresponding test device for testing a magnetizable security element accordingly comprises a magnetization device configured as described above and a magnetic sensor that is set up to detect at least one magnetic signal of a security element transported along the transport area, which emanates from the security element when it is transported through a detection area which is downstream of the first and the second magnetic field region in the transport direction.
  • the checking device preferably comprises a transport mechanism for transporting a security element in the transport direction along the transport area.
  • the checking device also includes at least one evaluation device that is set up to analyze the detected magnetic signal with regard to the presence and/or a position of a first magnetic material of the security element with a first coercive field strength that is less than the first magnetic field strength and greater than the second magnetic field strength, and a second magnetic material of the security element with a second coercive field strength, which is smaller than the first magnetic field strength and also smaller than the second magnetic field strength.
  • the evaluation device can be set up, for example, to evaluate the detected magnetic signal with regard to the presence and/or the position of a first magnetic area of the security element, which has the first but not the second magnetic material, and/or a second magnetic area of the security element, which does not have the second however, comprises the first magnetic material.
  • the evaluation preferably includes evaluating the detected magnetic signal with regard to a magnetic coding of the security element, which is formed by the first magnetic material and/or the second magnetic material, in particular by their sequence and/or arrangement on the security element.
  • another magnetic sensor may be present, which is set up to detect at least one magnetic signal of a security element transported along the transport area, which emanates from a second detection area downstream of the first and the second magnetic field area in the transport direction. If required, the second detection area can be subjected to a third magnetic field.
  • the evaluation device is preferably set up, the at least one first magnetic signal in combination with the at least one second magnetic signal with regard to the presence and/or the position of a first magnetic area of the security element, which has the first but not the second magnetic material, and/or a second magnetic area of the security element, which has the second but not the first magnetic material, and possibly a third magnetic region of the security element, which has the first and the second magnetic material.
  • a value-document processing device comprises a checking device, as has been described above.
  • the value-document processing device can in particular be a device for depositing and/or paying out value documents or for processing value documents, such as a banknote processing machine for checking banknotes.
  • the magnetization device or test device described above is provided, wherein the aforesaid first magnetic field strength of the first magnetic field region is greater than the first and second coercive forces of the magnetic materials and the second magnetic field strength of the second magnetic field region is less than the first coercive force and greater than the second coercive force of the magnetic materials.
  • the security element is then transported along the transport path in the transport direction in order to expose the two magnetic materials to the first and second magnetic field region one after the other.
  • both magnetic materials are magnetized by the first magnetic field area and only the second magnetic material is remagnetized by the second magnetic field area, but not the first, whose magnetization caused by the first magnetic field area remains.
  • a magnetization device is preferably used here, which magnetizes the two magnetic materials in such a way that a resulting direction of magnetization of the first magnetic material and a resulting direction of magnetization of the second magnetic material are opposite to one another, in particular at an angle of 155° to 205°, preferably at an angle of 170 ° up to 190° to each other.
  • the first and second magnets are preferably arranged in such a way that - viewed along the transport direction - at that position of the second magnetic field region at which the magnetic field strength directed along the transport direction falls below the coercive field strength of the low-coercive magnetic material, the magnetic field strength perpendicular to the transport plane is negligibly small compared to the magnetic field strength directed along the transport direction at this position.
  • the magnetic field strength directed perpendicularly to the transport plane at this position is less than 20%, preferably less than 10%, of the magnetic field strength directed along the transport direction.
  • the magnetic field strength of the magnetic field directed along the transport direction has a maximum in the first magnetic field region - viewed along the transport direction - which is at least 50%, in particular at least a factor of 2, greater than the maximum that the magnetic field strength of the magnetic field directed perpendicular to the transport plane Magnetic field has in the first magnetic field range.
  • At least one magnetic signal emanating from the security element magnetized as described is detected and can be evaluated with regard to the presence and/or a position of the first magnetic material of the security element and/or the second magnetic material of the security element, preferably as described above.
  • figure 1 shows schematically a section of a value document processing device 101 according to the invention. This in turn comprises a checking device 100 and optionally further elements (not shown), such as input and output devices for value documents and operating elements.
  • the testing device 100 in turn includes a magnetization device 10 and other elements.
  • the checking device 100 serves to check the magnetizable security element 31 of the document of value 30 .
  • the security element 31 has a first (high-coercivity) magnetic material with a first coercivity and a second (low-coercivity) magnetic material with a second, lower coercivity.
  • a high-coercive magnetic material area h of the security element 31 contains only the high-coercive magnetic material, but not the low-coercive magnetic material
  • a low-coercive magnetic material area 1 of the security element 31 only has the low-coercive magnetic material but not the high-coercive magnetic material
  • a combined magnetic material area k of the security element 31 has both aforementioned magnetic materials.
  • the security element 31 may not have a combined magnetic material area, but rather only one or more high- and low-coercive magnetic areas or only one type of these magnetic materials.
  • the existing magnetic material areas h or 1 or h, 1 or h, k, 1 form, for example, a magnetic coding of the security element 31.
  • the document of value 30 can be transported together with the security element 31 along a transport area 20 by means of the transport device 17 which is part of the magnetization device 10 .
  • the transport device 17 has, for example, a plurality of transport belts for belt transport of the documents of value 30 and/or transport rollers. In figure 1 two upper and three lower transport belts are shown as an example, between which the document of value 30 is clamped and transported.
  • the transport area 20, which also extends above and below the middle transport plane 21, comprises a middle transport plane 21, along which the document of value 30 with the security element 31 is transported in the transport direction T, ideally. However, it is also possible to transport the document of value 30 together with the security element 31 above and below the middle transport plane 21 in the transport direction T.
  • Transporting the document of value above or below the middle transport plane 21 may be necessary for reasons of space, for example, if the distance between the magnets 11, 12 is to be as small as possible, but the transport belts still have to be guided between the two magnets 11,12. discrepancies during transport along the middle transport plane 21 do not impair the checking of the security element 31 as long as the transport takes place within the transport area 20 .
  • the magnetization device 10 Before the security element 31 is checked, it is magnetized by means of the magnetization device 10, which in the present case comprises the magnet 11 and the magnet 12, in such a way that the magnetization directions of the two aforementioned magnetic materials are opposite to one another.
  • the magnetization device 10 provides a first magnetic field area along the transport area 20 and a second magnetic field area downstream of the first magnetic field area in the transport direction T in such a way that a security element 31 transported along the transport area 20 in the transport direction T is initially in the first magnetic field area of a first magnetic field pointing in a first magnetic field direction magnetic field strength that is greater than the coercive field strength of the two magnetic materials, and then exposed in a second magnetic field area to a second magnetic field strength pointing in a different, second magnetic field direction, which is greater than the coercive field strength of the low-coercive magnetic material, but smaller than the coercive field strength of the high-coercive magnetic material.
  • both magnetic materials are first magnetized in the first magnetic field area and then only the low-coercive magnetic material (opposite) is remagnetized in the second magnetic field area, whereas the magnetization of the high-coercive magnetic material generated by the first magnetic field area remains.
  • the two magnetic materials are then magnetized in opposite directions of magnetization.
  • first magnetic sensor line 40 which preferably comprises a plurality of sensor elements 41 for spatially resolved detection
  • second magnetic sensor line 50 which also preferably comprises a plurality of sensor elements 51 for spatially resolved detection.
  • another magnetic field acts on the security element 31, which is generated by the magnet 52, which can be oriented in exactly the same way as the magnets 11, 12.
  • the further magnetic field can also be generated by another magnet, e.g. a horseshoe-shaped magnet.
  • the detection of the magnetic signals by the sensor rows 40, 50 can also be carried out without an additional magnetic field.
  • non-position-resolving sensors can also be used, in which case the magnetic material areas h, k, 1 then have to be guided past the sensors sequentially.
  • the magnetic signals detected in this way are then evaluated by the evaluation device 60 with regard to the presence of the previously described magnetic material regions h, k, 1 and their sequence and arrangement in order to check the magnetic coding of the security element 31 .
  • a suitable magnetization device 10 is accordingly first provided (step S1) and the security element 31 is transported in the transport direction T along the transport area 20 (step S2), whereby the two magnetic materials are magnetized, as described above. Then, by means of the sensor lines 40, 50, outgoing magnetic signals from the security element 31 detected (step S4) and evaluated by the evaluation device 60.
  • the two magnetic field areas described above are generated by (only) the two magnets 11 , 12 .
  • the two magnets are arranged in such a way that their north poles N are opposite one another with regard to the transport area 20 and at the same time their south poles S are also opposite one another with regard to the transport area.
  • the two magnets 11, 12 are configured identically, in particular they have the same shape and the same strength (remanent magnetization).
  • their magnetic axes 13 and 14 are aligned parallel to one another and to the transport direction T.
  • the magnets 11, 12 are arranged at a distance of 5 mm from one another, ie in the figure 1
  • the visible gap between the magnets is 5 mm wide everywhere and 10 mm long in the x-direction.
  • the magnets 11, 12 have, for example, a remanent magnetization of 1.4 Tesla.
  • the magnets 11, 12 can also be arranged at a greater distance from one another (>5 mm).
  • the magnetic field lines of the magnetic field generated by such a magnetization device 10 are in figure 3 shown schematically. while showing figure 3 these magnetic field lines in a to the x- and the y-axis of figure 1 parallel plane that intersects the two magnets 11 and 12 in the middle.
  • the y-component of the magnetic field is exactly in the middle between the magnets 11, 12 zero. Accordingly, it is preferred to transport the security element 31 exactly along the middle transport plane 21 in order to achieve an exactly anti-parallel magnetization of the two magnetic materials in the plane of the security element 31.
  • the magnetic materials can be magnetized opposite to one another.
  • the magnetic field strength in the y-direction (graph 1005), i.e. perpendicular to the transport direction T, is much lower for the two-sided magnet arrangement than for the one-sided magnet arrangement (graph 1006).
  • the maximum of the magnetic field strength Hy acting on the security element 31, which is reached at the x-position M can be further reduced. This can be achieved in that the transport level of the document of value is shifted further in the direction of the middle transport level 21 .
  • FIG. 4b shows the magnetic field strengths for the case when the document of value is transported 2.5 mm (instead of 1 mm) above the lower magnet 12, ie exactly in the middle transport plane 21. Due to the axially symmetrical arrangement of the magnets 11, 12 to the transport plane 21 in this case, the magnetic field strength in the y-direction Hy is equal to zero for all x-positions, see graph 1005 in Figure 4b .
  • the direction of the magnetic field at this x-position x1 is decisive for the resulting magnetization of the low-coercive magnetic material. Since Hy «Hx, the magnetic field at point x1 and thus also the resulting magnetization of the low-coercive magnetic material are aligned essentially anti-parallel to the x-direction, i.e. opposite to the magnetization of the high-coercive magnetic material.
  • the magnetization device 10 and the checking device 100 also function when the security element 31 is transported within a transport area 20 that also extends above and below the middle transport plane 21.
  • Graph 1004 and 1006 in Figure 4a which leads to a very strongly twisted magnetization in the y-direction of the high-coercive magnetic material.
  • the magnetic field strength Hy in the y-direction (graph 1006) at the point x2 at which the magnetic field strength Hx in the x-direction (graph 1004) of the magnetization device falls below the coercive field strength H KL of the low-coercive magnetic material in the case of the one-sided magnet is significantly greater than zero , approximately the size of Hx.
  • the magnetic field at point x2 is therefore also strongly twisted in the y-direction, i.e. aligned at an angle to the transport direction T, cf. Figures 4a and 4b .
  • the low-coercive magnetic material is also magnetized obliquely to the transport direction T, but in a completely different direction than the high-coercive magnetic material (reversed x-components). Therefore, in the prior art magnetizing device (single-sided magnet), approximately opposite magnetization of the two magnetic materials cannot be obtained. This applies not only to the distance of 1mm, but also to larger and smaller distances from the individual magnet 12.
  • the magnetization device 10 provides a very high maximum magnetic field strength in the x-direction compared to the prior art, so that magnetic materials with a particularly high coercive field strength can also be magnetized. This is not only the case when transporting at a distance of 1 mm from the lower magnet 12, ie 1.5 mm below the middle transport plane 21, cf. Figure 4a , but also at other distances, cf. Figure 4b .
  • the maximum magnetic field strength Hx in the x-direction occurring between the magnetic poles at the x-position of 30 mm according to Figure 4a and 4b occurs as a function of the distance from the lower magnet 12 in the y-direction.
  • the maximum magnetic field strength changes Hx graph 1002, which is provided by the magnetization device 10 according to the invention, which uses the two opposing magnets 11, 12, hardly occurs during transport significantly above and below the middle transport plane 21.
  • the magnetization device according to the prior art which only has a magnet on one side, the maximum magnetic field strength Hx falls sharply with increasing distance from the (lower) individual magnet (graph 1001), so that magnetization only occurs at a small distance from the magnet of a magnetic material with a relatively high coercivity is even possible.
  • a very small distance from the magnet 12 brings with it an increased risk with regard to transport disruptions of the document of value transported past.
  • the magnetization of the security element 31 with the aid of the magnetization device of the prior art is also much more susceptible to transport fluctuations (directed in the y-direction) of the document of value 30.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
EP14820744.2A 2013-12-20 2014-12-12 Magnetisierungseinrichtung zum prüfen eines sicherheitselements Active EP3084731B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013021969.8A DE102013021969A1 (de) 2013-12-20 2013-12-20 Magnetisierungseinrichtung zum Prüfen eines Sicherheitselements
PCT/EP2014/003337 WO2015090545A1 (de) 2013-12-20 2014-12-12 Magnetisierungseinrichtung zum prüfen eines sicherheitselements

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EP3084731A1 EP3084731A1 (de) 2016-10-26
EP3084731B1 true EP3084731B1 (de) 2023-04-26

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EP (1) EP3084731B1 (zh)
CN (1) CN105765633B (zh)
DE (1) DE102013021969A1 (zh)
PT (1) PT3084731T (zh)
WO (1) WO2015090545A1 (zh)

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Publication number Priority date Publication date Assignee Title
DE102015002219A1 (de) 2015-02-24 2016-08-25 Meas Deutschland Gmbh Vormagnetisierungsmagnet und Messvorrichtung zum Messen magnetischer Eigenschaften der Umgebung der Messvorrichtung sowie Verfahren zur Vormagnetisierung magnetischer Materialien auf einem Messobjekt
DE102018008519A1 (de) * 2018-10-30 2020-04-30 Giesecke+Devrient Currency Technology Gmbh Magnetische Prüfung von Wertdokumenten
DE102019200361A1 (de) 2019-01-14 2020-07-16 TE Connectivity Sensors Germany GmbH Magnetisierungseinrichtung mit reduziertem Streufeld
CN110738785A (zh) * 2019-09-19 2020-01-31 中钞特种防伪科技有限公司 用于磁性防伪元件的检测方法及设备

Citations (1)

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WO2014168180A1 (ja) * 2013-04-09 2014-10-16 グローリー株式会社 磁気質判別装置及び磁気質判別方法

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DE2834287C2 (de) * 1978-08-04 1984-03-22 GAO Gesellschaft für Automation und Organisation mbH, 8000 München Vorrichtung zur Echtheitsprüfung ferromagnetischer Sicherheitsfäden in Wertdrucken
DE102004049999A1 (de) * 2004-10-14 2006-04-20 Giesecke & Devrient Gmbh Sicherheitselement
GB0519971D0 (en) 2005-09-30 2005-11-09 Rue De Int Ltd Method and apparatus for detecting a magnetic feature on an article
US7538546B2 (en) * 2006-11-10 2009-05-26 Infinitum Solutions, Inc. In-plane magnetic field generation and testing of magnetic sensor
DE102008061507A1 (de) * 2008-12-10 2010-06-17 Giesecke & Devrient Gmbh Magnetsensor zur Prüfung von Wertdokumenten
RU2549137C2 (ru) 2010-06-09 2015-04-20 Гизеке Унд Девриент Гмбх Способ и устройство для проверки ценных документов
DE102011109949A1 (de) * 2011-08-10 2013-02-14 Giesecke & Devrient Gmbh Prüfanordnung zur Wertdokumentprüfung

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DE102013021969A1 (de) 2015-06-25
CN105765633A (zh) 2016-07-13
CN105765633B (zh) 2019-04-02
EP3084731A1 (de) 2016-10-26
WO2015090545A1 (de) 2015-06-25
PT3084731T (pt) 2023-06-07

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