WO2015090545A1 - Dispositif de magnétisation pour la vérification d'un élément de sécurité - Google Patents

Dispositif de magnétisation pour la vérification d'un élément de sécurité Download PDF

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Publication number
WO2015090545A1
WO2015090545A1 PCT/EP2014/003337 EP2014003337W WO2015090545A1 WO 2015090545 A1 WO2015090545 A1 WO 2015090545A1 EP 2014003337 W EP2014003337 W EP 2014003337W WO 2015090545 A1 WO2015090545 A1 WO 2015090545A1
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WO
WIPO (PCT)
Prior art keywords
magnetic field
magnetic
transport
security element
field strength
Prior art date
Application number
PCT/EP2014/003337
Other languages
German (de)
English (en)
Inventor
Jürgen Schützmann
Norbert Holl
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
Priority to CN201480064308.0A priority Critical patent/CN105765633B/zh
Priority to EP14820744.2A priority patent/EP3084731B1/fr
Publication of WO2015090545A1 publication Critical patent/WO2015090545A1/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

Definitions

  • the present invention relates to a magnetization device for a test device for testing a magnetizable security element, a corresponding test device, a value-document processing device with a corresponding test device and corresponding operating methods.
  • a device for testing of security elements comprising magnetic materials of different coercive field strength.
  • the security element is first exposed to a first, stronger magnetic field region and thereby a high-coercive and a low-coercive magnetic material of the security element is premagnetized in a first direction of magnetization.
  • the security element is exposed to a second, weaker magnetic field region and thereby magnetized around the low-coercive magnetic material of the security element, so that it is then magnetized in a different direction than the high-coercive magnetic material.
  • the magnetization of the security element is measured and evaluated in order to distinguish, on the basis of the detected magnetic signals, the magnetic areas with the high-coercive and the magnetic areas with the low-coercive magnetic material.
  • both magnetic field areas described above are inexpensively generated by means of only one magnet.
  • the magnetic field very is inhomogeneous, so that caused by random transport fluctuations changes in the transport path of the value document have a great influence on the resulting magnetization, whereby a distinction of the magnetic materials based on the magnetic signals is difficult.
  • no antiparallel magnetization of the high and low-coercivity magnetic materials can be achieved there.
  • a magnetization device is consequently set up to provide a first magnetic field region and a second magnetic field region such that a security element transported along a transport region in a transport direction is transported through the first magnetic field region and within a first magnetic field strength with a first magnetic field Magnetic field direction is exposed and then transported by the second magnetic field eld Scheme and is exposed therein a second magnetic field strength with a second magnetic field direction, wherein the second magnetic field direction is different from the first magnetic field direction and the second magnetic field strength is smaller than the first magnetic field strength.
  • the magnetizer includes a first magnet and a second magnet cooperatively generating both the first and second magnetic field regions.
  • the magnets are arranged such that the north pole of the first magnet and the
  • first and second magnets are in each case integrally formed permanent magnets, which allows a particularly simple construction.
  • the first and second magnets are formed 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 one from the other
  • North pole to the south pole of the first magnet extending first magnetic axis and extending from the north pole to the south pole of the second magnet second magnetic axis are parallel and rectified to each other, in particular at an angle of 0 ° to each other.
  • These magnetic axes are, for example, parallel or antiparallel to the transport direction of the value document.
  • the two magnetic field regions can also be provided in a transport region which permits certain transport fluctuations such that the two magnetic materials of the security element can be well distinguished from each other after being magnetized.
  • the transport region comprises a transport plane extending in the transport direction central transport plane, which preferably is rectilinear and is preferably located centrally between the magnets.
  • the transport area has a limited height both above and below the central transport plane. This height is defined perpendicular to the central transport plane and is greater than or equal to 5%, 10% or even 25% of the distance of the two magnets from each other or greater than or equal to 0.2 mm, 0.5 mm, 1 mm or 2 mm , Therefore, a suitable magnetization is achieved even when transporting the value document above or below the average transport level and even with significant transport fluctuations within the transport area.
  • the two magnets are arranged, one (somewhere within the transport area) along the transport region in the transport direction through the two magnetic field transported safety element with a first magnetic material having a first coercive field strength which is smaller than the first magnetic field strength and greater than the second magnetic field strength and a second magnetic material having a second coercive force smaller than the first magnetic field strength and also smaller than the second magnetic field strength, such that a resultant magnetization direction of the first magnetic material and a resultant magnetization direction of the second magnetic material are opposite. lie to each other, in particular at an angle of 155 ° to 205 °, preferably at an angle of 170 ° to 190 ° to each other.
  • the direction in which the magnetization of the second magnetic material deviates from that of the first magnetic material from the exact antiparallel orientation (180 °) is eg perpendicular to the transport plane of the security element (y-direction).
  • the magnetization of the second magnetic material can-but also be slightly rotated in the z-direction (which runs in the transport plane perpendicular to the transport direction) relative to the magnetization of the first magnetic material. This may be the case at the ends of the security element, or even if the magnetic axes of the first and second magnets are not aligned exactly parallel to each other.
  • the described opposite magnetization of the magnetic materials in turn allows a particularly simple and reliable evaluation.
  • the two magnets are preferably rectilinear. Also preferably, the magnetization device is mirror-symmetrical with respect to the transport region or its central transport plane. Further preferably, both magnets are equally strong and / or of identical shape. Ideally, two identical magnets are used.
  • a corresponding test device for testing a magnetizable safety element accordingly comprises a magnetization device configured as described above and a magnetic sensor which is set up to detect at least one magnetic signal of a security element transported along the transport region, which originates from the security element when it is transported through a detection region is downstream of the first and the second magnetic field region in the transport direction.
  • the test device preferably comprises a transport mechanism for transporting a security element in the transport direction along the transport area.
  • the test device further comprises at least one evaluation device which is set up, the detected magnetic signal with respect to the presence and / or position of a first magnetic material of the security element with a first coercive field strength which is smaller than the first magnetic field strength and greater than the second magnetic field strength, and a second magnetic material of the security element having a second coercive force which is smaller than the first magnetic field strength and also smaller than the second magnetic field strength to evaluate.
  • the evaluation device may e.g. be configured to evaluate the detected magnetic signal with respect to the presence and / or position of a first magnetic portion of the security element having the first, but not the second magnetic material, and / or a second magnetic portion of the security element, the second, but not the first magnetic material having.
  • the evaluation comprises that the detected magnetic signal is evaluated 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.
  • 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.
  • yet another magnetic sensor is provided which is adapted to detect at least one magnetic signal transported along the transport area security element, the one of the first and the second magnetic field region in the transport direction downstream second detection range emanates. The second detection area can be acted upon if necessary with 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 respect to the presence and / or the position of a first magnetic region of the security element having the first, but not the second magnetic material, and / or a second magnetic region the security element, which has the second, but not the first magnetic material, and possibly a third magnetic region of the security element having the first and the second magnetic material to evaluate.
  • a value-document processing device comprises a test device as described above.
  • the value document processing device can be a device for depositing and / or paying out value documents or for processing value documents, such as a bank note 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 larger than the first and second coercive magnetic field strengths and the second magnetic field strength of the second magnetic field region is smaller than the first coercive force and greater than the second coercive force of the magnetic materials.
  • the security element is then transported in the transport direction along the transport path to expose the two magnetic materials sequentially to the first and the second magnetic field range.
  • both magnetic materials are magnetized by the first magnetic field region and only the second magnetic material is magnetized by the second magnetic field region, but not the first whose magnetization caused by the first magnetic field region remains.
  • a magnetizing device which magnetizes the two magnet materials in such a way that a resulting magnetization direction of the first magnet material and a resulting magnetization direction of the second magnet material are opposite to one another, in particular at an angle of 155 ° to 205 °, preferably at an angle of 170 ° ° to 190 ° to each other.
  • the first and second magnets are preferably arranged such that - as viewed along the transport direction - at the position of the second magnetic field region at which the magnetic field strength directed along the transport direction falls below the coercive force of the low-coercive magnetic material, the magnetic field strength directed perpendicularly to the transport plane is negligibly small in comparison to the magnetic field strength directed along the transport direction at this position.
  • carries the perpendicular to the transport plane directed magnetic field strength at this position less than 20%, preferably less than 10%, directed along the transport direction magnetic field strength.
  • the magnetic field direction is aligned at this position of the second magnetic field region, and thus the resulting magnetization of the low-coercive magnetic material, exactly parallel or anti-parallel to 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 - considered along the transport direction, which is greater than the maximum by at least 50%, in particular by at least a factor 2, which is the magnetic field strength perpendicular to Transport level directed magnetic field in the first magnetic field area.
  • a magnetization of the high-coercive magnetic material oriented more in the transport direction is achieved, which is oriented opposite to the magnetization of the low-coercive magnetic material.
  • Test device and a magnetization device Figure 2: a test method
  • FIG. 3 shows a highly schematic representation of the magnetic field lines generated by the magnetization device according to FIG. 1,
  • FIG. 4 that generated by the magnetization device according to FIG.
  • FIG. 5 shows the magnetic field strength generated by the magnetization device
  • FIG. 1 schematically shows a detail of an inventive value-document processing device 101.
  • This in turn comprises a test device 100 and optionally further elements (not shown), such as e.g. Input and output devices for value documents and operating elements.
  • the testing device 100 in turn comprises a magnetization device 10 and further elements.
  • the test device 100 serves to test the magnetizable security element 31 of the value document 30.
  • the security element 31 in this example has a first (high-coercive) magnetic material with a first coercive field strength and a second (low-coercive) magnetic material with a second, lower coercive field strength. These materials are arranged such that a high-coercive magnetic material area h of the security element 31 only contains the high-coercive magnetic field area h of the security element 31.
  • a low-coercive magnetic material region 1 of the security element 31 has only the low-coercive magnetic material, but not the high-coercive magnetic material, and a combined magnetic material region k of the security element 31 has both magnetic materials mentioned above.
  • the security element 31 may not have a combined magnetic material region but only one or more high and low coercive magnetic regions or else only one kind of these magnetic materials.
  • the existing magnetic material regions h or 1 or h, 1 or h, k, 1 form, for example, a magnetic coding of the security element 31.
  • the value document 30 together with the security element 31 can be transported along a transport region 20 by means of the transport device 17, which is part of the magnetization device 10.
  • the carrying device 17 has a plurality of transport belts for a belt transport of the value documents 30 and / or transport rollers.
  • FIG. 1 by way of example, two upper and three lower transport belts are shown, between which the value documentary 30 is clamped and transported.
  • the transport region 20, which also extends above and below the central transport plane 21, comprises a middle transport plane 21, along which the value document 30 with the security element 31 is transported in the transport direction T, ideally.
  • Transporting the value document above or below the middle transport plane 21 may be necessary for space reasons, for example, if it is as small as possible Distance between the magnets 11, 12 to be achieved, but still the transport belt between the two magnets 11, 12 hm prepareplain must be performed. Deviations in trans- Port along the central transport plane 21 do not affect the examination of the security element 31, as long as the transport takes place within the transport area 20.
  • the security element 31 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 magnet materials are opposite to one another.
  • the magnetization device 10 provides along the transport region 20 a first magnetic field region and a second magnetic field region downstream of the first magnetic field region in the transport direction T, such that a security element 31 transported along the transport region 20 in the transport direction T initially into a first magnetic field region .
  • Magnetic field direction facing first magnetic field strength which is greater than the coercive force of the two magnetic materials, is exposed and then exposed in a second magnetic field region pointing in another, second magnetic field direction second magnetic field strength, which is greater than the coercive force of the low coercive magnetic material, but smaller than the coercivity of the high coercivity magnetic material.
  • first both magnetic materials are magnetized in the first magnetic field region and subsequently only the low-coercive magnetic material is reversed in the second magnetic field region, whereas the magnetization of the high-coercive magnet material generated by the first magnetic field region remains.
  • the two magnetic materials are then magnetized in opposite magnetization directions.
  • magnetic signals emitted by the thus magnetized security element 31 are detected by means of a first magnetic sensor line 40, which preferably comprises a plurality of sensor elements 41 for spatially resolved detection, and a second magnetic sensor row 50, which likewise preferably comprises a plurality of sensor elements 51 for spatially resolved detection.
  • the security element 31 which is generated by the magnet 52, which can be oriented in the same way as the magnets 11, 12.
  • the additional magnetic field can also be generated by another magnet, for example a horseshoe-shaped magnet.
  • the detection of the magnetic signals by the sensor lines 40, 50 can also be carried out without a further magnetic field.
  • the magnetic signals thus detected 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 magnetizing device 10 is accordingly provided (step S 1) and the security element 31 is transported in the transporting direction T along the transporting region 20 (step S 2), as a result of which the two magnetic materials, such as previously described, magnetized. Subsequently, by means of the sensor lines 40, 50 from the security element 31 outgoing magnetic signals erfest (step S4) and evaluated by the evaluation device 60.
  • the two magnetic field areas described above are generated by means of (only) the two magnets 11, 12.
  • the two magnets are arranged such that their north poles N with respect to the transport area 20 are opposite and at the same time their south poles S with respect to the transport area also opposite.
  • the two magnets 11, 12 are designed identically, in particular they have the same shape and the same strength (remanent magnetization).
  • their magnetic axes 13 and 14 are aligned parallel to each other and to the transport direction T.
  • the magnets 11, 12 are arranged at a distance of 5 mm from each other, i.
  • the apparent in Figure 1 gap between the magnets is everywhere 5 mm wide and 10 mm long in the x direction.
  • the magnets 11, 12 have e.g. a remanent magnetization of 1.4 Tesla.
  • the magnets 11, 12 can also be arranged at a greater distance from each other (> 5 mm).
  • FIG. 3 shows these magnetic field lines in one of the x and y axes of FIG 1 parallel plane which 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 central transport plane 21 in order to achieve exactly antiparallel magnetization of the two magnetic materials in the plane of the security element 31.
  • the magnetic materials can be magnetized opposite to each other.
  • the graph 1003 shows the magnetic field strength Hx in the x-direction (corresponds to the transport direction T) and the graph 1005 shows the magnetic field strength Hy in the perpendicular y-direction.
  • the coercive force HL of a low-coercitive is exemplified Magnetic material of 30 kA / m and the coercive force HH of a highly coercive magnetic material of 275 kA / m drawn.
  • the magnetic field strength in the y-direction (graph 1005), that is to say perpendicular to the transport direction T, is much lower in the case of the two-sided magnet arrangement than in the one-sided magnet arrangement (graph 1006).
  • the maximum of the force acting on the security element 31 magnetic field strength Hy which is achieved at the x-position M, can be further reduced. This can be achieved by shifting the transport level of the value document further in the direction of the mean transport level 21.
  • the example of Fig. 4b shows the magnetic field strengths for the case when the document of value is 2.5 mm (instead of 1 mm) above the lower magnet 12, i.
  • Graph 1005 in Fig. 4a For the resulting magnetization of the low-coercive magnetic material, it is decisive which direction the magnetic field has at this x-position xl.
  • the magnetic field at point xl and thus also the resulting magnetization of the low-coercive magnet material, is oriented essentially antiparallel to the x-direction, ie opposite to the magnetization of the highly coercive magnetic material.
  • Hy «Hx the magnetic field at point xl, and thus also the resulting magnetization of the low-coercive magnet material, is oriented essentially antiparallel to the x-direction, ie opposite to the magnetization of the highly coercive magnetic material.
  • the graphs are 1004 in the same figure and 1006 representing the respective magnetic field strengths Hx and Hy, respectively, for a magnetizing device according to the teaching of EP 1 770 657 A2 having only the lower magnet 12 (with magnetic data as in the present embodiment). It can be seen that the maximum value of the magnetic field strength Hy in the y-direction occurring in the x-position M in the invention (graph 1005) is always substantially lower than in the case of the invention
  • the magnetic field strength Hy in the y direction (graph 1006) at the point x2 at which the magnetic field intensity Hx in the x direction (graph 1004) of the magnetization device in the one-sided magnet falls below the coercive force HL of the low-coercive magnetic material is significantly larger than Zero, almost as big as Hx.
  • the magnetic field is therefore also strongly rotated in the y direction at the point x2, that is to say oriented obliquely to the transport direction T, cf. Fig. 4a and 4b. Soroit also magnetizes the low-coercive magnetic material obliquely to the transport direction T, but in a completely different direction than the high-coercive magnetic material (inverted x-components). Therefore, in the magnetization segregation according to the prior art (single-sided magnet), approximately opposite magnetization of the two magnetic materials can not be achieved. This is true not only for the distance 1mm, but also for larger and smaller distances from the single magnet 12th
  • the magnetizing device 10 provides a very large maximum magnetic field strength in the x direction compared with the prior art, so that magnet materials with a particularly large coercive field strength can be magnetized therewith. This is not only in the transport at 1 mm distance from the lower magnet 12, i. 1.5 mm below the middle transport plane 21, the case, cf. Fig. 4a, but also at other distances, cf. Fig. 4b.
  • the maximum magnetic field intensity Hx in the x-direction occurring between the magnetic poles at the x-position of 30 mm in FIGS. 4a and 4b is plotted as a function of the distance from the lower magnet 12 in the y-direction.
  • Maxi changes malmagnetf eidschreib Hx (graph 1002), which is provided by the magnetizing device 10 according to the invention, which uses the two opposing magnets 11, 12, when transporting significantly above and below the central transport plane 21 barely.
  • a preferred transport plane along which the security element would be transported in the absence of transport fluctuations, emerges, which lies centrally between the two magnets 11 and 12. Because there Hy is vanishingly small.
  • a preferred transport plane can also be closer to one of the two magnets in order to free space for a transport mechanism, in particular transport belts, on one side of the transport plane.
  • transport rollers instead of transport belts
  • the value document can be transported in the middle transport plane.

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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)

Abstract

L'invention concerne la magnétisation d'un élément de sécurité (31) magnétisable dans le cadre d'une vérification dudit élément. On utilise le long d'un secteur de transport (20) deux secteurs de champ magnétique (15, 16) ayant chacun une direction de champ magnétique différente. L'intensité de champ magnétique du secteur de champ magnétique (16) placé en aval est plus petite que l'intensité de champ magnétique du premier secteur de champ magnétique (15) dans la direction de transport. Selon la présente invention, on emploie deux aimants (11, 12) servant à la génération par coopération des deux secteurs de champ magnétique (15, 16). Ces derniers sont disposés dans ce but de telle manière que le pôle Nord et le pôle Sud du premier aimant (11) et du second aimant (12) sont placés respectivement l'un en face de l'autre par rapport au secteur de transport (20).
PCT/EP2014/003337 2013-12-20 2014-12-12 Dispositif de magnétisation pour la vérification d'un élément de sécurité WO2015090545A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201480064308.0A CN105765633B (zh) 2013-12-20 2014-12-12 用于检验安全元件的磁化装置
EP14820744.2A EP3084731B1 (fr) 2013-12-20 2014-12-12 Dispositif de magnétisation pour la examination d'un élément de sécurité

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
DE102013021969.8 2013-12-20

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WO2015090545A1 true WO2015090545A1 (fr) 2015-06-25

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PCT/EP2014/003337 WO2015090545A1 (fr) 2013-12-20 2014-12-12 Dispositif de magnétisation pour la vérification d'un élément de sécurité

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

Cited By (2)

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Publication number Priority date Publication date Assignee Title
EP3262432B1 (fr) 2015-02-24 2019-01-30 TE Connectivity Sensors Germany GmbH Aimant de polarisation et dispositif de mesure permettant de mesurer des propriétés magnétiques de l'environnement du dispositif de mesure et procédé permettant de polariser des matériaux magnétiques sur un objet de mesure
US20200227193A1 (en) * 2019-01-14 2020-07-16 Te Connectivity Germany Gmbh Magnetizing Device With Reduced Stray Field

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DE102018008519A1 (de) * 2018-10-30 2020-04-30 Giesecke+Devrient Currency Technology Gmbh Magnetische Prüfung von Wertdokumenten
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

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DE102011106263A1 (de) * 2010-06-09 2011-12-15 Giesecke & Devrient Gmbh Verfahren und Vorrichtung zur Prüfung von Wertdokumenten
DE102011109949A1 (de) * 2011-08-10 2013-02-14 Giesecke & Devrient Gmbh Prüfanordnung zur Wertdokumentprüfung

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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
DE102008061507A1 (de) * 2008-12-10 2010-06-17 Giesecke & Devrient Gmbh Magnetsensor zur Prüfung von Wertdokumenten
JP6049864B2 (ja) * 2013-04-09 2016-12-21 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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US20080111544A1 (en) * 2006-11-10 2008-05-15 Infinitum Solutions, Inc. In-Plane Magnetic Field Generation
DE102011106263A1 (de) * 2010-06-09 2011-12-15 Giesecke & Devrient Gmbh Verfahren und Vorrichtung zur Prüfung von Wertdokumenten
DE102011109949A1 (de) * 2011-08-10 2013-02-14 Giesecke & Devrient Gmbh Prüfanordnung zur Wertdokumentprüfung

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Publication number Priority date Publication date Assignee Title
EP3262432B1 (fr) 2015-02-24 2019-01-30 TE Connectivity Sensors Germany GmbH Aimant de polarisation et dispositif de mesure permettant de mesurer des propriétés magnétiques de l'environnement du dispositif de mesure et procédé permettant de polariser des matériaux magnétiques sur un objet de mesure
EP3262432B2 (fr) † 2015-02-24 2022-01-19 TE Connectivity Sensors Germany GmbH Procédé permettant de polariser des matériaux magnétiques sur un objet de mesure
US20200227193A1 (en) * 2019-01-14 2020-07-16 Te Connectivity Germany Gmbh Magnetizing Device With Reduced Stray Field
US11955278B2 (en) * 2019-01-14 2024-04-09 Te Connectivity Germany Gmbh Magnetizing device with reduced stray field

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Publication number Publication date
DE102013021969A1 (de) 2015-06-25
CN105765633A (zh) 2016-07-13
EP3084731A1 (fr) 2016-10-26
PT3084731T (pt) 2023-06-07
CN105765633B (zh) 2019-04-02
EP3084731B1 (fr) 2023-04-26

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