EP1181672A1 - Dispositif pour detecter un element d'identification magnetique d'un objet a controler - Google Patents

Dispositif pour detecter un element d'identification magnetique d'un objet a controler

Info

Publication number
EP1181672A1
EP1181672A1 EP00914004A EP00914004A EP1181672A1 EP 1181672 A1 EP1181672 A1 EP 1181672A1 EP 00914004 A EP00914004 A EP 00914004A EP 00914004 A EP00914004 A EP 00914004A EP 1181672 A1 EP1181672 A1 EP 1181672A1
Authority
EP
European Patent Office
Prior art keywords
magnetic field
field sensors
magnetic
sensors
transport path
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP00914004A
Other languages
German (de)
English (en)
Inventor
Martin Paping
Markus Jungen
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.)
De la Rue International Ltd
Original Assignee
De la Rue International Ltd
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 De la Rue International Ltd filed Critical De la Rue International Ltd
Priority to EP00914004A priority Critical patent/EP1181672A1/fr
Publication of EP1181672A1 publication Critical patent/EP1181672A1/fr
Withdrawn legal-status Critical Current

Links

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 invention relates to a device for detecting a test object provided with a magnetic identifier and guided on a transport path with a plurality of magnetic field sensors and at least one magnetization means. Furthermore, the invention relates to a bank note checking machine with such a device. State of the art
  • Sensor arrangements are also known with which the different strip spacings of a US banknote can be detected.
  • WO 94/12952 is cited as an example.
  • two or more sensors are placed next to one another, at a distance corresponding to the period of the respective stripe pattern. So e.g. To differentiate between three different stripe patterns, three different sensor arrangements with typically three magnetoresistive sensors arranged next to each other are required.
  • the object of the invention is to provide a device of the type mentioned at the outset, which is suitable for checking a multiplicity of different magnetic identification features without the need for a structural change.
  • test device for banknotes comprises the largest possible number of magnetic field sensors and at least one magnetizing means for magnetizing a test area.
  • the magnetic field sensors and the magnetization means each extend over the entire width of the transport path of the banknote, the magnetic field sensors being accommodated in a structural unit which extends over an entire width of the transport path.
  • the invention makes it possible to equip automatic test machines for different currencies with a standardized test device for checking the magnetic identification of whatever type.
  • the differentiation related to the test object can be achieved purely in software. In other words, the hardware is the same for all applications, only a different (specific) software is loaded.
  • the magnetization means are advantageously housed outside or together with the magnetic field sensors within the assembly.
  • the field for premagnetizing or saturating the layer can also be generated with electromagnetic means.
  • the magnetic field sensors used are preferably the Hall element sensors of the type described in EP 0 772 046 A2 (Sentron AG). These can be integrated in a chip and take up little space. They can detect low field strengths parallel to the chip surface and are relatively insensitive to external interference fields (for example also to stray fields from the magnetization means).
  • a magnetic field sensor of the type described has two flux concentrators with an air gap between them and at least one Hall element outside the air gap. At least some of the magnetic field lines leading from the first flux concentrator to the second flux concentrator flow through the Hall element.
  • the sensors mentioned can be integrated on a chip using the known techniques of microelectronics. Such a so-called cylindrical Hall element is sensitive to the magnetic field that is parallel to the surface in which the magnetic flux concentrators are integrated. Overall, such an element is particularly well adapted to the direction of magnetization of the banknote.
  • the sensors can be constructed in two rows arranged offset from one another.
  • the sensors in the rear row are therefore in the spaces between those in the front row.
  • the two rows are arranged as close together as possible.
  • the distance between the rows is e.g. in the order of the distance between the sensors within a row. If the banknotes are transported transversely to their longitudinal direction, several dozen sensors are typically provided per row according to the invention. In this way, a geometric resolution in the range of a few millimeters can be achieved.
  • the magnetic field sensors are advantageously arranged on a plate-shaped carrier element, which is attached on the end face and essentially perpendicular to a circuit board for signal processing.
  • the carrier element (with all Hall sensors) is considerably smaller than the circuit board mentioned (which can be equipped on both sides). The result is a compact T-shaped construction. If a magnetic shield (partition) is provided between the magnetizing means and the carrier element or the sensors, the dimensions of the structural unit in the direction of the note transport direction can be minimized.
  • test device is specifically for banknote recognition, in combination e.g. suitable with optical test units.
  • other test objects with a geometric magnetic marking can also be examined.
  • Fig. 1 is a schematic representation of a module according to the invention in the
  • Fig. 2 is a schematic representation of the module in cross section.
  • Ways of Carrying Out the Invention 1 shows a top view of a module 1 according to the invention. It is arranged on a transport path 2, which runs here in the plane of the drawing and is symbolized by two lines. Its width is greater than the width B of the transport track 2.
  • the Hall sensors 6, 1. ..., 6, N of the second row 8 are placed in the spaces between the Hall sensors 5.1, ... 5.N of the first row 7.
  • the resolution (viewed transversely to the direction of transport 4) can thus be brought to several lines per centimeter.
  • the sensor arrangement described is preceded by a small magnetizing gap 9 which extends over the entire width of the module 1. It is formed between the two pole pieces 10, 1 1. It brings a saturating magnetic field into the transport path (and thus into the test object).
  • the magnetizing gap When the bank note 3 with its magnetic identifier 12 is guided past the module 1, the magnetizing gap first pre-magnetizes the identifier 12 (which is, for example, a number printed with magnetic ink). If the identifier 12 then passes the Hall sensors, these are activated. This means that the Hall sensors in the affected area signal a magnetic field. Through a clocked activation of the sensors, the bank note 3 can additionally generate a resolution in the transport direction and thus a magnetic pixel image. In principle, this can processed digitally like an optical image. For referencing the magnetic pixel image, the result of an optical position determination (derived with a module upstream in the transport direction) can be used if necessary.
  • the magnetic identifier wherever it is on the test object and what dimensions it has, can be detected with the device according to the invention.
  • the bandwidth of the amplifier should be adapted to the speed of the banknote and the desired spatial resolution.
  • a rod-shaped permanent magnet 14 is attached to the front of a carrier 13 (which can, for example, be an integral part of the module housing). (The longitudinal axis of the permanent magnet 14 is perpendicular to the plane of the drawing.) To the side of the permanent magnet 14 are the (magnetically conductive) pole pieces 10 and 11, which form a magnetizing gap 9 where they adjoin the transport path 2.
  • a shield 15 is provided laterally next to the pole shoe 11 in the carrier 13.
  • it is a partition made of a suitable material. It is perpendicular to the transport path 2 (front of the module) and is intended to keep the stray field of the magnetizing means mentioned away from the sensor part of the module 1. Depending on the strength of the stray field, the shield 15 can also be omitted.
  • the strength of the stray field acting on the sensor part can be influenced by varying the distance of the magnetizing gap 9 from the sensor part. An enlargement of this distance and thus a reduction in the stray field is achieved by a carrier 13 extended in the direction of the pole piece 10 or by attaching the permanent magnet 14 outside the carrier 13, for example in a separate module.
  • the sensor part is closed toward the transport path 2 by an epoxy resin plate 16, for example with a copper coating 17 (spring bronze) as a cover.
  • the coated side of the epoxy resin plate 16 and that in front of the side of the pole shoes 10, 11 form a continuous smooth plane, on which the bank note (driven by suitably arranged rollers) can slide.
  • a ceramic circuit board 19 is attached to the back of the epoxy resin plate 16. It carries the Hall sensors 5.1, 6.1 designed as chip elements.
  • the epoxy resin plate 16 is provided in the corresponding area with a recess 18 (e.g. milling).
  • the linear arrangement of the Hall sensors generates an analog voltage proportional to the magnetic field for each pixel.
  • the module 1 has a housing made of aluminum and is preferably provided with mounting elements or mechanical couplings, so that it can be installed in a banknote recognition machine with just a few hand movements.
  • the invention is not limited to the described embodiments. Basically, one or two rows of sensors are preferred, but in special circumstances more (e.g. three) rows can also be provided.
  • the sensor elements of the different rows should be placed offset to one another in order to achieve the greatest possible resolution.
  • FIG. 2 allows a compact design, but its type is not essential for the objective of the invention.

Landscapes

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

Abstract

L'invention concerne un dispositif pour détecter un objet à contrôler (3) pourvu d'un élément d'identification magnétique (12) et guidé sur une piste de transport (2). Ce dispositif se caractérise par le fait que le plus grand nombre possible de capteurs de champ magnétique (5.1, ..., 5.N; 6.1, ..., 6.N) sont montés dans une unité s'étendant sur toute la largeur de la piste de transport. En outre, des moyens de magnétisation s'étendent sur toute la largeur de la piste de transport. Les capteurs de champ magnétique sont des capteurs de Hall en forme de puces, qui sont disposés à intervalles réguliers sur au moins une ligne droite, de préférence deux lignes droites (7, 8), transversalement par rapport au sens de transport. Le dispositif présenté peut être en particulier utilisé pour des machines automatisées de reconnaissance de billets de banque.
EP00914004A 1999-05-06 2000-04-10 Dispositif pour detecter un element d'identification magnetique d'un objet a controler Withdrawn EP1181672A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00914004A EP1181672A1 (fr) 1999-05-06 2000-04-10 Dispositif pour detecter un element d'identification magnetique d'un objet a controler

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP99810393 1999-05-06
EP99810393A EP1050855A1 (fr) 1999-05-06 1999-05-06 Dispositif pour détecter un identificateur magnétique d'un objet à tester
EP00914004A EP1181672A1 (fr) 1999-05-06 2000-04-10 Dispositif pour detecter un element d'identification magnetique d'un objet a controler
PCT/CH2000/000206 WO2000068899A1 (fr) 1999-05-06 2000-04-10 Dispositif pour detecter un element d'identification magnetique d'un objet a controler

Publications (1)

Publication Number Publication Date
EP1181672A1 true EP1181672A1 (fr) 2002-02-27

Family

ID=8242812

Family Applications (2)

Application Number Title Priority Date Filing Date
EP99810393A Withdrawn EP1050855A1 (fr) 1999-05-06 1999-05-06 Dispositif pour détecter un identificateur magnétique d'un objet à tester
EP00914004A Withdrawn EP1181672A1 (fr) 1999-05-06 2000-04-10 Dispositif pour detecter un element d'identification magnetique d'un objet a controler

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP99810393A Withdrawn EP1050855A1 (fr) 1999-05-06 1999-05-06 Dispositif pour détecter un identificateur magnétique d'un objet à tester

Country Status (4)

Country Link
EP (2) EP1050855A1 (fr)
AU (1) AU3548300A (fr)
TW (1) TW446920B (fr)
WO (1) WO2000068899A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1294543C (zh) 2001-01-08 2007-01-10 德拉鲁国际公司 磁线读出器和磁线检测方法
FR2819610B1 (fr) * 2001-01-16 2003-08-08 Banque De France Procede de fabrication d'article securise
JP5348928B2 (ja) * 2008-04-16 2013-11-20 日本金銭機械株式会社 有価紙葉処理システム
DE102010007586A1 (de) * 2010-02-10 2011-08-11 NGZ Geldzählmaschinengesellschaft mbH & Co. KG, 15827 Sensor für Geldzählmaschinen
CN103942872B (zh) * 2014-04-18 2016-08-24 江苏多维科技有限公司 一种低飞移高度面内磁性图像识别传感器芯片
CN111016494B (zh) * 2019-11-20 2021-01-26 中钞特种防伪科技有限公司 防伪元件及防伪产品

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0057972B1 (fr) * 1981-01-12 1986-10-08 Kabushiki Kaisha Toshiba Appareil pour la détection d'un ruban métallique encastré dans du papier
GB2114795B (en) * 1981-12-21 1985-08-14 Omron Tateisi Electronics Co Verifying system
CH662194A5 (de) * 1984-02-14 1987-09-15 Sodeco Compteurs De Geneve Verfahren und einrichtung zum pruefen der echtheit von dokumenten.
SE458315B (sv) * 1987-06-12 1989-03-13 Inter Innovation Ab Anordning foer detektering av dokument
US5358088A (en) 1992-11-25 1994-10-25 Mars Incorporated Horizontal magnetoresistive head apparatus and method for detecting magnetic data
US5418458A (en) 1993-08-31 1995-05-23 Eastman Kodak Company Apparatus and method for authentication of documents printed with magnetic ink
EP0772046B1 (fr) 1995-10-30 2002-04-17 Sentron Ag Sonde de champs magnétique et sonde de courant ou d'énergie

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0068899A1 *

Also Published As

Publication number Publication date
EP1050855A1 (fr) 2000-11-08
TW446920B (en) 2001-07-21
WO2000068899A1 (fr) 2000-11-16
AU3548300A (en) 2000-11-21

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