EP0762354A1 - Corps allongés comme étiquette de sécurité pour des systèmes électromagnétiques antivol - Google Patents

Corps allongés comme étiquette de sécurité pour des systèmes électromagnétiques antivol Download PDF

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Publication number
EP0762354A1
EP0762354A1 EP96113005A EP96113005A EP0762354A1 EP 0762354 A1 EP0762354 A1 EP 0762354A1 EP 96113005 A EP96113005 A EP 96113005A EP 96113005 A EP96113005 A EP 96113005A EP 0762354 A1 EP0762354 A1 EP 0762354A1
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EP
European Patent Office
Prior art keywords
strip
elongated body
body according
amorphous
magnetic
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.)
Granted
Application number
EP96113005A
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German (de)
English (en)
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EP0762354B1 (fr
Inventor
Giselher Dr. Herzer
Gerd Rauscher
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.)
Vacuumschmelze GmbH and Co KG
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Vacuumschmelze GmbH and Co KG
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 Vacuumschmelze GmbH and Co KG filed Critical Vacuumschmelze GmbH and Co KG
Publication of EP0762354A1 publication Critical patent/EP0762354A1/fr
Application granted granted Critical
Publication of EP0762354B1 publication Critical patent/EP0762354B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
    • G08B13/2408—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using ferromagnetic tags
    • G08B13/2411—Tag deactivation
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2428—Tag details
    • G08B13/2437—Tag layered structure, processes for making layered tags
    • G08B13/244—Tag manufacturing, e.g. continuous manufacturing processes
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2428—Tag details
    • G08B13/2437—Tag layered structure, processes for making layered tags
    • G08B13/2442—Tag materials and material properties thereof, e.g. magnetic material details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15333—Amorphous metallic alloys, e.g. glassy metals containing nanocrystallites, e.g. obtained by annealing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15391—Elongated structures, e.g. wires

Definitions

  • the invention relates to an elongated body for electromagnetic anti-theft or identification systems with a strip made of amorphous material, which is magnetized in a removal zone with an alternating magnetic field by Barkhausen jumps when magnetization is reversed when certain threshold values of the magnetic field are reached and thereby triggers characteristic voltage pulses in an interrogation coil.
  • a ferromagnetic wire is already known from DE-A 29 33 337, which contains two layers braced against one another and which experiences a sudden change in magnetism due to a Barkhausen jump in an alternating field when certain threshold values are exceeded or undershot.
  • this wire can be used as a security strip for alarm systems.
  • the Barkhausensprung results in a characteristic signal that can be recognized, for example, by evaluating harmonics in a query coil and that cannot be confused with signals from other magnetic parts.
  • this known ferromagnetic wire requires relatively high field strengths, for whose generation relatively high alternating fields are necessary, for example, in an interrogation zone at the exit of a shop.
  • efforts are made to use the lowest possible fields, on the one hand to be able to make the query zone sufficiently wide and on the other hand to keep health risks for people passing through the query zone as low as possible.
  • a composite body By using certain soft and hard magnetic materials that are braced against each other, a composite body has become known from DE-C-38 24 075, which can be used as a strip for theft protection or identification systems and manages with a low amplitude of an interrogating alternating field.
  • the hard magnetic component of this composite body with impulse behavior can be used to deactivate the theft protection strip by magnetizing and thus saturating the soft magnetic part. The deactivated strip can then be transported through the interrogation zone without triggering an alarm.
  • a strip for anti-theft systems should also be suitable for low-priced goods, it is necessary to provide a strip that is as simple as possible and is therefore relatively cheap.
  • a strip has become known, for example, from US 4,298,268. It is proposed here to provide a strip of amorphous material, since the amorphous material has an extraordinarily high permeability and there is therefore also only a low risk of confusion with other soft magnetic objects.
  • the amorphous strips were heat-treated in a longitudinal field to increase the permeability.
  • a very steep magnetic reversal curve is achieved (induction depending on the field strength), but not the particularly steep impulses that can be achieved with a pulse wire that is suddenly magnetized by Barkhausen jumps and regardless of the rate of field change.
  • the present invention solves the problem of providing a strip for anti-theft or identification systems that manages with low switching field strengths, has a defined impulse behavior due to sudden magnetic reversal as a result of jumps in Barkhausen and is inexpensive to produce and also generates a sufficiently high, characteristic signal even with relatively short strips .
  • a strip which consists of an amorphous material with a cobalt content of at least 20 at% and receives its property for pulsed magnetic reversal through a heat treatment to adjust the magnetic anisotropy in the case of current-carrying strips, and that Current through the strip in connection with the temperature and the duration of the heat treatment is adjusted so that there is a ratio of remanent induction to saturation induction between 0.2 and 0.9.
  • an amorphous strip made of an alloy based on cobalt and which has been heat-treated according to the invention especially when adhering to certain values of remanent induction for saturation induction, triggers particularly high pulse voltages in the interrogation coil, which are triggered due to the periodic magnetic reversal of the strip and the Barkhausen jumps triggered with it.
  • the use of such amorphous strips allows relatively short theft protection strips (less than 50 mm) and nevertheless results in sufficiently high pulse voltages, which in turn trigger characteristic evaluable harmonics in the interrogation coil.
  • the behavior of the strip according to the invention can be improved if the strip is not only produced from the amorphous band, but the strip consists of this amorphous band and an associated soft-magnetic material which is continuously magnetized.
  • the amorphous strip according to the invention has a much smaller coercive field strength. It has been found that a particularly effective increase in the pulse height can be achieved if a soft magnetic material is provided whose coercive field strength is below 30 mA / cm and if the cross section multiplied by the saturation induction is higher than the remanent flow of the strip with pulse behavior. This can be achieved if one uses an amorphous or nanocrystalline alloy and provides a sufficient cross section for the soft magnetic strip. It is particularly advantageous if the length of the soft magnetic strip is chosen to be greater than that of the strip with impulse behavior.
  • a permanent magnet connected to the strip according to the invention can also be used to achieve an asymmetrical signal, that is to say a sudden magnetic reversal in the case of different ones Threshold values of the magnetic field, depending on the direction of magnetization, is triggered. This is explained in more detail for pulse wires in EP-B 156 016.
  • the material for the strip consists of an alloy which satisfies the formula Co a Ni b (Fe, Mn) c (Si, B, X) d , where in at%:
  • alloys of the composition in at.% Are: suitable for use as anti-theft strips according to the invention.
  • an amorphous band from the alloy composition mentioned under 1) has been used.
  • the ratio of the remanent induction Jr to the saturation induction Js was measured on 150 mm long strips in order to exclude the influence of the demagnetizing effect.
  • an amorphous tape (or also a wire) is first produced as usual by rapid quenching from the melt.
  • FIG. 1 An example of a heat treatment according to the invention is provided in FIG. 1.
  • a supply reel 1 with the amorphous ribbon arrives via a tensor roller 2 to a first pair of rollers 3, which is connected to a power source 5 via a line 4.
  • the amorphous band 6 After passing through the first pair of rollers, the amorphous band 6 enters an oven 7, in which it is surrounded by a shielding tube 8 made of electrically conductive or magnetically soft material, in order to keep external field influences away.
  • a shielding tube 8 made of electrically conductive or magnetically soft material
  • the first pair of rollers 3 and a second pair of rollers 11 not only serve to supply the current from the current source 5, but can also be used by appropriate drive to set a certain tension in the amorphous band 6.
  • the current supplied from the current source 5 to the amorphous band 6 can also be used to heat the band 6, but primarily serves to generate a magnetic part which surrounds the amorphous band inside.
  • the tape now has the properties required for use as strips for anti-theft and identification systems, so that the strips according to the invention are cut from them can be produced.
  • amorphous tape is sufficient for use in anti-theft systems, tapes or wires with different reactions have to be arranged in a strip for the purpose of identifying goods, or several strips have to be connected to the identified goods.
  • the shape of the magnetization curve which is defined, for example, by the remanence ratio, defined by the quotient from the remanence induction Jr to the saturation induction Js (each measured in Tesla) is essential for the pulse height when using the amorphous wire with a Barkhausensprung effect for strips of theft protection or identification systems. , can be described. It has surprisingly been found that neither flat loops nor rectangular loops with a correspondingly higher remanence ratio are advantageous for the pulse formation in this application.
  • the parameters (longitudinal field, current through the strip and strip tension) must be set during the heat treatment so that a remanence ratio between 0.2 and 0 , 9, preferably between 0.3 and 0.7.
  • various heat treatments were carried out, which resulted in different remanence ratios.
  • the ratio of maximum transverse field to longitudinal field in the range from 1 to 10 must be observed during the heat treatment.
  • Fig. 5 for comparison of the strip according to the invention with a strip whose pulse behavior is determined by internal stresses (US 4,660,025), the pulse voltage U and the field strength H are plotted over time t in seconds if the field strength H is corresponding Curve H1 continuously increased.
  • Curve U1 shows the tension that results when using an amorphous wire that has a length of 90 mm and a diameter of 0.13 mm, compared to the voltage curve corresponding to curve U2 when using an amorphous tape according to the invention with the Dimensions: width: 2 mm, thickness: 23 ⁇ m and the same length of 90 mm.
  • the peak voltage of the pulse occurs in the amorphous band according to the invention at a higher field strength, but there is a substantially higher voltage pulse and a steep edge when the voltage rises.
  • the measurements show that the voltage pulse in the amorphous band according to the invention is approximately 120 mV, while a maximum voltage amplitude of 30 mV could be achieved with the amorphous wire.
  • Particularly advantageous alloys for the intended application result when a cobalt content between 60 and 85 at .-% is provided and when the iron / manganese content, which determines the magnetostriction constant, is in the range from 1 to 10 at .-% is chosen that a magnetostriction as low as possible, preferably below ⁇ 4 x 10 -6 .
  • X denotes either one or more of the transition metals of groups IIIB-VIB such as. B. Nd, Mo, Ta, W, V etc. and / or one or more elements of the main groups IIIA-VA, such as. B. C, P, Ge.
  • Permanent magnets can not only change the response field strength depending on the magnetic reversal direction, but - as with known soft magnetic strips - it is also possible to saturate the strips with a slightly stronger permanent magnet and thus switch off the pulse behavior. In this way, a deactivatable security strip can be obtained.
  • Advantageous dimensions for the amorphous tape which is contained in the strip according to the invention either alone or together with other materials, result in a length of up to 100 mm if a width of up to 5 mm and a thickness of max. 50 microns for the tape or the diameter of the wire is provided.
  • shorter strips are also possible with a sufficient pulse height.
  • the advantageous dimensions with a length of up to 60 mm are that a width of up to 3 mm and a strip thickness of up to 40 ⁇ m are used.
  • strips with lengths of less than 40 mm can also be produced.
  • the shorter the stripe the higher the switching field strength.
  • a wire is used instead of a band, this can be reduced after the production by rapid solidification by mechanical deformation in cross section and also changed by z.
  • the signal level can be increased by arranging longitudinal strips made of a soft magnetic material at the ends of short tempered strips, ie for strip lengths between 20 and 40 mm. This increases the signal level by a factor of 10. In the case of unannealed bands, the signal level is increased by approximately 1 to 2 times.
  • the distance between the strips should not be less than 10mm.
  • the maximum pulse height that is to say the optimal position, depends in particular on the strip length of the amorphous strip and the dimensions of the soft magnetic strips.
  • a significant signal increase is also achieved by arranging two soft magnetic strips at the respective ends of the amorphous band above and below.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • General Physics & Mathematics (AREA)
  • Dispersion Chemistry (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Burglar Alarm Systems (AREA)
  • Soft Magnetic Materials (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
EP96113005A 1995-09-09 1996-08-13 Corps allongés comme étiquette de sécurité pour des systèmes électromagnétiques antivol Expired - Lifetime EP0762354B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19533362 1995-09-09
DE19533362A DE19533362A1 (de) 1995-09-09 1995-09-09 Längsgestreckter Körper als Sicherungsetikett für elektromagnetische Diebstahlsicherungssysteme

Publications (2)

Publication Number Publication Date
EP0762354A1 true EP0762354A1 (fr) 1997-03-12
EP0762354B1 EP0762354B1 (fr) 2000-11-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96113005A Expired - Lifetime EP0762354B1 (fr) 1995-09-09 1996-08-13 Corps allongés comme étiquette de sécurité pour des systèmes électromagnétiques antivol

Country Status (6)

Country Link
US (1) US5757272A (fr)
EP (1) EP0762354B1 (fr)
JP (1) JPH09148117A (fr)
DE (2) DE19533362A1 (fr)
DK (1) DK0762354T3 (fr)
ES (1) ES2152463T3 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0949598A2 (fr) * 1998-04-08 1999-10-13 Meto International GmbH Elément antivol électronique
US7979173B2 (en) * 1997-10-22 2011-07-12 Intelligent Technologies International, Inc. Autonomous vehicle travel control systems and methods
EP2021752A4 (fr) * 2006-05-09 2015-03-18 Thermal Solutions Inc Détecteurs de température à élements magnétiques
CN104882239A (zh) * 2015-06-03 2015-09-02 山东大学 一种使Fe78Si9B13非晶饱和磁化强度提高和矫顽力降低的方法
CN112008053A (zh) * 2020-08-27 2020-12-01 燕山大学 一种合金的制备装置及电流施加方法

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CA2216897A1 (fr) * 1996-09-30 1998-03-30 Unitika Ltd. Ruban en alliage amorphe du groupe fe et marqueur magnetique
DE19653428C1 (de) * 1996-12-20 1998-03-26 Vacuumschmelze Gmbh Verfahren zum Herstellen von Bandkernbändern sowie induktives Bauelement mit Bandkern
US6254695B1 (en) * 1998-08-13 2001-07-03 Vacuumschmelze Gmbh Method employing tension control and lower-cost alloy composition annealing amorphous alloys with shorter annealing time
DE19918589A1 (de) * 1999-04-23 2000-10-26 Vacuumschmelze Gmbh Magnetischer Markierstreifen und Verfahren zur Herstellung eines magnetischen Markierstreifens
JP4128721B2 (ja) * 2000-03-17 2008-07-30 株式会社東芝 情報記録物品
GB2374084A (en) * 2001-04-03 2002-10-09 Fourwinds Group Inc Alloys having bistable magnetic behaviour
US6830634B2 (en) * 2002-06-11 2004-12-14 Sensormatic Electronics Corporation Method and device for continuous annealing metallic ribbons with improved process efficiency
ES2238913B1 (es) * 2003-10-09 2006-11-01 Micromag 2000, S.L. Microhilo amorfo y metodo para su fabricacion.
EP1724708B1 (fr) * 2005-04-26 2016-02-24 Amotech Co., Ltd. Feuille magnétique pour RFID et sa méthode de fabrication
US7771545B2 (en) * 2007-04-12 2010-08-10 General Electric Company Amorphous metal alloy having high tensile strength and electrical resistivity
KR101419263B1 (ko) * 2008-04-18 2014-07-16 메트글라스, 인코포레이티드 원격 온도 센싱 장치와 그에 따른 원격 온도 센싱 방법
EP2269017A4 (fr) * 2008-04-18 2013-09-25 Metglas Inc Détecteur de température et procédé de détection de température à distance apparenté
CN108072777A (zh) * 2016-11-15 2018-05-25 刘伟华 防窃电装置
CN107949261B (zh) * 2017-11-15 2020-03-03 中国科学院宁波材料技术与工程研究所 一种电磁波吸收材料及其制备方法
US20200029396A1 (en) * 2018-06-12 2020-01-23 Carnegie Mellon University Thermal processing techniques for metallic materials
CN116313357B (zh) * 2023-05-11 2023-07-28 广汽埃安新能源汽车股份有限公司 一种非晶纳米晶软磁合金、制备方法及应用

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7979173B2 (en) * 1997-10-22 2011-07-12 Intelligent Technologies International, Inc. Autonomous vehicle travel control systems and methods
EP0949598A2 (fr) * 1998-04-08 1999-10-13 Meto International GmbH Elément antivol électronique
DE19815583A1 (de) * 1998-04-08 1999-10-14 Meto International Gmbh Element für die elektronische Artikelsicherung oder für die Sensortechnik
EP0949598A3 (fr) * 1998-04-08 2000-11-22 Meto International GmbH Elément antivol électronique
US6259368B1 (en) 1998-04-08 2001-07-10 Meto International Gmbh Element for securing articles electronically or for sensor technology
EP2021752A4 (fr) * 2006-05-09 2015-03-18 Thermal Solutions Inc Détecteurs de température à élements magnétiques
CN104882239A (zh) * 2015-06-03 2015-09-02 山东大学 一种使Fe78Si9B13非晶饱和磁化强度提高和矫顽力降低的方法
CN112008053A (zh) * 2020-08-27 2020-12-01 燕山大学 一种合金的制备装置及电流施加方法
CN112008053B (zh) * 2020-08-27 2021-09-17 燕山大学 一种合金的制备装置及电流施加方法

Also Published As

Publication number Publication date
ES2152463T3 (es) 2001-02-01
DE19533362A1 (de) 1997-03-13
US5757272A (en) 1998-05-26
DE59606138D1 (de) 2000-12-21
JPH09148117A (ja) 1997-06-06
EP0762354B1 (fr) 2000-11-15
DK0762354T3 (da) 2001-02-05

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