EP0762354B1 - Längsgestreckter Körper als Sicherungsetikett für elektromagnetische Diebstahlsicherungssysteme - Google Patents

Längsgestreckter Körper als Sicherungsetikett für elektromagnetische Diebstahlsicherungssysteme Download PDF

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Publication number
EP0762354B1
EP0762354B1 EP96113005A EP96113005A EP0762354B1 EP 0762354 B1 EP0762354 B1 EP 0762354B1 EP 96113005 A EP96113005 A EP 96113005A EP 96113005 A EP96113005 A EP 96113005A EP 0762354 B1 EP0762354 B1 EP 0762354B1
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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.)
Expired - Lifetime
Application number
EP96113005A
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German (de)
English (en)
French (fr)
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EP0762354A1 (de
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
Original Assignee
Vacuumschmelze GmbH and Co KG
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Publication date
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Publication of EP0762354A1 publication Critical patent/EP0762354A1/de
Application granted granted Critical
Publication of EP0762354B1 publication Critical patent/EP0762354B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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 SYSTEMS, e.g. PERSONAL 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 SYSTEMS, e.g. PERSONAL 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 of amorphous material, that with magnetic reversal in an interrogation zone with a magnetic alternating field due to Barkhausen jumps Reaching certain threshold values of the magnetic field suddenly magnetized and thereby in a query coil triggers characteristic voltage pulses.
  • DE-A 29 33 337 is already a ferromagnetic wire known that contains two strained against each other and that in an alternating field when exceeding or falling below sudden reversal of certain threshold values experienced through a Barkhaus jump. Under This wire can also be used as a security strip for alarm systems be used. Due to the Barkhausensprung there is a characteristic signal that for example by evaluating harmonics in one Interrogation coil can be recognized and with signals other magnetic parts cannot be confused.
  • this known ferromagnetic wire requires relatively high field strengths, for example to produce them in a query zone at the exit of a store relative high alternating fields are necessary. But here you are endeavors to apply fields as low as possible in order to to be able to make the query zone sufficiently wide and on the other hand, health risks for the query zone keep people passing through as low as possible.
  • Strips for anti-theft or identification systems can be used and with low amplitude an interrogating alternating field.
  • the hard magnetic Component of this composite body with impulse behavior can be used to deactivate the theft deterrent strip by magnetization and thus Saturation of the soft magnetic part.
  • the Deactivated strips can then be triggered without an alarm are transported through the query zone.
  • the present invention now solves the problem Strips for anti-theft or identification systems to provide that with low panel strengths a defined impulse behavior sudden magnetic reversal due to cracks in Barkhausen has and is inexpensive to produce and also at relative short stripes a sufficiently high, characteristic Signal generated.
  • the solution is to use a strip made of an amorphous material with a cobalt content of there is at least 20 at% and its property to pulsed magnetic reversal through heat treatment for setting the magnetic anisotropy when current is flowing Receives strips, and that the current through the Stripes related to the temperature and duration of treatment the heat treatment is adjusted so that there is a ratio of remanence induction to saturation induction between 0.2 and 0.9 results.
  • a heat-treated according to the invention amorphous strip made of an alloy Cobalt base, especially if certain values are observed from remanence induction to saturation induction in particular high pulse voltages in the interrogation coil that triggers through the periodic magnetic reversal of the strip and the resulting jumps in the Barkhaus.
  • the use of such amorphous stripes relatively short anti-theft stripes (less than 50 mm) and still high enough Impulse voltages result, which in turn are characteristic Trigger evaluable harmonics in the interrogation coil.
  • the behavior of the invention can be improved Stripes if you take the stripe not just from the amorphous Produces tape, but the stripe from this amorphous Tape and an associated soft magnetic material, that magnetizes continuously, exists.
  • one can with the invention Streak through an associated permanent magnet also achieve that an asymmetrical signal, a sudden magnetic reversal with different ones Threshold values of the magnetic field, depending on the direction of magnetization, is triggered. This is for pulse wires explained in more detail in EP-B 156 016.
  • alloys of the composition in at.% Are: 1) Co 74.5 Fe 1.5 Mn 4 Si 11 B 9 and 2) Co 72 Fe 1.1 Mo 1 Mn 4.2 Si 13.2 B 8.5 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 remanence induction Jr to the saturation induction Js was measured on 150 mm long strips in order to exclude the influence of the demagnetizing effect.
  • FIG. 1 shows an example of a heat treatment according to provided the invention.
  • a supply spool 1 with the Amorphous tape is fed through a tensor roller 2 a first pair of rollers 3, which with a line 4 a power source 5 is connected.
  • the amorphous band 6 After going through the the first pair of rollers, the amorphous band 6 enters one Oven 7, in which it is electrically shielded by a shielding tube 8 is surrounded by conductive or magnetically soft material in order keep external field influences away.
  • a coil 9 which is connected to a voltage source 10 and a generated on the amorphous band 6 longitudinal field.
  • the serve first pair of rollers 3 and a second pair of rollers 11 not only the supply of the current from the current source 5, but can also do so by using the appropriate drive used a certain tension in the adjust amorphous band 6.
  • a shield against external ones To omit fields completely or partially and for example to use the existing earth field as a longitudinal field. At certain materials, it may also be sufficient if only the circular during the heat treatment, through which Current flow generated field acts on the tape or the wire from which the strips are then made. In particular for alloys with positive magnetostriction the effect caused by the longitudinal field also by a Tension of the belt during the heat treatment produce. Of course you can also do one at the same time Use longitudinal field and tension.
  • an amorphous band are for identification purposes tapes reacting differently from goods or Arrange wires in a strip or there are several To connect strips with the identified goods.
  • the shape of the magnetization curve for example by the remanence ratio, defined by the quotient from remanent induction Jr to saturation induction Js (each measured in Tesla). It has surprisingly found that neither flat Grind rectangular loops with accordingly higher remanence ratio for the pulse formation in this Application are advantageous.
  • the optimum of Impulse height to a small extent also from that used Material and dimensions of the strip depends on the parameters for heat treatment (longitudinal field, current by the belt and belt tension) so that a remanence ratio between 0.2 and 0.9, preferably between 0.3 and 0.7.
  • the peak voltage of the pulse at the amorphous band according to the invention at a higher field strength occurs, but a much higher one Voltage pulse and a steep edge when the Tension results.
  • the measurements show that the voltage pulse in the amorphous band according to the invention about 120 mV is a maximum while with the amorphous wire Voltage amplitude of 30 mV was achievable.
  • 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 so that the lowest possible magnetostriction, preferably less than ⁇ 4 x 10 -6 results.
  • 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 not only allow the response field strength to be reduced change depending on the magnetic reversal direction, but it is - as with known soft magnetic Stripes - also possible due to a slightly stronger one Permanent magnets to saturate the strip and so the impulse behavior turn off. This can be a deactivable Security strips can be obtained.
  • Advantageous dimensions for the amorphous tape that in the strips according to the invention either alone or together is included with other materials a length up to 100 mm if a width up to 5 mm and a thickness of max. 50 ⁇ m for the tape or the diameter of the wire is provided. But they are also shorter Stripes possible with sufficient pulse height.
  • the advantageous dimensions are up to a length 60 mm in that you have a width up to 3 mm and a Tape thickness up to 40 ⁇ m is used.
  • Strips with lengths can also be made with these dimensions Manufacture under 40 mm.
  • the Signal level can be increased by using tempered bands for short stripe lengths, that is for stripe lengths between 20 and 40mm, at the ends of longitudinal strips from one soft magnetic material can be arranged. This will an increase in the signal level up to a factor of 10 is achieved. In the case of untempered bands, the signal level becomes approximately that Increased 1 to 2 times.
  • the distance between the strips should not be less than 10mm.
  • the maximum pulse height, that is the optimal one The position depends on the length of the strip amorphous band and the dimensions of the soft magnetic Strips off.
  • a good direct contact between the amorphous bands and the soft magnetic stripe is essential, with a External pressure with an adhesive strip is sufficient.
  • a significant signal boost is also achieved by two soft magnetic strips on each Ends of the amorphous band arranged above and below become.

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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 Längsgestreckter Körper als Sicherungsetikett für elektromagnetische Diebstahlsicherungssysteme Expired - Lifetime EP0762354B1 (de)

Applications Claiming Priority (2)

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

Publications (2)

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

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Family Applications (1)

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EP96113005A Expired - Lifetime EP0762354B1 (de) 1995-09-09 1996-08-13 Längsgestreckter Körper als Sicherungsetikett für elektromagnetische Diebstahlsicherungssysteme

Country Status (6)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107949261A (zh) * 2017-11-15 2018-04-20 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

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DE19653428C1 (de) * 1996-12-20 1998-03-26 Vacuumschmelze Gmbh Verfahren zum Herstellen von Bandkernbändern sowie induktives Bauelement mit Bandkern
US7979173B2 (en) * 1997-10-22 2011-07-12 Intelligent Technologies International, Inc. Autonomous vehicle travel control systems and methods
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DE19918589A1 (de) * 1999-04-23 2000-10-26 Vacuumschmelze Gmbh Magnetischer Markierstreifen und Verfahren zur Herstellung eines magnetischen Markierstreifens
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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 (en) * 2005-04-26 2016-02-24 Amotech Co., Ltd. Magnetic sheet for radio frequency identification antenna, method of manufacturing the same.
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CN102066889B (zh) * 2008-04-18 2014-07-02 梅特格拉斯公司 远程温度感测装置及相关的远程温度感测方法
WO2009128803A1 (en) * 2008-04-18 2009-10-22 Metglas, Inc. Temperature sensor and related remote temperature sensing method
CN104882239B (zh) * 2015-06-03 2017-12-05 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
CN108072777A (zh) * 2016-11-15 2018-05-25 刘伟华 防窃电装置
US12426132B2 (en) * 2018-06-12 2025-09-23 Carnegie Mellon University Thermal processing techniques for metallic materials
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
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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Also Published As

Publication number Publication date
DK0762354T3 (da) 2001-02-05
JPH09148117A (ja) 1997-06-06
DE19533362A1 (de) 1997-03-13
US5757272A (en) 1998-05-26
EP0762354A1 (de) 1997-03-12
ES2152463T3 (es) 2001-02-01
DE59606138D1 (de) 2000-12-21

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