EP0446638A1 - Bandes antivol pouvant être désactivées - Google Patents

Bandes antivol pouvant être désactivées Download PDF

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Publication number
EP0446638A1
EP0446638A1 EP91102050A EP91102050A EP0446638A1 EP 0446638 A1 EP0446638 A1 EP 0446638A1 EP 91102050 A EP91102050 A EP 91102050A EP 91102050 A EP91102050 A EP 91102050A EP 0446638 A1 EP0446638 A1 EP 0446638A1
Authority
EP
European Patent Office
Prior art keywords
magnetic component
deactivable
theft
hard
soft
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Withdrawn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
EP91102050A
Other languages
German (de)
English (en)
Inventor
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
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 EP0446638A1 publication Critical patent/EP0446638A1/fr
Withdrawn legal-status Critical Current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
    • 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

Definitions

  • the invention relates to a deactivatable theft protection strip, which is magnetized in the alternating field of an examination zone and thereby generates pulses with characteristic harmonics in a recording coil, consisting of an elongated composite body, which has a soft magnetic and a hard magnetic component and is manufactured so that the two Composite body-forming components are mechanically braced against each other.
  • the magnetically hard inner layer consists, for example, of an Fe-Co-V alloy, which can be surrounded on the outside by a second component made of soft steel, Cu, Ni, Al or brass.
  • a composite body which is particularly optimized for use in theft protection systems is described in DE-OS 38 24 075.
  • a composite body called a pulse wire consisting of a core and a shell made of two different magnetic materials is described.
  • the hard magnetic shell is magnetized in the activated state.
  • the impulse wire then arrives in the alternating field of an examination zone, the soft magnetic core is abruptly magnetized in every second half-wave of the alternating field.
  • the magnetized hard magnetic sheath reduces the demagnetization tendencies at the end of the pulse wire, so that on the one hand relatively short wires can be used but on the other hand the amplitude of the alternating field must be sufficient to overcome the premagnetization of the hard magnetic sheath.
  • the response field strength is therefore around 15 A / cm.
  • the object of the present invention is to provide an anti-theft security strip whose switching field strength is significantly lower and which can nevertheless be deactivated without the addition of permanent magnet materials.
  • the invention thus consists in that the hard magnetic component of the theft protection strip is demagnetized in the activated state and that in the examination zone the field strength of the alternating field is on the one hand above the coercive field strength of the soft magnetic component and on the other hand below the coercive field strength of the hard magnetic component.
  • the inner part of the composite body according to the invention can - as in the known - consist of a wire or a strip with a rectangular cross-section; the outer part then concentrically surrounds the core (usually the soft magnetic component) and is pulled with it and thus deformed into a unit. If the inner part of the anti-theft strip has a rectangular cross section, the outer part can be connected to the inner part by rolling the hard magnetic component on both sides and by annealing, preferably at more than 1000 ° C.
  • Figures 1 and 2 show the magnetization curves for a wire with a soft magnetic inner and hard magnetic outer component.
  • Figure 1 shows the induction in Tesla with small modulation, i. H. for fields from +400 mA / cm to -400 mA / cm. It can be seen from this curve that the coercive field strength is approximately 0.17 A / cm, so that fields as low as 0.2 A / cm lead to magnetic reversal of the soft magnetic part and can thus trigger an alarm in the examination zone.
  • the defined mechanical pretension of the soft magnetic component which can be set by the manufacturing parameters (choice of materials, annealing and tempering treatments), guarantees a defined Barkhausen effect during the remagnetization, so that voltage pulses also occur with a relatively slow field change (e.g. 50 Hz) of the alternating field steep slope and thus a large proportion of evaluable harmonics characteristic of the theft protection strip.
  • the hard magnetic component In the state of manufacture of the theft protection strip, the hard magnetic component is always demagnetized because of the annealing to be carried out during manufacture above the Curie temperature. If this should not be the case for any reason, demagnetization using an alternating field with decreasing amplitude would be required in order to set the active state of the theft protection strip. To deactivate it, it is sufficient to connect the theft protection strip to sufficiently strong magnets of alternating polarity.
  • the demagnetizing side effects are no longer prevented by magnetized permanent magnet material, it is necessary to provide a minimum length of the strip which is dependent on the cross section of the soft magnetic part.
  • the length in millimeters should be more than 4000 times the cross-section in square millimeters;
  • an anti-theft strip of at least 30 mm in length can be used if the diameter of the soft magnetic part is less than or equal to 0.1 mm.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
EP91102050A 1990-03-10 1991-02-14 Bandes antivol pouvant être désactivées Withdrawn EP0446638A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4007701 1990-03-10
DE4007701A DE4007701A1 (de) 1990-03-10 1990-03-10 Deaktivierbarer diebstahlsicherungsstreifen

Publications (1)

Publication Number Publication Date
EP0446638A1 true EP0446638A1 (fr) 1991-09-18

Family

ID=6401930

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91102050A Withdrawn EP0446638A1 (fr) 1990-03-10 1991-02-14 Bandes antivol pouvant être désactivées

Country Status (3)

Country Link
US (1) US5130698A (fr)
EP (1) EP0446638A1 (fr)
DE (1) DE4007701A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0643376A1 (fr) * 1993-09-10 1995-03-15 Knogo Corporation Marqueur de surveillance et procédé pour sa production
DE19740442A1 (de) * 1997-09-15 1999-03-18 Meto International Gmbh Deaktivierbares Sicherungselement für die elektronische Überwachung von Artikeln

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5313192A (en) * 1992-07-02 1994-05-17 Sensormatic Electronics Corp. Deactivatable/reactivatable magnetic marker having a step change in magnetic flux
JPH08186019A (ja) * 1994-11-02 1996-07-16 Unitika Ltd 磁気マーカ
JP3372117B2 (ja) * 1994-12-08 2003-01-27 ユニチカ株式会社 磁気マーカー及びその製造方法
US5602528A (en) * 1995-06-20 1997-02-11 Marian Rubber Products Company, Inc. Theft detection marker and method
US5729201A (en) * 1995-06-29 1998-03-17 International Business Machines Corporation Identification tags using amorphous wire
DE19604746A1 (de) * 1996-02-09 1997-08-14 Esselte Meto Int Gmbh Sicherungselement für die elektronische Artikelsicherung
US5729200A (en) * 1996-08-28 1998-03-17 Sensormatic Electronics Corporation Magnetomechanical electronic article surveilliance marker with bias element having abrupt deactivation/magnetization characteristic
DE19858064A1 (de) * 1998-12-16 2000-06-21 Meto International Gmbh Sicherungselement für die elektronische Artikelsicherung
GB2411794A (en) * 2004-03-05 2005-09-07 A C S Advanced Coding Systems A magnetic tag comprised of a soft magnetic unit and a hard magnetic unit having coercivity higher than 1000oe
JP2006260428A (ja) * 2005-03-18 2006-09-28 Fuji Xerox Co Ltd シート体、情報書込み方法、情報読取り方法及び読取り装置
CN111695724B (zh) * 2020-06-01 2023-05-05 浙江大学 一种基于混合神经网络模型的风速预测方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765007A (en) * 1969-07-11 1973-10-09 Minnesota Mining & Mfg Method and apparatus for detecting at a distance the status and identity of objects
US3820090A (en) * 1970-01-26 1974-06-25 Vlinsky M Bistable magnetic device
US4222517A (en) * 1978-09-18 1980-09-16 Samuel Cornelious Evans Magnetic marker
DE2933337A1 (de) * 1979-08-17 1981-03-26 Robert Bosch Gmbh, 70469 Stuttgart Geber zur erzeugung von elektrischen impulsen durch spruenge in der magnetischen polarisation sowie verfahren zur herstellung desselben
US4527152A (en) * 1979-09-14 1985-07-02 Shin International, Inc. Anti-shoplifting system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE152008C (fr) * 1903-04-02
DE933337C (de) * 1953-03-05 1955-09-22 Basf Ag Verfahren zur Herstellung von Alkoholen
JPS5843502A (ja) * 1981-09-09 1983-03-14 Aisin Seiki Co Ltd ウイ−ガンド効果素子
SE440002C (sv) * 1983-11-11 1987-07-13 Antonson Avery Ab Larmanordning for avkennande av inforandet av en med speciell markering forsedd detalj i ett for detta avkennande speciellt alstrat magnetfelt
US4660025A (en) * 1984-11-26 1987-04-21 Sensormatic Electronics Corporation Article surveillance magnetic marker having an hysteresis loop with large Barkhausen discontinuities
DE3824075A1 (de) * 1988-07-15 1990-01-18 Vacuumschmelze Gmbh Verbundkoerper zur erzeugung von spannungsimpulsen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765007A (en) * 1969-07-11 1973-10-09 Minnesota Mining & Mfg Method and apparatus for detecting at a distance the status and identity of objects
US3820090A (en) * 1970-01-26 1974-06-25 Vlinsky M Bistable magnetic device
US4222517A (en) * 1978-09-18 1980-09-16 Samuel Cornelious Evans Magnetic marker
DE2933337A1 (de) * 1979-08-17 1981-03-26 Robert Bosch Gmbh, 70469 Stuttgart Geber zur erzeugung von elektrischen impulsen durch spruenge in der magnetischen polarisation sowie verfahren zur herstellung desselben
US4527152A (en) * 1979-09-14 1985-07-02 Shin International, Inc. Anti-shoplifting system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0643376A1 (fr) * 1993-09-10 1995-03-15 Knogo Corporation Marqueur de surveillance et procédé pour sa production
DE19740442A1 (de) * 1997-09-15 1999-03-18 Meto International Gmbh Deaktivierbares Sicherungselement für die elektronische Überwachung von Artikeln

Also Published As

Publication number Publication date
US5130698A (en) 1992-07-14
DE4007701A1 (de) 1991-09-12

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