EP0789340A1 - Elément de sécurité pour la surveillance électronique d'articles - Google Patents

Elément de sécurité pour la surveillance électronique d'articles Download PDF

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Publication number
EP0789340A1
EP0789340A1 EP97100501A EP97100501A EP0789340A1 EP 0789340 A1 EP0789340 A1 EP 0789340A1 EP 97100501 A EP97100501 A EP 97100501A EP 97100501 A EP97100501 A EP 97100501A EP 0789340 A1 EP0789340 A1 EP 0789340A1
Authority
EP
European Patent Office
Prior art keywords
magnetic material
hard
securing element
barkhausen effect
semi
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
EP97100501A
Other languages
German (de)
English (en)
Other versions
EP0789340B1 (fr
Inventor
Manfred Dr. Rührig
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.)
Meto International GmbH
Original Assignee
Esselte Meto International GmbH
Meto International 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 Esselte Meto International GmbH, Meto International GmbH filed Critical Esselte Meto International GmbH
Publication of EP0789340A1 publication Critical patent/EP0789340A1/fr
Application granted granted Critical
Publication of EP0789340B1 publication Critical patent/EP0789340B1/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
    • 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 security element for electronic article security, consisting of a material of high permeability and low coercive force (soft magnetic material) which, when an external magnetic alternating field is applied in a query zone, emits a characteristic signal which can be detected by means of a detector device.
  • a security element for electronic article security consisting of a material of high permeability and low coercive force (soft magnetic material) which, when an external magnetic alternating field is applied in a query zone, emits a characteristic signal which can be detected by means of a detector device.
  • the characteristic signal therefore occurs periodically with the frequency of the low-frequency field.
  • harmonic detection system it has also become known to use only a query field in the kHz range for excitation of the fuse element, the characteristic signal of the fuse element again in the cycle of a low-frequency field, which points the soft magnetic material between the two saturations - and drives, occurs.
  • the shape of the characteristic signal is then compared with a predetermined signal shape. If the two agree, this is interpreted as an illegal stay of a secured article in the query zone; an alarm indicates the theft to the operating personnel.
  • the hysteresis curves of securing elements which are made of a soft magnetic material have an essentially linear course between the two saturation states.
  • securing elements have also become known whose hysteresis curves show a sudden transition between the two saturation states as soon as they are forced to change their direction of saturation by an external magnetic field.
  • Materials with a discontinuous transition behavior between the two saturation states are referred to as "materials with a high Barkhausen effect”.
  • materials with a high Barkhausen effect Materials with a discontinuous transition behavior between the two saturation states.
  • the properties of these materials and the physical principles of the Barkhausen effect are described in detail in US Pat. No. 4,660,025 or also in EP 0 448 114 A1.
  • the cited prior art documents refer to how physical special treatment of soft magnetic material can convert it into a material with a high Barkhausen effect.
  • the Barkhausen effect can be intensified if a soft magnetic material is arranged in the vicinity of the material with the Barkhausen effect in such a way that the stray fields of the two materials couple.
  • the signal of a correspondingly prepared security element is so strong that it is reliably detected in the interrogation zone of a detection system with relatively small dimensions of the materials used.
  • Fuse elements of the type described above are characterized by a characteristic signal which blatantly deviates from the signal form recognizable in a harmonic detection system.
  • the consequence of this is that an article which carries a soft magnetic material and a material with a high Barkhausen effect as a securing element is not recognized as a secured article in a harmonic detection system. Since no alarm is subsequently triggered, the article can pass through the query zone unhindered despite electronic security.
  • the invention has for its object to modify a security element, which is composed of a soft magnetic material and a material with a high Barkhausen effect, in such a way that it is recognized by a harmonic detection system.
  • the object is achieved in that, in addition to the soft magnetic material and the material with a high Barkhausen effect - the material with the high Barkhausen effect with respect to the soft magnetic material being arranged in such a way that both are coupled via their stray fields - a semi-hard or hard magnetic material is provided which pre-magnetizes the material with the high Barkhausen effect.
  • the characteristic signal of the material with the high Barkhausen effect is suppressed by the solution according to the invention.
  • An article provided with a security element according to the invention can therefore be detected in the monitoring zone of a harmonic detection system.
  • the effect can be reversed by appropriate demagnetization of the semi-hard or hard magnetic material, ie the security elements according to the invention can be used both for harmonic detection systems and for detection systems for security elements with a Barkhausen effect.
  • the soft magnetic material and / or the material with the high Barkhausen effect is a thin-layer material.
  • Securing elements made of thin-layer materials have already become known from EP 0 295 028 B1.
  • the soft magnetic material and / or the material with the high Barkhausen effect is / are strip-shaped or consists of a drawn wire.
  • a thin-layer material can also be used for the semi-hard or hard magnetic material.
  • An alternative embodiment proposes a perforated foil, preferably a Ni perforated foil - or a ferrite layer.
  • the semi-hard or hard magnetic material is arranged in individual sections.
  • the sections are positioned as a quasi third layer on the material with the high Barkhausen effect, since this achieves an optimal interaction of the stray field of the semi-hard or hard magnetic material with the stray field of the material with the high Barkhausen effect. while the influence of the stray field of the soft magnetic material is relatively small.
  • 'individual sections' can also mean that the semi-hard or hard magnetic material in selected areas has a low permeability in the direction of the preferred axis of the securing element.
  • the semi-hard or hard magnetic material has a desired bias in one direction.
  • this is expressed in such a way that the portion of the signal resulting from the material with the Barkhausen effect disappears; the signal itself is shifted in the direction of the positive or the negative time axis by the premagnetization when excited by an alternating magnetic field.
  • the semi-hard or hard magnetic material In order to prevent this time shift in the occurrence of the characteristic signal, it has proven to be particularly expedient for the semi-hard or hard magnetic material to have selected sections which are premagnetized in opposite directions, preferably two sections with opposite magnetization lying next to one another. This makes it possible to compensate for temporal shifts, such as occur in one direction in the case of the configuration with a premagnetization.
  • the detection system should subsequently of course no longer trigger an alarm.
  • the semi-hard or hard magnetic material is selected such that, in the saturated state, it prevents the characteristic signal of the soft magnetic material and the material with the high Barkhausen effect in the question zone.
  • the deactivator material must be exposed to a magnetic field so strong that it is driven into saturation. As a result of the deactivation, the characteristic signal is moved out of the time range under consideration and can subsequently no longer be registered by the detection system.
  • FIG. 2a shows the hysteresis curve 3 which results when the stray fields 7 of the two materials 1, 2 couple with one another.
  • the four boxes with the arrows each indicate the direction of magnetization of the soft magnetic material 1 and the material with the high Barkhausen effect 2.
  • both the soft magnetic material 1 and the material with the high Barkhausen effect 2 are magnetized in one direction.
  • the soft magnetic material 1 first changes its magnetization direction.
  • the stray field 7 of the soft magnetic material 1 interacting with the stray field 7 of the material with the high Barkhausen effect 2 delays the sudden magnetic reversal of the material with the high Barkhausen effect 2: the hysteresis curve 3 is partly linear, partly it shows a sudden change.
  • the resulting characteristic signal 4 has the shape shown in FIG. 2b.
  • This characteristic signal 4 differs from the characteristic signal 4, which is emitted by a soft magnetic material 1 in response to an interrogation field (see FIG. 3c), by an asymmetrical double peak.
  • This form of the characteristic signal 4 is not recognized in a harmonic detection system as originating from an electronically secured article.
  • FIG. 3a A first embodiment of the securing element 8 according to the invention can be seen in FIG. 3a.
  • the securing element 8 consists of a soft magnetic material 1, a material arranged above it with a high Barkhausen effect 2 and of individual sections of a semi-hard or hard magnetic material 6.
  • the sections of the semi-hard or hard magnetic material 6 are pre-magnetized in such a way that, in particular, the spatially closer one Stray field 7 of the material with the high Barkhausen effect 2 is affected.
  • the interaction with the stray field 7 of the semi-hard or hard magnetic material 6 is such that the material with the high Barkhausen effect 2 does not make any signal contributions in the magnetic alternating field of the query zone.
  • the hysteresis curve 3 of the embodiment of the securing element 8 according to the invention shown in FIG. 3a essentially corresponds - as can be seen from FIG. 3b - to the hysteresis curve 3 of a soft magnetic material 1.
  • the hysteresis curve 3 is an amount Hb in the direction of the positive H axis postponed.
  • the characteristic signal 4 now shows the desired shape, which can be easily achieved by a harmonic detection system is detected and evaluated as belonging to a secured article.
  • the characteristic signal 4 like the associated hysteresis curve 3, shows a shift in the direction of the time axis hzw. in the direction of the H axis. However, nothing changes in the relative spacing of the peaks 5 of the characteristic signal 4.
  • the above-described displacement effect can be avoided if, as can be seen in FIG. 4a, the semi-hard or hard magnetic material 6 of the securing element 8 is premagnetized in both directions by the same amount.
  • FIG. 4b shows the resulting hysteresis curve 3 of the securing element according to the invention, which is symmetrical to the coordinate origin and which is recorded in FIG. 4a.

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)
EP97100501A 1996-02-09 1997-01-15 Elément de sécurité pour la surveillance électronique d'articles Expired - Lifetime EP0789340B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19604746A DE19604746A1 (de) 1996-02-09 1996-02-09 Sicherungselement für die elektronische Artikelsicherung
DE19604746 1996-02-09

Publications (2)

Publication Number Publication Date
EP0789340A1 true EP0789340A1 (fr) 1997-08-13
EP0789340B1 EP0789340B1 (fr) 2001-07-25

Family

ID=7784965

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97100501A Expired - Lifetime EP0789340B1 (fr) 1996-02-09 1997-01-15 Elément de sécurité pour la surveillance électronique d'articles

Country Status (3)

Country Link
EP (1) EP0789340B1 (fr)
DE (2) DE19604746A1 (fr)
ES (1) ES2160857T3 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0901100A2 (fr) * 1997-08-27 1999-03-10 Meto International GmbH Elément magnetique d'identification
EP0949598A2 (fr) * 1998-04-08 1999-10-13 Meto International GmbH Elément antivol électronique
WO2001078030A1 (fr) * 2000-04-07 2001-10-18 Rso Corporation N.V. Marque destinee a la teledetection d'articles
AU741785B2 (en) * 1998-12-14 2001-12-06 Meto International Gmbh Security element for electronic article surveillance and method of manufacturing a security element
US7469838B2 (en) 2001-12-10 2008-12-30 Brewster Kaleidoscope Llc Detectable components and detection apparatus for detecting such components

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19730694A1 (de) * 1997-07-17 1999-01-21 Meto International Gmbh Sicherungselement für die elektronische Artikelsicherung
DE19740442A1 (de) * 1997-09-15 1999-03-18 Meto International Gmbh Deaktivierbares Sicherungselement für die elektronische Überwachung von Artikeln
DE19858064A1 (de) * 1998-12-16 2000-06-21 Meto International Gmbh Sicherungselement für die elektronische Artikelsicherung
DE102012204660B4 (de) 2012-03-22 2018-02-08 Universität Kassel Magnetisches Echtheitsmerkmal

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0153286A2 (fr) * 1984-02-15 1985-08-28 Esselte Meto Eas International Ab Procédé et aménagement pour la détection d'un dispositif d'indication
US4660025A (en) 1984-11-26 1987-04-21 Sensormatic Electronics Corporation Article surveillance magnetic marker having an hysteresis loop with large Barkhausen discontinuities
EP0123586B1 (fr) 1983-03-25 1988-06-01 FAIRCHILD CAMERA & INSTRUMENT CORPORATION Circuit d'attaque à trois états de sortie possibles pour un équipement de test automatique
EP0448114A1 (fr) 1990-03-23 1991-09-25 Unitika Ltd. Matériel magnétique avec film mince et procédé pour produire celui-ci

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4980670A (en) * 1987-11-04 1990-12-25 Sensormatic Electronics Corporation Deactivatable E.A.S. marker having a step change in magnetic flux
GB8818849D0 (en) * 1988-08-09 1988-09-14 Emi Plc Thorn Electromagnetic identification system
DE4007701A1 (de) * 1990-03-10 1991-09-12 Vacuumschmelze Gmbh Deaktivierbarer diebstahlsicherungsstreifen
US5083112A (en) * 1990-06-01 1992-01-21 Minnesota Mining And Manufacturing Company Multi-layer thin-film eas marker
US5313192A (en) * 1992-07-02 1994-05-17 Sensormatic Electronics Corp. Deactivatable/reactivatable magnetic marker having a step change in magnetic flux

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0123586B1 (fr) 1983-03-25 1988-06-01 FAIRCHILD CAMERA & INSTRUMENT CORPORATION Circuit d'attaque à trois états de sortie possibles pour un équipement de test automatique
EP0153286A2 (fr) * 1984-02-15 1985-08-28 Esselte Meto Eas International Ab Procédé et aménagement pour la détection d'un dispositif d'indication
US4660025A (en) 1984-11-26 1987-04-21 Sensormatic Electronics Corporation Article surveillance magnetic marker having an hysteresis loop with large Barkhausen discontinuities
EP0448114A1 (fr) 1990-03-23 1991-09-25 Unitika Ltd. Matériel magnétique avec film mince et procédé pour produire celui-ci

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0901100A2 (fr) * 1997-08-27 1999-03-10 Meto International GmbH Elément magnetique d'identification
EP0901100A3 (fr) * 1997-08-27 2002-07-31 Meto International GmbH Elément magnetique d'identification
EP0949598A2 (fr) * 1998-04-08 1999-10-13 Meto International GmbH Elément antivol électronique
EP0949598A3 (fr) * 1998-04-08 2000-11-22 Meto International GmbH Elément antivol électronique
AU741785B2 (en) * 1998-12-14 2001-12-06 Meto International Gmbh Security element for electronic article surveillance and method of manufacturing a security element
WO2001078030A1 (fr) * 2000-04-07 2001-10-18 Rso Corporation N.V. Marque destinee a la teledetection d'articles
US7469838B2 (en) 2001-12-10 2008-12-30 Brewster Kaleidoscope Llc Detectable components and detection apparatus for detecting such components

Also Published As

Publication number Publication date
ES2160857T3 (es) 2001-11-16
DE59704093D1 (de) 2001-08-30
DE19604746A1 (de) 1997-08-14
EP0789340B1 (fr) 2001-07-25

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