EP0789340B1 - 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
EP0789340B1
EP0789340B1 EP97100501A EP97100501A EP0789340B1 EP 0789340 B1 EP0789340 B1 EP 0789340B1 EP 97100501 A EP97100501 A EP 97100501A EP 97100501 A EP97100501 A EP 97100501A EP 0789340 B1 EP0789340 B1 EP 0789340B1
Authority
EP
European Patent Office
Prior art keywords
hard
security element
magnetic material
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.)
Expired - Lifetime
Application number
EP97100501A
Other languages
German (de)
English (en)
Other versions
EP0789340A1 (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
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 Meto International GmbH filed Critical 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 securing element for electronic article surveillance, consisting of a Material with high permeability and low coercive force (soft magnetic material), which is created when an outer magnetic alternating field in an interrogation zone characteristic signal which is transmitted by means of a Detector device is recognizable.
  • the characteristic signal therefore occurs periodically with the Frequency of the low-frequency field.
  • harmonic Detection system only one interrogation field in the kHz range to excite the Use security element, the characteristic signal of the fuse element in turn in time with a low-frequency field, which is the soft magnetic Material between the two saturations drifts, occurs.
  • the shape of the characteristic For the purpose of evaluation, the shape of the characteristic Then signal with a predetermined waveform compared. If the two match, this is called unauthorized stay of a secured article in the Interrogation zone interpreted; an alarm shows that Operating theft.
  • 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”.
  • the properties of these materials and the physical basis 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 references 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 increased if in the Near the material with the Barkhausen effect soft magnetic material is arranged so that the Couple stray fields of both materials.
  • the signal of a appropriately prepared securing element is so strong that it is with relatively small dimensions of used materials reliably in the query zone of a Detection system is detected.
  • Draw fuse elements of the type described above is characterized by a characteristic signal that blatant of that in a harmonic detection system discernible signal form deviates. The consequence of this is that an article that acts as a security element soft magnetic material and a material with high Barkhausen effect carries in a harmonious Detection system not recognized as a secured item becomes. Since no alarm is subsequently triggered, the Articles despite electronic security the query zone pass unhindered.
  • the invention is based on the object Securing element, which is made of a soft magnetic Material and a material with a high Barkhausen effect composed to modify such that it from a harmonic detection system is recognized.
  • the object is achieved in that in addition to soft magnetic material and the material with a high Barkhausen effect - whereby the material with the high Barkhausen effect regarding the soft magnetic material is arranged so that both over their stray fields are coupled - a semi-hard or hard magnetic Material is provided which is the material with the high Barkhausen effect premagnetized.
  • a semi-hard or hard magnetic Material is provided which is the material with the high Barkhausen effect premagnetized.
  • the Securing element according to the invention is the soft magnetic material and / or the Material with the high Barkhausen effect around one Thin film material is.
  • Fuse elements Thin-layer materials are already from EP 0 295 028 B1 known.
  • the soft magnetic material and / or Material with the high Barkhausen effect in stripes is / are formed or from a drawn wire exists / exist.
  • the semi-hard or hard magnetic material can a thin film material can also be used.
  • Alternative designs punch a perforated film, preferably a Ni perforated foil - or a ferrite layer in front.
  • the semi-hard or hard magnetic material in individual Sections is arranged. Again it turned out to be Exposed favorably if the sections as quasi third layer on the material with the high Barkhausen effect are positioned, as a result of this optimal interaction of the stray field of the semi-hard or hard magnetic material with the stray field of the material is achieved with the high Barkhausen effect, while the Influencing the stray field of the soft magnetic Material is relatively low.
  • 'Individual sections' can in addition to the literal interpretation also mean that the semi-hard or hard magnetic material in selected Areas with low permeability towards the Has preferred axis of the securing element.
  • An advantageous embodiment provides that the semi-hard or hard magnetic material a desired Has bias in one direction.
  • this is expressed in such a way that the portion of the signal from the material with the Barkhausen effect arises, disappears; the signal itself is due to the premagnetization when excited by a alternating magnetic field in the direction of the positive or the negative timeline shifted.
  • the semi-hard or hard magnetic material has selected sections, which are premagnetized in opposite directions, preferably two sections each with opposite magnetization are next to each other. This allows time shifts, as in the design with a bias in one Direction, compensate.
  • the detection system is said to have paid for goods properly subsequently of course no longer trigger an alarm.
  • the semi-hard or hard magnetic material like this chosen that it in the saturated state characteristic signal of the soft magnetic material and the material with the high Barkhausen effect in the Interrogation zone prevented.
  • the Deactivator material so a strong magnetic field exposed to being driven to saturation.
  • Fig. 1 shows the hysteresis curves of a soft magnetic Material 1 and a material with a high Barkhausen effect 2, both materials 1, 2 relative to each other in this way are arranged that their stray fields 7 are not together interact. From this illustration it is clearly evident that the hysteresis curve of the soft magnetic material 1 one between the two saturation states has a substantially linear course, during the Transition in the case of material with the high Barkhausen effect 2 erratic and therefore not steady he follows.
  • Fig. 2a in addition to the hysteresis curves soft magnetic material 1 and a material with a high Barkhausen effect 2 shows the hysteresis curve 1 + 2, which results when the stray fields 7 of the two Couple materials 1, 2 together.
  • the four boxes with the arrows indicate the direction of magnetization of the soft magnetic material 1 and the material with the high Barkhausen effect 2.
  • both Saturation states are both soft magnetic Material 1 as well as the material with the high one Barkhausen effect 2 magnetized in one direction. By doing Transition area between the two saturation states first changes the soft magnetic material 1 each Magnetization direction.
  • Stray field 7 of the soft magnetic material 1 delays the sudden magnetic reversal of the material with the high Barkhausen effect 2: the hysteresis curve 1 + 2 is partial linear, sometimes it shows a sudden change.
  • the made of a soft magnetic material 1 and a material with high Barkhausen effect 2 has the resulting characteristic signal 4 the form shown in Fig. 2b.
  • This characteristic signal 4 differs from the characteristic signal 4, which from a soft magnetic material 1 in response to a query field is sent (see Fig. 3c) by a asymmetrical double peak.
  • This form of characteristic signal 4 is in a harmonic Detection system not as of an electronic secured article originated recognized.
  • the Securing element consists of a soft magnetic Material 1, an overlying material with a high Barkhausen effect 2 and from individual sections a semi-hard or hard magnetic material 6.
  • the Portions of the semi-hard or hard magnetic material 6 are pre-magnetized in such a way that in particular the spatial closer stray field 7 of the material with the high Barkhausen effect 2 is affected. Interacting with the stray field 7 of the semi-hard or hard magnetic Material 6 is dimensioned so that the material with the high Barkhausen effect 2 in the alternating magnetic field Query zone makes no signal contributions.
  • the hysteresis curve of that shown in Fig. 3a Embodiment of the securing element according to the invention corresponds - as can be seen from FIG. 3b - in essentially the hysteresis curve of a soft magnetic Materials 1.
  • the hysteresis curve is around one Amount Hb shifted in the direction of the positive H axis. How already mentioned in the previous place shows that characteristic signal 4 now the desired shape, the with a harmonic detection system detected and as belonging to a secured article is evaluated.
  • the semi-hard or hard magnetic material 6 only pre-magnetized in one direction, that shows characteristic signal 4 as well as the associated one Hysteresis curve a shift towards the Time axis or in the direction of the H axis. On the relative The distance between the peaks 5 of the characteristic signal 4 changes but nothing. The shifting effect described above can be avoided if - as can be seen in FIG. 4a - the semi-hard or hard magnetic material 6 des Security element by the same amount in both Directions is magnetized.
  • Fig. 4b shows the resulting symmetrical to Coordinate origin hysteresis curve 3 des Securing element according to the invention, which in Fig. 4a is recorded.

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)

Claims (10)

  1. Élément de sécurité (8) destiné à la surveillance électronique d'articles, comportant une matière présentant une grande perméabilité et une faible force coercitive qui, exposé à un champ magnétique alternatif extérieur dans une zone de balayage, émet un signal caractéristique (4) identifiable par un dispositif de détection, ledit élément de sécurité comportant une matière exerçant un puissant effet de Barkhausen (2), agencée par rapport à la matière présentant une grande perméabilité et une faible force coercitive (1) de manière à conjuguer leurs champs de fuite (7), et comportant, d'autre part, une matière magnétique dure ou mi-dure (6) capable de prémagnétiser la matière exerçant un puissant effet de Barkhausen (2).
  2. Élément de sécurité suivant la revendication 1 caractérisé en ce que la matière présentant une grande perméabilité et une faible force coercitive (1) et/ou la matière exerçant un puissant effet de Barkhausen (2) sont mises en oeuvre sous la forme d'un matériau en couche mince.
  3. Élément de sécurité selon la revendication 1 caractérisé en ce que la matière magnétique dure ou mi-dure (6) est mise en oeuvre sous la forme d'un matériau en couche mince, d'un film perforé ou d'une couche de ferrite.
  4. Élément de sécurité suivant les revendications 1 ou 2, caractérisé en ce que la matière présentant une grande perméabilité et une faible force coercitive (1) et/ou la matière exerçant un puissant effet de Barkhausen (2) sont mises en oeuvre sous la forme d'un ruban ou d'un fil étiré.
  5. Élément de sécurité selon l'une quelconque des revendications 1, 2 ou 3, caractérisé par le fait que la matière présentant une grande perméabilité et une faible force coercitive (1) d'une part et la matière exerçant un puissant effet de Barkhausen (2) d'autre part, sont disposées en chevauchement au moins partiel l'une par rapport à l'autre.
  6. Élément de sécurité suivant l'une des revendications 1 ou 4, caractérisé en ce que la matière magnétique dure ou mi-dure (6) est mise en oeuvre sous la forme de segments distincts.
  7. Élément de sécurité suivant l'une des revendications 1 ou 6, caractérisé par le fait que la matière magnétique dure ou mi-dure (6) est agencée par rapport aux deux autres (1, 2) de manière à ce que son champ de fuite exerce ses effets en alternance avec celui de la matière exerçant un puissant effet de Barkhausen (2).
  8. Élément de sécurité selon l'une des revendications 1 ou 6, caractérisé par le fait que la matière magnétique dure ou mi-dure (6) exerce l'effet de prémagnétisation voulu dans un sens.
  9. Élément de sécurité suivant l'une des revendications 1 ou 6, caractérisé par le fait que la matière magnétique dure ou mi-dure (6) est mise en oeuvre sous la forme de segments distincts prémagnétisés dans des sens opposés, de préférence par paires contiguës successives.
  10. Élément de sécurité selon la revendication 1, caractérisé en ce qu'il est réalisé de manière à ce que la matière magnétique dure ou mi-dure (6) interrompe à l'état saturé l'émission du signal caractéristique (4) dans la zone de balayage par la matière présentant une grande perméabilité et une faible force coercitive (1) comme par la matière exerçant un puissant effet de Barkhausen (2).
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
DE19604746 1996-02-09
DE19604746A DE19604746A1 (de) 1996-02-09 1996-02-09 Sicherungselement für die elektronische Artikelsicherung

Publications (2)

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

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

Families Citing this family (9)

* 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
DE19737342A1 (de) * 1997-08-27 1999-03-04 Meto International Gmbh Identifizierungselement und Verfahren zur Herstellung eines Identifizierungselements
DE19740442A1 (de) * 1997-09-15 1999-03-18 Meto International Gmbh Deaktivierbares Sicherungselement für die elektronische Überwachung von Artikeln
DE19815583A1 (de) * 1998-04-08 1999-10-14 Meto International Gmbh Element für die elektronische Artikelsicherung oder für die Sensortechnik
DE19857583A1 (de) * 1998-12-14 2000-06-15 Meto International Gmbh Sicherungselement für die elektronische Artikelsicherung und Verfahren zur Herstellung eines Sicherungselementes
DE19858064A1 (de) * 1998-12-16 2000-06-21 Meto International Gmbh Sicherungselement für die elektronische Artikelsicherung
AU2000249618A1 (en) * 2000-04-07 2001-10-23 Rso Corporation N.V. A marker for remote detection of articles
WO2003054825A2 (fr) 2001-12-10 2003-07-03 Innovision Research & Technology Plc Composants detectables et appareil de detection concu pour detecter de tels composants
DE102012204660B4 (de) 2012-03-22 2018-02-08 Universität Kassel Magnetisches Echtheitsmerkmal

Family Cites Families (9)

* 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
BR8505670A (pt) * 1984-02-15 1986-02-18 Intermodulation & Safety Syst Metodo e sistema para detectar presenca de dispositivo indicados numa zona limitada de investigacao
US4660025A (en) * 1984-11-26 1987-04-21 Sensormatic Electronics Corporation Article surveillance magnetic marker having an hysteresis loop with large Barkhausen discontinuities
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
JPH04218905A (ja) 1990-03-23 1992-08-10 Unitika Ltd 薄膜状磁性材料及びその製造方法
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

Also Published As

Publication number Publication date
EP0789340A1 (fr) 1997-08-13
DE59704093D1 (de) 2001-08-30
ES2160857T3 (es) 2001-11-16
DE19604746A1 (de) 1997-08-14

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