EP0949598A2 - Elément antivol électronique - Google Patents

Elément antivol électronique Download PDF

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Publication number
EP0949598A2
EP0949598A2 EP99104717A EP99104717A EP0949598A2 EP 0949598 A2 EP0949598 A2 EP 0949598A2 EP 99104717 A EP99104717 A EP 99104717A EP 99104717 A EP99104717 A EP 99104717A EP 0949598 A2 EP0949598 A2 EP 0949598A2
Authority
EP
European Patent Office
Prior art keywords
barkhausen
sections
soft magnetic
magnetic material
length
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
EP99104717A
Other languages
German (de)
English (en)
Other versions
EP0949598A3 (fr
EP0949598B1 (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 EP0949598A2 publication Critical patent/EP0949598A2/fr
Publication of EP0949598A3 publication Critical patent/EP0949598A3/fr
Application granted granted Critical
Publication of EP0949598B1 publication Critical patent/EP0949598B1/fr
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
    • 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

Definitions

  • the invention relates to an element for electronic article surveillance or for the sensor technology, consisting of a strip-shaped or wire-shaped Barkhausen material of length L, which is in an external magnetic Alternating field is excited to emit a characteristic signal, and a soft magnetic material that the Barkhausen material assigned.
  • Barkhausen material - also called pulse wires - are both for electronic article surveillance as well as for so-called pulse wire sensors in sensor technology. They are characterized by an almost rectangular Hysteresis curve, i.e. the magnetic reversal in an external magnetic Alternating field occurs almost suddenly, as soon as the field of excitation has reached the predetermined threshold.
  • suitable elements are described, for example, in US 4,247,601 US 4,660,025, EP 0 309 679 B1 and EP 0 762 354 A1.
  • the sudden magnetic reversal of wire-shaped or strip-shaped Barkhausen materials in an external alternating field is the result of one pronounced uniaxial anisotropy along the longitudinal axis of the wire or the strip.
  • This anisotropy suppresses bothersome Turning processes during the magnetic reversal process as well as the formation of terminating domain structures before reaching the panel strength - would but the formation of appropriate structures to round off the Hysteresis curve and thus a deterioration in the switching characteristics to lead.
  • an amorphous band or an amorphous wire made of Barkhausen material as a security element for the to use electronic article surveillance.
  • the amorphous material at least one further strip of soft magnetic Material associated with which is preferably the ends of the amorphous Material towers.
  • the invention has for its object a cost-effective element for to propose electronic article surveillance or for sensor technology, the does not have the aforementioned disadvantages.
  • the object is achieved in that the soft magnetic material individual sections of a predetermined length, which in one predetermined distance from each other, and that the sections the soft magnetic material with respect to the Barkhausen material are positioned that the magnetic stray fields generated by them with the Coupling magnetization of the Barkhausen material.
  • the stray field coupling stabilizes the biased causes wire-like or strip-like Barkhausen material.
  • the stray field coupling stabilizes the biased causes wire-like or strip-like Barkhausen material.
  • the corresponding securing elements can be used as continuous straps manufacture. From the tapes, labels can then be created for each Use case length are punched out.
  • the sections of the soft magnetic material To couple the sections of the soft magnetic material with the To optimize Barkhausen material, the sections of the arrange soft magnetic material on the Barkhausen material.
  • the sections of the soft magnetic material and the Barkhausen material have essentially the same width. Will continue suggested that the sections of the soft magnetic material in the essentially evenly distributed over the length of the Barkhausen material are.
  • the invention For use as pulse wires in sensors, the invention has Element the advantage that the ends are not covered. This will make it possible, the distance between the actual sensor and the field source to keep low. Especially with such sensors, but increasingly Dimensions also for elements for electronic article surveillance (especially for small articles) is an embodiment of the invention Switching element to be regarded as particularly favorable, in which - as already mentioned - The length of the strip-shaped or wire-shaped Barkhausen material is chosen relatively low. By coordinating the length, the distance and the permeability of the sections of the soft magnetic material can be the characteristic signal of the element for the respective length of the Optimize Barkhausen material. So it enables the invention Solution, the length of known from the prior art Shorten Barkhausen elements by about half without the Panel strength increase dramatically. This inevitably leads to considerable Material savings, which is why the securing elements according to the invention are relatively inexpensive. This is also supported by the previous ones described simple and inexpensive methods of manufacturing.
  • an advantageous training suggests that sections a semi-hard or hard magnetic material are provided, which in immediate vicinity of the Barkhausen material and the sections of the soft magnetic Material are arranged.
  • An embodiment of an element according to the invention that can be deactivated before that the sections of soft magnetic material and the sections of the semi-hard or hard magnetic material along the length of the Barkhausen material are arranged alternately in succession.
  • the sections of the soft magnetic material and the sections of the semi-hard or hard magnetic material and the Barkhausen material in have essentially the same width.
  • Fig. 1 shows a schematic representation of the switching behavior of known Barkhausen elements of various lengths in the M-H diagram. While the Hysteresis curve of the longer Barkhausen element - characterized by (I) - runs almost rectangular and thus when the respective one is reached Switching field strengths suddenly magnetized, shows the shorter one Barkhausen element - characterized by (II) - a hysteresis curve on the deviates significantly from the desired rectangular shape. Magnetic reversal no longer occurs suddenly at a given field strength of the external magnetic field H, but continuously while the external Magnetic field passes through a certain area.
  • the magnetization in the Barkhausen elements is from the saturated State coming in field H1, when field strength H2 is reached in the lower one Represented area of the drawing. While in the case of the longer one Barkhausen element the magnetization of the edge areas negligible is small, it occurs in the shorter Barkhausen element due to the increased demagnetization effect well before reaching the actual panel strength Hs. The consequence of this is that the Magnetization process of the shorter element is much less sudden runs as that of the longer element. This makes the detection probability in electronic article surveillance systems based on the Generation of higher harmonics of the fundamental frequency of the query field based, drastically reduced.
  • FIG. 2 is an perspective view of an embodiment of the invention Elements for electronic article surveillance or for sensor technology shown.
  • Fig. 3 shows the embodiment in plan view.
  • sections 3 of a soft magnetic material of length a arranged on a strip-shaped Barkhausen material 2 b sections 3 of a soft magnetic material of length a arranged.
  • the solution according to the invention is due to stray field couplings stabilization of the prestressed Barkhausen material 2 reached.
  • the length a and the Distance b of the sections 3 of the soft magnetic material can do that Switching behavior also decided relatively short Barkhausen elements 1 can be improved without an undesirable increase in intrinsic panel strength would be necessary.
  • an intrinsic switching field strength is the switching field strength of an "infinitely" long Barkhausen element designated.
  • FIG Fig. 4 A deactivatable embodiment of the element 1 according to the invention is shown in FIG Fig. 4 can be seen in cross section.
  • On the strip-shaped Barkhausen material 2 are at a distance b from each other sections 3 of length a made of soft magnetic Material arranged.
  • sections 4 of a semi-hard or hard magnetic material are arranged. Sections 4 are used in a known manner to deactivate the Fuse element 1. Is such a high on the fuse element 1 Magnetic field applied that the sections 4 of the semi-hard or hard magnetic Materials are driven to saturation, so they prevent subsequently a reaction of the Barkhausen material 2 to the outside magnetic query field H.
  • Fig. 5 shows a schematic representation of the switching behavior of the Elements 1 according to the invention for electronic article surveillance or for the sensor technology. While the strip or wire Barkhausen material 2 taken by itself the already mentioned several times has a rectangular hysteresis curve, the hysteresis curve has Sections 3 of the soft magnetic material have a typically sheared shape.
  • the solution according to the invention is characterized in that a strip-like or wire-like Barkhausen material 2 of short length L is used. Without those arranged on the Barkhausen material 2 Sections 3 of the soft magnetic material would change the hysteresis curve into Fig. 1 shown rounded shape (hysteresis curve II).
  • Barkhausen material 2 becomes prestressed Barkhausen material 2 stabilized due to stray field coupling. That also has the short Barkhausen element 1 shows a rectangular hysteresis curve and consequently shows the desired switching behavior when applying an external magnetic Alternating field H.

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)
EP99104717A 1998-04-08 1999-03-10 Elément antivol électronique Expired - Lifetime EP0949598B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19815583 1998-04-08
DE19815583A DE19815583A1 (de) 1998-04-08 1998-04-08 Element für die elektronische Artikelsicherung oder für die Sensortechnik

Publications (3)

Publication Number Publication Date
EP0949598A2 true EP0949598A2 (fr) 1999-10-13
EP0949598A3 EP0949598A3 (fr) 2000-11-22
EP0949598B1 EP0949598B1 (fr) 2003-12-03

Family

ID=7863889

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99104717A Expired - Lifetime EP0949598B1 (fr) 1998-04-08 1999-03-10 Elément antivol électronique

Country Status (6)

Country Link
US (1) US6259368B1 (fr)
EP (1) EP0949598B1 (fr)
JP (1) JP4159697B2 (fr)
DE (2) DE19815583A1 (fr)
DK (1) DK0949598T3 (fr)
ES (1) ES2212404T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8244632B2 (en) 2001-10-26 2012-08-14 First Data Corporation Automated transfer with stored value

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6690279B1 (en) * 1998-07-22 2004-02-10 Meto International Gmbh Security element for the electronic surveillance of articles
DE19958466A1 (de) * 1999-12-04 2001-06-07 Meto International Gmbh Vorrichtung und Verfahren zum Anzeigen des Zustands von EM- oder AM-Sicherungsetiketten
EP1258538B1 (fr) * 2000-07-17 2006-10-11 NHK Spring Co., Ltd. Marqueur magnetique et procede de fabrication correspondant
ES2268964B1 (es) * 2005-04-21 2008-04-16 Micromag 2000, S.L. "etiqueta magnetica activable/desactivable basada en microhilo magnetico y metodo de obtencion de la misma".
RU2292588C1 (ru) * 2005-07-12 2007-01-27 Бетелин Владимир Борисович Устройство для идентификации и способ его опроса
WO2009145746A1 (fr) * 2008-04-18 2009-12-03 Metglas, Inc. Dispositif de détection à distance de températures, et procédé correspondant de détection à distance de températures
WO2009128803A1 (fr) * 2008-04-18 2009-10-22 Metglas, Inc. Détecteur de température et procédé de détection de température à distance apparenté
DE102009043462A1 (de) * 2009-09-30 2011-03-31 Vacuumschmelze Gmbh & Co. Kg Magnetischer Streifen, Sensor aufweisend einen magnetischen Streifen und Verfahren zur Herstellung eines magnetischen Streifens
JP2014171044A (ja) * 2013-03-01 2014-09-18 Yokohama National Univ 電気パルス発生装置、及び電気パルス発生装方法

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1234891A (fr) * 1983-10-20 1988-04-05 746278 Ontario Limited D/B/A I.D. Systems Canada Vignette pour systeme de securite
GB8713353D0 (en) * 1987-06-08 1987-07-15 Scient Generics Ltd Magnetic article surveillance systems
US4829288A (en) * 1987-11-30 1989-05-09 Minnesota Mining And Manufacturing Company Economic, multi-directionally responsive marker for use in electronic article surveillance systems
US4882569A (en) * 1988-07-26 1989-11-21 Security Tag Systems, Inc. Deactivatable fequency-dividing-transponder tag
JPH08186019A (ja) * 1994-11-02 1996-07-16 Unitika Ltd 磁気マーカ
US5554974A (en) * 1994-11-23 1996-09-10 International Business Machines Corporation Encodable tag with radio frequency readout
US5519379A (en) * 1995-04-10 1996-05-21 Sensormatic Electronics Corporation Multi-thread re-entrant marker with simultaneous switching
DE19533362A1 (de) * 1995-09-09 1997-03-13 Vacuumschmelze Gmbh Längsgestreckter Körper als Sicherungsetikett für elektromagnetische Diebstahlsicherungssysteme
CA2189827A1 (fr) * 1995-11-08 1997-05-09 Tatsuya Matsumoto Etiquette antivol
DE19604746A1 (de) * 1996-02-09 1997-08-14 Esselte Meto Int Gmbh Sicherungselement für die elektronische Artikelsicherung
US5835016A (en) * 1997-12-15 1998-11-10 Sensormatic Electronics Corporation Multi-thread re-entrant marker with transverse anisotropy flux concentrators
US6023226A (en) * 1998-01-29 2000-02-08 Sensormatic Electronics Corporation EAS marker with flux concentrators having magnetic anisotropy oriented transversely to length of active element

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8244632B2 (en) 2001-10-26 2012-08-14 First Data Corporation Automated transfer with stored value

Also Published As

Publication number Publication date
JP4159697B2 (ja) 2008-10-01
EP0949598A3 (fr) 2000-11-22
EP0949598B1 (fr) 2003-12-03
DE59907905D1 (de) 2004-01-15
DK0949598T3 (da) 2004-03-29
DE19815583A1 (de) 1999-10-14
ES2212404T3 (es) 2004-07-16
US6259368B1 (en) 2001-07-10
JPH11328549A (ja) 1999-11-30

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