EP0836163A1 - Elément de sécurité pour la surveillance électronique d'articles et procédé pour sa fabrication - Google Patents

Elément de sécurité pour la surveillance électronique d'articles et procédé pour sa fabrication Download PDF

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Publication number
EP0836163A1
EP0836163A1 EP97115235A EP97115235A EP0836163A1 EP 0836163 A1 EP0836163 A1 EP 0836163A1 EP 97115235 A EP97115235 A EP 97115235A EP 97115235 A EP97115235 A EP 97115235A EP 0836163 A1 EP0836163 A1 EP 0836163A1
Authority
EP
European Patent Office
Prior art keywords
strip
bias
securing
securing element
element according
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
EP97115235A
Other languages
German (de)
English (en)
Other versions
EP0836163B1 (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 EP0836163A1 publication Critical patent/EP0836163A1/fr
Application granted granted Critical
Publication of EP0836163B1 publication Critical patent/EP0836163B1/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 the electronic article surveillance in an electromagnetic Monitoring system consisting of a soft magnetic magnetostrictive stripe and one the stripe assigned bias element from a semi-hard or hard magnetic material (e.g. SEMIVAC from the company Vacuumschmelze), as well as a method for producing a such fuse element.
  • an electromagnetic Monitoring system consisting of a soft magnetic magnetostrictive stripe and one the stripe assigned bias element from a semi-hard or hard magnetic material (e.g. SEMIVAC from the company Vacuumschmelze), as well as a method for producing a such fuse element.
  • a securing element is already known from EP 0 093 281 B1 and a monitoring device for a corresponding one Security element that is provided on the surveillance goods has become known.
  • the securing element consists of an elongated strip of a preferably amorphous, magnetic material with high permeability and magnetostriction.
  • the strip is designed so that it is in the Frequency of the incident alternating magnetic field Mechanical vibration monitoring device is excited.
  • the elastic reverberation behavior and the thus coupled change via the magnetostrictive effect of magnetization in the strip induce a Voltage change in the receiving device.
  • Suitable alloy compositions can be used magnetostrictive properties of the strip in wide Ranges vary. All of these alloys have in common that a corresponding heat treatment more or less pronounced preferred direction across Longitudinal axis of the strip can be stamped.
  • This transverse anisotropy is necessary in order to Material with fields along the longitudinal axis of the strip to stimulate mechanical vibrations. Because the change in length square of the cosine of the change in magnetization depends on the largest change in length and thus the greatest magneto-elastic effect is achieved when the magnetization approximately in the 45 ° direction Longitudinal axis of the strip is set. Can be reached this is done by appropriately pre-magnetizing the strip in an external field of sufficient strength. Without Demagnetizing effects would be 0.7 times that Anisotropy field strength of the induced anisotropy necessary. In general, however, smaller ones are sufficient Field strengths.
  • the strength of the premagnetization thus determines both Amplitude of vibration as well as natural Streak resonance frequency.
  • the correct setting premagnetization is an essential prerequisite for that at the broadcast polling frequency of the transmitter an optimal resonance behavior of the strip is achieved.
  • Optimal means: the characteristic Signal has a sufficiently high vibration amplitude and also shows an optimal one Decay behavior.
  • EP 0 093 281 B1 is used for technical implementation the bias suggested using an or several magnetic elements that are magnetized and in close enough to the strip are sufficiently high To achieve stray field along the strip.
  • the Securing element can now be easily done disable that by demagnetizing the fuse element or by magnetizing the bias element the stray field in anti-parallel areas disappears.
  • this method does not work absolutely reliable.
  • EP 0 690 425 A1 suggested the strip during manufacture on the cut to suitable length. This is a relative cumbersome process that with high manufacturing costs connected is.
  • EP 0 696 784 A1 A workaround for this problem is proposed in EP 0 696 784 A1.
  • a bias element is also used here, the stray field of which is dimensioned such that the magneto-elastic strip can be magnetized to a higher degree.
  • the resonance frequency can be tuned to the respective frequency of the interrogation field within certain limits by targeted magnetization of the bias element, as a result of which inhomogeneities in the materials used can be compensated.
  • the disadvantage of this method is that, in order to optimize the magneto-elastic behavior of the strip, the magnetization of the bias element must be set individually by a suitable choice of an external field.
  • the invention has for its object a securing element and a method of manufacturing such Propose fuse element that is inexpensive are producible or an inexpensive manufacture the securing elements allowed.
  • the object is achieved with respect to the securing element according to the invention in that the bias element is designed in such a way that, by applying an essentially constant external field, it generates a stray field which optimizes the magneto-elastic properties of the strip.
  • Source security means that the security elements are integrated into the goods or their packaging during manufacture.
  • deactivated backup elements are used for source backups because unnecessary distribution of active backup elements is not desired. The activation takes place only on site within the area to be secured.
  • all of the securing elements can be activated by means of the same magnetic field.
  • Securing element provides that the strip and that Biasing element a distance d from each other to have.
  • the strip has a substantially linear magnetization curve having. Then there is a possibility that Securing element by demagnetizing the bias element to deactivate without causing false alarms comes in surveillance systems based on the harmonic Principle.
  • the bias element such is trained that it through the external field in the Saturation is driven, being its remanent Magnetization after saturation in an external field creates the desired stray field.
  • Securing element provides that the bias element is designed such that the Bias field generated stray field is smaller than that to achieve strip saturation required field. This configuration has the advantage that a later deactivation is then simple and reliable for all security systems through complete Magnetization can take place.
  • this is Bias element in areas of opposite Magnetization divides the strip like this premagnetize that it is deactivated.
  • the bias element free areas having.
  • the bias element air gaps of width a at a distance b or that holes with a radius r in the Biasing element are provided which are spaced s are arranged from each other.
  • An alternative embodiment proposes a heat treatment of the bias element in selected Areas of width a before, the areas a Have a distance b from each other.
  • the effect is comparable that achieved through material reduction: the component the magnetization is much in the selected areas smaller than in the surrounding areas of the Bias element.
  • the heat treatment can be done with common methods, such as power supply or energy supply by means of a laser or by inductive means.
  • the Fuse element according to the invention in the selected areas by creating a mechanical tension or a magnetic field preferred magnetic direction transverse to the longitudinal direction of the Biasing element is set.
  • the securing element is the width a of the selected one Areas small in terms of the distance d between the Strip and the bias element.
  • the method according to the invention provides that the physical properties of the bias element be changed so that the fuse element after switching off the external field a higher or a higher has lower remanent magnetization than before Modification.
  • the method is in one learning system is integrated.
  • the individual process steps continuously successive securing elements as long performed until the desired vibration behavior is reached.
  • This 'learning system' enables even minor changes in the specified values to compensate immediately so that all securing elements show the same vibration behavior.
  • Fig. 1a shows a perspective view of a Securing element 1, which is from the prior art has become known.
  • the securing element 1 consists of a soft magnetic, magnetostrictive strip 2 of Length 1 and one at a distance d from the strip 2 arranged biasing element 3 made of semi-hard or hard magnetic material.
  • Fig. 1b that is dependent on the magnetization M. Stray field of the bias element 3 shown. The Stray field 6 affects this Vibration behavior of the strip 2.
  • FIG. 2a shows a perspective view of a Embodiment of the securing element according to the invention 1.
  • the bias element 3 is at a distance b Areas 4 of width a.
  • Areas 4 are either material-free Areas 4 - a corresponding representation of the stray field 6 of the bias element 3 shown in FIG. 2b is sketched in Fig. 2b - or heat-treated Areas 4.
  • the heat treatment can be used with all common Methods are done: laser radiation, power supply, etc.
  • FIG. 2b A perspective view of a second embodiment of the securing element 1 according to the invention can be seen in FIG. 2c.
  • the magnetization M of the premagnetization element 3 is changed by circular areas 5.
  • Figures 3a and 3b show hysteresis curves (M-H diagrams) of trained according to the invention Bias elements 3 (dashed lines) and customary, not treated according to the invention Premagnetizing elements 3. Remanent magnetization is treated by the treatment of the bias elements 3 in the selected areas 4 changed significantly.
  • 4a shows a control program for carrying out the method according to the invention
  • 4b outlines the individual stations which are operated by the control program.
  • the arithmetic / control unit 9 is given the starting values for the width a of the selected areas 4 and the distance b of the selected areas 4 from one another.
  • the bias element 3 is treated in accordance with the predetermined values a, b for the selected areas 4. See also illustration 18 in FIG. 4b.
  • program item 12 the assembly of the securing element 1, consisting of a bias element 3 and a soft magnetic, magnetostrictive strip 2, is initiated. This process step is shown graphically in FIG. 4b under point 19.
  • the fuse element 1 is then driven to saturation in accordance with program point 13 in an external H field.
  • a transmitting device 7 is installed.
  • This transmitting device 7 can be electromagnets or permanent magnets.
  • the resonance frequency of the securing element 1 is then determined under program point 14.
  • the resonance frequency is measured by a receiving device 8, as shown in FIG. 4b under 20.
  • the measurement data are fed to the computing / control unit 9 for evaluation.
  • the computing / control unit now determines whether the measured resonance frequency matches the optimal value. If this query is answered in the affirmative, the method is continued with the specified values for a and b. If the resonance frequency does not match the specified value, a and b or a or b are varied at point 16.
  • the manufacturing method for the securing elements 1 is then carried out on the basis of the new initial values.

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  • 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)
EP97115235A 1996-10-12 1997-09-03 Elément de sécurité pour la surveillance électronique d'articles et procédé pour sa fabrication Expired - Lifetime EP0836163B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19642225 1996-10-12
DE19642225A DE19642225A1 (de) 1996-10-12 1996-10-12 Sicherungselement für die elektronische Artikelsicherung und Verfahren zur Herstellung eines Sicherungselementes

Publications (2)

Publication Number Publication Date
EP0836163A1 true EP0836163A1 (fr) 1998-04-15
EP0836163B1 EP0836163B1 (fr) 2002-02-06

Family

ID=7808635

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97115235A Expired - Lifetime EP0836163B1 (fr) 1996-10-12 1997-09-03 Elément de sécurité pour la surveillance électronique d'articles et procédé pour sa fabrication

Country Status (4)

Country Link
US (1) US5909177A (fr)
EP (1) EP0836163B1 (fr)
DE (2) DE19642225A1 (fr)
ES (1) ES2171795T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006501541A (ja) * 2002-09-10 2006-01-12 インゲニア・ホールディングス・リミテッド セキュリティデバイスおよびシステム

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9620190D0 (en) * 1996-09-27 1996-11-13 Flying Null Ltd Improved methods for coding magnetic tags
DE19650610A1 (de) * 1996-12-06 1998-06-10 Meto International Gmbh Verfahren und Vorrichtung zur Herstellung von elektronischen Sicherungselementen
DE19720319B4 (de) * 1997-05-15 2007-04-26 Meto International Gmbh Verfahren und Vorrichtung zur Herstellung von Sicherungselementen für die elektronische Artikelsicherung
DE19949298A1 (de) * 1999-10-13 2001-04-19 Meto International Gmbh Von einer Pulverlackschicht ummantelte Sicherungselemente für die Warensicherung sowie Guss- oder Spritzteile, die zur Diebstahlsicherung solche Teile enthalten
US6472987B1 (en) * 2000-07-14 2002-10-29 Massachusetts Institute Of Technology Wireless monitoring and identification using spatially inhomogeneous structures
DE10141312C1 (de) 2001-08-28 2003-05-22 Cts Fahrzeug Dachsysteme Gmbh Fahrzeugdach mit einem zwischen Schließposition und Öffnungsposition verstellbaren Verdeck
IL151050A0 (en) * 2002-01-24 2003-04-10 Advanced Coding Systems Ltd A magnetic tag and a method for reading the tag
DE10300254A1 (de) * 2003-01-03 2004-07-22 Focke & Co. (Gmbh & Co.) Packung, insbesondere Zigarettenpackung
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
US7023345B2 (en) * 2004-05-03 2006-04-04 Sensormatic Electronics Corporation Enhancing magneto-impedance modulation using magnetomechanical resonance
GB2449669A (en) * 2007-05-30 2008-12-03 Sca Hygiene Prod Ab Method of manufacturing a magnetoelastic sensor with a predetermined resonant frequency
CN110825115B (zh) * 2019-11-29 2023-04-07 中国航空工业集团公司沈阳飞机设计研究所 一种飞机迎角和过载的极限限制控制方法

Citations (3)

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Publication number Priority date Publication date Assignee Title
EP0295085A1 (fr) * 1987-06-08 1988-12-14 Esselte Meto International GmbH Détection et/ou identification d'articles utilisant des dispositifs magnétiques
US5017907A (en) * 1990-01-16 1991-05-21 Pitney Bowes Inc. Double pulse magnetic markers
EP0696784A1 (fr) * 1994-08-10 1996-02-14 Sensormatic Electronics Corporation Etiquette magnétomécanique de surveillance d'objets avec fréquence de résonance accordable

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US4510489A (en) * 1982-04-29 1985-04-09 Allied Corporation Surveillance system having magnetomechanical marker
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US4746908A (en) * 1986-09-19 1988-05-24 Minnesota Mining And Manufacturing Company Dual-status, magnetically imagable article surveillance marker
ES2040343T3 (es) * 1987-06-08 1993-10-16 Esselte Meto International Gmbh Dispositivos magneticos.
US4882569A (en) * 1988-07-26 1989-11-21 Security Tag Systems, Inc. Deactivatable fequency-dividing-transponder tag
GB8817855D0 (en) * 1988-07-27 1988-09-01 Emi Plc Thorn Electromagnetic identification system
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US5368948A (en) * 1989-01-09 1994-11-29 Esselte Meto International Produktions Magnetic materials for security applications
US4967185A (en) * 1989-08-08 1990-10-30 Minnesota Mining And Manufacturing Company Multi-directionally responsive, dual-status, magnetic article surveillance marker having continuous keeper
US5355120A (en) * 1992-10-09 1994-10-11 Security Tag Systems, Inc. Frequency-dividing-transponder tag
US5432499A (en) * 1993-05-27 1995-07-11 Minnesota Mining And Manufacturing Company Collector type article surveillance marker with continuous keeper
US5414412A (en) * 1993-06-16 1995-05-09 Security Tag Systems, Inc. Frequency dividing transponder, including amorphous magnetic alloy and tripole strip of magnetic material
US5399372A (en) * 1993-11-08 1995-03-21 Southwall Technologies, Inc. Method of patterning magnetic members
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Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
EP0295085A1 (fr) * 1987-06-08 1988-12-14 Esselte Meto International GmbH Détection et/ou identification d'articles utilisant des dispositifs magnétiques
US5017907A (en) * 1990-01-16 1991-05-21 Pitney Bowes Inc. Double pulse magnetic markers
EP0696784A1 (fr) * 1994-08-10 1996-02-14 Sensormatic Electronics Corporation Etiquette magnétomécanique de surveillance d'objets avec fréquence de résonance accordable

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006501541A (ja) * 2002-09-10 2006-01-12 インゲニア・ホールディングス・リミテッド セキュリティデバイスおよびシステム

Also Published As

Publication number Publication date
EP0836163B1 (fr) 2002-02-06
US5909177A (en) 1999-06-01
ES2171795T3 (es) 2002-09-16
DE59706287D1 (de) 2002-03-21
DE19642225A1 (de) 1998-04-16

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