EP0628936A1 - Multirichtungsempfindliches Etikett für die Warenüberwachung - Google Patents

Multirichtungsempfindliches Etikett für die Warenüberwachung Download PDF

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Publication number
EP0628936A1
EP0628936A1 EP94107232A EP94107232A EP0628936A1 EP 0628936 A1 EP0628936 A1 EP 0628936A1 EP 94107232 A EP94107232 A EP 94107232A EP 94107232 A EP94107232 A EP 94107232A EP 0628936 A1 EP0628936 A1 EP 0628936A1
Authority
EP
European Patent Office
Prior art keywords
band
electronic surveillance
further characterized
surveillance marker
anyone
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
EP94107232A
Other languages
English (en)
French (fr)
Other versions
EP0628936B1 (de
Inventor
Peter Y. Zhou
Thomas P. Solaski
Dennis P. Donaldson
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.)
Sensormatic Electronics Corp
Original Assignee
Sensormatic Electronics Corp
Knogo Corp
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 Sensormatic Electronics Corp, Knogo Corp filed Critical Sensormatic Electronics Corp
Publication of EP0628936A1 publication Critical patent/EP0628936A1/de
Application granted granted Critical
Publication of EP0628936B1 publication Critical patent/EP0628936B1/de
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

  • This invention relates to markers or targets for electronic article surveillance and more particularly it concerns a novel magnetically saturable marker characterized by a multidirectional sensitivity.
  • United States Patents No. 3,820,103, No. 3,820,104 and No. 3,665,449 describe magnetically saturable markers for use in electromagnetic type surveillance systems. These systems are generally used to reduce theft by shoplifting but they are also used to detect the unauthorized movement of articles in other environments.
  • the markers shown in these patents are elongated strips of magnetically soft material having a high magnetic permeability and a low magnetic coercivity. When exposed to an alternating magnetic field in an interrogation region, for example, the exit from a store, these targets or markers become magnetically saturated in opposite directions during each cycle of the alternating magnetic interrogation field. As a result they disturb the field in a characteristic manner to produce harmonics which can be detected.
  • the targets or markers should have the configuration of an elongated open strip with a high ratio of length to cross-sectional area for maximum sensitivity to the interrogating magnetic fields.
  • the ratio of length to the square root of cross sectional are below 150, the magnetization reversal signal amplitude decreases radically and becomes noticeably dependent on orientation of the open strip within the magnetic field.
  • the open strip may have one or more major dimensions satisfying this criteria.
  • U.S. Patent No. 4,074,249 describes a crescent shaped target which is less sensitive to orientation than the straight elongated open strip markers.
  • U.S. Patent No. 4,075,618 describes thin elongated markers which have enlarged flux concentrators at the ends thereof to enable the markers to be shortened without reduction in their sensitivity.
  • Compact disc recordings for example, have only a small ring shaped region around a center opening that would allow for the placement of a marker.
  • the strips are shortened to fit into small areas, their sensitivity becomes highly dependent on their orientation relative to the interrogating magnetic field. This is a problem when the markers are used for theft detection because in that case, it is not possible to control their orientation when they are carried through an interrogation zone.
  • the present invention overcomes the above described problems of the prior art and makes possible the protection of articles which have minimal space for marker attachment. At the same time the invention reduces the dependency of the marker orientation on the direction of the magnetic interrogation field.
  • an electronic surveillance marker which has multidirectional sensitivity and which comprises a band of material extending in a flat plane and formed in a closed loop.
  • the material of this marker has magnetic properties of high permeability, low coercivity and ready magnetic saturability.
  • this band has a plurality of spaced apart cutout regions which form narrowed strips along the band. These narrowed strips increase the ratio of length to cross section of regions of the band and thereby allow the band to produce sharp responses when it is interrogated by an alternating magnetic field.
  • the regions of the band between the cutouts provide an increased mass which cooperate with the strip regions to produce higher energy responses than could be obtained with the narrow strip portions by themselves. Because the band is formed in a closed loop, its orientation sensitivity relative to the interrogation field is less than that of an open loop strip shaped marker of the same length.
  • An electronic article surveillance marker 10 is a band in the shape of a flat ring and is made of sheet metal having special magnetic properties, namely, it has high magnetic permeability and low magnetic coercivity and is easily magnetically saturable.
  • the marker 10 may be made of permalloy or material having magnetic properties similar to permalloy, such as amorphous magnetic material. A suitable material is described in U.S. Patent No. 5,146,204.
  • the marker 10 of Fig. 1 has a plurality of elongated cutouts 12 spaced apart along the length of the band. Each cutout is contained entirely within the band and thereby forms a pair of very thin narrowed segments 10a and 10b which are parallel to each other and which interconnect full width segments 10c. These cutouts 12 are preferably evenly distributed around the marker 10.
  • the marker 10 has and inner diameter d of 16 millimeters and an outer diameter D of 22 millimeters.
  • the width of the band which forms the ring is thus about three millimeters.
  • the marker 10 has a thickness of about 15 microns.
  • the cutouts 12 have a width of about two millimeters and they extend over an arc of about 360.
  • the thin narrowed segments 10a and 10b each have a width of about 0.5 millimeters and a length of about six millimeters.
  • a marker with the above described shape and dimensions and made of permalloy will produce good responses to a magnetic interrogating field in an electronic article surveillance system, with reduced dependence on orientation relative to the interrogating field. These good responses are due firstly, to the fact that the cutouts 12 produce very narrow lengths 10a and 10b in which the ratio of length to cross-sectional area is high, and secondly, to the fact that the regions 10c between the strips provide large masses which will provide regions for deactivation purpose.
  • the marker is formed in a closed loop and because the lengths 10a and 10b extend in different directions at different locations along the marker, the orientation sensitivity of the marker relative to the direction of the interrogating magnetic field is minimized.
  • the marker 10 is preferably made from a sheet of high permeability low coercivity readily magnetizable material which is then formed into the above described configuration by means of conventional photoetching techniques. Other techniques, such as mechanical stamping, may also be used.
  • Fig. 2 shows the marker 10 of Fig. 1 as attached to a compact disc 14.
  • the marker fits just around the center opening 14b of the disc 14.
  • the marker is laminated into the disc during manufacture thereof. In this way the marker cannot be easily removed.
  • the marker may also have laminated thereunder or thereon, segments 16 of a relatively highcoercivity magnetic material which can be magnetized by an authorized person to desensitize the marker so that it will not produce responses upon being carried through a magnetic interrogation field.
  • Figs. 3 and 4 show alternative configurations of the marker of the present invention.
  • a marker 20 is formed of a closed loop band in the shape of a square while in Fig. 4 a marker 30 is formed of a closed loop band in the shape of a triangle.
  • the marker is provided with spaced apart cutouts 22 and 32.
  • Each of these cutouts form two thin strips of target material 20a and 20b and 30a and 30b, respectively, which are interspersed with segment 20c and 30c of full width material.
  • the different thin strips in each marker extend in different directions to minimize orientation sensitivity. It will be appreciated that other polygonal marker configurations may be used in accordance with the present invention.
  • narrowed regions could be formed by lateral cutouts, which are located on the inner or outer, or both the inner and outer sides of the band.

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)
  • Geophysics And Detection Of Objects (AREA)
  • Soft Magnetic Materials (AREA)
EP19940107232 1993-06-11 1994-05-09 Multirichtungsempfindliches Etikett für die Warenüberwachung Expired - Lifetime EP0628936B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US7624793A 1993-06-11 1993-06-11
US76247 1993-06-11

Publications (2)

Publication Number Publication Date
EP0628936A1 true EP0628936A1 (de) 1994-12-14
EP0628936B1 EP0628936B1 (de) 2000-03-01

Family

ID=22130821

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940107232 Expired - Lifetime EP0628936B1 (de) 1993-06-11 1994-05-09 Multirichtungsempfindliches Etikett für die Warenüberwachung

Country Status (5)

Country Link
EP (1) EP0628936B1 (de)
JP (1) JP2500309B2 (de)
AU (1) AU667431B2 (de)
BR (1) BR9402136A (de)
DE (2) DE69423135T2 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4440314A1 (de) * 1994-11-11 1996-05-15 Esselte Meto Int Gmbh Markierungselement zur Sicherung von Artikeln gegen Diebstahl
DE19604114A1 (de) * 1996-02-06 1997-08-07 Esselte Meto Int Gmbh Sicherungselement für die elektronische Artikelsicherung
WO1999035516A1 (en) * 1998-01-05 1999-07-15 Flying Null Limited Uni-directional magnetic tag
WO2000051092A1 (en) * 1999-02-26 2000-08-31 3M Innovative Properties Company Electronic article surveillance markers for optically recorded media
WO2003044754A1 (en) * 2001-11-15 2003-05-30 Metglas, Inc. Electronic article surveillance markers for recorded media
EP2081191A1 (de) 2008-01-21 2009-07-22 Tecnicas Pantra S.L. Nicht symmetrische Vorrichtung mit Alarm für CD-Platten und ähnlichen Artikeln

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5519379A (en) * 1995-04-10 1996-05-21 Sensormatic Electronics Corporation Multi-thread re-entrant marker with simultaneous switching
DE19738309A1 (de) * 1997-09-02 1999-03-04 Meto International Gmbh Vorrichtung zur Sicherung von Artikeln gegen Diebstahl, entsprechendes Herstellungsverfahren und Vorrichtung zur Durchführung des Verfahrens

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0260830A2 (de) * 1986-09-19 1988-03-23 Minnesota Mining And Manufacturing Company Magnetisches Etikett mit Schalter-Sektion für Verwendung in elektronischen Artikel-Überwachungssystemen
EP0260831A2 (de) * 1986-09-19 1988-03-23 Minnesota Mining And Manufacturing Company Zweistand-Artikelüberwachungsetikett, magnetisch mit einem Muster zu versehen
US4910625A (en) * 1988-10-11 1990-03-20 Eastman Kodak Company Article surveillance apparatus and systems for computer data disks
US4967184A (en) * 1989-09-19 1990-10-30 Eastman Kodak Company Computer disk with security protection
EP0412721A2 (de) * 1989-08-08 1991-02-13 Minnesota Mining And Manufacturing Company Magnetische Artikelüberwachungsmarkierung mit Ansprache in mehreren Richtungen, zwei Zuständen, und Dauerzustand

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US4825197A (en) * 1988-02-01 1989-04-25 Minnesota Mining And Manufacturing Company Dual status magnetic marker having magnetically biasable flux collectors for us in electronic article surveillance systems

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0260830A2 (de) * 1986-09-19 1988-03-23 Minnesota Mining And Manufacturing Company Magnetisches Etikett mit Schalter-Sektion für Verwendung in elektronischen Artikel-Überwachungssystemen
EP0260831A2 (de) * 1986-09-19 1988-03-23 Minnesota Mining And Manufacturing Company Zweistand-Artikelüberwachungsetikett, magnetisch mit einem Muster zu versehen
US4910625A (en) * 1988-10-11 1990-03-20 Eastman Kodak Company Article surveillance apparatus and systems for computer data disks
EP0412721A2 (de) * 1989-08-08 1991-02-13 Minnesota Mining And Manufacturing Company Magnetische Artikelüberwachungsmarkierung mit Ansprache in mehreren Richtungen, zwei Zuständen, und Dauerzustand
US4967184A (en) * 1989-09-19 1990-10-30 Eastman Kodak Company Computer disk with security protection

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"article surveillance apparatus and systems for computer data disks", RESEARCH DISCLOSURE, no. 304, August 1989 (1989-08-01), NEW YORK, US, pages 617 *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4440314A1 (de) * 1994-11-11 1996-05-15 Esselte Meto Int Gmbh Markierungselement zur Sicherung von Artikeln gegen Diebstahl
DE19604114A1 (de) * 1996-02-06 1997-08-07 Esselte Meto Int Gmbh Sicherungselement für die elektronische Artikelsicherung
WO1999035516A1 (en) * 1998-01-05 1999-07-15 Flying Null Limited Uni-directional magnetic tag
US6577237B1 (en) 1998-01-05 2003-06-10 Andrew Nicholas Dames Uni-directional magnetic tag
WO2000051092A1 (en) * 1999-02-26 2000-08-31 3M Innovative Properties Company Electronic article surveillance markers for optically recorded media
US6525661B2 (en) 1999-02-26 2003-02-25 3M Innovative Properties Company Electronic article surveillance markers for optically recorded media
AU774797B2 (en) * 1999-02-26 2004-07-08 3M Innovative Properties Company Electronic article surveillance markers for optically recorded media
WO2003044754A1 (en) * 2001-11-15 2003-05-30 Metglas, Inc. Electronic article surveillance markers for recorded media
US6693542B2 (en) 2001-11-15 2004-02-17 Ryusuke Hasegawa Electronic article surveillance markers for recorded media
EP2081191A1 (de) 2008-01-21 2009-07-22 Tecnicas Pantra S.L. Nicht symmetrische Vorrichtung mit Alarm für CD-Platten und ähnlichen Artikeln

Also Published As

Publication number Publication date
JP2500309B2 (ja) 1996-05-29
DE9407703U1 (de) 1994-09-01
EP0628936B1 (de) 2000-03-01
DE69423135T2 (de) 2000-09-28
JPH0798791A (ja) 1995-04-11
DE69423135D1 (de) 2000-04-06
BR9402136A (pt) 1995-01-17
AU6068394A (en) 1994-12-15
AU667431B2 (en) 1996-03-21

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