CA2344709C - Appareil resensibilisateur a aimant a champ lointain utilise avec des systemes de surveillance d'articles - Google Patents

Appareil resensibilisateur a aimant a champ lointain utilise avec des systemes de surveillance d'articles Download PDF

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Publication number
CA2344709C
CA2344709C CA002344709A CA2344709A CA2344709C CA 2344709 C CA2344709 C CA 2344709C CA 002344709 A CA002344709 A CA 002344709A CA 2344709 A CA2344709 A CA 2344709A CA 2344709 C CA2344709 C CA 2344709C
Authority
CA
Canada
Prior art keywords
array
magnets
marker
working surface
magnet
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 - Fee Related
Application number
CA002344709A
Other languages
English (en)
Other versions
CA2344709A1 (fr
Inventor
Peter J. Zarembo
Erland K. Persson
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.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
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 Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Publication of CA2344709A1 publication Critical patent/CA2344709A1/fr
Application granted granted Critical
Publication of CA2344709C publication Critical patent/CA2344709C/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • 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
    • G08B13/2411—Tag deactivation

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

L'invention concerne un appareil de démagnétisation utilisé avec des systèmes électroniques de surveillance d'articles magnétiques dotés d'un marqueur antivol à double statut contenant au moins un élément de contrôle démagnétisable qui, une fois démagnétisé, permet la détection du marqueur opérée par le système lorsque le marqueur se trouve dans une zone d'interrogation. L'appareil est équipé d'un réseau d'aimants logés dans un boîtier présentant une succession de champs à polarité alternée et présentant au moins partiellement des intensités exponentiellement décroissantes le long d'une pluralité de chemins à des distances supérieures au niveau de la surface opérationnelle du boîtier le long de la partie du réseau d'aimants. Ce réseau d'aimants est configuré et disposé de sorte que le champ externe soit suffisant pour démagnétiser l'élément démagnétisable des marqueurs qui jalonnent les chemins à des distances différentes du réseau d'aimants.
CA002344709A 1998-10-13 1999-02-19 Appareil resensibilisateur a aimant a champ lointain utilise avec des systemes de surveillance d'articles Expired - Fee Related CA2344709C (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US17066798A 1998-10-13 1998-10-13
US09/170,667 1998-10-13
PCT/US1999/003635 WO2000022587A1 (fr) 1998-10-13 1999-02-19 Appareil resensibilisateur a aimant a champ lointain utilise avec des systemes de surveillance d'articles

Publications (2)

Publication Number Publication Date
CA2344709A1 CA2344709A1 (fr) 2000-04-20
CA2344709C true CA2344709C (fr) 2008-12-30

Family

ID=22620805

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002344709A Expired - Fee Related CA2344709C (fr) 1998-10-13 1999-02-19 Appareil resensibilisateur a aimant a champ lointain utilise avec des systemes de surveillance d'articles

Country Status (8)

Country Link
EP (1) EP1119833B1 (fr)
JP (1) JP2002527837A (fr)
KR (1) KR20010083887A (fr)
AU (1) AU2688299A (fr)
BR (1) BR9914407A (fr)
CA (1) CA2344709C (fr)
DE (1) DE69908392T2 (fr)
WO (1) WO2000022587A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20240008748A (ko) 2022-07-12 2024-01-19 엄태형 대피 기능을 갖는 발코니 난간
TWI904439B (zh) * 2023-05-26 2025-11-11 奇資訊保安及網絡有限公司 可消磁的磁性裝置以及對磁性儲存媒體進行消磁的方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4499444A (en) * 1983-05-20 1985-02-12 Minnesota Mining And Manufacturing Company Desensitizer for ferromagnetic markers used with electromagnetic article surveillance systems
US4689590A (en) * 1986-07-21 1987-08-25 Minnesota Mining And Manufacturing Company Demagnetization apparatus for magnetic markers used with electromagnetic article surveillance systems
US4752758A (en) * 1986-07-21 1988-06-21 Minnesota Mining And Manufacturing Company Demagnetization apparatus for magnetic markers used with article surveilliance systems
US5187462A (en) * 1990-02-15 1993-02-16 Minnesota Mining And Manufacturing Company Multiple magnet assembly for use with electromagnetic article surveillance markers
US5225807A (en) * 1991-09-16 1993-07-06 Knogo Corporation Method and apparatus for sensitizing and desensitizing targets for electronic article surveillance systems
US5285182A (en) * 1992-09-03 1994-02-08 Minnesota Mining And Manufacturing Company Desensitizing apparatus for electromagnetic article surveillance system
US5594420A (en) * 1995-02-02 1997-01-14 Sensormatic Electronics Corporation Rotating magnet array for deactivating EAS markers

Also Published As

Publication number Publication date
EP1119833B1 (fr) 2003-05-28
HK1039199A1 (en) 2002-04-12
DE69908392T2 (de) 2003-11-27
WO2000022587A1 (fr) 2000-04-20
AU2688299A (en) 2000-05-01
BR9914407A (pt) 2001-06-26
DE69908392D1 (de) 2003-07-03
KR20010083887A (ko) 2001-09-03
EP1119833A1 (fr) 2001-08-01
JP2002527837A (ja) 2002-08-27
CA2344709A1 (fr) 2000-04-20

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed