CA2109643A1 - Marqueur en couches minces a deux etats pour systeme de surveillance electronique d'articles - Google Patents

Marqueur en couches minces a deux etats pour systeme de surveillance electronique d'articles

Info

Publication number
CA2109643A1
CA2109643A1 CA 2109643 CA2109643A CA2109643A1 CA 2109643 A1 CA2109643 A1 CA 2109643A1 CA 2109643 CA2109643 CA 2109643 CA 2109643 A CA2109643 A CA 2109643A CA 2109643 A1 CA2109643 A1 CA 2109643A1
Authority
CA
Canada
Prior art keywords
thin
film
signal
blocking layer
magnetic
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
CA 2109643
Other languages
English (en)
Other versions
CA2109643C (fr
Inventor
Ching-Long Tsai
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 CA2109643A1 publication Critical patent/CA2109643A1/fr
Application granted granted Critical
Publication of CA2109643C publication Critical patent/CA2109643C/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
    • 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
    • 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
    • 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
    • G08B13/2442—Tag materials and material properties thereof, e.g. magnetic material details

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)
  • Thin Magnetic Films (AREA)
CA 2109643 1992-12-23 1993-11-22 Marqueur en couches minces a deux etats pour systeme de surveillance electronique d'articles Expired - Fee Related CA2109643C (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US99618292A 1992-12-23 1992-12-23
US07/996,182 1992-12-23

Publications (2)

Publication Number Publication Date
CA2109643A1 true CA2109643A1 (fr) 1994-06-24
CA2109643C CA2109643C (fr) 2002-03-26

Family

ID=25542596

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2109643 Expired - Fee Related CA2109643C (fr) 1992-12-23 1993-11-22 Marqueur en couches minces a deux etats pour systeme de surveillance electronique d'articles

Country Status (6)

Country Link
EP (1) EP0604293B1 (fr)
JP (1) JPH06231376A (fr)
AU (1) AU669014B2 (fr)
CA (1) CA2109643C (fr)
DE (1) DE69328819T2 (fr)
ES (1) ES2148211T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09180936A (ja) * 1995-12-27 1997-07-11 Unitika Ltd 磁気素子
CA2194045A1 (fr) * 1995-12-27 1997-06-28 Shuji Ueno Marqueur magnetique
US5699047A (en) * 1996-01-19 1997-12-16 Minnesota Mining And Manufacturing Co. Electronic article surveillance markers for direct application to optically recorded media
JPH09232142A (ja) * 1996-02-28 1997-09-05 Unitika Ltd 磁気素子及びその製造方法
JP2002334307A (ja) * 2001-05-08 2002-11-22 Nhk Spring Co Ltd 合成樹脂成形体

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2040343T3 (es) * 1987-06-08 1993-10-16 Esselte Meto International Gmbh Dispositivos magneticos.
US5368948A (en) * 1989-01-09 1994-11-29 Esselte Meto International Produktions Magnetic materials for security applications
GB8900398D0 (en) * 1989-01-09 1989-03-08 Scient Generics Ltd Magnetic materials
US5015993A (en) * 1989-06-29 1991-05-14 Pitney Bowes Inc. Ferromagnetic alloys with high nickel content and high permeability
US5083112A (en) * 1990-06-01 1992-01-21 Minnesota Mining And Manufacturing Company Multi-layer thin-film eas marker

Also Published As

Publication number Publication date
EP0604293A1 (fr) 1994-06-29
AU5180793A (en) 1994-07-07
DE69328819D1 (de) 2000-07-13
CA2109643C (fr) 2002-03-26
DE69328819T2 (de) 2000-12-28
EP0604293B1 (fr) 2000-06-07
ES2148211T3 (es) 2000-10-16
AU669014B2 (en) 1996-05-23
JPH06231376A (ja) 1994-08-19

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed