ES2148211T3 - EAS MARKER (ELECTRONIC ARTICLE SURVEILLANCE) OF DOUBLE STATE THIN FILM. - Google Patents

EAS MARKER (ELECTRONIC ARTICLE SURVEILLANCE) OF DOUBLE STATE THIN FILM.

Info

Publication number
ES2148211T3
ES2148211T3 ES93403099T ES93403099T ES2148211T3 ES 2148211 T3 ES2148211 T3 ES 2148211T3 ES 93403099 T ES93403099 T ES 93403099T ES 93403099 T ES93403099 T ES 93403099T ES 2148211 T3 ES2148211 T3 ES 2148211T3
Authority
ES
Spain
Prior art keywords
fine
magnetizable
film
thin film
double state
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 - Lifetime
Application number
ES93403099T
Other languages
Spanish (es)
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
Application granted granted Critical
Publication of ES2148211T3 publication Critical patent/ES2148211T3/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • G08B13/2411—Tag deactivation
    • 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

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)

Abstract

UN MARCADOR DE ESTADO DOBLE PARA SU USO CON UN SISTEMA EAS DE TIPO MAGNETICO TIENE UNA CAPA PRODUCTORA DE SEÑAL QUE COMPRENDE AL MENOS UNA PELICULA FINA MAGNETICA DE GRAN PERMEABILIDAD Y UNA FUERZA COERCITIVA BAJA TAL COMO PERMAEACION, Y UNA CAPA DE BLOQUEO DE SEÑAL QUE COMPRENDE AL MENOS UNA PELICULA FINA REMANENTEMENTE MAGNETIZABLE TAL COMO UNA ALEACION FE-CR. LA PELICULA FINA REMANENTEMENTE MAGNETIZABLE DEBERIA TENER UN ESPESOR TOTAL AL MENOS IGUAL A, Y PREFERENTEMENTE AL MENOS DOS VECES, EL ESPESOR TOTAL DE LA PELICULA FINA MAGNETICA O PELICULAS FINAS DE GRAN PERMEABILIDAD. AL HACERLO ASI, EL MARCADOR SE DESACTIVA MAS FIABLEMENTE CUANDO LA CAPA DE BLOQUEO DE SEÑAL SE MAGNETIZA. PARA MAYOR SEGURIDAD DE DESACTIVACION LA CAPA DE BLOQUEO DE SEÑAL DEBERIA INCLUIR MAS DE UNA PELICULA FINA MAGNETIZABLE, DANDO ASI UN BUCLE B-H MAS CUADRADO Y MAYOR SEGURIDAD CONTRA LAS FALSAS ALARMAS.A DOUBLE STATE MARKER FOR USE WITH A MAGNETIC TYPE EAS SYSTEM HAS A SIGNAL PRODUCING LAYER WHICH INCLUDES AT LEAST A FINE MAGNETIC FILM OF HIGH PERMEABILITY AND A LOW COERCITIVE FORCE SIGNALING, AND A SIGNAL LOCKING LAYER. AT LEAST A FINE MOVIE THAT IS REMNANTLY MAGNETIZABLE SUCH AS A FE-CR ALLOY. THE REMAININGLY MAGNETIZABLE FINE FILM SHOULD HAVE A TOTAL THICKNESS AT LEAST EQUAL TO, AND PREFERABLY AT LEAST TWICE, THE TOTAL THICKNESS OF FINE MAGNETIC FILM OR FINE FILMS OF GREAT PERMEABILITY. BY DOING SO, THE MARKER DISABLES MORE RELIABLE WHEN THE SIGNAL LOCKING LAYER IS MAGNETIZED. FOR MORE SECURITY OF DEACTIVATION, THE SIGNAL LOCKING LAYER SHOULD INCLUDE MORE THAN ONE MAGNETIZABLE FINE FILM, PROVIDING A MORE SQUARE B-H LOOP AND MORE SECURITY AGAINST FALSE ALARMS.

ES93403099T 1992-12-23 1993-12-20 EAS MARKER (ELECTRONIC ARTICLE SURVEILLANCE) OF DOUBLE STATE THIN FILM. Expired - Lifetime ES2148211T3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US99618292A 1992-12-23 1992-12-23

Publications (1)

Publication Number Publication Date
ES2148211T3 true ES2148211T3 (en) 2000-10-16

Family

ID=25542596

Family Applications (1)

Application Number Title Priority Date Filing Date
ES93403099T Expired - Lifetime ES2148211T3 (en) 1992-12-23 1993-12-20 EAS MARKER (ELECTRONIC ARTICLE SURVEILLANCE) OF DOUBLE STATE THIN FILM.

Country Status (6)

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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09180936A (en) * 1995-12-27 1997-07-11 Unitika Ltd Magnetic element
EP0782013A3 (en) * 1995-12-27 1998-08-12 Unitika Ltd. Magnetic marker
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 (en) * 1996-02-28 1997-09-05 Unitika Ltd Magnetic device and manufacture thereof
JP2002334307A (en) * 2001-05-08 2002-11-22 Nhk Spring Co Ltd Synthetic resin molding

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3880202T2 (en) * 1987-06-08 1993-08-05 Esselte Meto Int Gmbh MAGNETIC DEVICES.
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
DE69328819T2 (en) 2000-12-28
EP0604293B1 (en) 2000-06-07
DE69328819D1 (en) 2000-07-13
AU669014B2 (en) 1996-05-23
CA2109643A1 (en) 1994-06-24
JPH06231376A (en) 1994-08-19
AU5180793A (en) 1994-07-07
CA2109643C (en) 2002-03-26
EP0604293A1 (en) 1994-06-29

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