CA2047559C - Magnetically-coupled, two-resonant-circuit, frequency-division tag - Google Patents

Magnetically-coupled, two-resonant-circuit, frequency-division tag

Info

Publication number
CA2047559C
CA2047559C CA002047559A CA2047559A CA2047559C CA 2047559 C CA2047559 C CA 2047559C CA 002047559 A CA002047559 A CA 002047559A CA 2047559 A CA2047559 A CA 2047559A CA 2047559 C CA2047559 C CA 2047559C
Authority
CA
Canada
Prior art keywords
frequency
circuit
resonant
electromagnetic radiation
response
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
CA002047559A
Other languages
English (en)
French (fr)
Other versions
CA2047559A1 (en
Inventor
Fred Wade Herman
Ming Ren Lian
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.)
Security Tag Systems Inc
Original Assignee
Security Tag Systems Inc
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
Priority claimed from US07/562,475 external-priority patent/US5065137A/en
Priority claimed from US07/562,471 external-priority patent/US5065138A/en
Application filed by Security Tag Systems Inc filed Critical Security Tag Systems Inc
Publication of CA2047559A1 publication Critical patent/CA2047559A1/en
Application granted granted Critical
Publication of CA2047559C publication Critical patent/CA2047559C/en
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
    • G08B13/2414—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 inductive tags
    • G08B13/242—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
    • G08B13/2405—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
    • G08B13/2422—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 acoustic or microwave 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
    • G08B13/2405—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
    • G08B13/2422—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 acoustic or microwave tags
    • G08B13/2425—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
    • G08B13/2431—Tag circuit details
    • 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)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Burglar Alarm Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Filters And Equalizers (AREA)
  • General Induction Heating (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
  • Magnetic Treatment Devices (AREA)
  • Near-Field Transmission Systems (AREA)
  • Electronic Switches (AREA)
CA002047559A 1990-08-03 1991-07-22 Magnetically-coupled, two-resonant-circuit, frequency-division tag Expired - Fee Related CA2047559C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US07/562,475 1990-08-03
US07/562,475 US5065137A (en) 1990-08-03 1990-08-03 Magnetically-coupled, two-resonant-circuit, frequency-division tag
US07/562,471 US5065138A (en) 1990-08-03 1990-08-03 Magnetically-coupled two-resonant-circuit, frequency divider for presence-detection-system tag
US07/562,471 1990-08-03

Publications (2)

Publication Number Publication Date
CA2047559A1 CA2047559A1 (en) 1992-02-04
CA2047559C true CA2047559C (en) 1999-07-06

Family

ID=27072966

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002047559A Expired - Fee Related CA2047559C (en) 1990-08-03 1991-07-22 Magnetically-coupled, two-resonant-circuit, frequency-division tag

Country Status (8)

Country Link
EP (1) EP0469769B1 (de)
JP (1) JP3224564B2 (de)
AT (1) ATE152848T1 (de)
AU (1) AU635654B2 (de)
CA (1) CA2047559C (de)
DE (1) DE69125985T2 (de)
ES (1) ES2100934T3 (de)
NO (1) NO912997L (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5241298A (en) * 1992-03-18 1993-08-31 Security Tag Systems, Inc. Electrically-and-magnetically-coupled, batteryless, portable, frequency divider
SE508322C2 (sv) * 1994-02-07 1998-09-28 Leif Aasbrink Larmelement
GB9815118D0 (en) * 1998-07-14 1998-09-09 Clan Holdings Ltd Security tag
RU2229160C1 (ru) * 2002-10-01 2004-05-20 Шалыгин Александр Николаевич Идентификационная метка
US7199717B2 (en) * 2004-02-17 2007-04-03 Sensormatic Electronics Corporation Frequency-division marker for an electronic article surveillance system
US10380857B1 (en) * 2018-03-05 2019-08-13 Sensormatic Electronics, LLC Systems and methods for radio frequency identification enabled deactivation of acousto-magnetic ferrite based marker

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1604219A (en) * 1977-04-28 1981-12-02 Parmeko Ltd Detection systems
US4481428A (en) * 1981-05-19 1984-11-06 Security Tag Systems, Inc. Batteryless, portable, frequency divider useful as a transponder of electromagnetic radiation
NL8204802A (nl) * 1982-12-10 1984-07-02 Nedap Nv Detectieplaatje met niet-lineair circuit voor een detectiestelsel.
US4727360A (en) * 1985-09-13 1988-02-23 Security Tag Systems, Inc. Frequency-dividing transponder and use thereof in a presence detection system
US4670740A (en) * 1985-11-04 1987-06-02 Security Tag Systems, Inc. Portable, batteryless, frequency divider consisting of inductor and diode

Also Published As

Publication number Publication date
NO912997D0 (no) 1991-08-01
JP3224564B2 (ja) 2001-10-29
DE69125985D1 (de) 1997-06-12
AU635654B2 (en) 1993-03-25
ATE152848T1 (de) 1997-05-15
CA2047559A1 (en) 1992-02-04
DE69125985T2 (de) 1997-12-11
EP0469769A2 (de) 1992-02-05
AU8132591A (en) 1992-02-06
ES2100934T3 (es) 1997-07-01
NO912997L (no) 1992-02-04
JPH04233696A (ja) 1992-08-21
EP0469769B1 (de) 1997-05-07
EP0469769A3 (en) 1992-12-30

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Legal Events

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