GB2476050B - Tag detector - Google Patents

Tag detector

Info

Publication number
GB2476050B
GB2476050B GB0921496A GB0921496A GB2476050B GB 2476050 B GB2476050 B GB 2476050B GB 0921496 A GB0921496 A GB 0921496A GB 0921496 A GB0921496 A GB 0921496A GB 2476050 B GB2476050 B GB 2476050B
Authority
GB
United Kingdom
Prior art keywords
tag
detector
signal
detection signal
bursts
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
GB0921496A
Other versions
GB2476050A (en
GB0921496D0 (en
Inventor
Paul Cox
Mervyn Lear
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.)
Redcliffe Magtronics Ltd
Original Assignee
Redcliffe Magtronics Ltd
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 Redcliffe Magtronics Ltd filed Critical Redcliffe Magtronics Ltd
Priority to GB0921496A priority Critical patent/GB2476050B/en
Priority to GB1309642.5A priority patent/GB2500134B/en
Publication of GB0921496D0 publication Critical patent/GB0921496D0/en
Publication of GB2476050A publication Critical patent/GB2476050A/en
Application granted granted Critical
Publication of GB2476050B publication Critical patent/GB2476050B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • G08B13/2422—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 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
    • 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
    • G08B13/2405—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 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
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468—Antenna in system and the related signal processing
    • G08B13/2471—Antenna signal processing by receiver or emitter
    • 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
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2488—Timing issues, e.g. synchronising measures to avoid signal collision, with multiple emitters or a single emitter and receiver

Landscapes

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

Abstract

An electronic article surveillance (EAS) tag detector comprises a signal generating circuit for generating a tag detection signal and an antenna arrangement for transmitting the tag detection signal. The tag detection signal comprises a group of at least three bursts, where the first and second bursts are separated by a first time interval and the second and third bursts are separated by a second time interval which is different from the first time interval. The detector may additionally comprise a detector circuit for receiving a reradiated signal from the tag, and comparing it to a reference. The system may further generate a tag deactivation signal for de-energizing a tag within the detection area. The format of the detection signal reduces interference between the tag detector and mains operated EAS equipment.
GB0921496A 2009-12-08 2009-12-08 Tag detector Expired - Fee Related GB2476050B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0921496A GB2476050B (en) 2009-12-08 2009-12-08 Tag detector
GB1309642.5A GB2500134B (en) 2009-12-08 2009-12-08 Hand-held tag detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0921496A GB2476050B (en) 2009-12-08 2009-12-08 Tag detector

Publications (3)

Publication Number Publication Date
GB0921496D0 GB0921496D0 (en) 2010-01-20
GB2476050A GB2476050A (en) 2011-06-15
GB2476050B true GB2476050B (en) 2013-11-13

Family

ID=41642123

Family Applications (2)

Application Number Title Priority Date Filing Date
GB0921496A Expired - Fee Related GB2476050B (en) 2009-12-08 2009-12-08 Tag detector
GB1309642.5A Expired - Fee Related GB2500134B (en) 2009-12-08 2009-12-08 Hand-held tag detector

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB1309642.5A Expired - Fee Related GB2500134B (en) 2009-12-08 2009-12-08 Hand-held tag detector

Country Status (1)

Country Link
GB (2) GB2476050B (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995012870A1 (en) * 1993-11-04 1995-05-11 Knogo Corporation Method and apparatus for automatically desensitizing sensor elements
EP0798681A1 (en) * 1996-03-29 1997-10-01 Sensormatic Electronics Corporation Pulsed interrogation signal in harmonic EAS system
WO2001013345A1 (en) * 1999-08-16 2001-02-22 Checkpoint Systems, Inc. Electronic article security system employing variable time shifts
WO2002101677A1 (en) * 2001-06-13 2002-12-19 3M Innovative Properties Company Field creation in a magnetic electronic article surveillance system
US20050275507A1 (en) * 2004-06-10 2005-12-15 Hall Stewart E Deactivator using resonant recharge
US20060273901A1 (en) * 2005-06-03 2006-12-07 Hall Stewart E Techniques for deactivating electronic article surveillance labels using energy recovery

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0287905B1 (en) * 1987-04-23 1993-03-03 Actron Entwicklungs AG Method for deactivating a resonant target, and circuit for carrying out this method
NL9002120A (en) * 1990-09-28 1992-04-16 Nedap Nv PULSE DEACTIVATOR.
US6111507A (en) * 1997-02-03 2000-08-29 Sensormatic Electronics Corporation Energizing circuit for EAS marker deactivation device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995012870A1 (en) * 1993-11-04 1995-05-11 Knogo Corporation Method and apparatus for automatically desensitizing sensor elements
EP0798681A1 (en) * 1996-03-29 1997-10-01 Sensormatic Electronics Corporation Pulsed interrogation signal in harmonic EAS system
WO2001013345A1 (en) * 1999-08-16 2001-02-22 Checkpoint Systems, Inc. Electronic article security system employing variable time shifts
WO2002101677A1 (en) * 2001-06-13 2002-12-19 3M Innovative Properties Company Field creation in a magnetic electronic article surveillance system
US20050275507A1 (en) * 2004-06-10 2005-12-15 Hall Stewart E Deactivator using resonant recharge
US20060273901A1 (en) * 2005-06-03 2006-12-07 Hall Stewart E Techniques for deactivating electronic article surveillance labels using energy recovery

Also Published As

Publication number Publication date
GB201309642D0 (en) 2013-07-17
GB2500134A (en) 2013-09-11
GB2476050A (en) 2011-06-15
GB0921496D0 (en) 2010-01-20
GB2500134B (en) 2014-02-12

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20161208