GB1570877A - Identification system - Google Patents

Identification system Download PDF

Info

Publication number
GB1570877A
GB1570877A GB46656/76A GB4665676A GB1570877A GB 1570877 A GB1570877 A GB 1570877A GB 46656/76 A GB46656/76 A GB 46656/76A GB 4665676 A GB4665676 A GB 4665676A GB 1570877 A GB1570877 A GB 1570877A
Authority
GB
United Kingdom
Prior art keywords
tag
frequency
circuit
resonant circuit
coil
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
Application number
GB46656/76A
Other languages
English (en)
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.)
Nederlandsche Apparatenfabriek NEDAP NV
Original Assignee
Nederlandsche Apparatenfabriek NEDAP NV
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 Nederlandsche Apparatenfabriek NEDAP NV filed Critical Nederlandsche Apparatenfabriek NEDAP NV
Publication of GB1570877A publication Critical patent/GB1570877A/en
Expired 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
    • G08B13/2414—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
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/08—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
    • G06K7/082—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors
    • G06K7/083—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors inductive
    • G06K7/086—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors inductive sensing passive circuit, e.g. resonant circuit transponders
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/20—Individual registration on entry or exit involving the use of a pass
    • G07C9/28—Individual registration on entry or exit involving the use of a pass the pass enabling tracking or indicating presence
    • 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)
  • General Physics & Mathematics (AREA)
  • Computer Security & Cryptography (AREA)
  • Automation & Control Theory (AREA)
  • Electromagnetism (AREA)
  • Signal Processing (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Theoretical Computer Science (AREA)
  • Burglar Alarm Systems (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Near-Field Transmission Systems (AREA)
GB46656/76A 1975-11-14 1976-11-09 Identification system Expired GB1570877A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7513348A NL7513348A (nl) 1975-11-14 1975-11-14 Identificatiestelsel.

Publications (1)

Publication Number Publication Date
GB1570877A true GB1570877A (en) 1980-07-09

Family

ID=19824857

Family Applications (1)

Application Number Title Priority Date Filing Date
GB46656/76A Expired GB1570877A (en) 1975-11-14 1976-11-09 Identification system

Country Status (7)

Country Link
BE (1) BE848241A (enExample)
DE (1) DE2651042A1 (enExample)
ES (1) ES453283A1 (enExample)
FR (1) FR2331849A1 (enExample)
GB (1) GB1570877A (enExample)
IT (1) IT1069330B (enExample)
NL (1) NL7513348A (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0100128A1 (en) * 1982-07-21 1984-02-08 N.V. Nederlandsche Apparatenfabriek NEDAP Absorption detection system
GB2209258A (en) * 1987-08-31 1989-05-04 Monarch Marking Systems Inc Electronic article surveillance system utilizing synchronous integration

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7708012A (nl) * 1977-07-19 1979-01-23 Nedap Nv Detectiestelsel.
US4802080A (en) * 1988-03-18 1989-01-31 American Telephone And Telegraph Company, At&T Information Systems Power transfer circuit including a sympathetic resonator
GB9017910D0 (en) * 1990-08-15 1990-09-26 Vaseal Electronics Limited Improvements in and relating to proximity switches
DE4431446C2 (de) * 1994-09-03 1996-10-17 Norbert H L Dr Ing Koster Transponder-Antennenvorrichtung
DE19518228C2 (de) * 1995-05-12 2001-08-09 Whd Elektron Prueftech Gmbh Verfahren, Anordnungen, Vorrichtungen und Prüfzonen von zu prüfenden Objekten zur Echtheitsprüfung sowie Anwendung derselben
US5783871A (en) * 1996-09-24 1998-07-21 Trw Inc. Apparatus and method for sensing a rearward facing child seat
DE19729299A1 (de) * 1997-07-09 1999-01-14 Michael Flor Sicherungsvorrichtung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0100128A1 (en) * 1982-07-21 1984-02-08 N.V. Nederlandsche Apparatenfabriek NEDAP Absorption detection system
US4686517A (en) * 1982-07-21 1987-08-11 N.V. Nederlandsche Apparatenfabriek Nedap Field disturbance detection system
GB2209258A (en) * 1987-08-31 1989-05-04 Monarch Marking Systems Inc Electronic article surveillance system utilizing synchronous integration
GB2209258B (en) * 1987-08-31 1991-07-10 Monarch Marking Systems Inc Improvements relating to detectors for electronic article surveillance system

Also Published As

Publication number Publication date
ES453283A1 (es) 1978-02-01
BE848241A (nl) 1977-05-12
NL7513348A (nl) 1977-05-17
IT1069330B (it) 1985-03-25
DE2651042A1 (de) 1977-07-07
FR2331849A1 (fr) 1977-06-10
FR2331849B3 (enExample) 1979-07-27

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Legal Events

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