GB1212504A - Theft detection system - Google Patents

Theft detection system

Info

Publication number
GB1212504A
GB1212504A GB5827166A GB5827166A GB1212504A GB 1212504 A GB1212504 A GB 1212504A GB 5827166 A GB5827166 A GB 5827166A GB 5827166 A GB5827166 A GB 5827166A GB 1212504 A GB1212504 A GB 1212504A
Authority
GB
United Kingdom
Prior art keywords
oscillator
signal
oscillators
diode
alarm
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
GB5827166A
Inventor
Stephen Alexander Horchler
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.)
EURONICS Ltd
Original Assignee
EURONICS 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 EURONICS Ltd filed Critical EURONICS Ltd
Priority to GB5827166A priority Critical patent/GB1212504A/en
Publication of GB1212504A publication Critical patent/GB1212504A/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
    • G08B13/2422—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
    • G08B13/2428—Tag details
    • G08B13/2431—Tag circuit details

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)
  • Burglar Alarm Systems (AREA)

Abstract

1,212,504. Inductive signalling; transponders. EURONICS Ltd. 29 March, 1968 [30 Dec., 1966], No. 58271/66. Headings H4L and H4U. A system for detecting the unauthorized removal of articles through an exit, comprises a transmitter generating an inductive field across or adjacent to the exit and a plurality of miniaturized oscillators, one oscillator being attached to each article. As described, the oscillators are energized by rectification of the signal from the transmitter and retransmit a signal on a different frequency from that received to one or more receivers coupled to an alarm system. The oscillators themselves may include an audible alarm. One transistor oscillator described includes an energizing circuit tuned to one frequency and retransmits on a different frequency, the incoming signal being rectified by a diode. In a further embodiment, the oscillator consists of a resonant circuit comprising an inductor, a capacitor and a diode in series, the diode generating harmonics, one of which is utilized as the alarm signal. The oscillator may be included in a price tag label.
GB5827166A 1966-12-30 1966-12-30 Theft detection system Expired GB1212504A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5827166A GB1212504A (en) 1966-12-30 1966-12-30 Theft detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5827166A GB1212504A (en) 1966-12-30 1966-12-30 Theft detection system

Publications (1)

Publication Number Publication Date
GB1212504A true GB1212504A (en) 1970-11-18

Family

ID=10481187

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5827166A Expired GB1212504A (en) 1966-12-30 1966-12-30 Theft detection system

Country Status (1)

Country Link
GB (1) GB1212504A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0003178A1 (en) * 1978-01-11 1979-07-25 Philips Electronics Uk Limited Presence sensing system
EP0066403A1 (en) * 1981-05-19 1982-12-08 Automated Security (Holdings) PLC Batteryless, portable, frequency divider
US4575624A (en) * 1982-12-01 1986-03-11 Rheinmetall Gmbh Arrangement for activating and/or deactivating a marker strip having a magnetizable layer
EP0355355A2 (en) * 1988-08-25 1990-02-28 Symbol Technologies, Inc. Portable scanning system including a surveillance tag deactivator

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0003178A1 (en) * 1978-01-11 1979-07-25 Philips Electronics Uk Limited Presence sensing system
EP0066403A1 (en) * 1981-05-19 1982-12-08 Automated Security (Holdings) PLC Batteryless, portable, frequency divider
US4481428A (en) * 1981-05-19 1984-11-06 Security Tag Systems, Inc. Batteryless, portable, frequency divider useful as a transponder of electromagnetic radiation
US4575624A (en) * 1982-12-01 1986-03-11 Rheinmetall Gmbh Arrangement for activating and/or deactivating a marker strip having a magnetizable layer
EP0355355A2 (en) * 1988-08-25 1990-02-28 Symbol Technologies, Inc. Portable scanning system including a surveillance tag deactivator
EP0355355A3 (en) * 1988-08-25 1990-12-19 Symbol Technologies, Inc. Portable scanning system including a surveillance tag deactivator

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees