GB1212504A - Theft detection system - Google Patents
Theft detection systemInfo
- 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
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.
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)
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 |
-
1966
- 1966-12-30 GB GB5827166A patent/GB1212504A/en not_active Expired
Cited By (6)
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 |