EP0388609B1 - Elektronische Diebstahlsicherungseinrichtung - Google Patents

Elektronische Diebstahlsicherungseinrichtung Download PDF

Info

Publication number
EP0388609B1
EP0388609B1 EP19900102051 EP90102051A EP0388609B1 EP 0388609 B1 EP0388609 B1 EP 0388609B1 EP 19900102051 EP19900102051 EP 19900102051 EP 90102051 A EP90102051 A EP 90102051A EP 0388609 B1 EP0388609 B1 EP 0388609B1
Authority
EP
European Patent Office
Prior art keywords
transmitters
transmitter
signals
receivers
frequency
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 - Lifetime
Application number
EP19900102051
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0388609A2 (de
EP0388609A3 (de
Inventor
Markus Martinides
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.)
Actron Entwicklungs AG
Original Assignee
Actron Entwicklungs AG
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 Actron Entwicklungs AG filed Critical Actron Entwicklungs AG
Publication of EP0388609A2 publication Critical patent/EP0388609A2/de
Publication of EP0388609A3 publication Critical patent/EP0388609A3/de
Application granted granted Critical
Publication of EP0388609B1 publication Critical patent/EP0388609B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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

Definitions

  • the present invention relates to an electronic anti-theft device with a plurality of mutually synchronized transmitter-receiver pairs, the transmitters generating an electromagnetic field, which excites the resonance circuit on a resonance label, which may be located in the reception area of the transmitter, and wherein the receivers on the Address signals from the transmitters and any resonance tag located in the reception area, evaluate these signals and trigger an alarm signal when a signal from the resonance tag is detected.
  • the object of the present invention is now to create a device of the type defined at the outset, which is able to eliminate the interfering influences.
  • a large number of transmitter-receiver pairs are set up in the system according to the invention (multiple systems).
  • the transmitter emits a sequence of pulses with only one frequency each, this frequency from pulse to pulse in a manner known per se is changed by a small amount compared to the frequency of the previous pulse. In this way, the transmitter can be swept in steps.
  • the resonance label is detected if the frequency steps are sufficiently small and the total of the "discrete" transmission frequencies defined in this way covers the resonance frequency of the label.
  • the receiver is also designed to be very narrow-band, the reception frequency being automatically matched to the transmission frequency and carried along with it.
  • the narrowband receiver offers the advantage of high interference suppression and low noise.
  • the individual transmitters are swept through with a frequency offset, i.e. all transmitters transmit at the same time and for the same length of time, but each transmitter on a frequency that is different from the frequency of every other transmitter, but in such a way that each transmitter during one Wobble cycle also sends once on each of the specified "discrete" wobble frequencies.
  • a transmitter that transmits at the maximum wobble frequency jumps back to the minimum transmission frequency during the subsequent transmission pulse.
  • each transmitter-receiver device functions in the presence of all other installations of the overall system as if it were a single system would be installed, ie as if all other installations were switched off. If a transmitter-receiver pair is optimally set in single operation, it remains optimal even during the simultaneous operation of all transmitter-receiver pairs in the entire system.
  • the individual transmitter-receiver pairs are synchronized by signals which are transmitted to them wirelessly from a central office or which they transmit directly to one another (e.g. via their transmitters and receivers, which are intended for resonance label detection).

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Burglar Alarm Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
EP19900102051 1989-03-22 1990-02-02 Elektronische Diebstahlsicherungseinrichtung Expired - Lifetime EP0388609B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH107889A CH681051A5 (enrdf_load_stackoverflow) 1989-03-22 1989-03-22
CH1078/89 1989-03-22

Publications (3)

Publication Number Publication Date
EP0388609A2 EP0388609A2 (de) 1990-09-26
EP0388609A3 EP0388609A3 (de) 1991-03-20
EP0388609B1 true EP0388609B1 (de) 1997-12-29

Family

ID=4201949

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900102051 Expired - Lifetime EP0388609B1 (de) 1989-03-22 1990-02-02 Elektronische Diebstahlsicherungseinrichtung

Country Status (4)

Country Link
EP (1) EP0388609B1 (enrdf_load_stackoverflow)
JP (1) JPH02284294A (enrdf_load_stackoverflow)
CH (1) CH681051A5 (enrdf_load_stackoverflow)
DE (1) DE59010785D1 (enrdf_load_stackoverflow)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3740742A (en) * 1971-05-11 1973-06-19 T Thompson Method and apparatus for actuating an electric circuit
US4215342A (en) * 1978-03-31 1980-07-29 Intex Inc. Merchandise tagging technique
US4476459A (en) * 1981-10-23 1984-10-09 Knogo Corporation Theft detection method and apparatus in which the decay of a resonant circuit is detected
NL8202951A (nl) * 1982-07-21 1984-02-16 Nedap Nv Absorptiedetectiestelsel.
US4531117A (en) * 1983-07-05 1985-07-23 Minnesota Mining And Manufacturing Company Variable frequency RF electronic surveillance system
US4667185A (en) * 1985-12-06 1987-05-19 Minnesota Mining And Manufacturing Company Wireless synchronization system for electronic article surveillance system

Also Published As

Publication number Publication date
DE59010785D1 (de) 1998-02-05
JPH02284294A (ja) 1990-11-21
EP0388609A2 (de) 1990-09-26
EP0388609A3 (de) 1991-03-20
CH681051A5 (enrdf_load_stackoverflow) 1992-12-31

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