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1. WO1997026631 - PULSED-SIGNAL MAGNETOMECHANICAL ELECTRONIC ARTICLE SURVEILLANCE SYSTEM WITH IMPROVED DAMPING OF TRANSMITTING ANTENNA

Publication Number WO/1997/026631
Publication Date 24.07.1997
International Application No. PCT/US1997/000365
International Filing Date 15.01.1997
Chapter 2 Demand Filed 13.08.1997
IPC
G08B 13/24 2006.01
GPHYSICS
08SIGNALLING
BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
13Burglar, theft or intruder alarms
22Electrical actuation
24by interference with electromagnetic field distribution
CPC
G08B 13/2431
GPHYSICS
08SIGNALLING
BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
13Burglar, theft or intruder alarms
22Electrical actuation
24by interference with electromagnetic field distribution
2402Electronic 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
2428Tag details
2431Tag circuit details
G08B 13/2471
GPHYSICS
08SIGNALLING
BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
13Burglar, theft or intruder alarms
22Electrical actuation
24by interference with electromagnetic field distribution
2402Electronic 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
2465Aspects related to the EAS system, e.g. system components other than tags
2468Antenna in system and the related signal processing
2471Antenna signal processing by receiver or emitter
G08B 13/2488
GPHYSICS
08SIGNALLING
BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
13Burglar, theft or intruder alarms
22Electrical actuation
24by interference with electromagnetic field distribution
2402Electronic 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
2465Aspects related to the EAS system, e.g. system components other than tags
2488Timing issues, e.g. synchronising measures to avoid signal collision, with multiple emitters or a single emitter and receiver
Applicants
  • SENSORMATIC ELECTRONICS CORPORATION [US]/[US]
Inventors
  • HERRING, Richard, L.
Agents
  • TORRENTE, John, J.
Priority Data
08/585,49816.01.1996US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) PULSED-SIGNAL MAGNETOMECHANICAL ELECTRONIC ARTICLE SURVEILLANCE SYSTEM WITH IMPROVED DAMPING OF TRANSMITTING ANTENNA
(FR) SYSTEME ELECTRONIQUE MAGNETOMECANIQUE A SIGNAL PULSE DE SURVEILLANCE D'ARTICLES PRESENTANT UN MEILLEUR AMORTISSEMENT DE L'ANTENNE D'EMISSION
Abstract
(EN)
In a pulsed-signal magnetomechanical electronic article surveillance system, a single transmit circuit (16) is used to drive two or more parallel-connected interrogation signal transmitting antennas (18-1, 18-2). One or more switchable damping circuits (34-1, 34-2) are provided in series with the antennas to promote rapid damping of the interrogation signal at the end of each signal pulse. The damping circuit(s) are situated to provide damping in the loop(s) formed by the parallel connected antennas. Each switchable damping circuit is formed of a resistance (38) connected between a respective antenna and a terminal (36-1, 36-2) of the transmit circuit, as well as a switching element (40) connected across the resistance. The switching element is maintained in a conducting condition during each signal pulse and is open-circuited at the end of each pulse to bring the resistance into effective damping connection with the transmit antennas.
(FR)
Dans un système électronique magnétomécanique à signal pulsé de surveillance d'articles, on utilise un seul circuit de transmission pour entraîner au moins deux antennes de transmission de signaux d'interrogation connectées en parallèle (18-1, 18-2). Un ou plusieurs circuits d'amortissement commutables (34-1, 34-2), fournis en série avec les antennes, servent à assurer un amortissement rapide du signal d'interrogation à la fin de chaque impulsion de signal. Le (les) circuit(s) d'amortissement est (sont) situé(s) de façon à assurer l'amortissement dans la (les) boucle(s) formée(s) par les antennes connectées en parallèle. Chaque circuit d'amortissement commutable est constitué d'une résistance (38) connectée entre l'antenne correspondante et un terminal (36-1, 36-2) du circuit de transmission, ainsi que d'un élément de commutation (40) connecté aux bornes de la résistance. L'élément de commutation est maintenu en état de conduction pendant chaque pulsation de signal et se trouve à circuit ouvert à la fin de chaque pulsation, de sorte que la résistance est en connexion d'amortissement réelle avec les antennes de transmission.
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