G - Physics – 08 – B
Patent
G - Physics
08
B
G08B 13/24 (2006.01)
Patent
CA 2428597
An EAS activation/deactivation antenna in accordance with the invention comprises a core; a coil arrangement having at least two coils spirally wrapped about the core, the first coil having a first rotational direction and the second coil having a rotational direction counter to the first rotational direction; and, a current source operatively connected to the coil arrangement. In consequence of the inventive arrangement, a decaying or steady state, alternating or direct current supplied by a current source can excite the coil arrangement to produce a significant near magnetic field and a reduced far magnetic field, for activation or deactivation of EAS markers.
L'invention se rapporte à une antenne servant à activer et à désactiver un système électronique de surveillance d'articles. Ladite antenne comporte : un noyau ; un dispositif de bobines comportant au moins deux bobines enroulées en spirale autour du noyau, la première bobine ayant un premier sens de rotation, et la seconde bobine ayant un sens de rotation contraire à celui de la première bobine ; et une source de courant connectée de manière opérationnelle au dispositif de bobine. Selon l'invention, un courant alternatif ou continu, à intensité décroissante ou stable, produit par une source de courant, peut exciter le dispositif de bobines afin de créer un champ magnétique proche important, et un champ magnétique lointain réduit, afin que des marqueurs de système de surveillance électronique d'articles puissent être activés ou désactivés.
Easter Ronald B.
Ely Reuel A.
Sensormatic Electronics Llc
Sensormatic Electronics Corporation
Smart & Biggar
LandOfFree
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