Field creation in a magnetic electronic article surveillance...

G - Physics – 08 – B

Patent

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G08B 13/24 (2006.01)

Patent

CA 2448443

In general, the invention is directed to techniques for creating and controlling a magnetic field for use with electronic article surveillance (EAS) markers. In particular, the techniques make use of current switching devices to generate a signal having one or more current pulses for creating the magnetic field. An electronic article surveillance (EAS) system includes a coil to create a magnetic field for changing a status of an EAS marker and a drive unit to output a signal having one or more current pulses for energizing the coil. A programmable processor within the EAS system controls the drive unit to generate the output signal according to a desired profile. By selectively activating and deactivating current switching devices within the drive unit, the processor can direct the drive unit to generate the output signal according to a desired profile having a number of current pulses of different amplitudes and direction.

L'invention concerne de manière générale des techniques permettant de produire et de régler un champ magnétique s'utilisant avec des marqueurs de surveillance électronique d'articles (EAS). Ces techniques utilisent en particulier des dispositifs de commutation de courant pour produire un signal comportant une ou plusieurs impulsions de courant permettant de former un champ magnétique. Un système d'EAS comprend une bobine destinée à produire un champ magnétique pour modifier l'état d'un marqueur d'EAS, et une unité de commande pour produire un signal comportant une ou plusieurs impulsions de courant destinées à exciter la bobine. Un processeur programmable situé dans le système d'EAS actionne l'unité de commande afin de produire un signal de sortie de profil voulu. En activant et en désactivant de manière sélective les dispositifs de commutation de courant dans l'unité de commande, le processeur fait produire par cette unité un signal de sortie de profil voulu, qui présente des impulsions de courant de différentes amplitudes et directions.

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