Redistributing magnetic charge in bias element for...

Details Redistributing magnetic charge in bias element for... Redistributing magnetic charge in bias element for...

G - Physics

08

B

G08B 13/24 (2006.01) H01F 13/00 (2006.01) H01L 41/12 (2006.01) H01L 41/22 (2006.01)

Patent

CA 2319334

A bias element (10) for use in a magnetomechanical EAS marker is magnetized to saturation (14). Then the magnetic charge in the bias element is redistributed (16) by applying to the bias element a magnetic field having an AC ringdown characteristic. The redistribution of magnetic charge improves the stability of the bias element, so that the marker incorporating the bias element is less likely to have its resonant frequency shifted by exposure to a stray magnetic field.

L'invention porte sur un élément (10) de polarisation destiné à être utilisé dans un marqueur magnétomécanique de systèmes électroniques de surveillance d'articles qui est magnétisé jusqu'à saturation (14). La charge magnétique de l'élément de polarisation est ensuite redistribuée (16) par application, sur l'élément de polarisation, d'un champ magnétique ayant une caractéristique de signalisation manuelle par le courant alternatif. La redistribution de la charge magnétique renforce la stabilité de l'élément de polarisation de sorte que la fréquence de résonance du marqueur renfermant l'élément de polarisation ait peu de chances d'être déplacée par exposition à un champ magnétique parasite.

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