Magnetomechanical eas marker with abrupt bias

G - Physics – 08 – B

Patent

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G08B 13/24 (2006.01)

Patent

CA 2281797

A material used to form a biasing element (16) for a magnetomechanical EAS marker (10) has a coercivity that is lower than that of biasing elements used in conventional magnetomechanical markers. The marker (10) formed with the low coercivity material can be deactivated by applying an AC magnetic field at a level that is lower than is required for deactivating conventional markers. The marker (10) with the low coercivity bias element (16) can also be deactivated when at a greater distance from a de-activation device than was previously practical.

La présente invention concerne un matériau utilisé pour fabriquer un élément de polarisation d'étiquette de surveillance (10) magnétomécanique d'articles et présentant une coercitivité inférieure à celle des éléments de polarisation utilisés pour les étiquettes magnétomécaniques conventionnelles. L'étiquette (10) faite avec ce matériau à faible coercitivité peut être neutralisée en appliquant un champ magnétique de courant alternatif à un niveau inférieur à ce qui est nécessaire pour la neutralisation des étiquettes conventionnelles. Cette étiquette (10) dont l'élément de polarisation (16) est à faible coercitivité peut également se neutraliser à une plus grande distance du neutralisateur que ce qui se faisait jusqu'alors.

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