Eas marker with flux concentrators oriented transversely to...

Details Eas marker with flux concentrators oriented transversely to... Eas marker with flux concentrators oriented transversely to...

G - Physics

08

B

G08B 13/14 (2006.01) G08B 13/24 (2006.01)

Patent

CA 2318213

A harmonic-type electronic article surveillance marker (20) includes a thin, elongated active element (21) and flux concentrators (22, 23) provided at the ends (24, 25) of the active element. The flux concentrators (22, 23) have magnetic anisotropies that are oriented perpendicular to the length of the active element (21). The orientation of the magnetic anisotropies in the anisotropy field of the flux concentrators (22, 23) stabilizes the switching threshold of the active element (21). The switching threshold level can be controlled by varying parameters such as the angle of the magnetic anisotropies relative to the length of the active element (21), the strength of the anisotropy field of the magnetic anisotropies, and the geometry of the active element and the flux concentrators (22, 23).

L'invention concerne un marqueur (20) électronique de surveillance des articles de type harmonique qui comprend un élément (21) actif allongé mince et des concentrateurs (22, 23) de flux disposés aux extrémités (24, 25) de l'élément actif. Les concentrateurs (22, 23) de flux ont des anisotropies magnétiques qui sont orientées de manière perpendiculaire à la longueur de l'élément actif (21). L'orientation des anisotropies magnétiques dans le champ anisotrope des concentrateurs (22, 23) de flux stabilise le seuil de commutation de l'élément actif (21). Le niveau de ce seuil peut être contrôlé par une variation de paramètres tels que l'angle des anisotropies magnétiques par rapport à la longueur de l'élément actif (21), l'intensité du champ anisotrope des anisotropies magnétiques et la géométrie pour l'élément actif et les concentrateurs (22, 23) de flux.

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