Magnetomechanical eas marker with reduced-size bias magnet

Details Magnetomechanical eas marker with reduced-size bias magnet Magnetomechanical eas marker with reduced-size bias magnet

G - Physics

08

B

G08B 13/24 (2006.01)

Patent

CA 2337010

A magnetomechanical EAS marker (20) includes a housing (22), a magnetostrictive active element (26) in the housing, and a bias magnet (56) mounted on the housing adjacent to the active element (26). Both the active element (26) and the bias magnet (56) are substantially planar metal strips. The length and/or surface area of the bias magnet (56) is substantially less than the length and/or surface area of the active element (26). The reduction in the size of the bias magnet (56) relative to the active element (26) enhances reliable deactivation of the marker by increasing the resonant frequency shift obtained by degaussing the bias magnet. The increased reliability of deactivation is obtained without increasing the sensitivity of the marker, when in an active state, to variations in applied bias magnetic field.

L'invention porte sur un marqueur magnétomécanique (20) de surveillance d'articles comportant: un boîtier (22), un élément magnétostrictif (26) actif placé dans le boîtier, et un aimant de polarisation (56) monté dans le boîtier à côté de l'élément actif (26). L'élément actif (26) et l'aimant de polarisation (56) consistent tous deux en bandes métalliques sensiblement planes. La longueur et/ou la surface de l'aimant de polarisation (56) sont sensiblement inférieure à celles de l'élément actif (26). La réduction de la taille de l'aimant de polarisation (56) par rapport à celle de l'élément actif (26) permet de désactiver fiablement le marqueur en augmentant le décalage de la fréquence de résonance obtenu par démagnétisation de l'aimant de polarisation. L'accroissement de fiabilité de la désactivation s'obtient sans augmentation de la sensibilité du marqueur en fonctionnement aux variations du champ magnétique appliqué.

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