Stabilizing the position of an active element in a...

G - Physics – 08 – B

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

Patent

CA 2336603

A magnetomechanical EAS marker (20) is formed of a housing (22, 24), a magnetostrictive active element (12) in the housing and a bias element (not separately shown) fixedly mounted on the housing. A central portion of the active element is secured to the housing to keep the active element from shifting in a longitudinal direction relative to the bias element and to keep ends of the active element spaced from the housing. The active element remains free to mechanically resonate in response to an EAS interrogation signal. The stable positioning of the active element prevents variations in the bias magnetic field due to shifting relative to the bias element, while keeping ends of the active element free from frictional damping due to mechanical loading from contact with the housing.

L'invention concerne un marqueur magnétomécanique (20) EAS comprenant un logement (22, 24), un élément magnétorestrictif (12) actif situé dans ledit logement, et un élément de polarisation monté fixe sur le logement. Une partie centrale de l'élément actif est fixée au logement, de façon à empêcher un décalage de l'élément actif dans un sens longitudinal par rapport à l'élément de polarisation, et à maintenir éloignées du logement les extrémités de cet élément actif. Ledit élément actif peut résonner mécaniquement en réponse à un signal d'interrogation du EAS. Le positionnement stable de l'élément d'interrogation empêche des variations dans le champ magnétique de polarisation, du fait du décalage par rapport à l'élément de polarisation, tout maintenant les extrémités de l'élément actif exemptes d'amortissement par friction, provoqué par une charge mécanique provenant du contact avec le logement.

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