Stabilizing the position of an active element in a magnetomechan

Details Stabilizing the position of an active element in a magnetomechan Stabilizing the position of an active element in a magnetomechan

1998-07-06

1999-10-19

Lee, Benjamin C.

Communications: electrical

Condition responsive indicating system

Specific condition

3405721, 3405723, 3405728, 340571, G08B 1314

Patent

active

059696125

ABSTRACT:
A magnetomechanical EAS marker is formed of a housing, a magnetostrictive active element in the housing and a bias element 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.

REFERENCES:
patent: 4510489 (1985-04-01), Anderson, III et al.
patent: 5499015 (1996-03-01), Winkler et al.
patent: 5565847 (1996-10-01), Gambino et al.
patent: 5745039 (1998-04-01), Hof et al.
patent: 5812065 (1998-09-01), Schrott et al.

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