公开(公告)号：EP1095359A1

公开(公告)日：2001-05-02

申请号：EP99933657.1

申请日：1999-07-02

申请人： Sensormatic Electronics Corporation

发明人： GADONNIEX, Dennis, M. ,  LIAN, Ming-Ren ,  LAMBETH, David, N. ,  O'HANDLEY, Robert, C. ,  HO, Wing, K.

IPC分类号： G08B13/14 ,  G08B13/24

CPC分类号： G08B13/2408 ,  G08B13/2434 ,  G08B13/2488

摘要： 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.

公开(公告)号：EP1103035B1

公开(公告)日：2009-09-09

申请号：EP99932172.2

申请日：1999-07-02

申请人： Sensormatic Electronics Corporation

发明人： ALICOT, Jorge, Fernando ,  NARLOW, Douglas, A. ,  COPELAND, Richard, L. ,  LAMBETH, David, N.

IPC分类号： G08B13/24

CPC分类号： G08B13/2411 ,  G08B13/2402 ,  G08B13/242

摘要： A device (10) for deactivating a magnetomechanical EAS marker includes two coils (24, 28, 26, 30) and an energizing circuit (32) for alternately driving the coils. One coil (24, 28) is driven for one cycle of an alternating power signal, and then the other coil (26, 30) is driven for one cycle, and this sequence is repeated. The driving signal (31) is switched from one coil to the other at a point in time which corresponds to a zero crossing of the current level of the driving signal.

公开(公告)号：EP1103035A1

公开(公告)日：2001-05-30

申请号：EP99932172.2

申请日：1999-07-02

申请人： Sensormatic Electronics Corporation

发明人： ALICOT, Jorge, Fernando ,  NARLOW, Douglas, A. ,  COPELAND, Richard, L. ,  LAMBETH, David, N.

IPC分类号： G08B13/14

CPC分类号： G08B13/2411 ,  G08B13/2402 ,  G08B13/242

摘要： A device (10) for deactivating a magnetomechanical EAS marker includes two coils (24, 28, 26, 30) and an energizing circuit (32) for alternately driving the coils. One coil (24, 28) is driven for one cycle of an alternating power signal, and then the other coil (26, 30) is driven for one cycle, and this sequence is repeated. The driving signal (31) is switched from one coil to the other at a point in time which corresponds to a zero crossing of the current level of the driving signal.