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61.发明授权
公开(公告)号：US5729200A
公开(公告)日：1998-03-17
申请号：US697629
申请日：1996-08-28
IPC分类号： G08B13/24 , H01F1/153 , G08B23/181
CPC分类号： G08B13/2408 , G08B13/2411 , G08B13/2434 , G08B13/2442
摘要： A material used to form a biasing element for a magnetomechanical EAS marker has a coercivity that is lower than the coercivity of biasing elements used in conventional magnetomechanical markers. The marker formed with the low coercivity material can be deactivated by applying an AC magnetic field at a level that is lower than is required for deactivation of conventional markers. The marker with the low coercivity bias element can also be deactivated when at a greater distance from a deactivation device than was previously practical.
摘要翻译： 用于形成用于磁电机械EAS标记的偏压元件的材料具有低于常规磁机械标记中使用的偏置元件的矫顽力的矫顽力。 用低矫顽力材料形成的标记可以通过施加低于常规标记失活所需的水平的交流磁场而失活。 当具有低矫顽力偏置元件的标记物可以在与去激活装置相比比以前更实际的距离处被去激活。
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公开(公告)号：US5218371A
公开(公告)日：1993-06-08
申请号：US567149
申请日：1990-08-14
CPC分类号： G06K7/10336 , G06K7/0008 , G06K7/10316 , H01Q21/29 , H01Q7/00
摘要： An antenna system comprises at least first and second antennas circumscribing a common center thereof at respective different distances from the common center, and circuitry for exciting the first antenna at a greater level than the second antenna, the excitation of the first and second antennas by such exciting circuitry being of respective opposite phasing. The excitation circuitry is operative to provide first fields adjacent the antenna system to a predetermined distance therefrom which are essentially controlled by the excitation of the first antenna and to provide for second fields beyond the predetermined distance which are of lesser strength than the first fields and are determined by both of the first and second antennas.
摘要翻译： 天线系统包括至少第一和第二天线，其围绕与公共中心分开不同距离的公共中心，以及用于以比第二天线更高的水平激励第一天线的电路，第一和第二天线的激发由第二天线 激励电路各自相反的定相。 激励电路可操作地提供与天线系统相邻的第一场距离其预定距离，其基本上由第一天线的激励控制，并提供超过预定距离的第二场，其比第一场强度小，强度比第一场强 由第一和第二天线两者确定。
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