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    • 3. 发明授权
    • Apparatus for changing the status of magnetic markers in an electronic
article surveillance system
    • 用于改变电子物品监视系统中磁标记状态的装置
    • US5625339A
    • 1997-04-29
    • US583925
    • 1996-01-11
    • Peter J. ZaremboPhilip E. EdstromAnthony M. BelkaDennis L. SandoWilliam R. Weber, IIIMark R. Crellin
    • Peter J. ZaremboPhilip E. EdstromAnthony M. BelkaDennis L. SandoWilliam R. Weber, IIIMark R. Crellin
    • G08B13/24G08B13/187H01F13/00
    • G08B13/2411G08B13/248
    • The present re/desensitizer is an apparatus for changing the status of a magnetic marker of an electronic article surveillance system. The markers are attached to or otherwise associated with an object to be protected, such has a book, CD, etc. The device can be set up as a resensitizer, a desensitizer, or with the inclusion of a mode switch, a combination re/desensitizer. The apparatus includes a magnetic field generator for generating a marker status changing magnetic field, detection means for detecting presence of an object, a control means for controlling the activation time of the magnetic field generator such that the marker status changing magnetic field is generated when an object is present. The magnetic field generator includes an offset core designed for continuous operation without excessive heat build up. The offset core is oriented such that the marker status changing magnetic field is substantially horizontal and adjacent to the mounting surface, thus reducing the complexity of movement of the hands and arms required when operating the device. The re/desensitizer also includes a control circuit which controls power to the magnetic field generator such that the marker status changing magnetic field is produced only when an object containing a marker is present. The control circuit also controls the duty cycle of the device by controlling the amount of time that the device is activated and by controlling the amount of time between successive activations.
    • 本发明的脱敏剂是用于改变电子物品监视系统的磁性标记的状态的装置。 标记被附接到或者与要保护的对象相关联,例如具有书籍,CD等。该装置可以被设置为复敏剂,脱敏剂,或者包括模式开关,组合重新/ 脱敏剂 该装置包括用于产生标记状态改变磁场的磁场发生器,用于检测物体的存在的检测装置,用于控制磁场发生器的激活时间的控制装置,以便在当发生标记状态改变磁场时 对象存在。 磁场发生器包括设计用于连续操作而没有过多的热积聚的偏移芯。 偏置芯取向为使得标记状态改变磁场基本上水平并且与安装表面相邻,从而降低了在操作设备时所需的手和手臂的移动的复杂性。 再减敏剂还包括控制电路,其控制对磁场发生器的电力,使得仅当存在包含标记物的物体时才产生标记状态改变磁场。 控制电路还通过控制设备激活的时间量并通过控制连续激活之间的时间量来控制设备的占空比。