Dual status magnetic marker having magnetically biasable...

Details Dual status magnetic marker having magnetically biasable... Dual status magnetic marker having magnetically biasable...

G - Physics

08

B

340/124.3

G08B 13/24 (2006.01)

Patent

CA 1301880

42492 CAN 4A Abstract A dual status marker as shown in Figure 8 for use in electronic article surveillance systems having an alternating magnetic field. The marker comprises a magnetic responder element having at least one central switching portion and flux collectors on each end thereof which concentrate flux within the switching portion to ensure that the flux density therein is sufficient to generate an appropriate response. The marker is made dual status by providing magnetizable keeper elements adjacent the flux collectors. When the keeper elements are magnetized, the associated field biases the flux collectors and inhibits magnetization reversal therein in response to an interrogation field, thereby preventing flux from the interrogation field from being concentrated in the switching portion of the responder element.

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