Dual status magnetic marker having magnetically biasable flux collectors for us in electronic article surveillance systems
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United States of America Patent
Stats
-
Apr 25, 1989
Grant Date -
N/A
app pub date -
Feb 1, 1988
filing date -
Feb 1, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dual status marker for use in electronic article surveillance systems having an alternating magnetic field. The marker comprises a magnetic responder element having a central switching portion and flux collectors on each end which concentrate flux within the switching portion to ensure that the flux density therein is sufficient to generate an approximate 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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Cited Art Landscape
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