H - Electricity – 01 – F
Patent
H - Electricity
01
F
317/29, 352/53.4
H01F 13/00 (2006.01) G08B 13/24 (2006.01) G11B 23/023 (2006.01) H01F 7/02 (2006.01)
Patent
CA 1217526
ABSTRACT A desensitizer apparatus for use with magnetically based electronic article surveillance systems having a marker containing at least one magnetizable section which when magnetized, alters the response of the marker produced by an alternating magnetic field provided inn interrogation zone. The apparatus includes a magnet assembly having an elongated permanent magnet section and a pair of elongated pole pieces which concentrate external fields produced by the magnet sections near a gap extending the length of the magnet section, the external field near the gap being sufficient in intensity to magnetize the magnetizable section of a marker positioned proximate thereto, and being rapidly attenuated a short distance from the gap. Accordingly, magnetically sensitive articles such as prerecorded magnetic recording cassettes to which the markers are affixed are not affected.
452597
Heltemes Eugene C.
Montean Samuel
Minnesota Mining And Manufacturing Company
Smart & Biggar
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