G - Physics
07
D
G07D 7/04 (2006.01) G01V 3/10 (2006.01) G06K 7/08 (2006.01) G07D 5/08 (2006.01)
Patent
CA 2230523
The present invention relates to an induction head for sensing a magnetic strip or other magnetically permeable security structures. The induction head includes an exciting coil associated with an electrically conductive concentrator, which produces a primary field and induces a responsive secondary field in the concentrator. The concentrator has an endwall and sidewalls defining a central cavity. The endwall has a narrow measuring gap dividing the endwall into two opposed sections. The sidewalls are also interrupted adjacent the measuring gap to cause a concentrated current of the secondary field to pass along the gap. This concentrated current can be monitored for a change in induction due to the presence of an elongate magnetic strip or other magnetically permeable security structure which is moved past the measuring gap.
Cashcode Company Inc.
Crane Canada Co.
Dennison Associates
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