Electricity: measuring and testing – Magnetic – Calibration
Patent
1994-10-28
1996-07-02
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Calibration
36457102, 324252, G01R 3502, G01R 3302, G01D 1800
Patent
active
055325840
ABSTRACT:
A magnetic assembly for detection and authentication of magnetic documents. The magnetic assembly includes a permanent magnet (PM), first and second magnetically soft high permeability pole pieces shaped to form a tapered, variable gap size magnetic circuit with the permanent magnet. The PM is located at a first gap between the first and second pole pieces. A magnetoresistive (MR) sensing element is located at or near the center of a second gap between said first and second pole pieces. The second gap and MR sensing element are proximate a magnetic document to be sensed. An electrical conductor is adjacent to the MR sensing element, but is electrically insulated therefrom.
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Freeman Jay D.
Gandola Kent R.
Jeffers Frederick J.
Koeppe Peter V.
Smith Neil
Eastman Kodak Company
Noval William F.
Phillips Roger
Snow Walter E.
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