Permanent magnet assembly with MR element for detection/authenti

Details Permanent magnet assembly with MR element for detection/authenti Permanent magnet assembly with MR element for detection/authenti

1994-10-28

1996-09-03

Hajec, Donald T.

Registers

Coded record sensors

Particular sensor structure

324235, 324252, 360113, G06K 708

Patent

active

055525890

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.

REFERENCES:
patent: 3519899 (1967-07-01), Yamuda
patent: 3796859 (1974-03-01), Thompson
patent: 3896292 (1975-07-01), May et al.
patent: 4122505 (1978-10-01), Kuijk
patent: 4300177 (1981-11-01), Koel et al.
patent: 4400752 (1983-10-01), Chabrolle
patent: 4984226 (1991-01-01), Kobori
patent: 4987508 (1991-01-01), Smith
patent: 5021909 (1991-06-01), Shiiba
patent: 5418458 (1995-05-01), Jeffers

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