Apparatus for testing documents having magnetic properties

Details Apparatus for testing documents having magnetic properties Apparatus for testing documents having magnetic properties

1992-12-16

1995-10-10

Snow, Walter E.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324262, 235449, 209569, G07D 700, G06K 708, G01N 2772, G01R 3312

Patent

active

054573823

ABSTRACT:
In an apparatus for testing test objects equipped with magnetic properties, the magnetic circuit with an air gap having a detector consists of at least a soft-magnetic material and a permanent-magnetic material, whereby the static magnetic field produced by the permanent-magnetic material penetrates the magnetic circuit. The air gap is preferably formed between an end of the soft-magnetic material and a pole of the permanent-magnetic material.

REFERENCES:
patent: 3060370 (1962-10-01), Varterasien
patent: 3875545 (1975-04-01), Curtiss
patent: 3972156 (1976-08-01), Bennett, Jr. et al.
patent: 4270088 (1981-05-01), Weischedel
patent: 4471303 (1984-09-01), Okubo

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