Apparatus for testing documents having magnetic properties
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United States of America Patent
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Oct 10, 1995
Issued Date -
N/A
app pub date -
Dec 16, 1992
filing date -
Jul 17, 1990
priority date (Note) -
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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.
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