Method and apparatus for producing complex magnetization pattern

Details Method and apparatus for producing complex magnetization pattern Method and apparatus for producing complex magnetization pattern

1990-09-04

1991-11-05

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

For magnetizing or demagnetizing

340551, 340572, 335303, H01F 720, H01F 1300, G08B 1324, G08B 1314

Patent

active

050633678

ABSTRACT:
A method and apparatus for producing complex magnetization patterns in a sheet of magnetic material. A fixture having top and bottom plates with a matching conductor pattern embedded in one surface of each plate. The conductor pattern covers substantially the entire surface of each plate. To magnetize the sheet of magnetic material, it is placed between the plates and a magnetizing current is applied to the conductors with a capacitor discharge magnetizer. The resulting sheet of magnetized material is useful as a magnetic deactivator for electromagnetic security articles.

REFERENCES:
patent: 4381492 (1983-04-01), Steingroever et al.
patent: 4470031 (1984-09-01), Steingroever et al.
patent: 4684930 (1987-08-01), Minasy et al.
patent: 4737753 (1988-04-01), Oudet

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