Very high field micro magnetic roller and method of making same

Details Very high field micro magnetic roller and method of making same Very high field micro magnetic roller and method of making same

1995-01-10

1997-11-25

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

335306, H01F 702

Patent

active

056916825

ABSTRACT:
A very high field micro roller magnetic recorder of 20 poles having an outside diameter of 0,130" is disclosed, as is the method for making such a micro roller magnetic recorder. The phrase, "very high field", as applied to the micro roller recorder of the present invention is defined as a surface field intensity of at least 1000 Oe. Rather than mounting discrete magnets around the periphery of a non magnetic drum in fabricating a magnetic roller recorder, the present invention teaches use of a magnetizable cylinder of high energy magnetic material, such as NdFeB, magnetized to saturation in a pattern of circumferentially located poles by use of a fixture fabricated as follows. A solid conducive cylinder is slotted in the axial direction to generate a serpentine conductive pattern to which lead wires are connected. The cylinder is potted in epoxy, and the center bored out to accept the small diameter high magnetic energy roller to be magnetized. A charged capacitor bank, carefully sized to provide a current pulse to completely saturate the high energy magnetic material without the risk of exploding the fixture is discharged through the winding of the fixture to magnetize the pole pattern of the roller.

REFERENCES:
patent: Re34229 (1993-04-01), Shimizu et al.
patent: 4326908 (1982-04-01), Hiya et al.
patent: 5019796 (1991-05-01), Lee et al.

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