Direct current bias fields for magnetic printing

Details Direct current bias fields for magnetic printing Direct current bias fields for magnetic printing

1975-04-25

1976-03-23

Eddleman, Alfred H.

Recorders

Magnetographic

360 55, G01D 1512, G03G 1900

Patent

active

039464040

ABSTRACT:
Recording head current in magnetic printing systems is reduced by application of a direct current magnetic bias field. The bias and recording fields add to produce a sum field with sufficient strength to switch a premagnetized recording medium. The bias field may be applied directly to the surface of the recording medium or may be concentrated at the recording medium surface by pin poles.
In one embodiment of the invention the bias field is supplied by a permanent magnet common pole in a pin pole-type recording head array.

REFERENCES:
patent: 3384899 (1968-05-01), Lagerqvist
patent: 3665484 (1972-05-01), Foster
patent: 3852525 (1974-12-01), Ichioka et al.
patent: 3864691 (1975-02-01), Schroeder

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