Flux sensitive tracking

Details Flux sensitive tracking Flux sensitive tracking

1985-05-03

1987-03-24

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360113, 360131, G11B 2110, G11B 533, G11B 574

Patent

active

046529454

ABSTRACT:
Given a medium comprised of a vertically recordable underlying region of a magnetic material and a cooperating overlying region of horizontally recordable material, the invention calls for the pre-recording of such tracking information, in the underlying region, that between adjacent tracks there occurs a vertically disposed flux reversal in the underlying region, each such track being approximately the width of a playback core disposed to read data recorded in the overlying region. Deposited on the side face of the playback core, in accordance with the invention, is a magneto-resistive element. So long as the playback core is on-track, the magneto-resistive element "sees" equal vertical fields on either side of the track edge; but should the playback core start to mistrack, the magneto-resistive element will see vertical flux of one or another polarity. Such polarized vertical flux translates into a corresponding resistance change in the magneto-resistive element which, in turn, is employed to correct the mistracking.

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