Index servo type magnetic head positioning control apparatus and

Details Index servo type magnetic head positioning control apparatus and Index servo type magnetic head positioning control apparatus and

1986-06-26

1987-09-29

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

318634, 360 77, G11B 555, G11B 556

Patent

active

046972137

ABSTRACT:
According to the invention, a magnetic head positioning control apparatus using an index servo data has a circuit for determining a final correction value such that a magnetic head position correcting operation is repeatedly performed at a designated track position. The apparatus also has a circuit for obtaining final correction values for two different tracks, to calculate a thermal offset value accordingly. A correction current value and a track position can be expressed by a linear relation, and two coefficients of the relation can be determined using the two final correction current values. When an arbitrary track position is designated, a thermal offset value can be determined with reference to the two coefficients of the relation and the designated track position.

REFERENCES:
patent: 4122503 (1978-10-01), Allan
patent: 4136365 (1979-01-01), Chick et al.
patent: 4620244 (1986-10-01), Krause

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