Controlling the moving speed of a magnetic head by varying the g

Details Controlling the moving speed of a magnetic head by varying the g Controlling the moving speed of a magnetic head by varying the g

1991-06-28

1994-09-06

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7806, 360 7804, 369 4429, G11B 5596

Patent

active

053453484

ABSTRACT:
In an apparatus for controlling a moving speed of a magnetic head, servo data previously recorded on a recording medium is read out during the movement of the magnetic head. A moving speed value of the magnetic head is computed on the basis of position data (representing the current position of the magnetic head) produced from the read out servo data, and a target speed value corresponding to a distance between the current position of the magnetic head and target track position is computed. The moving speed value is subtracted from the target speed value to obtain a differential speed value. The speed of the magnetic head is thus controlled in accordance with whether the differential speed value is positive or negative. Further, a target speed value corresponding to the elapsed time from the start of the movement of the magnetic head is computed, and the moving speed value is subtracted from the target speed value to obtain a differential speed value. The speed of the magnetic head is thus controlled based on the two differential speed values.

REFERENCES:
patent: 3883894 (1975-05-01), Johnson
patent: 4200827 (1980-04-01), Oswald
patent: 4314291 (1982-02-01), Ooa et al.
patent: 4794469 (1988-12-01), Kaida et al.
patent: 4965501 (1990-10-01), Hashimoto
patent: 5189571 (1993-02-01), Murphy et al.

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