Method and apparatus for fast positioning a head of a recording

Details Method and apparatus for fast positioning a head of a recording Method and apparatus for fast positioning a head of a recording

1996-05-22

1998-09-08

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7808, G11B 5596

Patent

active

058053743

ABSTRACT:
To achieve fast positioning of a head by determining an initial value dynamically from state variables of a system at a switching time of control modes. In a recording device having a head, a recording media including a plurality of tracks accessed by the head, and a motor for moving the head, in order to position the head to a target track by switching control modes and outputting a control signal value u(n) to drive the motor in response to an input signal value y(n) representing a difference between a current position of the head and the target track, the gain of a control system having the input and control signal values as state variables is changed only at a mode switching time.

REFERENCES:
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patent: 5369345 (1994-11-01), Phan et al.
Patent Abstract ofJapan vol. 013382, Takayuki, Magnetic Disk Device, Aug. 24, 1989.
Patent Abstract of Japan, vol. 015214, Yozo, Magnetic Head Speed Controller and Magnetic Disk Device, Mar. 13, 1991.
Patent Abstract of Japan, vol. 012341, Yoshitaka, Magnetic Disk Device, Sep. 13, 1988.
Oswald, Head Positioning Servo Systems and High Track Densitty, Mar. 24, 1988.

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