Positioning apparatus for a magnetic head of a magnetic disk dri

Details Positioning apparatus for a magnetic head of a magnetic disk dri Positioning apparatus for a magnetic head of a magnetic disk dri

1985-06-17

1986-01-21

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 75, 360 86, 360 97, 318618, G11B 2108, G11B 1700, G05B 501

Patent

active

045660468

ABSTRACT:
A positioning apparatus for a magnetic disk drive apparatus including a biasing means for returning a carriage on which the magnetic head is mounted to a fixed position whenever a power source for the apparatus is cut off, and force compensation circuits operably connected to the carriage for supplying the carriage with an opposite force equivalent to the force of the biasing means as a function of the magnetic head position relative to the disk. The control force compensation circuits the speed of the carriage as it changes position from one track to another track and maintain the magnetic head in proper position over the selected track once it is reached.

REFERENCES:
patent: 3924268 (1975-12-01), McIntosh et al.
patent: 4139874 (1979-02-01), Shiraishi
patent: 4285015 (1981-08-01), Rose et al.
patent: 4288731 (1981-09-01), Lee
patent: 4321517 (1982-03-01), Touchton et al.
patent: 4331989 (1982-05-01), Viskochil
patent: 4336718 (1982-06-01), Washburn
patent: 4439800 (1984-03-01), Powell
patent: 4485414 (1984-11-01), Baker
IBM Disk Storage Technology, pp. 89-97, "Servo Design for an Eight-Inch Disk File", Commander et al.; Feb. 1980.
Oswald, "Design of a Disk File-Head-Positioning Servo", IBM J. Res. Develop., pp. 506-512.

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