Head positioning system with automatic gain control

Details Head positioning system with automatic gain control Head positioning system with automatic gain control

1983-06-15

1986-03-25

McElheny, Jr., Donald

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 67, 318677, G11B 2110, G11B 502

Patent

active

045787239

ABSTRACT:
A head positioning system with automatic gain control for use in disk information storage apparatus employs multiphase radial position error signals derived from position reference information on the disk to control the position of a transducing head by means of a head positioning actuator. A variable gain amplifier amplifies the signals from the transducing head prior to their application to a position error signal generating means. The gain of the amplifier is controlled in a gain control loop by a gain function. The gain function is derived by combining the differnet phase position error signals to provide, at any position of the head, a measurement of the rate of change of the position error signals per track of displacement. This system affords gain control which is substantially independent of head width and limits variations in offtrack gain between heads.

REFERENCES:
patent: 3593333 (1971-07-01), Oswald
patent: 3691543 (1972-09-01), Mueller
patent: 3818502 (1974-06-01), Chien et al.
patent: 4297734 (1981-10-01), Laishley
patent: 4326226 (1982-04-01), Touchton et al.
patent: 4415939 (1983-11-01), Ballard
IBM TDB, vol. 18, No. 8, "Null Servo Pattern", Betts, Jan. 1976, pp. 2656-2657.
IBM TDB, vol. 20, No. 1, "Off-Track Gain Calibration of Position Error Signal", Palmer, Jun. 1977, pp. 349-350.
IBM J. Res. & Devel., Nov. 1974, pp. 506-512, "Design of a Disk File Head-Positioning Servo", Oswald.

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