Magnetic head-positioning device for magnetic disc drive

Details Magnetic head-positioning device for magnetic disc drive Magnetic head-positioning device for magnetic disc drive

1982-10-05

1985-01-15

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 555

Patent

active

044941595

ABSTRACT:
In a magnetic head-positioning device using a coil motor, a position sensor detects the median position between one track and an adjacent track so as to decelerate and stop the moving head at the adjacent track. The magnetic head is transferred over a distance of many tracks by acceleration to the median positions and repeating the operation described above. A pair of flip-flops enables the magnetic head to move from one track to another one and a summing amplifier weights inputs from a position sensor, speed sensor and feed circuit to control motion of the voice coil motor.

REFERENCES:
patent: 3699555 (1972-10-01), Du Vall
patent: 3728699 (1973-04-01), Sordello
patent: 3737883 (1973-06-01), Sordello et al.
patent: 3906326 (1975-09-01), Char
patent: 4125882 (1978-11-01), Erickson, Sr. et al.
patent: 4138728 (1979-02-01), Tung
patent: 4168457 (1979-09-01), Rose
IBM Technical Disclosure Bulletin, vol. 21, No. 5, Oct. '78, pp. 1792-1795, Offset Force Correction for Disk File, J. P. Mantey.

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