Tracking apparatus for read/write head

Details Tracking apparatus for read/write head Tracking apparatus for read/write head

1981-04-22

1983-09-20

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 77, G11B 2110

Patent

active

044059566

ABSTRACT:
A tracking apparatus for the read/write head of a recording disk. Positive and negative servo marks on the disk provide sine and cosine head position signals. A calculator generates sine and cosine signal approximations from the high frequency signal outputs of variable and fixed frequency oscillators. A comparator compares the sine and cosine head position signals with the sine and cosine signal approximations and generates a corrective signal where a difference exists. The corrective signal is used to set the frequency of the variable frequency oscillator until the corrective signal is brought to zero. The signal outputs of variable and fixed frequency oscillators are fed to the up and down inputs of a head actual position counter. A second comparator compares the count on the counter with the count on a head desired position register to provide a servo error signal for operating a servo motor which moves the head to the desired track. A feedback loop supplements the corrective signal with a signal derived from actuation of the servo motor to enhance response.

REFERENCES:
patent: 4087843 (1978-05-01), Louis et al.
patent: 4115823 (1978-09-01), Commander et al.
patent: 4149201 (1979-04-01), Card
patent: 4163265 (1979-07-01), Herk et al.
patent: 4188646 (1980-02-01), Sordello et al.
patent: 4214279 (1980-07-01), Oswald
patent: 4354210 (1982-10-01), Droux
IBM/TDB, vol. 21, No. 7, Dec. 1978, p. 3030-1, "FM Processing of Position Error Signals" by Fraser.
IBM/Journal of Research & Development, Oct. 1961, pp. 287-296, "A High Track-Density Servo-Access System . . . " by Hoagland.

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