Disc drive fine servo velocity control and method for head posit

Details Disc drive fine servo velocity control and method for head posit Disc drive fine servo velocity control and method for head posit

1988-03-07

1990-04-24

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7708, 360 7814, 369 32, G11B 555, G11B 2108, G11B 2110

Patent

active

049204629

ABSTRACT:
A disc drive 22 having a head 26 actuated by an actuator 32 for seeking out a destination track 30 includes servo velocity control circuitry 51 and servo position control circuitry 41. The servo velocity control circuitry 51 seeks out the destination track and places the head within the boundaries of that track while the servo position control circuitry 41 using servo information places the head on the centerline of the destination track. The fine servo control circuitry 20 is provided for communicating the information generated by the servo position control circuitry 41 to the servo velocity circuitry 51 when the head 26 is several tracks from the destination track in order to allow the actuator 32 to smoothly and quickly cause the head to seek within the boundaries of the destination track without overshooting that track.

REFERENCES:
patent: Re32075 (1986-01-01), Harrison et al.
patent: 3994016 (1976-11-01), Moghadam
patent: 4103314 (1978-07-01), Case
patent: 4135217 (1979-01-01), Jacques et al.
patent: 4480279 (1984-10-01), Hashimoto
patent: 4488187 (1984-12-01), Alaimo
patent: 4630190 (1986-12-01), Alaimo et al.
patent: 4679103 (1987-07-01), Workman
patent: 4701898 (1987-10-01), Giddings
IEEE Transactions on Magnetics, vol. Mag-14, No. 4, McKnight, Jul. 1978, pp. 182-184.

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