Head tracking system in a disk drive

Details Head tracking system in a disk drive Head tracking system in a disk drive

1995-12-13

1996-10-15

Epps, Georgia Y.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4428, 369 43, G11B 1722

Patent

active

055661459

ABSTRACT:
A head tracking system includes an optical head mounting thereon a focusing lens for generating an optical spot on a disk file. The system retrieves a normalized speed profile including a first section for acceleration and a second section for deceleration based on a seeking stroke. The focusing lens is first moved based on the corrected speed profile, which is obtained by multiplying the deceleration in the normalized speed profile by a correction factor. The optical head is then moved in a feed-back loop so that the lens position error becomes zero which is deviation of the focusing lens relative to a reference position of the optical head. The correction factor is calculated by a maximum lens position error obtained during a previous seeking operation. A high-speed, stable and accurate seeking operation can be obtained even in the case of inclination of the optical head, vibration of the focusing lens or fluctuation of the supply voltage.

REFERENCES:
patent: 4615023 (1986-09-01), Inada et al.
patent: 4855982 (1989-08-01), Orlicki et al.
patent: 4866687 (1989-09-01), Kasai et al.
patent: 5255253 (1993-10-01), Kagami et al.
patent: 5339299 (1994-08-01), Kagami et al.
patent: 5402402 (1995-03-01), Kagami et al.

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