Operating optical disk drives including calibrating a tracking e

Details Operating optical disk drives including calibrating a tracking e Operating optical disk drives including calibrating a tracking e

1990-09-28

1993-06-15

Pascal, Robert J.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

360 7708, 360 7703, G11B 1722

Patent

active

052205460

ABSTRACT:
An optical disk recorder has a fine actuator which holds an objective lens and which is movably mounted on a head carriage. Servo systems connected to the head carriage and the fine actuator cause the fine actuator to seek and track follow based upon signal recovered from a disk while the head carriage is caused to follow the motions of the fine actuator. A tracking error signal is generated indicating the relationship of the beam supplied through the objective lens with respect to tracks on the record medium. An RPE signal (relative position error) is generated by an RPE detector which indicates the relationship of the relative motion of the fine actuator to the head carriage. Both the RPE and TES are calibrated as to offset and as to gain for providing a more precise servo positioning system.

REFERENCES:
patent: 4914725 (1990-04-01), Belsar et al.
patent: 4942564 (1990-07-01), Hofer et al.
patent: 5065263 (1991-11-01), Yoshida et al.
patent: 5090002 (1992-02-01), Chow et al.
patent: 5121374 (1992-06-01), Barton et al.
patent: 5134602 (1992-07-01), Baca et al.
patent: 5136441 (1992-08-01), Kobayashi
IBM Technical Disclosure Bulletin, vol. 31, No. 11, Apr. 1989, New York US pp. 426-429; "Feed Forward Track Following".

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