Eccentricity correction during optical head accessing of a desir

Details Eccentricity correction during optical head accessing of a desir Eccentricity correction during optical head accessing of a desir

1986-03-14

1988-05-17

Cardillo, Raymond F.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 33, 369 41, 369 44, G11B 2108, G11B 7095

Patent

active

047455870

ABSTRACT:
Access method and information retrieval apparatus in which an external scale is used during accessing an optical head to a desired track on a rotating recording medium. The number of scale pitches to a target track on the external scale is detected and the speed of the head is controlled by the number of scale pitches. An eccentricity status of the rotating recording medium is previously detected and the number of scale pitches is corrected in accordance with the detected eccentricity status so that a distance of movement in a speed control is corrected and an access time is shortened.

REFERENCES:
patent: 4135217 (1979-01-01), Jacques et al.
patent: 4136365 (1979-01-01), Chick et al.
patent: 4450547 (1984-05-01), Nakamura et al.
patent: 4481613 (1984-11-01), Yokota
patent: 4509154 (1985-04-01), Kimoto
patent: 4607358 (1986-08-01), Maeda et al.
patent: 4611315 (1986-09-01), Ogino

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