Focus-servo correction utilizing storage of detected focus error

Details Focus-servo correction utilizing storage of detected focus error Focus-servo correction utilizing storage of detected focus error

1988-08-08

1990-04-17

Richardson, Robert L.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

G11B 700

Patent

active

049186809

ABSTRACT:
An optical apparatus for focusing a light beam onto a disk medium, includes a motor for rotating the disk medium and an optical element for directing the light beam onto a plurality of sectors defined radially of the disk medium. The optical apparatus further includes a detector for detecting the light beam from the plurality of sectors of the disk medium so as to generate a pluralty of focus-error signals, each representing a distance of the optical element with respect to each of the plurality of sectors of the disk medium, and a memory for storing the plurality of focus-error signals detected from the plurality of the sectors of the disk medium. An adjuster is provided for adjusting the distance of the optical element with respect to each of the plurality of sectors of the disk medium in accordance with the plurality of focus-error signals stored in the memory.

REFERENCES:
patent: 4669077 (1987-05-01), Gerard et al.

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