Optical read/write apparatus with improved tracking performance

Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system

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Details

369122, 369119, 369 4437, G11B 700

Patent

active

051385929

ABSTRACT:
An optical read/write apparatus includes an optical device for directing a main scanning spot and a pair of satellite spots, one on either side of the main scanning spot, onto a recording. It further includes a wobbling device for moving the satellite spots in relation to the main scanning spot. The satellite spots are moved with an oscillatory motion in a direction perpendicular to tracks on the recording medium. A tracking control device detects light reflected from the satellite spots, generates a tracking error signal, and moves the main scanning spot according to the tracking error signal in a direction perpendicular to the. This keeps the main scanning spot accurately centered on a track without offset and without wobbling the main scanning spot.

REFERENCES:
patent: 4462095 (1984-07-01), Chen
patent: 4656618 (1987-04-01), Kaku et al.
patent: 4935913 (1990-06-01), Shinoda
"Principles of Optical Disc Systems," Bouwhuis et al., Adam Hilger Ltd., 1985.

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