Optical recording and reproducing system with high track density

Details Optical recording and reproducing system with high track density Optical recording and reproducing system with high track density

1988-09-01

1990-12-25

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

049808770

ABSTRACT:
An optical recording and reproducing system for an optical recording medium on which information pits are disposed in a tracking direction of the optical recording medium along adjacent tracks which are separated from each other by a predetermined gap which is half the diameter of an optical spot radiated onto the optical recording medium for recording and reproducing information using the information pits, thereby providing a high track density. Information on the optical recording medium is reproduced using a low cross-talk method in which an optical detector for detecting a light intensity distribution of the radiated optical spot after impingement on the optical recording medium has a detecting surface divided into first, second, and third detecting areas. The second detecting area is disposed between the first and third detecting areas. The information on the optical recording medium is reproduced using outputs of the first and third detecting areas.

REFERENCES:
patent: 4761775 (1988-08-01), Murakami

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