Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1989-12-19
1993-04-06
Young, Wayne R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4442, 369109, 369120, 3692753, 3692754, G11B 700, G11B 724
Patent
active
052009416
ABSTRACT:
In the optical recording element of the invention, alignments of long thin pits inclined in various directions with respect to the track direction are formed on the tracks and information is recorded therein according to the different inclines of the pits, thereby performing higher-density and larger-volume recording without reducing the spacing between each pit and the track pitch. The invention also discloses an optical data retrieval system for use with the above optical recording element, which scans the pit alignments with a laser beam spot, detects the inclines of the pits by obtaining the distribution of the intensity of reflected light which is caused by light diffraction at the pits, and plays back information in accordance with the inclines. Therefore, not only can the substantially same structure as that of a standard type optical data retrieval system be applied to the invention without making any complicated change, but also cross-talk is less likely to be produced in the read out signals.
REFERENCES:
patent: 4310916 (1982-01-01), Dil
patent: 4562564 (1985-12-01), Bricot et al.
patent: 4707648 (1987-11-01), Minami
patent: 4967403 (1990-10-01), Ogawa et al.
patent: 4998234 (1991-03-01), Rees et al.
Deguchi Toshihisa
Matoba Hirotsugu
Terashima Shigeo
Yamaoka Hideyoshi
Huber P. W.
Sharp Kabushiki Kaisha
Young Wayne R.
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