Optical disk device for record and reproduction of additional in

Details Optical disk device for record and reproduction of additional in Optical disk device for record and reproduction of additional in

1991-09-16

1992-11-24

Nguyen, Hoa

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 14, 369124, 3692751, 3692752, 3692754, 360 59, 360114, G11B 712, G11B 1110, G11B 1112, G11B 1304

Patent

active

051669137

ABSTRACT:
An optical disk includes a substrate disk and an additional recording layer formed on a surface of the substrate disk. A series of pits and lands is formed on the surface of the substrate disk for recording basic information which includes address and data information along a basic recording track. The additional recording layer is for voluntarily and additionally recording additional information along an additional recording track positioned over the basic recording track. The basic and additional information can be reproduced by a basic information reproducing circuit and additional information recording and reproducing circuit, respectively. The additional information recording and reproducing circuit also records an additional information along the additional recording track so that the additional information is recorded over portions where the data information of the basic information is recorded.

REFERENCES:
patent: 4716560 (1987-12-01), Itonaga
patent: 4730289 (1988-03-01), Saito et al.
patent: 5020040 (1991-05-01), Lee
patent: 5023856 (1991-06-01), Raaymakers et al.
patent: 5031162 (1991-07-01), Morimoto et al.

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