Optical disk having a high density recording layer and a low den

Details Optical disk having a high density recording layer and a low den Optical disk having a high density recording layer and a low den

1997-08-05

1999-03-16

Neyzari, Ali

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369283, 428694ML, G11B 724

Patent

active

058838775

ABSTRACT:
An optical disk on which information which can be optically read is recorded having a first information recording layer formed in the vicinity of the middle of the direction of the thickness of the disk, a second information recording layer formed in the vicinity of the surface of the optical disk for storing information at a lower density than the first information recording layer and a light incidence surface into which a first and second playback laser beam is irradiated for reading the information in the first and second information recording layers. The light incidence surface is formed on the side of the optical disk opposite the surface, where the second information recording layer is made. The thickness of the disk from the light incidence surface to the second information recording layer should preferably be substantially equal to the thickness of the optical disk.

REFERENCES:
patent: 5696754 (1997-12-01), Nishizawa

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