Multiple layer optical disk storing information at a like multip

Details Multiple layer optical disk storing information at a like multip Multiple layer optical disk storing information at a like multip

1999-05-12

2000-05-30

Neyzari, Ali

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369 13, G11B 1100, G11B 724

Patent

active

060698683

ABSTRACT:
A two-layer disk or a three-layer optical disk consisting of two base disks fastened together and capable of low density recording, medium density recording and further high density recording in a process for fastening together two base disks of transparent synthetic resin and each base disk has two reflective films respectively for high density information recording and low density information recording. The information record layer (high density recording layer) for the first optical base disk is reproduced at optical parameters of a wavelength (.lambda.) less than or equal to 460 nm and a numerical aperture (NA) greater than or equal to 0.6. The information record layer (low density recording layer) for the second optical base disk is reproduced at optical parameters of a wavelength (.lambda.) greater than or equal to 770 nm and less than or equal to 830 nm and further has a numerical aperture (NA) equal to 0.45 plus or minus 0.05.

REFERENCES:
patent: 5708652 (1998-01-01), Ohki et al.
patent: 5923625 (1999-07-01), Shimazaki et al.

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