Optical disc, optical disc manufacturing method, and optical...

Details Optical disc, optical disc manufacturing method, and optical... Optical disc, optical disc manufacturing method, and optical...

2006-08-16

2009-08-04

Huber, Paul (Department: 2627)

Dynamic information storage or retrieval

Systems having plural physically distinct independent tracks...

Having layered storage medium

C369S283000

Reexamination Certificate

active

07570566

ABSTRACT:
According to one embodiment, an optical disc is the following the distance between a light incidence plane and the first recording layer is a minimum of 550 μm. The distance between the first and the third recording layer is a maximum of 72 μm. The distance between the second and the third recording layer is a minimum of 15 μm. The distance between the first and the second recording layer is about 31 to 40 μm. The reflectivities of the first and the second recording layer with respect to the first laser beam range from 18 to 27%, and the ratio therebetween is about 1.1 or less. The reflectivity of the third recording layer is below about 6%. The areal recording density of the third recording layer is three times or more as high as that of the first recording layer and the second recording layer.

REFERENCES:
patent: 5764621 (1998-06-01), Choi
patent: 10-40574 (1998-02-01), None
patent: 11-134710 (1999-05-01), None
patent: 11-232700 (1999-08-01), None
patent: 2001-176129 (2001-06-01), None
patent: 2005-63518 (2005-03-01), None
120 mm DVD—Read-Only Disk, Standard ECMA-267, 3rdEdition, Apr. 2001, 92 pages.

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