Phase change optical disk medium

Details Phase change optical disk medium Phase change optical disk medium

1998-08-18

2000-01-11

Dinh, Tan

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

43027013, G11B 724

Patent

active

060143630

ABSTRACT:
A phase change optical disk medium includes a disklike substrate, and a recording layer formed by a laminate of a plurality of thin layers including a phase change layer. Information marks are recorded on the phase change layer by phase changes from a crystal phase to an amorphous phase and vice versa. The recording layer has tracks for recording information marks formed by groove portions and land portions respectively taking alternate concave and convex shapes. The track has an interval in range of 0.54 to 0.64 .mu.m and the recording layer has a ratio of the optical reflectance of 0.35 or less when the phase change layer has changed to the amorphous phase in case where the optical reflectance of the recording layer is 1 when the phase change layer is in the crystal phase.

REFERENCES:
patent: 5187052 (1993-02-01), Maeda et al.
patent: 5479382 (1995-12-01), Nishida et al.
patent: 5650992 (1997-07-01), Ohkubo
patent: 5745475 (1998-04-01), Ohno et al.
Standard ECMA-272, Standardizing Information and Communication Systems, 120 mm DVD Rewritable Disk (DVD-RAM), Feb., 1998.
DVD Specifications for Rewritable Disc (DVD-RAM) Version 1.0, Jul. 1997.

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