Phase change optical disk having reflection layer of noble metal, and optical data storage system therefor

Abstract

A high-density phase change optical disk used as DVD-RAM, includes a reflection layer made of a noble metal which have characteristics of high thermal conductivity, high reflectivity and high melting temperature, such as copper (Cu), silver (Ag) or gold (Au). Accordingly, the phase change optical disk according to the present invention largely increases the number of times of overwriting, compared with the phase change optical disk having a reflection layer made of aluminum (Al). Also, the cross-erasing phenomenon that when writing information on a target track, information recorded on a track adjacent to the target track is deleted, is remarkably reduced.

Description

technical field [0001] The invention relates to a phase-change optical disc capable of being read and written repeatedly. In particular, it relates to high-density phase-change optical discs, which are capable of increasing the number of overwrites and reducing cross-erasing in a land / groove recording method by using a reflective layer made of a new material, relating to The resulting optical data storage system. Background technique [0002] figure 1 The general phase-change optical disk shown is composed of a substrate and multilayer thin films deposited sequentially from the laser beam incident side. The multilayer film includes a first dielectric layer, a recording layer, a second dielectric layer and a reflective layer deposited sequentially from a substrate. in having and figure 1 In the phase change optical disc with the same layer structure shown, the reflective layer reflects the laser beam passing through the recording layer back to the recording layer. Due to...

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Problems solved by technology

It is difficult to use a disc with a jitter amount exceeding 15% or more as a recording medium

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