Optical recording medium, recording material, method of producing optical recording medium, and optical recording, reading and rewriting method

Abstract

An optical recording medium including a recording layer which includes a reversible phase-change recording material, the recording layer being capable of writing information therein, reading written information therefrom, and rewriting written information by utilizing the reversible phase change of the phase-change recording material, wherein when a recording mark formed in the recording layer is repeatedly read 5000 times, using a continuous wave laser beam having such an intensity Pr that satisfies the condition of 1.1≦R≦2.0, in which R is σrepeat / σ1 as defined in the specification, the optical recording medium satisfies a relationship of d1>dow as defined in the specification. The phase-change recording material, a method of producing the optical recording medium, and a method of writing information in the optical recording medium, reading written information therefrom and rewriting written information therein are proposed.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an optical recording medium comprising a recording layer which is capable of writing information therein, reading written information therefrom, and rewriting written information therein. The present invention also relates to a recording material for use in the recording layer of the optical recording medium. [0003] The present invention also relates to a method of producing the optical recording medium. [0004] The present invention also relates to a method of writing information in the optical recording medium, reading written information therefrom, and rewriting written information therein. [0005] 2. Discussion of Background [0006] As an optical recording medium capable of writing information therein, reading written information therefrom, and rewriting written information therein, with a light beam irradiation, there is well known a phase-change optical recording medium, which uti...

AI Technical Summary

Benefits of technology

"The present invention provides an optical recording medium that overcomes the problems in conventional optical recording media, such as slow recording linear velocity, poor preservation stability, and unstable reading and writing optical stability. The medium uses a recording layer that can perform a reversible phase change from crystalline to amorphous and vice versa by light irradiation. The recording layer is made of a phase-change recording material that can write, read, and rewrite information. The medium has high correspondence to the recording linear velocity and excellent reading and writing optical stability. The invention also provides a recording material for use in the optical recording medium and a method of producing the medium. The technical effects of the invention include improved recording speed, better preservation stability, and better reading and writing optical stability."

Problems solved by technology

Such media have the problems that when the recording linear velocity is increased, the preservation stability and the reading optical stability deteriorate, and that when recording density is increased by reducing the size of the beam spot on the side of the drive, a sufficient sensitivity for use in practice cannot be obtained.

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