| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a phase transition type optical information recording medium which has the capacity equal to that of a DVD-ROM, can secure a sufficient modulation degree even in such a wide range of recording linear velocity as 3.5 m/s to 35 m/s, excellent overwrite repetition characteristics and high preservation reliability. <P>SOLUTION: In the phase transition type optical information recording medium which comprises a first heat resistant protective layer, a recording layer, a second heat resistant protective layer and a reflective layer in this order or in the reverse order, wherein the recording layer is caused to develop a phase change reversibly under the irradiation by an electromagnetic wave to execute the recording and reproduction of information using the optical change, the optical recording medium is constituted of Ga, Sb, Sn and Co (1). When the composition formula of the recording material is expressed by GaαSbβSnγCoδ (wherein, α, β, γ, δ are each an atom.%, α+β+γ+δ=100), the relation among α, β, γ, δ in the optical recording medium expressed in (1) satisfies formulas; 3≤α≤52; 42≤β≤92; 3≤γ≤25; 0.1≤δ≤2 (2). <P>COPYRIGHT: (C)2004,JPO |
