| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a phase change type optical recording medium which has the same capacity as DVD-ROM, which has a large modulation factor and enables overwriting even when a recording speed is of 8×(28 m/s) DVD and which varies little in reflectance and enables overwriting even after long-time storage. <P>SOLUTION: (1) The phase change type optical recording medium has at least a first intermediate layer, a recording layer, a second intermediate layer and a reflective layer in this sequence on a base. The recording layer is constituted of an alloy having a composition shown by GaαSnβCuγSbδ (5≤α≤20, 10≤β≤30, 5≤γ≤20, 40≤δ<80, α+β+γ+δ=100 atom%), and the recording medium is made recordable/erasable by utilizing the reversible phase change of the recording layer from an amorphous phase (amorphous) into a crystal phase, and vice versa. (2) In the phase change type optical recording medium described in (1), 5≤α≤15, 15≤β≤25, 5≤γ≤15, 50≤δ≤75. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
