| 摘要 |
An optical disk has a substrate, a first protective layer formed on the substrate, a recording layer formed on the first protective layer, a second protective layer formed on the recording layer, and a reflective layer formed on the second protective layer. The recording layer includes a composition expressed as (SbxTe1-x)aGebInc in which atomic ratios are 0.77 ≤ x ≤ 0. 84, 0. 85 ≤ a ≤ 0. 95, 0.01 ≤ b ≤ 0. 10 and 0. 01 ≤ c ≤ 0. 10 where a + b + c = 1. <IMAGE>
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