| 摘要 |
A single-sided dual-layer optical disc (70) comprising an optically transparent layer (87); a first recording layer (81) accessed by a first laser beam (30); an intermediate layer (85); and a second recording layer (83) accessed by a second laser beam (60), wherein the optically transparent layer, the first recording layer, the intermediate layer, and the second recording layer are sequentially disposed in a laser beam incidence direction, wherein a thickness of the optically transparent layer, which is a distance from a light incident surface to the first recording layer, is 550 to 575 µm, wherein a thickness of the intermediate layer, which is a distance between the first and second recording layers, is 29 to 47 µm, and wherein a surface recording density of the second recording layer is at least 3 times that of the first recording layer.
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