| 摘要 |
A high-density dual-layer optical disc is disclosed, comprising: a light incident surface and an opposite surface; a substrate including a transparent layer having a refractive index; a first recording layer and a second recording layer, the first recording layer being located spaced apart from the light incident surface by a first substrate thickness (t1), and the second recording layer being located between the first recording surface and the opposite surface at a second substrate thickness (t2) from the light incident surface; wherein a distance between the first recording layer and the second recording layer is set in a range of 19 ± 15 µm, and wherein the refractive index is between 1.45 and 1.70. |
