| 摘要 |
An read-only information plane 11A consisting of irregular pits is formed on the upper surface of a substrate 11 made of a transparent material such as plastic by a method such as injection molding; a transparent spacer layer 12 having a higher refractive index than that of the substrate 11 is provided thereon; a tracking guide groove 12A is formed on the upper surface of the transparent spacer layer 12; a writing information recording layer 13 and a protective layer 14 consisting of phase-change material or magneto-optical material are successively superimposed thereon.
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