| 摘要 |
In a double-layered optical disk capable of reading two-layer information from one face, the substrates constituting this optical disk can hardly peel even with a dropping shock or a change over time. The double-layered optical disk is constituted by a transparent first substrate, a first information recording layer, and a second substrate adhered to the first substrate through the first information recording layer. The first substrate has information pits to be read with a read laser beam and is transparent to this read laser beam. The first information recording layer is formed on the information pit formation surface of the first substrate and is made of an inorganic dielectric having a higher refractive index than that of the first substrate.
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