| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a rewritable phase-change optical recording medium with high reproduction durability and with less reproduction deterioration even when the medium is multilayered and/or has a higher rate, in an optical system of λ/NA≤500. <P>SOLUTION: The optical recording medium 10 is configured with a substrate 12, a first information layer 14, a spacer layer 22, a second information layer 16 which includes a recording film 18 including Sb as a main component and V or V and In as a sub-component, and a cover layer 24. When an amorphous mark formed in the recording layer 18 is irradiated with a reproduction beam, crystallization of the amorphous mark occurs only in a central portion in the width direction which is orthogonal to a scanning direction of a laser light. The amount of reduction in the degree of modulation caused by durability of repeated reproduction saturates to a certain value. <P>COPYRIGHT: (C)2009,JPO&INPIT |
