| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly reliable optical disk and an optical disk device capable of reproducing address information and data without any erroneous detection with respect to an optical disk having different guiding groove widths between an address information section and a data section. SOLUTION: The length dimension L2 of a track where the guiding groove widths of an address information section 3 and a data section 4 are continuously changed is continuously changed stepwise from the inner periphery of an optical disk to its outer periphery according to a linear speed V2 on the disk of an optical head, the reduction cut-off frequency FC of a reproduction amplifier is set to a DC fluctuation frequency F2 or higher by the groove width change of a reproducing signal and, thus high reliability is secured by enabling sure reading of address information and data. |
