| 摘要 |
PROBLEM TO BE SOLVED: To provide a one surface double-layer optical disk with which recording/reproduction can be carried out stably with respect to eccentricity by setting a track pitch of a recording layer on a cover sheet side wider than that of a recording layer on a substrate side. SOLUTION: This one surface double-layer optical disk has a first recording layer 12 which is formed on a molded substrate 11 and in which tracks are formed at a first pitch interval, a second recording layer 14 which is provided thereon across an intermediate layer 13 and in which tracks are formed at a second pitch interval wider than the first pitch, and a cover layer 15 which has a thickness of 0.6 mm or lower and is provided on the second recording layer. Since the track of the second recording layer 14 on the cover layer side is formed wider, recording/reproducing is surely carried out with respect to eccentricity. |
