| 摘要 |
PROBLEM TO BE SOLVED: To permit the reproducing of recording of an information stably by restraining the jitter constituent of a wobble signal at a sufficiently low value in practical use while realizing the increasing of a recording density. SOLUTION: The track pitch of a recording track is set so as to be lower than 1.3 μm and a material containing a pigment having a suitable nature for restraining the jitter constituent of the wobble signal at a low value is employed as a recording material constituting a recording layer. |
