| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a land/groove recording optical disk of a high recording capacity that hardly causes crosstalk. <P>SOLUTION: The optical disk is obtained by forming a recording layer film or the like on an optical disk substrate in a predetermined form. In the optical disk substrate, land tracks and groove tracks are formed spirally, and on the bottom surface 12a of the groove track 12, a curved and projecting track 13 lower than the land track 11 is formed along the groove track 12, wherein the top part 13a of the projecting track 13 is lower than the top part 11a of the land track 11 (H2>H1). Recording layers are formed on the land tracks and the groove tracks of the optical disk substrate. In this case, the film thickness of the recording layer of a corner part of the bottom surface 12a of the groove track is thinner than the film thickness of the recording layer on the land mark. <P>COPYRIGHT: (C)2008,JPO&INPIT |
