| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical recording medium in which the groove shape of an L1 layer 08 is suitable for in-groove recording, and the in-groove recording is used for the L1 layer 08, for improving the recording/reproducing characteristics of the L1 layer 08. <P>SOLUTION: The optical recording medium A having a single side double-layer structure is made by laminating a first recording medium and a second recording medium via an intermediate lamination layer, wherein the groove width (half-value width) W of a second substrate 05 is set so that 0.1≤W/Tp≤0.45 is satisfied, when the groove depth Dg of the second substrate 05 of the second recording medium is in the range of 100 nm≤Dg≤200 nm, where Tp is the track pitch of the second substrate 05. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
