| 摘要 |
<P>PROBLEM TO BE SOLVED: To smoothly execute crossing reproduction between two areas in an information recording medium having a read only area and a recording and reproducing area together. <P>SOLUTION: The information recording medium 1 consists of a recording layer 12 and a light transmission layer successively provided on a substrate 13 and has a read only area 30 and a recording and reproducing area 40, a wobbling groove corresponding to the read only area and another wobbling groove corresponding to the recording and reproducing area are formed on the substrate 13 without overlapping with each other, the recording layer 12 and the light transmitting layer 11 are continuously adhered over at least two areas of the read only area 30 and the recording and reproducing area 40, reflectivity of the recording layer 12 is more than 5%, a push-pull signal output T3 reproduced from the read only area 30 and another push-pull signal output reproduced from the recording and reproducing area before recording satisfies relations of T3≥0.1, T4≥0.1 and 1.5≥T3/T4≥0.5. <P>COPYRIGHT: (C)2004,JPO |
