| 摘要 |
In an information recording medium comprising at least a substrate, a recording layer, and a resin layer, the substrate is formed with at least a pit corresponding to a read only area (31) and a groove corresponding to a recording/reproducing area (32) without overlapping with each other. A reflectivity of the recording layer is specified to be more than 10 %. The recording layer and the resin layer are continuously adhered over both the read only and recording/reproducing areas (31 and 32). The information recording medium is characterized in that both push-pull signal outputs (T1 and T2), which are reproduced from the read only area (31) and the recording/reproducing area (32) respectively, are more than 0.1 and satisfy an inequality 1.5 ‰§ T1/T2 ‰§ 0.5,
wherein said push-pull signal is measured by dividing an output difference between an inner circumference side and an outer circumference side of a photodetector (9) provided in an optical pickup for recording/reproducing said information recording medium by total outputs from said photodetector,
and wherein a plurality of marks (24) is recorded in said grooves (22), and
a minimal pit length (L1) in said read only area (31) and a minimal pit length (L2) of the recorded marks in said recording/reproducing area (32) are equal to each other. |
