| 摘要 |
PROBLEM TO BE SOLVED: To provide an information recording medium in which excellent reproduction information from pit rows for reproduction only and also excellent reproduction information from guiding grooves for recording and reproduction can be both obtained by reproducing an intermediate region composed of the pit row by a tracking system of a differential push-pull system or a phase difference system, further optimum tracking characteristic can be always obtained even in an unrecorded region and optimum tracking characteristic can be always obtained even in a recorded region. SOLUTION: In the information recording medium, bottom surface positions of the guiding groove and the pit row formed on a disk substrate are located on the same plane and both are even and the intermediate region composed of the pit row, height of which changes between height from the bottom surface to a flank of the guiding groove and height from the bottom surface to a flank of the pit row, is provided at a change-over part where the pit row changes to the guiding groove or the guiding groove changes to the pit row. |
