Patent ID: 8018823

Claim:
An information recording medium comprising a recording track formed by a concave-convex pattern, wherein the recording track comprises a first recording region R 1 , a second recording region R 2 and a recording region transition section Sx arranged between the first recording region R 1 and the second recording region R 2 ; a track pitch tp 1 , a groove width w 1 and a groove depth d 1 in the first recording region R 1 , and a track pitch tp 2 , a groove width w 2 and a groove depth d 2 in the second recording region R 2 satisfy formula (1), (2) and/or (3): 0 <|tp 1 −tp 2| (1) 0 <|w 1 −w 2| (2) 0 <|d 1 −d 2| (3); the recording region transition section Sx comprises a track pitch transition section Stp in which the track pitch changes from tp 1 to tp 2 and a groove shape transition section Sg in which the groove width changes from w 1 to w 2 and/or the groove depth changes from d 1 to d 2 ; the track pitch transition section Stp and the groove shape transition section Sg at least partially overlap to share a region SL; and provided that a maximum value of normalized push-pull signal amplitude in a non-recorded state is NPP max and a minimum value of the amplitude is NPP min in the first recording region R 1 and the second recording region R 2 , a normalized push-pull signal amplitude NPP satisfies formula (6) in the entire region of the recording region transition section Sx: NPP min ≦NPP≦NPP max (6).