| 摘要 |
According to one embodiment, an optical disc is an optical disc having a plurality of recording pits on a recording surface, each of the plurality of recording pits having a circumferential direction length corresponding to record data, and radial direction cross-sections of the recording pits of signals of 2T, 3T and 4T in the circumferential direction length having groove forms which have deepest points in the radial direction cross-sections and become shallower from the deepest points in correspondence with a difference amount in radial directions.
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