OPTICAL DISK, OPTICAL DISK DEVICE AND METHOD OF FORMING MASTER OPTICAL DISK

摘要

PROBLEM TO BE SOLVED: To provide such an optical disk which has continuity in tracking servo in ID parts and with which regenerative signals having sufficient amplitude can be obtained at about the same degree from lands and groove tacks. SOLUTION: This optical disk is reproducible from both of the land tracks and the groove tracks adjacent thereto and is formed with prepits in the land parts existing on the boundaries between the respective tracks and having the width larger than the width of the land parts of rewriting data parts. Sum signal radial push-pull signals or tangential push-pull signals are used for the reproduction of the signals.