OPTICAL DISC

摘要

PURPOSE: An optical disc is provided to simplify the manufacturing and controlling of parameters related to a mastering step by simply engraving grooves through the entire areas of a disc, wherein optical power of beams becomes uniform in case of recording/reproducing by forming exclusive reproducing data by wobbles. CONSTITUTION: An optical disc for recording and/or reproducing including a read-in area(100), a user data area(110) and a read-out area(120), all being formed of grooves(123) and lands(125), wherein wobbles(105) for the exclusive use for reproducing are formed in the grooves and/or lands in the read-in area, the user data area, and the read-out area in the same or different modulation type.