| 摘要 |
PROBLEM TO BE SOLVED: To reduce defective reading of address signal in a land and groove recording disk by arranging plural address blocks in address areas between adjacent groove track and land track and so as not to be contact to each other and arranging address blocks and mirror areas alternately in the address area in the circumferential direction. SOLUTION: In a groove track 13a, mirror areas 62, 64 whose lengths are equivalent to or equal to or longer than the length of an address block are respectively provided in between address blocks 21, 22 and hehind the block 22 and in a land track 12a, mirror areas 63, 61 whose lengths are equivalent to or equal to or longer than the length of the address block are respectively provided in between address blocks 23, 24 and in front of the block 23. Thus, since the adjacent tracks of respective address tracks are mirror areas, the leakage-in of reflected light quantities from the adjacent tracks is not present, a satisfactory reading of addresses is made possible without affected by crosstalk. |
