| 摘要 |
PURPOSE:To provide the optical disk on which an information signal can be recorded and reproduced with high density without providing any special optical system nor signal processing circuit. CONSTITUTION:User recording pits are formed both at land parts 2, 3, and 4 and in guide grooves 5 and 6. The groove depth of the guide grooves is set to >=1/7+n/2 and <=5/14+n/2. Even when the signal is recorded both in the guide grooves and at the land parts, diffraction by adjacent user recording pits 8 and 9 is reduced and reproduction crosstalk is small. The recording density can, therefore, be doubled and the signal which is recorded as the recording pits can excellently be reproduced. Further, address pits 12, 13, and 14 and address pits 15 and 16 are mutually shifted not to adjoin to each other, so the crosstalk between address signals is reduced and address signals can excellently be reproduced. |
