| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical information storing medium that has both lands and grooves which can obtain a push-pull signal stably, as recording tracks. SOLUTION: The optical information storing medium has a plurality of grooves 26 and lands 28 formed alternately wherein each of lands 28 and grooves 26 serve as recording tracks. The optical information storing medium includes a first header area having a first phase pit formed on the extension of each land 28, and a second header area having a second phased pit formed on the extension of each groove. Assuming that the wavelength of a light beam used is λ, each groove has an optical depth of 3 λ/8, the first phase pit has an optical depth shallower than each groove, and the second phase pit has an optical depth substantially equal to that of each groove. Furthermore, the first and second header areas are shifted from each other in the direction of extension of each track. |
