| 摘要 |
<p>An optical disc comprises; a pit-train region having a read-in zone, a program zone and a read-out zone which are disposed outwards in turn on a data-recorded-surface; and a margin zone at an outer periphery of the pit-train region e.g., a label space. Pits are recorded on the disc in such a manner that a width of the pit-train region in a radial direction of the optical disc is larger than a diameter of a tilt-sensing light beam spot formed and used for a tilt-servo adjustment of an incline angle between an optic axis of a data-reading light beam and the data-recorded-surface. <IMAGE></p> |
