| 摘要 |
<p>In an optical recording medium in which marks are allowed to be written at grooves (G) and information has been recorded beforehand in the form of prepits (PP) in a prepit area, the medium is constructed so that the groove width, Wg, the land width, Wl, and the prepit width, Wp, satisfy the relationships of either Wl < Wg, and Wp < Wg, or Wl > Wg, and Wp > Wg. Alternatively or additionally to the above, a sum of lengths of pit-presence portions in the prepit area is larger than a sum of lengths of pit-absence portions in the prepit area. <IMAGE></p> |
