Double-layer optical disk, recording method and manufacturing method of this optical disk

摘要

A double-layer optical disk comprises first and second substrates (1,5) which include information pits (p1, p2) and are bonded at their confronting faces. Each substrate has at least one information pit formed on a surface thereof for recording the information, and receives reproduction light irradiated from a predetermined reading direction. And, the information pit (p1) formed on the first substrate (1) is different in size from the information pit (p2) formed on the second substrate (5).