| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a multilayer recording disk which can record or read information data accurately, and a playback system. <P>SOLUTION: In a multilayer recording disk, a plurality of information recording surfaces are formed by separating each contiguous information recording surfaces at a distance of more than three times of a capture range in a focal error signal obtained in irradiating an information recording face with reading light. Thereby, error signal components in a focus error signal under the influence of reflection light from a defocus information recording face is reduced. <P>COPYRIGHT: (C)2004,JPO |
