Double-layer optical disk, recording method and manufacturing me

Dynamic information storage or retrieval – Systems having plural physically distinct independent tracks... – Having layered storage medium

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3692753, G11B 700

Patent

active

058448764

ABSTRACT:
A double-layer optical disk comprises first and second substrates which include information pits 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 formed on the first substrate is different in size from the information pit formed on the second substrate.

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