Optical disk and optical disk recording and reproducing device

Dynamic information storage or retrieval – Storage medium structure – Layered

Reexamination Certificate

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Details

C369S094000, C369S272100, C369S275500, C369S280000

Reexamination Certificate

active

07859983

ABSTRACT:
An optical disk includes a plurality of disk sheets which are laminated, and each of which has a recording face on one of the surfaces and a flat back surface, wherein the plurality of disk sheets are laminated by adhesive layers in such a manner that between adjacent two disk sheets, a back surface of one of the disk sheets, on the opposite side of the surface where the recording face is formed, faces the disk surface of the other disk sheet. The foregoing structure realizes an optical disk of desirable recording/reproducing characteristics, which is flat and has a fixed interval between recording faces, and which permits the problems of coma aberration, spherical aberration, etc., to be suppressed.

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