Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1998-08-21
2000-11-28
Psitos, Aristotelis M.
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
G11B 724
Patent
active
06154440&
ABSTRACT:
An optical disc comprises a disc substrate having a groove and a land, and a recording layer formed thereon through a transparent film. In such an optical disc, when a width of a land on a flat surface of the disc substrate is W.sub.L, a width of the groove is W.sub.G, an average angle of inclination of a side wall of the groove is .theta., and a film thickness of a transparent film on a flat surface of the disc substrate is D.sub.U, the average angle of inclination .theta. of a side wall of the groove is 50.degree. or more and, at the same time, a condition of D.sub.U (1-cos .theta.)/2 sin .theta..ltoreq.W.sub.G -W.sub.L .ltoreq.4D.sub.U (1-cos .theta.)/sin .theta. is satisfied. By satisfying such conditions, not on a flat surface of the disc substrate, but at a position of a recording layer, symmetry of a groove portion and a land portion can be enhanced. Therefore, in an optical disc of a land/groove recording/reproducing type, a recording condition of a mark row onto a land and reproducing signal quality and a recording condition of a mark row onto a groove and reproducing signal quality can be made uniform.
REFERENCES:
patent: 5459712 (1995-10-01), Sugaya et al.
patent: 5517486 (1996-05-01), Haneda et al.
patent: 5763037 (1998-06-01), Ohtomo et al.
patent: 5798987 (1998-08-01), Ogawa
Nishiyama et al: Digest on 8th Phase-change recording Symposium (in Japanese) pp. 77-81, Nov. 28, 1996.
Kabushiki Kaisha Toshiba
Psitos Aristotelis M.
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