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Proceedings Paper

Melt-Erasing Method Of Single Beam Overwrite For Phase-Change Optical Disk
Author(s): Norio Gotoh; Masaji Ishigaki; Yukio Fukui; Hisashi Andoh; Yoshihito Maeda
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Paper Abstract

A new single beam overwrite method for a phase-change optical disk is proposed to obtain both high carrier to noise ratio (CNR) and high overwrite erasing ratio. Contrary to ordinary method is, both writing and erasing process are controlled over the melting point of a phase-change recording film. To realize new overwriting method, we discuss desired thermal characteristics of a disk and crystallization properties of recording film theoretically. Necessary conditions to realize this method are (1) optical disks must have high thermal conductivity to control cooling rate, (2) recording material may have adequate crystallizing tine within dynamic range of disk's cooling rate. Examination on this method was carried out by using newly developed In-Sb-Te phase-change optical disk. CNR higher than 50dB and erasing ratio higher than 40dB were obtained.

Paper Details

Date Published: 19 May 1989
PDF: 12 pages
Proc. SPIE 1078, Optical Data Storage Topical Meeting, (19 May 1989);
Show Author Affiliations
Norio Gotoh, Hitachi,Ltd. (Japan)
Masaji Ishigaki, Hitachi,Ltd. (Japan)
Yukio Fukui, Hitachi,Ltd. (Japan)
Hisashi Andoh, Hitachi,Ltd. (Japan)
Yoshihito Maeda, Hitachi,Ltd. (Japan)

Published in SPIE Proceedings Vol. 1078:
Optical Data Storage Topical Meeting
Gordon R. Knight; Clark N. Kurtz, Editor(s)

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