| 摘要 |
<p>PCT No. PCT/JP94/01666 Sec. 371 Date Sep. 5, 1995 Sec. 102(e) Date Sep. 5, 1995 PCT Filed Oct. 5, 1994 PCT Pub. No. WO96/11471 PCT Pub. Date Apr. 18, 1996The present invention relates to a phase-change type optical disk comprising a transparent substrate; a recording layer arranged on the transparent substrate wherein a phase-change occurs between crystalline state and amorphous state according to laser power irradiation; and protective layers arranged on and directly under the recording layer; the composition of the recording layer being represented by the general formula (SbaTebGec)100-d.Sd, wherein 5</=a</=60, 35</=b</=65, 5</=c</=65, a+b+c=100 and 0<d</=40, and/or one or both of the protective layers comprising a mixture of Zn(1-x)Sx wherein 0.50<x and one or more oxides, nitrides, fluorides, carbides and sulfides of metals or semimetals (proviso provided that sulfides are excluded when the metal is Zinc). The optical disk of the present invention is improved in a cyclability, i.e., number of overwrite cycles and error correctable cycles, and reduces deterioration of recording marks due to long term reading.</p> |
