| 摘要 |
PURPOSE:To provide stable operation even if recording and erasing are repeated many times and to reduce deterioration in recording characteristic such as a decrease in recording sensitivity by incorporating specific composition of Sb, Te, Ge and Co, Zr and Hf in the recording layer of an optical recording medium. CONSTITUTION:A recording layer formed on a substrate has a recording layer, a heat insulating layer and a cooling layer, and the composition of the layer is represented by a general formula, where x, y and alpha are ratio of number of atoms, Sb, antimony, Te, tellurium, Ge, germanium, M representing at least one or more of Co (cobalt), Zr (zirconium) and Hf (hafnium). The insulating layers are laminated on both side faces of the recording layer, and made of a thin film of ZnS, oxide thin film of metal such as Si, Ge, Ti, Zr and Te, and a film of mixture thereof. The cooling layer is laminated on one side of the insulating layer, and made of metal having higher thermal conductivity than that of the insulating layer and particularly small specific heat and high thermal conductivity, and Au and Sb are desirable. The substrate may be made of plastic, glass, etc. similar to that of the conventional recording medium. The recording, insulating and cooling layers are formed on the substrate by a thin film forming method such as a sputtering method, a resistance heat depositing method, an electron beam heat depositing method and an ion plating method, etc. |
