| 摘要 |
PROBLEM TO BE SOLVED: To obtain good characteristics of repeated recording and erasing by using a combination of a protective film comprising a mixture film containing ZnS and SiO2 , and a recording film comprising a chalcopyrite-type compd., and incorporating nitrogen into the protective film. SOLUTION: The optical recording medium 1 consists of a substrate 2, and a first protective film 3, a recording film 4, a second protective film 5, a reflecting film 6 and a lacquer phase 7 deposited in this order. The recording film consists of an alloy selected from Au-In-Sb-Te alloy. Ag-In-Sn-Te alloy, Cu-In-Sb-Te alloy and Pd-In-Sb-Te alloy. The first and second protective films consist of mixture films containing ZnS and SiO2 , and at least one of the protective films contains nitrogen. The optical recording medium having the structure above described shows higher mechanical strength of the protective films due to the addition of nitrogen, and therefore, deterioration in the protective films by repetition of heating and cooling for recording and erasing can be suppressed. Also, diffusion of elements in the protective films which give bad influences on the recording film can be suppressed. |
