OPTICAL INFORMATION RECORDING MEDIUM, METHOD OF MANUFACTURING THE MEDIUM, AND TARGET USED FOR MANUFACTURING THE MEDIUM

摘要

A first protective layer (2) provided under the recording layer (3) of a phase changing type optical disk and a second protective layer (4) provided over the recording layer (3) are made of a material containing crystalline glass (for example, a mixture of 80 wt.% ZnS and 20 wt.% crystalline glass). Consequently, the protective layers (2 and 4) are hardly deformed even when the layers (2 and 4) are subjected to thermal loads due to the repetition of recording and erasure, because the heat resistances of the layers (2 and 4) are improved. Therefore, the repeatability of the phase changing type optical disk is improved.