SPUTTERING TARGET FOR FORMING PHASE CHANGE OPTICAL DISC PROTECTIVE FILM AND OPTICAL RECORDING MEDIUM HAVING PHASE CHANGE OPTICAL DISC PROTECTIVE FILM FORMED USING THAT TARGET

摘要

The present invention relates to a sputtering target for forming a phase change optical disc protective film formed from a complex of chalcogenide and silicic oxide, characterized in that the sputtering target for forming a phase change optical disc protective film has, at least in the erosion portion, a texture which becomes 0.3≤A/B≤0.95 when the average length of silicic oxide in the normal line direction existing on the face within the range of -30 DEG SIMILAR +30 DEG against the normal line direction of the sputtering face is given as A and the average length in the vertical direction against the normal line is given as B. Obtained is a sputtering target formed from a complex of chalcogenide and silicic oxide capable of suppressing nodules, increasing the evenness of deposition, and improving the productivity, and which is effective in forming a phase change optical disc protective film, as well as an optical recording medium having formed thereon the phase change optical disc protective film using such a target.