| 摘要 |
PURPOSE:To improve reliability by forming combined layers of high-refractive index layers of adequate film thicknesses on a transparent substrate, thereby obtaining a high reflectivity. CONSTITUTION:The combinations of the high-refractive index layers 2 consisting of silicon, germanium, etc., and the low-refractive index layers 3 consisting of silicon oxide, magnesium fluoride, etc., are formed in >=1 layers on the transparent substrate 1. The reflecting layers consisting of the respective layers generate multiple interferences in this way. The phases coincide and the reflectivity can be increased up to about 100% when the film thicknesses of the respective layers are selected at adequate values. There is, therefore, no need for forming the reflecting films consisting of Al, Au, etc., directly on the transparent substrate and the optical recording medium having the high reliability is obtd. |
