| 摘要 |
PURPOSE:To regulate the reflectance of the crystalline part of a disk substrate with a pre-groove to >=65%. CONSTITUTION:A pre-groove (guide groove) 1a having 25nm depth and 0.8mum width is formed in the top of a substrate 1 at 1.6mum interval and a land is formed by the pre-groove 1a. Multilayered lower protective film 2, a recording film 3, an upper protective film 4 and a reflecting film 5 are formed on the substrate 1 with the pre-groove 1a to obtain the objective optical information recording medium 10. When this recording medium 10 is irradiated with light having prescribed wavelength and the reflectance is evaluated, the reflectance of the crystalline part is >=65%. |
