| 摘要 |
PURPOSE:To provide an optical information recording medium which can reduce the thickness of a recording layer film having a high reflectance and high contrast, carry out regeneration by a CD player, and carry out recording by a relatively little laser power CONSTITUTION:As for an optical information recording medium which is formed by laminating at least two of a dielectrics intermediate layer, phase transition type optical recording layer, dielectrics layer, and a reflection layer having each different refractive index in succession on a basic plate, the phase transition type optical recording layer consists of (GeTe)1-xalphax ((x) is a number of 0-0.1, alpha is at least one kind selected from among Sb, Se, Bi, and In) having a film thickness of 10-30nm, and the reflective. (calculated value) at the used laser wave length in the dielectrics intermediate layer is 30-60%, and the reflectance of the medium in the case where the recording layer in a disc mirror surface part is in a crystallization state is 65% or more, and the reflectance difference between a crystallized state and an amorphous state is at least 35%. |
