| 摘要 |
<p>[PROBLEMS] When reflectance values from respective layers are almost identical, the reflectance values are set below a predetermined value, thereby greatly suppressing the relative light reception ratio of interference light. [MEANS FOR SOLVING PROBLEMS] The reflectance of each recording layer is set so that intensity ratios of the reflected lights from respective recording layers specified with reference of the intensity of the incident light on the light incident surface are almost identical and the reflectance R<SUB>n-1</SUB> of the (n-1)-th layer preceding by one, the n-th layer which is farthest from the light incident surface and the reflectance R<SUB>n-2</SUB> of the (n-2)-th layer preceding the n-th layer by two are specified so that they satisfy the relationship R<SUB>n-1</SUB> × R<SUB>n-2</SUB> = 0.03.</p> |
