| 摘要 |
<p>A disk-shaped optical information recording medium (115) includes a substrate (101), first to nth information layers (102 - 104) layered upon the substrate (where n is an integer of 3 or more), kth intermediate layers (105, 106) provided between a kth information layer and a (k + 1)th information layer (where k = 1, 2, and so on up to n-1), and a protective layer (107) provided upon the nth information layer. The fluctuation range of the thicknesses from the protective layer surface (107a) to each of the information layers (102 - 104) is no more than ±3 µm relative to the average value of the thicknesses within a range from a radius of 23 mm to 24 mm from the center of the optical information recording medium.</p> |
