| 摘要 |
PROBLEM TO BE SOLVED: To provide a disk substrate with little wobbling and having excellent mechanical characteristics such as acceleration by a laminating method to prevent intrusion of air into a disk substrate face and an adhesive face. SOLUTION: The features of this laminated disk substrate are that an adhesive layer is formed to have the outer diameter larger than the outer diameter of the recording face formed on the disk substrate 1 and smaller than the diameter corresponding to the position where the thickness of a protective layer 2 suddenly increases just inside of the outer circumference of the disk substrate 1. The adhesive layer has the thickness twice or more as much as that of the increase amt. of the thickness of the protective film 2 in the outer circumference region. |
