| 摘要 |
PROBLEM TO BE SOLVED: To improve the property by expanding the recording area, increasing the storage capacity, and suppressing reduction of a dielectrics film thickness near the mask edge and reduction of the reflection factor while avoiding corrosion when forming a plurality of dielectric films on a base plate. SOLUTION: The upper dielectric films 6 are formed after forming a reflection film 3, a lower dielectric film 4, and a recording film 5 sequentially on one main surface 2a of a disk plate 2. Two vacuum chambers are used to form the upper dielectric films 6. First, the 1st upper dielectric film 6a is formed in the 1st vacuum chamber, by carrying out masking using an inner mask and an outer mask. After removing the outer mask, the 2nd upper dielectric film 6b is formed in the 2nd vacuum chamber. Then, sticking a light transmissive protection layer 9 through an adhesive layer 8, an optical disk 1 is manufactured. |
