| 摘要 |
PROBLEM TO BE SOLVED: To manufacture inexpensive optical disks with a high yield in a simple apparatus by forming a metallic film only at an area required for the optical disk which is layered in touch with a dielectric film on the whole surface of a disk substrate. SOLUTION: Dielectric films 2, 4 which are easy to peel off are formed all over the surface of a disk substrate 1. A retainer for holding an inner and an outer circumferences of the disk substrate when a film is formed is eliminated. A manufacturing apparatus becomes simple in structure and never invites a film separation when the inner and outer circumferences of the disk substrate are held and freed. Metallic films 3, 5 easy to corrode can be easily coated and protected by the dielectric films 2, 4 in touch therewith. When a masking retainer is used to form the metallic films 3, 5 in a predetermined shape, the metallic films are accumulated on a surface of the retainer as well. However, the metallic films are hard to separated even when a film thickness increases, and therefore defective products due to the film separation are less produced. |
