Method for producing a disk-shaped substrate and method for producing an optical disk
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKazuhiro Hayashi, Kazuya Hisada, Eiji Ohno
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Abstract
A method for producing a disk-shaped substrate 10 used for producing an optical disk includes: (a) forming a protective layer 12a that is larger in area than the disk-shaped substrate 10 on a surface of a transparent plate 11a; and (b) cutting a portion of the plate 11a with the protective layer 12a formed thereon other than an outer edge portion of the protective layer 12a to form a disk shape. According to this producing method, a thin substrate can be prevented from being damaged by forming a protective layer. Furthermore, according to this producing method, a protective layer with a uniform thickness can be formed.
Claims6
A method for producing optical disk including a first substrate and a second substrate in which a signal area is to be formed on one principal plane, comprising the processes of:
- (i) fixing the other principal plane of the second substrate, which is an opposite side of the one principal plane, to a support;
- (ii) forming at least one film selected from a metal film, a dielectric film, a magnetic film and a coloring film on the one principal plane;
- (iii) forming at least one film selected from a metal film, a dielectric film, a magnetic film and a coloring film on the one principal plane;
- (iv) attaching the first substrate and the second substrate to each other with the at least one film interposed therebetween;
- and
- (v) releasing the other principal plane of the second substrate from the support,
- wherein the processes are performed in an order of (i), (ii), (iii), (iv), and (v).
Dependencies are inferred from the claim text.