| 摘要 |
PURPOSE:To raise poductivity, and also to prevent a protective film from being damaged due to a corner burr by projecting part of the outside circumferential edge of substrate of a recording medium, in the outside diameter direction from the outermost circumference of the surface, and forming a protective a protective layer by extending this projected part. CONSTITUTION:A corner is chamfered so that about a center 1C of the outside circumferential edge of a substrate 1 is projected, for instance, by 0.2mm. in the outside diameter direction from the outermost circumference of one surface having a recording surface 2 of the substrate 1 and the other surface. In case of mold-forming the substrate 1, an undercut 14a is provided on the outside circumference ring 14 of a fixed metallic mold 13. When a depth of this undercut 14a is set to a size corresponding to a molding contraction coefficient of a resin, for instance, 0.2mm., the substrate 1 can be taken out of the metallic molds 11, 13. A metallic reflecting film 5 and a protective film 6 are struck to the upper face of this substrate 1. In this case, the protective film 6 is stuck so as to cover a corner burr 1b and to cover a corner chamfered part 1d. The circumferential edge part of the reflecting film 5 is covered with the protective film 6, and does not touch directly a circumferential atmosphere. Also, when sticking the reflecting film 5, it is unnecessary to use a mask, etc. |
