| 摘要 |
PURPOSE:To improve the electric characteristic such as the C/N by selecting a base adhering member for a hub and making melting point lower than that of the base. CONSTITUTION:A hub 1 is made of a resin made ring 3 and a metallic plate 4 and the ring 3 is welded on an inner side circumferential face of a magneto- optical disk 2. In order to manufacture the optical disk 2 provided with the hub 1, a thermoplastic resin with a lower melting point than that of an optical disk base is used as material of the resin made ring 3. Thus, the adhered part 3 of the hub 1 is molten with priority and no distortion is caused in the inside of the base before and after the welding state. Thus, the electric characteristic such as C/N is improved. |
