| 摘要 |
PURPOSE:To decrease a coefficient of friction between a sheet and a positioning member and to obtain a packaged flexible magnetic disk without deviating a device by equipping a protection layer in the vicinity of the central hole of the flexible magnetic disk. CONSTITUTION:A composition capable of radioactive polymerization is provided in the vicinity of the central hole of the flexible magnetic disk by letterpress printing, and then radial rays are irradiated to the composition to be cured, thereby forming the protection layer. The flexible magnetic disk provided with the protection layer formed in such a way can drop the coefficient of friction in the vicinity of the central hole, and can be packaged without deviating a disk drive device. Moreover by this method, the protection layer can be efficiently provided in the vicinity of the central hole with a high accuracy. |
