| 摘要 |
PURPOSE:To attain sure loading/unloading of a flexible magnetic disc and the like to a rotating body with easy operation without a complicated constitution, by clamping a hub of a disc shaped recording medium to the rotating body by means of an electromagnetic force. CONSTITUTION:A motor is constituted with an armature coil 20 and a magnet 19 of the rotating body 14 opposing to the coil 20 and the rotating body 14 is rotated incorporatedly with a shaft 10. In this rotating body 14, only a ring shaped section 18 provided opposingly to a ring shaped magnetic substance 17a of the hub 16 of a magnetic disc 15 is formed as a nonmagnetic substance, the other parts is formed as magnetic substance, and when power is applied to the coil 20, the hub 16 is linked and fixed to the rotating body 14 via the magnetic substance 17a and the like by means of electromagnetic adsorption. Thus, the loading/unloading between the rotating body and the flexible magnetic disc is executed surely with easy operation and a simple constitution without requiring any rotating clamping plate or the like. |
