| 摘要 |
PURPOSE:To attain sure turning, by extending axially a spindle shaft inserted to a center hole of a center hub with a pressing force applied to the spindle at the loading of a magnetic disc. CONSTITUTION:The constitution is adopted that the center hole 2a of the center hub 2 of the magnetic disc 1 extends the spindle shaft 3a axially by using the pressing force applied to the spindle at the loading of the magnetic disc. Thus, even if there exists more or less error in the inner diameter of the center hole of the center hub, the magnetic disc is driven surely and the interchangeability of the disc is ensured. |
