| 摘要 |
PURPOSE:To prevent dust from being generated due to the damage of a magnetic disk, etc., by providing a ring-shaped synthetic resin buffer body for covering the surface to be pressed, and a synthetic resin buffer body for covering the outside peripheral surface of a spindle hub, on the peripheral part of the center hole of the magnetic disk. CONSTITUTION:Between a magnetic disk 4 being in a part which becomes the surface to be pressed of the peripheral part of a center hole 2 of a magnetic disk 4, namely, the lowest layer, and a flange part 511 of a spindle hub 51, between a sleeve 55 and each magnetic disk 4, and between the magnetic disk being on the uppermost layer and a clamp member 52, a first synthetic resin buffer bodies 61-66 are provided, and the whole is tightened and fixed with a clamp member 52 and a screw 54. Also, the whole of the outside peripheral surface of a magnetic disk inserting and attaching part 512 of the spindle hub 51 is covered with a second synthetic resin buffer body 7. In this way, the magnetic disk 4, a clamp device 5 and the sleeve 55 are not flawed, and generation of dust due to the damage is prevented.
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