| 摘要 |
PURPOSE:To improve the space efficiency, to scale down a device and to prevent dust from attaching to the surface of a magnetic disk by providing a filter in the center part of a core part into which the magnetic disk is loaded. CONSTITUTION:When the magnetic disk 8 rotates at a high speed, air around the surface of the magnetic disk 8 is rotated by centrifugal force and simultaneously flows outside. Since the pressure of a space formed between a core member 5 and the outer periphery of the projecting part of a frame in the center part is lower, air is sucked from the bottom of the space. The air flows out along the surface of the magnetic disk 8 through a hollow part 5a parabolically provided along the entire periphery of a cylindrical wall part of the core member 5 and the hollow part 7a where the magnetic disk 8 and a spacer 7 are alternately inserted. As the hollow part 5a is provided with the air filter 6, it removes a fine dust contained in a circulating air.
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