| 摘要 |
PURPOSE:To prevent exactly an inclination of a disk, and to prevent the generation of a trouble, when installing the disk, by forming a receiving part made of a porous metal which is positioned at a part contacting to the disk and has a minute hole, on a hub. CONSTITUTION:When a floppy disk 17 is set to a hub 10 and a rotor 3 is rotated, an engaging pin 13 coincides with an engaging hole 19 of a magnetic material disk 18 and is fitted into said hole, the magnetic material disk 18 becomes a state that it adhered closely to a receiving part 11, and the floppy disk 17 is installed to the hub 10. In this case, the upper face of the receiving part 11 slides against the magnetic material disk 18, but since the receiving part 11 is made of a porous metal and its frictional resistance is small, the floppy disk 17 is no turned with a hub 11 and the engaging pin 13 is fitted exactly into the engaging hole 19. Also, even if a minute foreign matte adhered to the magnetic material disk 18 of the floppy disk 17, the magnetic material disk 18 becomes a state that it adhered closely to the receiving part 11, and it does not occur that the floppy disk 17 is inclined and installed. |
