| 摘要 |
PURPOSE:To position a magnetic disk with high accuracy and to ensure the assured revolutions of the disk by setting an elastic matter for pressing a drive pin into a hole formed at a position shifted from the center of a center hub of the disk. CONSTITUTION:A square rotary shaft inserting hole 21 is formed to a center hub 13 of a magnetic disk 11 together with a drive pin inserting hole 23 formed at a position slightly apart from the hole 21. An elastic matter 24 which presses a drive pin 22 is set into the hole 23. While a magnet 26 is set on a support stage 25 for the hub 13. When the disk 11 is loaded, the pin 22 is pressed with the matter 24. Then the reaction of the pin 22 produces the press contacts between a rotary shaft 20 and two points 33 and 34 of the hole 21 respectively. Thus the disk 11 can be positioned in its radius direction with high accuracy. While the disk 11 is adsorbed by a magnet 26 in its axial direction. In such a way, the assured revolutions are obtained with the disk 11.
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