| 摘要 |
PURPOSE:To improve the positioning accuracy of a disk and at the same time to prevent the damage of the disk which is caused by frequently attaching and detaching the disk, by connecting a driving shaft to a disk hub via a ball which is energized with the elastic force of a spring. CONSTITUTION:The center part of a disk 1 stored in a protecting case 2 is reinforced with a hub 7 of a metallic material which has a center hole of a small diameter. When the disk 1 is attached to a using device 5, a ball 9 energized with the elastic force of a spring 10 is fitted to the center hole. Thus a driving shaft 8 is connected to the hub 7. With such constitution using a center hole of a small diameter and a ball, the positioning accuracy of a disk is improved. In addition, the damage caused by the frequent attachment/detachment of the disk can be prevented for the center part of the disk. |
