| 摘要 |
PURPOSE:To stably clamp a disk by adhering an attraction hub of a disk and a magnet buried in a turntable together with their counter faces formed into wave shapes. CONSTITUTION:A ring-shaped magnet 12 buried in a turntable surface 10a of a turntable 10 and an adsorbing hub 9 of a disk substrate 8 have the counter wave-shaped faces 9a and 12a respectively in the circumferential direction of a disk 7. When the hub 9 is attracted by the magnet 12, the clamping force is fixed since no gap exists between the hub 9 and the magnet 12. Thus the disk 7 is stably clamped with no slip produced when the revolution of the disk 7 is started and stopped.
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