| 摘要 |
PROBLEM TO BE SOLVED: To provide a disk driving device which can increase the permissible quantity of the positional shift between a centering projection part and the center hole of a disk and reduce a miss in centering to the centering projection part of the disk. SOLUTION: The centering projection part 16 has three swelling ribs 16a, 16b, and 16c formed radially from the center by removing parts A, B, and C from a rotary table; and the outer peripheral surface of each rib is a positioning surface 20 and a guide surface 19 is formed on it. In this case, the permissible quantity of the position shift between the disk center and rotary table center where centering is possible is up toδ1+δ2.
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