| 摘要 |
PROBLEM TO BE SOLVED: To suppress wobbling of an optical disk when the optical disk having "warp" is rotated. SOLUTION: A round shape magnet 12 being concentric with the optical disk is held at a magnet 11a provided at a lower surface of a clamper 11 clamping the optical disk 2 together with a turntable 6. An electromagnet 13 is provided at an upper part in a region of the magnet 12 held by the magnet 11a of the clamper 11. By such constitution, the round shape magnet 12 is placed concentrically on the optical disk 2, when electromagnetic force (repulsive power between the magnets) is operated to the magnet 12 from the electromagnet 13 of the upper side, the disk 2 is pressed through the magnet 12, the "warp" can be corrected, and wobbling of the optical disk 2 can be suppressed. COPYRIGHT: (C)2007,JPO&INPIT
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