| 摘要 |
PURPOSE: A disk rotation apparatus which prevents that a clamp magnet arbitrarily separates from a back yoke is provided to prevent the slip of an optical disk by pressurizing an optical disk by a clamp. CONSTITUTION: A turn table(200) is rotated with a rotary shaft(100). A center cone(300) is inserted into the rotary shaft. A receiving groove is formed in the center cone. A clamp magnet(400) is accepted within the receiving groove. A back yoke(500) includes a first back yoke unit, a second back yoke unit, and a third back yoke unit. The first back yoke unit is touched with the clamp magnet. The second back yoke unit is opposite to the inner side of the clamp magnet. |
