| 摘要 |
PURPOSE:To lower the limit of tracking capacity of a reproducing device and to remove wow and flutter easily by eliminating eccentricity engaging the lower edge of the hole of a disk tightly with the part of the same diameter of the conical face of a sliding body. CONSTITUTION:The upper face 5' of a flange 5 is perpendicular to a rotation shaft 2. The diameter of the lower end of the conical face 7 of a sliding body supported slidably by the rotation shaft 2 is larger than the maximum diameter of the hole 3 of a disk 4, and the diameter of upper end is smaller than the minimum hole diameter. The sliding body 6 is energized upward by a spring 8, and upward sliding is restrained by a stopper 9. When a set screw 11 is turned and the disk 4 is held between the flange 5 and a pressing body 10, the disk 4 is fixed surely in a plane perpendicular to the rotation shaft. Accordingly, the whole eccentricity can be reduced even when the tolerance of diameter of the hole 3 of the disk 4 is enlarged.
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