| 摘要 |
PURPOSE:To attenuate a resonance characteristic and to reduce a mutual vibration transmission characteristic, by providing a screw section for a housing outer circumference and a base inner circumference respectively, and incorporating the two constituents by screw coupling. CONSTITUTION:A base 6 mounting an access mechanism and a spindle housing 7 holding bearings 8 making a spindle mounting a disc rotatable, are provided, and the outer circumference of the housing 7 and the inner circumference of the base 6 are tapped respectively, the screw coupling section 9 is formd with both screws so as to couple the base 6 and the spindle housing 7. Further, the base 6 and the spindle housing 7 are tightened with a bolt 10 and the access mechanism fixed on the base 6 and the disc spindle system are incorporated. If the base 6 shows the resonance mode, since the inner circumferential ridge for coupling of the spindle housing 7 is not on the same plane and the rigidity of the construction of the housing side screw coupling section is very large, the mode of deformation of the both is discontinuous, the friction is generated at the screw coupling section 9, allowing to obtain an attenuating effect. |
