| 摘要 |
PURPOSE:To eliminate a vibration and a fluctuation of a dynamic pressure type bearing motor by adjustably preparing an angle between a rotary unit and a bearing. CONSTITUTION:A coil 6 generates an alternating magnetic field when a current flows to the coil, and a cylindrical member 3, a disc 4 and a magnet 5 rotate together. Fluid in the gap between the lower end face 3b of the member 3 and the upper surface 7a of a disc 7 generates high pressure by the pumping action of a groove G3, the member 3 is floated with respect to the disc 7, and axially supported. The disc 7 can be inclined at an arbitrary angle by adjusting an adjusting screw 9, and can also be fixed. Accordingly, the degree of right angle of the upper surface 7a of the disc 7 to a shaft 10 can be accurately set, and the lower end face 3b of the member 3 and the upper surface 7a of the disc 7 can be maintained completely in parallel with each other. |
