| 摘要 |
PURPOSE:To inexpensively eliminate a vibration and a fluctuation of a dynamic pressure type bearing motor by constructing a bearing movably with respect to a rotary unit. 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 pressure generated in the fluid between the lower end face 3b of the member 3 and the upper surface 7a of the disc 7 is smaller, as the gap is larger. Accordingly, the disc 7 is altered at an angle to a shaft 1 so that the pressure of the fluid become uniform in all gaps, and the upper surface 7a of the disc 7 and the lower end face 3b of the member 3 becomes in parallel in all range. |
