| 摘要 |
PROBLEM TO BE SOLVED: To make radial dynamic pressure and thrust dynamic pressure higher, to remove fear of occurrence of precession, and besides to prevent unfavorable upward movement of a protrusion-side bearing member, in a dynamic air pressure bearing having conical dynamic pressure bearings. SOLUTION: The first conical dynamic pressure bearing of this spindle motor is composed of a protrusion-side bearing member 20 having a first conical protrusion 21a and a second conical protrusion 21b facing each other with a column section 22 between and having a cylinder 23 formed along a central axis, and a first recession-side bearing member 30 having a first conical recession 31 to be fitted to a second conical protrusion 21b without touching, and its radial dynamic pressure bearing is composed of a thin and long shaft 50 arranged piercing the cylinder 23 and a protrusion-side bearing member 20. Besides, its second conical dynamic pressure bearing is composed of a second recession-side bearing member 40 having a second conical recession 41 to be fitted to a second conical protrusion 21b without touching, and the protrusion- side bearing member 20. |
