| 摘要 |
PROBLEM TO BE SOLVED: To provide a small-sized spindle motor especially with low overall height. SOLUTION: The spindle motor incorporates a rotor 6 with a shaft 8 coupled to a rotor's bell mouth portion 7, a cylindrical bearing sleeve 10 with a flange 11 at the opening area for housing of the shaft 8 on a feed hole, a stopper ring 14 fixed between the flange 11 and a base plate 13 at the inner diameter side of the rotor's bell mouth portion 7, and at least one radial bearing each of 15 and 16 employing a surface pattern structure which is formed between the outer diameter side of the shaft 8 and the inner diameter side of the bearing sleeve 10. This spindle motor is provided with a pan-shaped cabinet 12 at the bottom side of the pan-shaped bearing for housing the bearing sleeve 10 with one side of a fluid dynamic pressure bearing closed, and an annular thrust bearing 18 fixed between the flat bottom surface on the flange 11 and the flat top surface on the stopper ring 14. COPYRIGHT: (C)2006,JPO&NCIPI
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