| 摘要 |
A bearing device is used as a bearing for a pivot of a head stack assembly to thereby make a hard disc drive thin. Widths of first and second inner races 12a and 13a are set to be smaller than the widths of first and second outer races 12b and 13b. Even if first and second bearings 12 and 13 (outer races 12b and 13b) are mounted on a shaft 9 in contact with each other, a space S is formed between the first and second inner races 12a and 13a. From this structure, in the case where a pre-pressure is applied to the second inner race 13a, it is possible to adjust the pre-pressure in a wide range. In the prior art, it has been necessary to provide an annular projection or a spacer for keeping a space for application of the pre-pressure. However, the present invention makes possible to dispense with the annular projection or the spacer. Corresponding to this, the width of the bearing device 10 is shortened. Finally, the thickness of the pivot portion of the swing arm is decreased to thereby make the hard disc drive thin.
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