| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball bearing capable of preventing the natural oscillation frequency and the mean value from largely dispersing and further efficiently preventing resonance when it is assembled in a device. SOLUTION: The radius of curvature R1, R2 of the track in the dimensional ranges A1, A2 at least 45% of the track widths B1, B2 from the axial centers 11a, 21a in respective sides putting the axial centers 11a, 21a of respective tracks 11, 21 of the outer and inter rings 11, 21 inward, are designed within the range of±1μm against the average radius of cuverture of a track in the dimentional ranges A1, A2.
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