DYNAMIC PRESSURE FLUID BEARING DEVICE

摘要

A dynamic pressure fluid bearing device capable of increasing a rotation accuracy and reducing an NRRO by eliminating the inclination of the centerline of a shaft relative to the centerline of a sleeve during the rotation, characterized in that the bearing lengths (L1) and (L2) of radial bearing parts are differentiated from each other, and at least the groove depths of dynamic pressure generating grooves, groove angles formed by the angles of the grooves relative to the radial direction of the shaft, and groove width ratios [a/(a+b)] as the ratios of groove widths (a) to the sums (a+b) of the groove widths (a) and ridge widths (b) are differentiated from each other at the plurality of radial bearing parts.