Patent ID: 7563030

Claim:
A method of making a fluid dynamic bearing, the fluid dynamic bearing having an inner peripheral surface with a plurality of dynamic pressure generating grooves formed therein, the method comprising the steps of: forming at least two bearing parts each comprising a joint plane and defining a part of the dynamic pressure generating grooves therein; combining the at least two bearing parts together with the joint planes contacting with one another to preliminarily form a profile of the fluid dynamic bearing having the dynamic pressure generating grooves therein; and sintering the combined at least two bearing parts to form an integral body to obtain the fluid dynamic bearing; wherein the fluid dynamic bearing has a cylindrical shape, the joint planes of each fluid dynamic bearing part are formed at two side thereof in a radial direction and extend along an axial direction of the fluid dynamic bearing, and the at least two bearing parts are joined with one another along a radial direction of the fluid dynamic bearing in the combining step.