Patent ID: 8780492

Claim:
A spindle motor comprising: a fluid dynamic pressure bearing assembly; a base member coupled to the fluid dynamic pressure bearing assembly; and a core fixedly coupled to the base member and having a coil wound therearound, wherein the base member has a disk portion and a coupling portion extending from an inner edge of the disk portion upwardly in an axial direction, one surface of the core is in contact with an outer circumferential surface of the overall coupling portion, and an upper end of the coupling portion is protruded upwardly, relative to an upper surface of the core, and the fluid dynamic pressure bearing assembly comprises a shaft having a body portion, an extending portion extending from an upper portion of the body portion outwardly in the radial direction, and a protrusion portion extending from an outer edge of the extending portion in an axial direction; a sleeve rotatably supporting the shaft; and a cover plate coupled to the sleeve, while maintaining a gap with regard to the shaft and a lower portion of the sleeve, wherein the fluid dynamic pressure bearing assembly further comprises a rotor having a hub base coupled to the extending portion so as to be rotatable in conjunction with the shaft and a stopper portion extending from the hub base such that the stopper portion faces an outer circumferential surface of the sleeve.