Patent ID: 7915774

Claim:
A spindle motor comprising: a base; a bearing housing installed on the base; a bearing fixed inside the bearing housing; a rotation shaft rotatably installed into the bearing; a stator disposed around the bearing housing; a bushing coupled to the rotation shaft, wherein the bushing has a substantially uniform thickness in a radial direction; a rotor coupled to the bushing to rotate through interaction with the stator, wherein the rotor comprises a rotor yoke coupled to the bushing and a magnet coupled to the rotor yoke, wherein the rotor yoke contacts the outermost periphery of the bushing; and a clamp coupled to the rotor yoke, wherein the bushing is spaced from the clamp, wherein an uppermost surface of the bushing is lower than an uppermost surface of the clam, and wherein a lowermost surface of the bushing is higher than a lowermost surface of the clamp.