Patent ID: 8464284

Claim:
A disk rotation device, the device comprising: a bearing assembly including a bearing formed with a rotation shaft hole and a bearing housing that accommodates the bearing; a stator including a core secured at a periphery of the bearing housing and a coil wound on the core; a rotation shaft coupled to the rotation shaft hole; a rotor including a yoke secured at the rotation shaft and a magnet arranged at an inner lateral surface of the yoke facing a distal end of the core; and a turn table including a turn table body, which has a through hole, coupled to the rotation shaft, balls accommodated inside a circular trench of the turn table body and a cover member that blocks the trench, wherein a curve that line-contacts the balls is formed at an area where an inner lateral surface, which is arranged adjacent to the through hole, of the trench and a floor surface connected to the inner lateral surface of the trench meet and the floor surface is an upper surface of the trench so as to inhibit generation of noise and vibration, in case the turn table is aligned in a horizontal state, an inclined state, or a vertical state relative to a lying surface.