Patent ID: 8189290
Filing Date: 2012-05-29
Classification: G11B

Abstract:
1. A spindle motor comprising: a shaft as arranged concentric with a central axis and extending in a vertical direction; a rotor unit arranged to rotate about the central axis, the rotor unit including a magnet arranged around the central axis; a stator unit including a base member; and a magnetic member fixed to the base member and axially opposed to the magnet; wherein the magnetic member includes an opposing portion axially opposed to the magnet so that a magnetic attracting force is generated between the opposing portion and the magnet and a protrusion portion protruding downwards from the opposing portion, and the base member includes a recess portion, the protrusion portion of the magnetic member being fixed within the recess portion; and the recess portion is defined by a channel including two opposed wall portions extending in parallel or substantially in parallel with the central axis such that the magnetic member is sandwiched by the two opposed wall portions by being arranged directly between the two wall portions in a radial direction.