Patent ID: 9330728
Filing Date: 2016-05-03
CPC Classification: G11B

Claim Text:
1. A spindle motor for use in a disk drive apparatus including a cover member to be attached to the spindle motor, the spindle motor comprising: a rotor portion arranged to rotate about a central axis extending in a vertical direction, and including a rotor magnet; a bearing portion arranged to support the rotor portion such that the rotor portion is rotatable about the central axis; a stator portion arranged opposite to the rotor magnet; and a base portion molded by casting, and arranged to contain the rotor portion, the bearing portion, and the stator portion; wherein the base portion includes a plate portion arranged to extend radially with respect to the central axis, and a wall portion arranged to extend in an axial direction from a radially outer edge of the plate portion; the wall portion includes a hole portion in which an attaching member to attach the cover member to the spindle motor is arranged, and is arranged to support at least a portion of the cover member; an inside surface of the base portion includes a metal surface subjected to a cutting process; the base portion includes a recessed portion arranged between the metal surface and the hole portion; and the recessed portion is recessed either upward or downward in the axial direction, and is arranged to overlap with at least one of the metal surface and the hole portion when viewed in a horizontal direction perpendicular to the central axis.