Patent ID: 8593758

Claim:
A spindle motor comprising: a stationary portion including a stator; and a rotating portion including a rotor magnet, and arranged to rotate with respect to the stationary portion through a lubricating oil; wherein the stationary portion includes: a shaft portion centered on a central axis extending in a vertical direction; an annular member fixed to an upper portion of the shaft portion in a tight-fitting condition; and a cap member being annular in shape, and including a radially inner end portion fixed to each of the shaft portion and the annular member through an adhesive; the rotating portion includes: a sleeve portion arranged to have the shaft portion inserted therein; and a seal defining portion arranged radially outward of the annular member to extend in an axial direction so as to be cylindrical or substantially cylindrical; an outer circumferential surface of the annular member and an inner circumferential surface of the seal defining portion are arranged to together define an upper seal gap therebetween, the upper seal gap including an upper seal portion defined therein, the upper seal portion including a surface of the lubricating oil arranged therein; the cap member is arranged to cover an axially upper side of the upper seal portion; and a lower end of a fixing region over which the shaft portion and the annular member are in contact with each other is arranged to be in contact with the lubricating oil, while an upper end of the fixing region is covered with the adhesive over an entire circumference or substantially an entire circumference thereof.