Patent ID: 9001460
Filing Date: 2015-04-07
Classification: F16C,G11B,H02K

Abstract:
1. A spindle motor comprising: a stationary portion including a shaft arranged along a central axis which extends upward and downward, and a first cup portion; and a rotating portion that is rotatable about the central axis around the shaft; wherein the first cup portion includes a circular plate member and an annular member that is mounted on the circular plate member; a lower end of the annular member defines at least a portion of a lower end portion of the first cup portion; the rotating portion includes: wherein a lubricant is interposed in a gap between a surface of the stationary portion and a surface of the rotating portion; the shaft, the rotating portion, and the lubricant define a fluid dynamic pressure bearing; the outer circumferential surface of the first cup portion faces the second inner circumferential surface of the rotating portion via a seal gap that is a radial direction gap; an upper liquid surface of the lubricant is positioned in the seal gap; and a connection gap that reaches an inner side of the first cup portion from the outer circumferential surface of the first cup portion is configured between the circular plate member and the annular member and at least a portion of the connection gap is filled with an adhesive.