Patent ID: 8737018
Filing Date: 2014-05-27
Classification: G11B

Abstract:
1. A spindle motor arranged to have a recording disk and a clamper mounted thereon, the spindle motor comprising: a rotating portion including a rotor hub and a rotor magnet including the rotor hub fixed thereto, and arranged to be rotatable about a central axis; and a stationary portion including a stator arranged opposite to the rotor magnet; wherein the rotor hub includes: an outer circumferential portion of the hub cylindrical portion includes a hub screw portion arranged to have the clamper screwed thereto; the hub screw portion includes at least: the outer circumferential portion of the hub circular plate portion includes a hub slanting surface arranged to connect with the first hub screw groove; and a length of the hub slanting surface is longer than a length of the upper flank.