Patent ID: 7265939
Filing Date: 2007-09-04
Classification: F16C,G11B,H02K

Abstract:
1. A spindle motor comprising: a chassis; a rotor magnet; a rotor-side bearing member; a stator-side bearing member; a rotor hub having a hollow circular hole and disposed to the center of rotation; a support column secured to the chassis; and a stator armature having a wound coil and disposed to the chassis in a position confronting the rotor magnet; wherein the support column is disposed to the chassis in a manner to pass through the hollow circular hole in the rotor hub; wherein the chassis has a protruding portion in an area around the support column, and a height of the protruding portion is greater than a height of the stator-side bearing member; and wherein the rotor-side bearing member, in combination with the stator-side bearing member disposed to the chassis, forms a fluid bearing for supporting the rotor hub, wherein the support column, the rotor-side bearing member, the stator-side bearing member and the protruding portion are disposed in this order from a central axis, and the protruding portion is disposed outside the fluid bearing.