Patent ID: 9209668
Filing Date: 2015-12-08
Classification: G11B,H02K

Abstract:
1. A spindle motor comprising: a rotor to the central portion of which one end of a rotating shaft is coupled; a bearing that rotatably supports the rotating shaft; a bearing housing that accommodates the bearing in the inside of a groove and that is made of a resin; and a base plate whose inner circumferential portion is buried and combined in the inside of the bearing housing, wherein part of the base plate is in contact with the bearing to thus discharge externally introduced static electricity through the rotating shaft, the bearing, and the base plate, and wherein the base plate comprises a plurality of protrusions projected from the inner circumferential surface of a through-hole formed in the base plate, to increase a bonding force to the bearing housing when the base plate is insert-molded into the bearing housing, and wherein at least one of the plurality of protrusions is in contact with the bearing.