Patent ID: 7581234

Claim:
A turntable assembly of a spindle motor, comprising: a turntable; and a back yoke installed on the turntable, wherein the turntable includes at least one of a turntable coupling protrusion and a protrusion coupler formed thereon, and the back yoke includes at least one of a protrusion coupler and a coupling protrusion formed thereon to face the at least one turntable coupling protrusion and protrusion coupler formed on the turntable, and the coupling protrusion is inserted in the protrusion coupler, for fixing the back yoke to the turntable, wherein the back yoke includes a through-hole, a connecting portion formed around the through-hole and a body formed around the through-hole and having a radial thickness greater by a predetermined amount than a radial thickness of the connecting portion, wherein the connecting portion includes the at least one of the turntable coupling protrusion and a protrusion coupler, wherein the coupling protrusion is rotated and inserted in the protrusion coupler, and wherein the protrusion coupler comprises a projection that is abutted against the coupling protrusion for coupling the coupling protrusion to the protrusion coupler.