Patent ID: 9613650
Date: 2017-04-04
CPC Classifications: B23K,G11B,H02K

Claim:
1. A disk drive with a spindle motor, comprising: a stationary portion including an armature and a base plate to which the armature is fixed; a rotating portion including a magnet, and arranged to rotate about a rotation axis with respect to the stationary portion; and a head portion that performs at least one of reading and writing of information from or to a disk supported by the rotating portion of the spindle motor; wherein the base plate is defined by press working, casting, or forging; the base plate includes: the head portion is positioned to rotate about an axis defined by a substantially columnar support, the substantially columnar support extending along a central axis and fitted to the hole portion by crimping, press fitting, or welding; the support fitting portion includes a melting mark defined at at least a portion of the recessed lower surface surrounding the support, the melting mark being depressed axially upward; and a central angle of the melting mark is in the range of 60° to 120°, both inclusive.