Magnetic disk apparatus having a bracket with reinforcement plate

Abstract

There is provided a magnetic disk apparatus wherein a hub is rotatably mounted on a hub holder of a bracket via bearings. A stator core and a motor coil are mounted on the outer side of the hub holder, and a yoke and magnet are mounted on the hub, thereby constituting a spindle motor. A magnetic disk is placed on a flange provided at one end portion of the hub. The disk is fixed between the flange and a disk clamper with a spacer interposed between the clamper and the disk. The bracket is formed of aluminum or a plastic material. A reinforcement plate made of an ion-based material or a ceramic material on a bottom surface of the bracket. Since the reinforcement plate is attached to the bracket, the rigidity of the bracket and the rigidity of the motor disk assembly can be increased without increasing the thickness of the bracket.

Dependencies are inferred from the claim text.