Patent ID: 8564901

Claim:
A disk drive device, comprising: a hub on which a recording disk is to be mounted; a base rotatably supporting the hub through a bearing unit; a core fixed to the base, the core having a ring portion and a plurality of teeth that extend radially from the ring portion; coils wound around the plurality of teeth; a yoke fixed to the hub; and a magnet fixed to the yoke, the magnet being magnetized for driving with a plurality of poles along the circumferential direction and arranged to radially face the plurality of teeth, wherein the hub has a cylindrical separating wall that is in between the yoke and the recording disk in the case where the recording disk is mounted on the hub, and the yoke is fixed to an inner surface of the separating wall using both adhesion and press-fitting, and wherein a convex portion is formed on the inner surface of the separating wall, and the yoke is pressed against the convex portion in the case where the yoke is press-fit, wherein a surface of a central hole of the recording disk faces an outer surface of the yoke in a radial direction in the case where the recording disk is mounted on the hub, and wherein the separating wall intervenes between the surface of the central hole of the recording disk and the outer surface of the yoke, and wherein the convex portion touches the outer surface of the yoke to form a gap between the yoke and the separating wall, and wherein the gap holds glue.