Patent ID: 8427779

Claim:
A disk drive device, comprising: a rotor on which a recording disk is to be mounted; a base having a bearing hole, the center of which is along the rotational axis of the rotor; and a bearing unit rotatably supporting the rotor with respect to the base, the bearing unit being glued in the bearing hole, wherein a ring-shaped first groove, the center of which is along the rotational axis, is arranged on a side surface of the bearing hole, wherein a ring-shaped second groove, the center of which is along the rotational axis, is arranged on a cylindrical surface of the bearing unit, the cylindrical surface contacting the side surface of the bearing hole, wherein the position of the second groove with respect to its direction along the rotational axis is different from the position of the first groove with respect to its direction along the rotational axis, wherein the base and the bearing unit are electrically connected by a conductive resin applied along an edge portion of the bearing hole, the edge portion being on a second surface of the base that is on the opposite side of a first surface of the base on which the rotor is arranged, wherein the first groove is filled with a glue, and the second groove is filled with a glue that is the same as that filled in the first groove, wherein the glue that exists between the bearing hole and the bearing unit has a volume that is comparable to the sum of the first groove's volume and the second groove's volume, and wherein at least a part of the conductive resin is applied onto a portion of the glue overflowing onto the second surface of the base.