Nippon Densan Corporation

Masanobu Chuta

Hiroyuki Yonei

Kihachiro Ohta

Kuniyasu Iwazaki

Tokumon Ogawa

Yuji Morioka

Hideki Nishimura

Yoshio Fujii

Kazuyuki Yasuda

Yoshikiyo Nagashima

A disk drive apparatus in which a hard disk is fitted on a disk-fitting outer peripheral portion of a rotor hub. A gap is defined on the outer periphery of the rotor hub such that the axial height of the gap decreases radially inward. An elastic ring member, which is appropriately tensed in the circumferential direction, fits in the gap so as to exert a contracting force which serves to clamp the hard disk between itself and a disk supporting surface. The hard disk can be securely and easily fixed to the rotor hub with uniform application of the clamping pressure over the entire circumference, even when the axial height of the whole disk drive apparatus is reduced.

Disk clamping assembly for a low profile disk drive apparatus

A spindle motor comprises a stationary member, a hub for rotation relative to the stationary member, bearings provided between the stationary member and the hub, and a labyrinth seal provided outside one of the bearings. In particular, the labyrinth seal includes a plurality of labyrinth units. Each labyrinth unit is consisted mainly of a first member mounted to the stationary member and a second member mounted to the hub.

Spindle motor with labyrinth sealed bearing

A spindle motor having a housing, a hub member rotatable relative to the housing, a bearing disposed between the housing and the hub member, a rotor magnet mounted on the hub member, and a stator disposed in a facing relationship with the rotor magnet. The hub member includes a supporting wall portion, which cooperates with the stator to constitute an air seal structure. A magnetic fluid seal is provided at a position outward of the bearing, and includes a conductive plate for grounding static electricity. The bearing is comprised of a radial ball bearing, which includes certain improvement.

Spindle motor with the stator core supported by a resin member

Disclosed is a spindle motor comprising: a housing, a hub member which is rotatable with respect to the housing and to which a recording member is attached, and a bearing arranged between the housing and the hub member and having an outer member which is rotatably attached thereto through the intermediation of a plurality of spherical members, the hub member being fixed to the above-mentioned outer member by press fitting or shrinkage fitting, and the inner periphery of the hub member being equipped with an annular recess in correspondence with a ball lodging grooved formed on the outer member.

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Naka, Japan

Masanobu Chuta