Nidec Corporation

Kiyofumi Inoue

Takahiro Nakamura

Kaoru Uenosono

Takayuki Ishino

Akihiro Yudate

Toshikazu Himeno

Katsutoshi Hamada

Shozo Tagata

Koji Baba

Akio Tatsumi

Takashi Fujiwara

A base plate of a disk drive apparatus includes a motor base disposed around a central axis and a base body portion extending radially outward of the motor base. The motor base is made of a metallic material of a first type. The base body portion is made of a metallic material of a second type. Thus, the axial thickness of a portion of the base plate close to the central axis can be significantly reduced and a reduction in the stiffness of the portion can be prevented. Further, the motor base includes a flange portion and a plastic deforming portion. The flange portion and the plastic deforming portion are respectively in contact with at least a portion of both axial end surfaces of an inner end portion of the base body portion. Thus, extraction of the motor base in the axial direction is prevented.

Base plate of motor including flange portion and plastic deforming portion and disk drive apparatus

A housing member for use in a disk drive apparatus includes a rectangular bottom portion and a side wall portion arranged to extend upward from an outer circumferential portion of the bottom portion. The side wall portion includes four outside surfaces including a first outside surface and a second outside surface perpendicular or substantially perpendicular to the first outside surface. The first outside surface includes a first cutting base region. The second outside surface includes a second cutting base region. The bottom portion includes a bearing fixing portion arranged to fix a bearing mechanism of a motor arranged to rotate a disk.

Housing member for use in disk drive apparatus, motor unit, disk drive apparatus, and method of manufacturing housing member

A method of manufacturing a fluid dynamic bearing in which a stopper is fixed by welding. The bearing comprises a hub, a shaft erected on the hub, a sleeve, a cylindrical wall erected on the hub, and the stopper mounted on the cylindrical wall. The method comprises a first step to hold oil in the bearing gap, and a second step to locate the stopper on the peripheral wall being apart from the interface of the oil to fix the stopper by LASER welding.

Method of manufacturing a fluid dynamic bearing applicable to a disk drive that includes welding a cover member to a cylindrical wall of a shaft base

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Kyoto, Japan

Kiyofumi Inoue