Nidec Corporation

Hirokazu Shirai

Kazuyoshi Saito

Yoichi Sekii

Hideki Nishimura

Junya Mizukami

Atsushi Yawata

Shigeki Nakatani

A spindle motor includes a stationary portion and a rotating portion. The rotating portion includes a magnet arranged around a central axis extending in a vertical direction. The stationary portion includes a base member and a magnetic member arranged below the magnet and fixed to the base member. The base member includes an upper surface extending out perpendicularly or substantially perpendicularly to the central axis, and a wall surface extending in an axial direction. The magnetic member includes an annular plate portion arranged on the base member and a projecting portion arranged to extend downward from the plate portion. At least a portion of the projecting portion is arranged to be in contact with the wall surface. An adhesive is arranged between the plate portion and the upper surface of the base member and between the projecting portion and the wall surface.

Spindle motor including magnetic member and disk drive apparatus including same

A stationary portion of a spindle motor includes a base member and a magnetic member. The magnetic member is arranged below a magnet and fixed to the base member. The magnetic member includes an annular plate portion arranged on an upper surface of the base member, and a projecting portion arranged to extend from the plate portion in an axial direction. At least a portion of the projecting portion is press fitted to a wall surface of the base member.

Spindle motor including annular magnetic member and disk drive apparatus including such a spindle motor

A bearing device includes a shaft, a sleeve and a thrust plate. The shaft includes a convex portion having a curved surface provided at one end thereof. The sleeve includes an inner circumferential surface opposed to an outer circumferential surface of the shaft. The thrust plate includes a concave portion having a curved surface and arranged to make contact with the convex portion of the shaft. The shaft is supported by the sleeve and the thrust plate such that it may rotate about the central axis with respect to the sleeve and the thrust plate. A curvature radius of the concave portion is greater than a curvature radius of the convex portion but equal to or smaller than about 2.0 times of the curvature radius of the convex portion.

Growing community of inventors

Kyoto, Japan

Hirokazu Shirai