Nidec Corporation

Hirofumi Takayama

Tsuchitsugu Watanabe

Takashi Shimizu

Sho Fukuhara

Tomohiro Yokosawa

Hosei Kudou

Takashi Nishina

Masaaki Inagi

In a spindle motor, a cup portion of a base member includes a cylindrical portion and a bottom plate portion. The cylindrical portion is concentric or substantially concentric with a central axis extending in a vertical direction. The bottom plate portion closes a bottom portion of the cylindrical portion. The bearing mechanism is accommodated in the cup portion. An adhesive is arranged between an outer circumferential surface of the bearing mechanism and an inner circumferential surface of the cylindrical portion. At least one of the outer circumferential surface of the bearing mechanism and the inner circumferential surface of the cylindrical portion includes an axially extending vertical groove. A communicating hole which is not filled with the adhesive is arranged in at least a portion of an inside of the vertical groove. The communicating hole extends continuously from an upper to a lower end portion of the vertical groove.

Spindle motor and disk drive apparatus

A base unit includes a base member and a connector. The base member includes a bottom plate portion, a window portion, and a first groove. The first groove is defined in an upper surface of the bottom plate portion around the window portion. The connector includes a board portion and an electrode terminal. The board portion is arranged on the upper surface of the bottom plate portion to cover the window portion and the first groove. The electrode terminal is arranged to overlap with the window portion in the axial direction. An adhesive is arranged between the upper surface of the bottom plate portion and the lower surface of the board portion. The adhesive is arranged to extend continuously in an annular or substantially annular shape around the window portion while being arranged in at least a portion of the first groove.

Base unit, spindle motor, and disk drive apparatus

A gas is fed, so as to cause a gas flow to occur from a lower opening of a bearing hole of a sleevein an outward direction of an annular portionof a rotor hubvia a radial gapand an upper opening of the bearing hole, thereby lifting a rotor sectionIn a condition where the rotor sectionis lifted, the magnitude of run-out synchronized with the rotation of the rotor sectionis measured by using a displacement gaugeThen, based on the magnitude of run-out synchronized with the rotation, the run-out of the rotor sectionis adjusted.

Production method of fluid dynamic-pressure bearing in spindle motor

Growing community of inventors

Kyoto, Japan

Hirofumi Takayama