Minebea Mitsumi Inc.

Daisuke Ito

Hideaki Showa

Daigo Nakajima

Fumiyasu Higuchi

Shigeya Abe

A clamp member is a disk-shaped member configured to fix a recording disk to a rotating part of a spindle motor. The clamp member includes a clamp lower surface, a plurality of first through holes, and a plurality of second through holes. The clamp lower surface is provided in an outer edge region of the clamp member, contacts an upper surface of the recording disk, and applies a downward force to the upper surface. The first through holes are provided at a first interval in the circumferential direction in a first region at an inner side in the radial direction from the outer edge region, and fastening members to be fastened to the rotating part are inserted into the first through holes. The second through holes are provided at a second interval in the circumferential direction in a second region at the inner side in the radial direction from the first region, and the fastening members are inserted into the second through holes.

Clamp member and hard disk drive device

A spindle motor according to one aspect of the present disclosure includes: a hub; a yoke; a rotor magnet; and a stator. The hub is formed in a cup shape having a hub cylindrical part extending in an axial direction and a disk part extending radially inward from an end of the hub cylindrical part. The yoke being arranged on radially inward of the hub is formed in an annular shape having a yoke cylindrical part facing the hub cylindrical part and a yoke flange part facing the disk part and extending radially inward from the one end of the hub cylindrical part. The disk part includes an adhesive part with the yoke flange part being fixed via an adhesive and a peripheral groove being formed on radially outward of the adhesive part. The adhesive is not present on radially outward of the peripheral groove, and the hub cylindrical part and the yoke cylindrical part do not contact each other.

Growing community of inventors

Saku, Japan

Daisuke Ito