Minebea Company, Limited

Minebea Mitsumi Inc.

Fumiyasu Higuchi

Toshimitsu Horiuchi

Daisuke Ito

Naoyuki Kondo

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 fluid dynamic pressure bearing device includes a first capillary seal () formed between an outer circumferential surface of a bearing memberand an internal circumferential surface of a seal member (). A second capillary seal portion () is formed between an outer circumferential surface of a shaft member () and a protrusion hole () of the seal member (). A ventilation hole () is formed in a substantially intermediate portion of a side wall of the seal member. A lubricant holding gap () is formed between an inner surface of a top wall () of the seal member () and the upper end surface of the bearing member (). Leakage of lubricant () is suppressed by action of the capillary seal portions (), and the liquid surface is positioned in the first capillary seal portion () above the ventilation hole (), whereby extra lubricant () is filled in the first capillary seal portion () and the lubricant holding gap ().

Growing community of inventors

Kitasaku-gun, Japan

Fumiyasu Higuchi