Nippon Densan Corporation

Kiyoyoshi Takegami

Itsuo Miyaji

Hiroyuki Yonei

Kihachiro Ohta

Noriaki Hishida

Yoichi Mori

Mineyo Endo

Hirotada Itoi

A low airflow hard disk apparatus comprises a base, a cover member, a rotational portion disposed in a disk chamber, a hard disk held by and rotatable with the rotational portion, a first projection portion disposed on the lower surface of the cover member and facing toward the upper surface of the hard disk, and a second projection portion disposed on the upper surface of the base and facing toward the lower surface of the hard disk. The first and second projection portions, preferably radially extending fins, prevent an air flow from generating by the rotation of the hard disk.

Low airflow hard disk apparatus

An annular recess is formed in a base which constitutes a disk chamber, and an armature constituting a spindle motor for driving a hard disk and composed of a stator core and a stator coil and a field device composed of a rotor yoke and a rotor magnet are substantially accommodated in the annular recess. As a result, the height of a portion of a hard disk apparatus which constitutes a radial directional gap type spindle motor can be minimized and therefore the overall height of the apparatus can be minimized. Hence, the thickness and the size of a computer apparatus or the like which includes the hard disk apparatus can be reduced.

Low profile hard disk apparatus

A magnetic fluid seal assembly comprising an annular sealing clearance communicating with an external space, an annular permanent magnet for forming a magnetic field in the sealing clearance, a ferromagnetic fluid retained in the sealing clearance by the magnetic field but rotationally movable in the sealing clearance, and a scattering preventive portion provided axially outwardly of the sealing clearance for preventing the ferromagnetic fluid from scattering to the external space when the ferromagnetic fluid is rotationally moved.

Magnetic fluid seal assembly

Growing community of inventors

Omihachiman, Japan

Kiyoyoshi Takegami