Nippon Densan Corporation

Takeshi Uda

Hiroyuki Yonei

Itsuo Miyaji

Shinichi Iwagaki

A spindle motor, a hub member for carrying a recording disk(s) thereon, a shaft member fixedly mounted to the hub member, and a bracket member rotatably supporting the shaft member. A pair of bearings each have inner and outer races fixed respectively to the bracket member and the hub member. First and second annular recesses relieve pressure on the bearings and also carry adhesive fixing the beatings in position.

Spindle motor with combined pressure relief and adhesive carrying

A magnetic recording device exhibiting reduced electromagnetic interference has a magnetic recording medium, a spindle motor for rotationally driving the magnetic recording medium, a magnetic head for writing and/or reading magnetic information and a shifting device for shifting the magnetic head. A stator core is provided with nine pole pieces divided into three groups of adjacent pole pieces. Each group of three adjacent pole pieces is wound with one of three different 3-phase coils such that adjacent pole pieces in a group have opposite polarities relative to a rotor magnet. The magnetic head is disposed corresponding to a specific slot of a stator core in the spindle motor. A shift route thereof extends outwards virtually in the radial direction from the specific slot.

Magnetic recording device having reduced electromagnetic interference

A spindle motor includes a bracket, a shaft member fixed to the bracket, a hub member rotatably mounted on the shaft member with a bearing member therebetween, a rotor magnet mounted on the hub member, a stator disposed in opposed relation to the rotor magnet, and a magnetic fluid sealing assembly disposed on on outer side of the bearings. The shaft member has an elastic sealing member which seals a through-hole formed in the shaft.

Spindle motor

A spindle motor includes a bracket, a shaft member fixed to the bracket, a hub member rotatably mounted on the shaft member with a bearing member therebetween, a rotor magnet mounted on the hub member, a stator disposed in opposed relation to the rotor magnet, and a magnetic fluid sealing means disposed on an outer side of the bearing means. The shaft member or bracket has a magnetized portion for suppressing a magnetic flux leaking from a magnetic fluid retaining means of the magnetic fluid sealing means.

Growing community of inventors

Kyoto, Japan

Takeshi Uda