Low profile hard disk apparatus
AssigneeNippon Densan Corporation
InventorsKiyoyoshi Takegami, Itsuo Miyaji, Hiroyuki Yonei, Kihachiro Ohta
Life of this patent
Estimating the term…
Abstract
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.
Claims13
A hard disk apparatus comprising:
- a base;
- a cover member defining a disk chamber in cooperation with the base;
- a spindle motor disposed in the disk chamber;
- a hard disk to be rotated by the spindle motor;
- a circuit substrate to control the spindle motor, the circuit substrate defining a hole to surround the spindle motor;
- a hollow cylindrical portion extending in a direction transverse to that of surfaces of the base and the cover member, the cylindrical portion having an inner portion defining an axially extending armature recess opening for supporting a shaft of a spindle motor;
- a projection portion provided on the base and concentrically surrounding the cylindrical portion, the projection portion extending downwardly relative to the base and in a direction parallel to that of the cylindrical portion, the projection portion and the cylindrical portion cooperating with one another to define an annular recess;
- the spindle motor comprising a shaft extending through the armature recess, a pair of bearings for rotatably supporting the shaft, a rotor hub to rotate with the shaft and to support the hard disk, field means mounted on the rotor hub, and an armature mounted on an outer portion of the cylindrical portion, the armature being in opposition to the field means;
- and
- the annular recess accommodating the pair of bearings, the field means, the armature, and a substantial portion of the shaft to reduce the height of the hard disk apparatus in an upward/downward direction.
A hard disk apparatus comprising:
- a base;
- a cover member defining a disk chamber in cooperation with the base;
- a spindle motor disposed in the disk chamber;
- a hard disk to be rotated by the spindle motor;
- a hollow cylindrical portion extending in a direction transverse to that of surfaces of the base and the cover member, the cylindrical portion having an inner portion defining an axially extending armature recess opening for supporting a shaft of a spindle motor;
- a projection portion provided on the base and concentrically surrounding the cylindrical portion, the projection portion extending downwardly relative to the base and in a direction parallel to that of the cylindrical portion, the projection portion and the cylindrical portion cooperating with one another to define an annular recess;
- the spindle motor comprising a shaft extending through the armature recess, a pair of bearings for rotatably supporting the shaft, a rotor hub to rotate with the shaft and to support the hard disk, field means mounted on the rotor hub, and an armature mounted on an inner portion of the cylindrical portion, the armature being in opposition to the field means;
- and
- the annular recess accommodating the pair of bearings, the field means, the armature, and a substantial portion of the shaft to reduce the height of the hard disk apparatus.
Dependencies are inferred from the claim text.