Disk drive device
AssigneeSamsung Electro-Mechanics Japan Advanced Technology Co., Ltd.
InventorsMitsuo KODAMA, Ryusuke SUGIKI
Life of this patent
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Abstract
A disk drive device comprises a chassis, an annular hub having an outer periphery on which a recording disk is to be mounted, and having an inner periphery to which an annular magnet is fastened, a fluid bearing unit that supports the hub in a manner freely rotatable relative to the chassis, an opposing wall formed annularly on the surface of the chassis at the hub side, and facing with at least partially the inner periphery of the hub in the radial direction, a first gap that extends in the axial direction between the inner periphery of the hub and the opposing wall, and a second gap that is continuous from the first gap and extends in the radial direction between the end face of the hub and the chassis.
Claims20
A disk drive device comprising:
- a chassis;
- an annular rotator having an outer periphery to be engaged with a recording disk, and having an inner periphery fastened with an annular magnet;
- a fluid bearing unit that supports the rotator in a manner freely rotatable relative to the chassis;
- an opposing wall that is formed annularly on a surface of the chassis at the rotator side, and faces with at least partially the inner periphery of the rotator in a radial direction;
- a first gap running in an axial direction between the inner periphery of the rotator and the opposing wall;
- and
- a second gap continuous from the first gap, and running in the radial direction between an end face of the rotator and the chassis.
The disk drive device according to claim. 5, wherein:
- the shaft body further comprises a shaft holder that holds a first end of the shaft;
- the shaft holder comprises a flange that holds the first end of the shaft, and faces with a first end of the sleeve with a gap;
- the shaft further comprises a shaft flange that faces with a second end of the sleeve with a gap;
- and
- the dynamic pressure generating groove further comprises a second dynamic pressure generating groove that is formed in at least either one of opposing surfaces of the shaft flange and the sleeve, and opposing surfaces of the sleeve and the flange.
The disk drive device according to claim. 6, wherein:
- the shaft holder further comprises a flange encircling part that protrudes from an outer periphery of the flange toward the rotator;
- the rotator comprises a sleeve encircling part that is fastened to the sleeve in a manner encircling the sleeve, and faces with the flange encircling part in the axial direction with a gap, and, an extended part that extends from the sleeve encircling part toward the flange, and enters in the flange encircling part;
- the shaft flange faces with an inner periphery of the sleeve encircling part with a gap in the radial direction;
- the extended part faces with an inner periphery of the flange encircling part with a gap in the radial direction;
- the gap between the shaft flange and the inner periphery of the sleeve encircling part forms a first capillary seal;
- and
- the gap between the extended part and the inner periphery of the flange encircling part forms a second capillary seal.
A disk drive device comprising:
- a chassis;
- a rotator that comprises a disk mount part, and an inner periphery to which a ring-shape magnet is fastened;
- and
- a fluid bearing unit that generates fluid dynamic pressure to a lubricant to support the rotator in a freely rotatable manner relative to the chassis, wherein:
- the rotator comprises a rotator opposing face that faces with the chassis in an area outwardly in a radial direction with respect to an inner periphery of the magnet;
- the chassis comprises a chassis opposing face that faces with the rotator opposing face with a first opposing gap;
- and
- a gas dynamic pressure generating groove that generates, when the rotator rotates relative to the chassis, dynamic pressure in a pump-in direction to gas present in the first opposing gap is provided in either one of the rotator opposing face and the chassis opposing face.
A disk drive device comprising:
- a chassis;
- a rotator that comprises a disk mount part, and an inner periphery to which a ring-shape magnet is fastened;
- and
- a fluid bearing unit that generates fluid dynamic pressure to a lubricant to support the rotator in a freely rotatable manner relative to the chassis, wherein:
- the rotator comprises a rotator opposing face that faces with the chassis in an area outwardly in a radial direction with respect to an inner periphery of the magnet;
- the chassis comprises a chassis opposing face that faces with the rotator opposing face with an opposing gap;
- a gas dynamic pressure generating groove that generates, when the rotator rotates relative to the chassis, dynamic pressure in a pump-in direction to gas present in the opposing gap is provided in either one of the rotator opposing face and the chassis opposing face;
- and
- the lubricant contains an ionic liquid.
Dependencies are inferred from the claim text.