US 7,474,502 B2Granted

Rotor hub, motor, and recording disk driving device

AssigneeNidec Corporation

InventorsTakehito Tamaoka, Shingo Suginobu

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Abstract

A rotor hub for use in a motor installed into a recording disk driving device to spin a recording disk includes a convex portion, a disk placing portion around the convex portion, and the relief portion which is a substantially circular concave portion disposed between the convex portion and the disk placing portion. The recording disk, preferably a 1.8-inch or smaller type disk, having a center circular through-hole, is mounted on the rotor hub. When the recording disk is mounted on the rotor hub, with the bottom surface thereof abutting against a portion of the disk placing portion and an inner side surface of the center circular through-hole of the recording disk, an upper edge of the relief portion is arranged axially lower than an upper edge of the inner side surface of the center circular through-hole, and a bottom edge of the relief portion is arranged inward from an inner edge of the bottom surface of the recording disk.

Claims14

Dependent claims

A rotor hub for use in a motor installed in a recording disk driving device to spin a recording disk, to which the recording disk including an inner side surface along a center circular through-hole is arranged, the rotor hub comprising:

a convex portion engaging the center circular through-hole of the recording disk;
a disk engaging surface defined by an outer side surface of the convex portion, a portion thereof engaging the inner surface of the circular center opening of the recording disk;
a disk placing portion, arranged around the convex portion, on which the recording disk is placed;
a disk placing surface defined by a portion of an upper surface of the disk placing portion, at least a portion of the disk placing surface abutting against a bottom surface of the recording disk;
a relief portion defined by a substantially circular concave portion extending inwardly from the disk engaging surface, and arranged between the disk placing surface and the disk engaging surface along the convex portion;
and
an upper edge of the relief portion provided between the relief portion and the disk engaging surface, and opposing the inner side surface of the recording disk;
wherein
the upper edge of the relief portion is arranged lower than an upper edge of the inner side surface along the center circular through-hole of the recording disk.

6 more elements

a convex portion engaging the center circular through-hole of the recording disk;
a disk engaging surface defined by an outer side surface of the convex portion, a portion of which engaging an inner surface of the circular center opening of the recording disk;
a disk placing portion, arranged around the convex portion, on which the recording disk is placed;
a disk placing surface, a portion of the disk placing portion, abutting against a bottom surface of the recording disk;
a relief portion defined by a substantially circular concave downwardly indented portion from the disk placing surface, arranged between the disk placing surface and the disk engaging surface along the convex portion;
and
a bottom edge of the relief portion provided between the relief portion and the disk placing surface, opposing the bottom surface of the recording disk;
wherein
the bottom edge of the relief portion is arranged inward from an inner edge of the bottom surface along the center circular through-hole of the recording disk.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/456,918Filed 12 Jul 2006
Priority: JP 2006-0292637 Feb 2006
Published: US 2007/0183090 A19 Aug 2007
Granted: 6 Jan 2009
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

G11B 17/0281
Of discs rotating during transducing operation: by an adapter enabling the centre-pin to receive carriers with large centre hole
G11B 17/0287
Of discs rotating during transducing operation: by permanent connections, e.g. screws, rivets
G11B
Information storage based on relative movement between record carrier and transducer