Rotor hub, spindle motor, and recording disk driving apparatus

Details Rotor hub, spindle motor, and recording disk driving apparatus Rotor hub, spindle motor, and recording disk driving apparatus

2005-10-20

2009-06-23

Leung, Quyen (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S261100, C310S254100, C360S098070, C360S099080

Reexamination Certificate

active

07550883

ABSTRACT:
A spindle motor according to an embodiment of the invention includes a rotor hub formed of a ferromagnetic material and a rotor magnet held by the rotor hub. The rotor hub has a flange having a shield surface that faces an upper end surface of the rotor magnet via a clearance in the axial direction and formed of a ferromagnetic material. On the outside in the radial direction of an outer peripheral surface of the rotor magnet in the flange, a rim projected downward from the shield surface of the flange is formed.

REFERENCES:
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patent: 6411463 (2002-06-01), Janik et al.
patent: 6759784 (2004-07-01), Gustafson et al.
patent: 2004/0061404 (2004-04-01), Fujii et al.
patent: H05-094669 (1993-04-01), None
patent: 2003-204642 (2003-07-01), None
patent: 2004-247013 (2004-09-01), None
patent: WO98/44500 (1998-10-01), None
patent: WO2005/122171 (2005-12-01), None

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