Spindle motor and disk-shaped medium recording and producing...

Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record

Reexamination Certificate

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C384S107000, C384S112000

Reexamination Certificate

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08085495

ABSTRACT:
A spindle motor can suppress the generation of noise during swinging and the extend service life, and also suppress the increase in current consumption. The outside diameter of a thrust hydrodynamic groove is at least 10% of the outside diameter of a disk-shaped medium, and the depth of the radial hydrodynamic groove is greater than the depth of the thrust hydrodynamic groove. By adjusting to specific numbers, the angular stiffness in the thrust bearing is raised, and even if a disturbance torque should be applied, wear or noise caused by metal contact inside the bearing can be suppressed.

REFERENCES:
patent: 6431757 (2002-08-01), Nakazeki et al.
patent: 6575633 (2003-06-01), Goto et al.
patent: 7021829 (2006-04-01), Tamaoka
patent: 7293917 (2007-11-01), Jang et al.
patent: 7448805 (2008-11-01), Kita et al.
patent: 2007/0292060 (2007-12-01), Kusaka et al.
patent: 2001-124065 (2001-05-01), None
patent: 2002-171719 (2002-06-01), None
patent: 2004183768 (2004-07-01), None
patent: 2005-45924 (2005-02-01), None
patent: WO 2006049114 (2006-05-01), None

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