Hydrodynamic bearing device, spindle motor, and recording...

Details Hydrodynamic bearing device, spindle motor, and recording... Hydrodynamic bearing device, spindle motor, and recording...

2008-11-24

2011-11-22

Hoang, Huan (Department: 2827)

Dynamic magnetic information storage or retrieval

Fluid bearing record support

Disk record

C360S055000, C360S135000, C384S112000, C384S114000

Reexamination Certificate

active

08064166

ABSTRACT:
An annular groove is provided to the rotary portion and/or the fixed portion in a bearing seal portion, and its cross section has a shape approximated by an arc. The annular groove is such that the relationship between the groove width W in a direction following the surface constituting a bearing seal portion and the groove depth Dg in a direction perpendicular to the surface constituting the bearing seal portion is Dg/W<0.4.

REFERENCES:
patent: 6315452 (2001-11-01), Titcomb
patent: 6965492 (2005-11-01), Obata et al.
patent: 2002/0181151 (2002-12-01), Obata et al.
patent: 10-503830 (1998-04-01), None
patent: 2001-90733 (2001-04-01), None
patent: 2002-250341 (2002-09-01), None
patent: 2007-182946 (2007-07-01), None
patent: 96/15381 (1996-05-01), None

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