Hard disk drive device, and fluid dynamic bearing spindle...

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

Reexamination Certificate

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C384S107000, C310S090000

Reexamination Certificate

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11167126

ABSTRACT:
A hydrodynamic bearing for a hard disk drive device is disclosed. An oil is filled in a clearance between an inner surface of the hub and an outer surface of the shaft, whereby a hydrodynamic radial bearing is formed between the inner periphery of the hub and the outer periphery of the shaft, and a hydrodynamic thrust bearing is formed between the top face of the shaft and the thrust plate. Between an outer peripheral part at the base end of the shaft and an inner peripheral part at the open end of the hub is formed a seal part in which a larger clearance is formed between the shaft and the hub than a clearance in the hydrodynamic radial bearing and in which the oil surface is positioned. An oil surface adjusting hole and a plug for sealing the hole are provided in the case opposite the seal part.

REFERENCES:
patent: 5623382 (1997-04-01), Moritan et al.
patent: 6246136 (2001-06-01), Ichiyama
patent: 6493181 (2002-12-01), Ichiyama
patent: 7284910 (2007-10-01), Dittmer et al.
patent: 2003/0174915 (2003-09-01), Parsoneault et al.
patent: 2003/0185473 (2003-10-01), Gomyo et al.
patent: 2005/0218735 (2005-10-01), Herndon et al.
patent: 61252915 (1986-11-01), None
patent: 02021022 (1990-01-01), None
patent: 10108407 (1998-04-01), None
patent: 2000186717 (2000-07-01), None
patent: 2003-35311 (2003-02-01), None
patent: 2003-097546 (2003-04-01), None
English language Abstract of JP 2003-097546.
English language Abstract of JP 2003-035311.

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