Title:
FLUID DYNAMIC PRESSURE BEARING DEVICE AND SPINDLE MOTOR AND DISK DRIVE DEVICE USING IT
Document Type and Number:
WIPO Patent Application WO/2008/069226
Kind Code:
A1
Abstract:
A fluid dynamic pressure bearing device using ionic liquid as lubricant, in which
a shaft member and a sleeve member are not corroded by ionic fluid, and static electricity
generated is not accumulated. Aluminum with an oxide film formed on the surface
thereof is used for the shaft member (11) and the sleeve member (12), and aluminum
exposed portions (B1, B2) are formed on the surfaces in contact with ionic liquid,
other than dynamic pressure generating grooves, of the shaft member (11) and
the sleeve member (12), whereby the shaft member (11) and the sleeve member (12)
are kept substantially at the same potential via ionic liquid.
Inventors:
GOMYO MASATO (JP)
SASAKI HIRONAO (JP)
SASAKI HIRONAO (JP)
Application Number:
PCT/JP2007/073453
Publication Date:
June 12, 2008
Filing Date:
December 05, 2007
Export Citation:
Assignee:
NIDEC CORP (JP)
GOMYO MASATO (JP)
SASAKI HIRONAO (JP)
GOMYO MASATO (JP)
SASAKI HIRONAO (JP)
International Classes:
F16C33/10; C10M105/54; C10M105/58; C10M105/68; C10M105/70; C10M105/72; C10M105/74; C10M109/02; F16C17/10; F16C33/12; G11B19/20; H02K7/08; C10N30/00; C10N40/02
Foreign References:
| JP2004187494A | 2004-07-02 | |||
| JPH11275807A | 1999-10-08 | |||
| JP2001263346A | 2001-09-26 | |||
| JP2006105207A | 2006-04-20 | |||
| JP2006105332A | 2006-04-20 | |||
| JPH11167765A | 1999-06-22 | |||
| JP2006204089A | 2006-08-03 |
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