Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Reexamination Certificate
2005-07-19
2005-07-19
Renner, Craig A. (Department: 2652)
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
C310S090000
Reexamination Certificate
active
06920013
ABSTRACT:
In a spindle motor utilizing dynamic-pressure bearings having a full-fill structure, a bearing configuration that balances and sustains at or above atmospheric pressure the internal pressure of the bearing oil. Thrust and radial bearing sections are configured within oil-filled bearing clearances in between the rotor, the shaft, and a shaft-encompassing hollow bearing member. A communicating passage one end of which opens on, radially inwardly along, the thrust bearing section is formed in the bearing member. Either axial ends of the bearing clearance in between the bearing member and shaft communicate through the passage. The communicating passage enables the oil to redistribute itself within the bearing clearances. Pressure difference between the axial upper and lower ends of the oil retained in between the bearing member and the shaft is compensated through the communicating passage, preventing incidents of negative pressure within the oil and of over-lift on the rotor.
REFERENCES:
patent: 4998033 (1991-03-01), Hisabe et al.
patent: 5273368 (1993-12-01), Asada et al.
patent: 5659445 (1997-08-01), Yoshida et al.
patent: 6456458 (2002-09-01), Ichiyama
patent: 2003/0230943 (2003-12-01), Tokunaga et al.
Mori Yasuhiro
Nishimura Hideki
Oku Yoshioto
Nidec Corporation
Renner Craig A.
Shinjyu Global IP
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