Bearings – Rotary bearing – Fluid bearing
Reexamination Certificate
2007-01-09
2007-01-09
Hannon, Thomas R. (Department: 3682)
Bearings
Rotary bearing
Fluid bearing
C384S121000
Reexamination Certificate
active
11081078
ABSTRACT:
A hydrodynamic bearing having an improved air discharging path for discharging air from the bearing when a shaft is inserted into the bearing, and an apparatus for driving a polygonal mirror using the hydrodynamic bearing. The hydrodynamic bearing includes: a bearing housing having a hollow portion filled with oil, and first and second stepped mounting recesses formed at one end of the hollow portion; a thrust plate installed in the first mounting recess so that one surface of the thrust plate is in contact with one end of the shaft, for supporting the shaft in a thrust direction, a diameter of the thrust plate being smaller than that of the first mounting recess: a first air discharging path formed at the thrust plate and/or the first mounting recess, for discharging air out of an inside of the bearing housing; a cap installed in the second mounting recess, for supporting a lower portion of the thrust plate; and a second air discharging path formed at the cap for communicating with the first air discharging path through a space between the thrust plate and the first mounting recess to discharge outwardly the air transferred from the first air discharging path.
REFERENCES:
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Korean Office Action issued Dec. 3, 2005, in Korean Patent Application No. 10-2004-0018003 which corresponds to U.S. Appl. No. 11/081,078.
Kim Hyun-surk
You Je-hwan
Hannon Thomas R.
Staas & Halsey , LLP
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