Hydrodynamic bearing device and spindle motor using the same

Details Hydrodynamic bearing device and spindle motor using the same Hydrodynamic bearing device and spindle motor using the same

2011-05-24

2011-05-24

Caldarola, Glenn A (Department: 1771)

Solid anti-friction devices, materials therefor, lubricant or se

Lubricants or separants for moving solid surfaces and...

Organic -co- compound

C508S110000, C384S100000, C384S107000

Reexamination Certificate

active

07947635

ABSTRACT:
A hydrodynamic bearing device being low in torque, low in power consumption, high in reliability and best suited for miniaturization and a spindle motor using the same.The hydrodynamic bearing device in accordance with the present invention, dynamic pressure generation grooves being provided on at least one of a shaft or a sleeve, and a lubricant being present in a clearance where the above-mentioned shaft and the above-mentioned sleeve are opposed to each other, is characterized in that the above-mentioned lubricant contains diesters obtained from a divalent alcohol having 4 to 8 carbon atoms and having no alkyl side chain at the β position and one or more kinds of saturated monovalent fatty acids having 9 to 13 carbon atoms.

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Office Action Issued Mar. 28, 2008 in U.S. Appl. No. 11/092,186.
Office Action Issued Sep. 30, 2008 in U.S. Appl. No. 11/092,186.
Office Action Issued Feb. 2, 2009 in U.S. Appl. No. 11/092,186.
Office Action Issued Nov. 27, 2009 in U.S. Appl. No. 11/092,186.

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