Hydrodynamic bearing, motor including the same, and...

Details Hydrodynamic bearing, motor including the same, and... Hydrodynamic bearing, motor including the same, and...

2007-06-14

2010-11-23

Charles, Marcus (Department: 3656)

Bearings

Rotary bearing

Fluid bearing

C384S100000, C384S115000, C384S123000

Reexamination Certificate

active

07837390

ABSTRACT:
A hydrodynamic bearing, a motor including the same, and a recording and reproducing apparatus which can improve vibration resistance property and suppress noises even in a situation where vibration is expected are provided. Radial hydrodynamic grooves formed on an inner peripheral surface of a sleeve have a shape which satisfy the relational expression L2<L1/2. L1refers to a length of a hydrodynamic causing portion of a radial bearing portion in an axial direction; and L2refers to a length in the axial direction from a benchmark point where an end portion of the radial bearing portion on an outward side in the axial direction and center of a predetermined radial hydrodynamic groove cross each other, to a relative rotational direction backward side end portion of a radial hydrodynamic groove adjacent to the predetermined radial hydrodynamic groove on the forward side in a relative rotational direction.

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