Bearing and spindle motor

Abstract

Provided is a sintered bearing with oil for a spindle motor. The bearing is characterized in that at least one portion of upper and lower sides of the bearing is denser than other portions of the bearing.

Description

technical field [0001] The invention relates to a bearing and a spindle motor including the bearing. Background technique [0002] The spindle motor is used in an optical disc drive (ODD) for rotating the disc while moving the optical pickup device in the radial direction of the disc to read data from the disc. In an optical disc drive, a disc is loaded on a turntable fixed to a shaft. Thus, the disk can be rotated by driving the turntable. The shaft is supported by bearings that fit tightly into the housings. [0003] figure 1 is a sectional view showing the bore of a bearing 10 according to the prior art, figure 2 is a plan view showing the bearing 10 and the shaft 20 coupled to the bearing 10 . [0004] refer to figure 1 , The bearing 10 is formed from sintered metal powder. After the bearing 10 is cut longitudinally, when a cross-sectional image of the bearing 10 is obtained by using a scanning electron microscope, holes 11 can be found in the bearing 10 as well ...

AI Technical Summary

Problems solved by technology

Thus, a disadvantage of the spindle motor comprising the bearing 10 is that when the shaft 20 rotates in the bearing 10, the shaft 20 vibrates in the radial direction because the inner surface of the bearing 10 is uneven due to the presence of the hole 11

Therefore, optical reading devices using spindle motors are not very reliable

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