Patent ID: 7847451

Claim:
A spindle motor comprising: a rotor comprising a rotation shaft which includes a reduced-diameter portion formed on an end of the rotation shaft being located at a center of said rotor, a turntable connected on a top end of the rotation shaft, and a magnet installed at a rotor yoke connected to an upper portion of the rotation shaft, said rotor rotating an optical disc mounted on the turntable by the rotation of the rotation shaft; a stator supporting said rotor to be rotatable by the rotation shaft of said rotor, said stator comprising: a radial bearing, a bearing housing having a cylindrical shape comprising an upper portion sequentially surrounding an outer circumferential surface of the rotation shaft and holding a stator core facing the magnet on a base plate, and a lower portion, the base plate being installed on an outer circumferential surface of the bearing housing, and a thrust supporter supporting a bottom end of the rotation shaft; a cap connected to the lower portion by being inserted in the upper portion of the bearing housing and pressed into the lower portion of the bearing housing, sealing the lower portion of the bearing housing, the thrust supporter being disposed at a bottom of the cap; and a stop washer disposed between the thrust supporter and the bearing and engaging the reduced-diameter, portion of the rotation shaft of said rotor, of which top surface is closely contacted to a bottom surface of the bearing and of which bottom surface is closely contacted to a top surface of said cap so that the rotation shaft of said rotor inserted in said stator does not escape from said stator.