| 摘要 |
PROBLEM TO BE SOLVED: To provide a spindle motor capable of stably performing restriction in the axial direction without reduction of an effective contact section of a bearing with respect to a shaft, and capable of enhancing a freedom degree of design for reduction of a thickness. SOLUTION: The spindle motor includes a frame provided with a tubular holder mounted to the center of the frame such that the holder is projected upwards, with a core mounted on the outer circumferential surface of the holder; a bearing fitted into the holder of the frame, the bearing being divided into upper and lower parts, with an outside groove formed on the inner surface of the bearing along an interface between the upper and lower parts of the bearing; a shaft rotatably inserted into the bearing, with an inside groove formed on the outer surface of the shaft at a location corresponding to the outside groove of the bearing; a rotor mounted to the upper end of the shaft and having a shape of an inverted open cap, with a magnet provided on the inner surface of a skirt of the rotor such that the magnet faces the core with a gap defined between them; a thrust plate closing the lower end of the frame, with the bearing fitted into the lower end of the frame; and an annular stopper placed in a space defined both by the inside groove and by the outside groove and preventing axial movement of the shaft. COPYRIGHT: (C)2008,JPO&INPIT
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