Abstract: Disclosed herein is a brushless DC motor that ensures stable driving of a shaft that rotates in a hollow of a bearing by using a bearing with a flat bottom surface and a tapered top. A contact height between an inner peripheral surface of the bearing and an outer peripheral surface of the shaft is larger than a contact height between an outer peripheral surface of the bearing and an inner peripheral surface of a bearing holder.

Abstract: Disclosed herein is a ring shaped rubber magnet for a spindle motor formed by coupling one surface and the other surface of a sheet shaped rubber magnet to each other, wherein one surface of the sheet shaped rubber magnet has an obtuse angle of 90 degrees or more at an edge of one end portion thereof and an acute angle of 90 degrees or less at an edge of the other end portion thereof, and the other surface of the sheet shaped rubber magnet has an acute angle of 90 degrees or less at an edge of one end portion thereof and an obtuse angle of 90 degrees or more at an edge of the other end portion thereof.

Abstract: Disclosed herein is a spindle motor including: a rotor part including a shaft and a rotor case coupled to the shaft to rotate integrally with the shaft, having a rotor magnet coupled to an inner side thereof, and having a disk mounted on one surface thereof; and a stator part including a base plate having the rotor part coupled thereto, a bearing part rotatably supporting the shaft, and an armature having a stator core part coupled to an outer peripheral surface of the bearing part so as to face the rotor magnet and a coil wound several times around the stator core part, wherein the stator core part is formed by stacking a plurality of stator cores having different thickness ratios.

Abstract: Disclosed herein is an assembly structure of a bearing and a holder of a brushless DC motor. The bearing is forcibly fitted into a hollow space formed through the holder. A beveled mouth edge is formed on the upper end of the circumferential inner surface of the holder through which the bearing enters the holder. Therefore, the assembly structure can enhance the workability of the process of assembling the bearing with the holder.

Abstract: There is provided a motor having an improved coupling structure between a circuit board and a base plate, and an optical disc drive using the same. The motor includes: a base plate; and a circuit board coupled to a surface of the base plate and having insulating layers formed on both surfaces thereof, wherein the insulating layers formed on both surfaces of the circuit board have different thicknesses. In particular, an insulating layer formed on one surface of the circuit board attached to the base plate may be thicker than an insulating layer formed on the other surface thereof.

Abstract: Disclosed herein is an assembly structure of a bearing and a holder of a brushless DC motor. The bearing is forcibly fitted into a hollow space formed through the holder. A beveled mouth edge is formed on the upper end of the circumferential inner surface of the holder through which the bearing enters the holder. Therefore, the assembly structure can enhance the workability of the process of assembling the bearing with the holder.

Abstract: Disclosed herein is an assembly structure of a bearing and a holder of a brushless DC motor. The bearing is forcibly fitted into a hollow space formed through the holder. A beveled mouth edge is formed on the upper end of the circumferential inner surface of the holder through which the bearing enters the holder. Therefore, the assembly structure can enhance the workability of the process of assembling the bearing with the holder.