Patent ID: 6028738
Filing Date: 2000-02-22
Classification: G11B

Abstract:
A magnetic disk drive motor comprising:a printed board mounted on an upper surface of a frame of a magnetic disk drive and having a coil formed on a surface thereof;a spindle shaft inserted into a through hole formed in the frame and the printed board and being supported so as to be vertical and rotatable with respect to the frame;a rotor including a rotor case and a ringlike rotor magnet, the rotor case mounted on the spindle shaft so as to confront the coil on the printed board, the rotor magnet mounted inside the rotor case;a disklike disk table having a shaft hole larger than a diameter of the spindle shaft and being integral with the rotor case, the disklike disk table supporting a magnetic disk,a bearing portion formed integrally within the shaft hole of the disklike disk table and about the shaft, the bearing portion further having an extended collar being formed on an upper surface of the disklike disk table so as to increase a holding strength of the bearing portion; andthe bearing portion is formed integrally with the rotor case, the disk table, and the spindle shaft by molding a resin, the resin having a magnetic powder mixed therein.