Spindle motor and mobile communication system using the same

A spindle motor for disk drives comprising:

• a circuit board;
• a cylindrical housing fixedly mounted on the circuit board;
• a shaft rotatably inserted into the housing;
• a plurality of grooves formed in an inner periphery of the housing;
• a molybdenum disulfide film formed through penetration in the inner periphery of the housing including the grooves, the molybdenum disulfide film and the grooves serving as lubricant to the shaft during rotation of the shaft;
• an armature arranged on the circuit board adjacent to an outer periphery of the housing and having lamellar conductors laminated one atop another;
• and
• a rotor integrally fixed to the shaft and having a turntable arranged in a top portion thereof for seating a disk and a magnet arranged in an underside portion thereof for cooperating with the armature to generate electromagnetic force to turn the rotor.

A personal mobile communication system comprising:

• a main body having a data input unit, a main body circuit board and a liquid crystal display;
• and
• a disk drive having a spindle motor mounted inside the main body for rotating a data storage disk, wherein the spindle motor includes:
• a spindle motor circuit board selectively connected with the main body circuit board;
• a cylindrical housing fixedly mounted on the spindle motor circuit board and allowing a shaft to be rotatably inserted into the housing;
• a plurality of grooves formed in an inner periphery of the housing;
• a molybdenum disulfide film formed through penetration in the inner periphery of the housing including the grooves, the molybdenum disulfide film and the grooves serving as lubricant to the shaft during rotation of the shaft;
• an armature arranged on the spindle motor circuit board adjacent to an outer periphery of the housing and having lamellar conductors laminated one atop another;
• and
• a rotor integrally fixed to the shaft and having a turntable arranged in a top portion thereof for seating a disk and a magnet arranged in an underside portion thereof for cooperating with the armature to generate electromagnetic force to turn the rotor.

A personal mobile communication system comprising:

• a main body having a data input unit, a main body circuit board and a liquid crystal display;
• and
• a disk drive having a spindle motor mounted inside the main body for rotating a data storage disk, wherein the spindle motor includes:
• a spindle motor circuit board selectively connected with the main body circuit board;
• a cylindrical housing fixedly mounted on the spindle body circuit board;
• a shaft rotatably inserted into the housing;
• a plurality of grooves formed in an inner periphery of the housing;
• a molybdenum disulfide film formed through penetration in the inner periphery of the housing including the grooves, the molybdenum disulfide film and the grooves serving as lubricant to the shaft during rotation of the shaft;
• an armature arranged on the circuit board adjacent to an outer periphery of the housing and having lamellar conductors laminated one atop another;
• and
• a rotor integrally fixed to the shaft and having a turntable arranged in a top portion thereof for seating a disk and a magnet arranged in an underside portion thereof for cooperating with the armature to generate electromagnetic force to turn the rotor.