SPINDLE MOTOR HAVING INTEGRATED TURN TABLE, CAPABLE OF PRECISELY CONTROLLING THE HEIGHT BETWEEN THE LOWER SIDE OF DISK AND THE UPPER SIDE OF MOTOR BASE PLATE WITHIN ERROR RANGE

摘要

PURPOSE: A spindle motor having an integrated turn table is provided to form a frictional portion for generating a frictional force on a lower side of a concave groove or an upper side of a protruded end when being contacted with a disk, thereby precisely controlling a height between a lower side of the disk and an upper side of a motor base plate within an error range by adjusting a thickness of the frictional portion. CONSTITUTION: A disk(D) is clamped on a chuck(110). A stator(121) is fixed to a motor base plate(130). A rotor case(122) has a driving magnet(123) mounted on an inner side corresponding to the stator(121). An upper end of a rotational shaft(124) is inserted into the rotor case(122), and a lower end thereof is rotatively assembled on a shaft holder of the stator(121). A frictional portion(20) has a ring-shaped turn table(10) on an upper side of the rotor case(122) corresponding to a lower side of the disk(D), and generates a frictional force in contact with the lower side of the disk(D) on an upper side of the turn table(10).