Patent ID: 6115213
Filing Date: 2000-09-05
Classification: F16C,G11B

Abstract:
A magnetic disk drive including a spindle motor having a stator and a rotor for rotating a magnetic disk having magnetic information stored thereon; a transducer for writing and/or reading information on said magnetic disk; and an actuator for moving said transducer on a surface of said magnetic disk, characterized in that at least one of bearing assemblies for rotating said spindle motor and for oscillating said actuator comprises a large-diameter bearing of discrete construction including an inner ring and an outer ring, a small-diameter bearing of discrete construction including an inner ring and an outer ring, an inner ring coupling member for connecting said inner rings of the large- and small-diameter bearings, and an outer ring coupling member for connecting said outer rings of the large- and small-diameter bearings;wherein one of said large-diameter bearing and said small-diameter bearing has a larger rotational axis thickness than the other, and at least a portion of a rotational axis thickness of the other of said large-diameter bearing and said small-diameter bearing is disposed within said larger rotational axis thickness; andwherein both said large-diameter bearing and said small-diameter bearing are disposed at radial positions which are inside of a radial position of said stator and a rotor of said spindle motor.