Patent ID: 6236544
Filing Date: 2001-05-22
Classification: G11B

Abstract:
An actuator arm assembly for a magnetic disk apparatus comprising a body reciprocally rotatable when driven by a motor and an arm mounted on the body and supporting a magnetic head mounted thereon for recording and reproduction, the arm being reciprocally rotated with the reciprocal rotation of and in the same directions as the body for causing reciprocal rotation of the magnetic head across a disc in the magnetic disc apparatus, wherein:the body is formed separately from the arm and angularly cylindrical in shape, having projections on a part of is outer periphery, and its outer periphery has a fitting recess, in which a ring-shaped fitting portion of the arm can be fitted, and projections or flanges defined over, under and between adjacent ones of the fitting recesses, the fitting portion of the arm being capable of being moved along the axial direction of the body and being fitted on the body around the flanges in a predetermined orientation relative to the body, and by turning the arm with the fitting portion thereof fitted on the body the fitting portion is fitted in the fitting recess, while an engagement portion on the outer side of the fitting portion is engaged with the flanges and prevents the detachment of the arm in the axial direction of the body.