Patent ID: 7085108
Filing Date: 2006-08-01
Classification: G11B

Abstract:
1. A head stack assembly, comprising: a body portion, the body portion including a bore surface that defines a through bore; an actuator arm cantilevered from the body portion; a read/write head coupled to the actuator arm; a coil cantilevered from the body portion in an opposite direction from the actuator arm; a pivot-bearing cartridge configured to fit within the through bore for pivotally supporting the head stack assembly on a base, the pivot-bearing cartridge including an inner portion and an outer portion, the inner and outer portions being separated by upper and lower bearings, the outer portion including an outer surface that faces the bore surface, and a tolerance ring disposed between the outer surface of the pivot-bearing cartridge and the bore surface, the tolerance ring including: a single sleeve defining an inner sleeve surface facing the pivot-bearing cartridge and an outer sleeve surface facing away from the pivot-bearing cartridge, and a layer of dampening material disposed on one of the inner and outer sleeve surfaces so as to encircle the pivot-bearing cartridge over most of its periphery and so as to be in contact with one of the outer surface of the pivot-bearing cartridge and the bore surface, respectively.