Disc centering sleeve for a disc drive

DETAILED DESCRIPTION Accordingly, it is an objective of the present invention to provide a novel disc centering device that positions maintains the information storage devices and the spacers concentric with the axis of rotation of the spindle hub.
It is a further object of this invention to provide a compliant member between the information storage discs and reduce the amount of time required to assemble a disc pack.
To achieve the foregoing and other objects in accordance with the purpose of the present invention, a disc pack assembly is provided for use within a disc drive having a spindle motor assembly rotatable about a central axis, with a spindle hub and a hub flange.
A novel disc centering sleeve of the current invention is placed around the spindle hub.
An information storage disc is stacked on the spindle hub and rests on the hub flange.
A disc spacer is placed on top of the information storage disc.
The novel disc centering sleeve has selective inner raised portions that abut against the outer surface of the spindle hub.
The novel disc centering sleeve further having selective outer raised portions that abut against the inner surface of the information storage disc and the disc spacers.
The selective inner raised portions and selective outer raised portions are alternatively positioned along the circumference of the disc centering sleeve.
Further, the selective inner raised portions and selective outer raised portions are positioned equidistant from each other along the circumference of the disc centering sleeve.
The selective outer raised portions exert a radial force to maintain the information storage discs and the spacers concentric about the central axis.
A disc clamp is used to secure the information storage discs to the spindle motor.