Patent ID: 6417988
Filing Date: 2002-07-09
Classification: G11B

Abstract:
A disc drive spindle motor assembly comprising:a spindle having an annular hub portion extending radially outward from the spindle, the hub portion defining a top surface for supporting an information storage disc mounted on the hub portion, the information storage disc having a top surface; a disc clamp having an inner centering portion defining a central aperture, a middle annular raised portion having an upper contact surface, and an outer annular peripheral portion having a lower contact surface, wherein the inner centering portion centers the disc clamp about the spindle when the disc clamp is installed over the spindle and the lower contact surface of the outer peripheral portion of the clamp engages the top surface of the information storage disc, and the middle annular raised portion extends above the top surface of the hub portion; and a disc clamp retainer fastened to the spindle over the disc clamp engaging and compressing the middle annular raised portion of the disc clamp reducing a vertical distance between the upper and lower contact surfaces to apply a clamping force through the peripheral portion of the clamp against the disc.