Patent ID: 6400524
Filing Date: 2002-06-04
Classification: G11B

Abstract:
A disc drive, comprising:an excitation source which rotates about an excitation axis; and a housing which supports the excitation source, comprising: a top cover; a bottom cover which cooperates with the top cover to form an enclosure in which the excitation source is disposed, wherein at least a selected one of the top and bottom covers comprises a plate which extends substantially normal to the excitation axis, the plate having an outermost perimeter, a contact point to which the excitation source is mounted, a first portion which extends at least 180 degrees about the contact point and which has a first thickness as measured in a direction parallel to the excitation axis, and a second portion disposed between the first portion and the outermost perimeter which extends at least 180 degrees about the contact point and which has a second thickness as measured in a direction parallel to the excitation axis, wherein the first thickness is greater than the second thickness; and a damping material affixed to the second portion of the plate, wherein the damping material has a damping material thickness as measured in a direction parallel to the excitation axis, and wherein the first thickness is nominally equal to the second thickness in combination with the damping material thickness.