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Disk drive employing a multi-layer noise-dampening HDA cover
| Details |
Inventors: Butler, Walter W.; Kung, May C.;
Assignee: Western Digital Technologies, Inc. (Lake Forest, CA)
Primary Examiner: Tupper; Robert S.
Assistant Examiner:
Attorney, Agent or Firm: Shara, Esq.; Milad G., Sheerin, Esq.; Howard H.
A disk drive with reduced acoustic noise is disclosed. The disk drive comprises a disk, a head, an actuator arm for actuating the head radially over the disk, a base, and a cover attached to the base to form a head disk assembly chamber. The cover comprises an inner layer having a depression, the depression comprising a convex surface and a concave surface, an outer layer attached opposite the concave surface to the inner layer, the inner layer and the outer layer thereby defining walls of a cavity. The cover further comprises a damping medium disposed within the cavity, whereby the inner layer, the outer layer, and the damping medium form a multi-layer noise-damping sandwich which reduces noise emitted by the disk drive. |
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DETAILED DESCRIPTION The present invention may be regarded as a disk drive with reduced acoustic noise comprising a disk, a head, an actuator arm for actuating the head radially over the disk, a base, and a cover attached to the base to form a head disk assembly chamber.
The cover comprises an inner layer having a depression, the depression comprising a convex surface and a concave surface, an outer layer attached opposite the concave surface to the inner layer, the inner layer and the outer layer thereby defining walls of a cavity.
The cover further comprises a damping medium disposed within the cavity, whereby the inner layer, the outer layer, and the damping medium form a multi-layer noise-damping sandwich which reduces noise emitted by the disk drive.
In one embodiment the damping medium comprises a metal weight.
In an alternative embodiment, the damping medium further comprises an adhesive layer for securing the metal weight to at least one of the walls of the cavity.
In yet another embodiment, the damping medium comprises compressed acoustic foam.
In still another embodiment, the convex surface of the depression is positioned proximate the disk within the head disk assembly chamber for reducing air turbulence and windage drag.
The present invention may also be regarded as a method for manufacturing a disk drive with reduced acoustic noise.
A depression is formed in an inner layer of a cover, the depression comprising a convex surface and a concave surface.
An outer layer is attached opposite the concave surface to the inner layer, the inner layer and the outer layer thereby defining walls of a cavity.
A damping medium is disposed within the cavity, whereby the inner layer, the outer layer, and the damping medium form a multi-layer noise-damping sandwich which reduces noise emitted by the disk drive.
The inner layer of the cover is attached to a base to form a head disk assembly chamber.
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Generators or Motors 
