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US 6,285,525 B1Granted
Damped spacer articles and disk drive assemblies containing damped spacer articles
Assignee3M Innovative Properties Company
InventorsJeffrey W. McCutcheon, Thomas L. Morse, Michael A. Jung, Brian L. Johnson
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Abstract
The present invention relates to a vibration damped spacer articles having good force (torque and/or pressure and/or stress) retention, and disk drives having a damped spacer article and a rotatable storage article inserted therein.
Claims12
A spacer article comprising
- (a) a substrate, the substrate comprising
- (i) a base having two major opposing surfaces, an upper surface and a lower surface, and
- (ii) at least one first protrusion joined to the upper surface of the base, each first protrusion having a height;
- and
- (b) a first constrained layer damper attached to the upper surface of the base,
- wherein the first constrained layer damper has a height such that it ranges from about 90 to about 300 percent of the height of the first protrusion having a greatest height on the upper surface of the base;
- wherein the first constrained layer damper independently comprises:
- (i) a constraining layer;
- (ii) a layer of vibration damping material bonded to the constraining layer, wherein the vibration damping material comprises viscoelastic material;
- wherein the storage modulus of the constraining layer is greater than that of the viscoelastic material in the vibration damping material;
- wherein the first constrained layer damper is attached to the base via its vibration damping material layer;
- and
- wherein the spacer article has a through hole therein.
10 more elements
Dependencies are inferred from the claim text.