US6285525B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Damped spacer articles and disk drive assemblies containing damped spacer articles
Assignee: 3M Innovative Properties Co
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Filing: 1998-07-01
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Granted: 2001-09-04
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Expires: 2018-07-01
Abstract
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.
Inventors
- 👤 Jeffrey W. McCutcheon
- 👤 Thomas L. Morse
- 👤 Michael A. Jung
- 👤 Brian L. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:40
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B27/00; B32B27/06; B32B15/20; B32B27/30; B32B27/308; F; F16; F16F; F16F15/00; F16F15/02; F16F15/04; F16F15/08; F16F9/00; F16F9/30; F16F9/306; G; G11; G11B; G11B17/00; G11B17/02; G11B17/038; G11B19/00; G11B19/20; G11B19/2009; G11B19/2018; G11B33/00; G11B33/02; G11B33/08; B32B2307/00; B32B2307/50; B32B2307/56
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
179 words
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.
Claim 2
Dependent Claim
179 words
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.
Claim 3
Dependent Claim
161 words
The spacer article of claim 1 , wherein said substrate further comprises (iii) at least one second protrusion joined to the lower surface of the base, each second protrusion having a height; and wherein the spacer article further comprises (c) a second constrained layer damper attached to the lower surface of the base, wherein the second constrained layer damper has a height such that it ranges from about 90 to about 300 percent of the height of the second protrusion having a greatest height on the lower surface of the base, wherein the second 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; and wherein each constrained layer damper is attached to the base via its vibration damping material layer.
Claim 4
Dependent Claim
84 words
The spacer article of claim 2 , wherein said first constrained layer damper has a height such that it ranges from about 95 to about 200 percent of the height of the first protrusion having a greatest height on the upper surface of the base and wherein said second constrained layer damper has a height such that it ranges from about 95 to about 200 percent of the height of the second protrusion having a greatest height on the lower surface of the base.
Claim 5
Dependent Claim
45 words
The spacer article of claim 3 , wherein said second constrained layer damper has a height such that it ranges from about 102 to about 120 percent of the height of the second protrusion having a greatest height on the lower surface of the base.
Claim 6
Dependent Claim
57 words
The spacer article of claim 1 wherein the spacer article has a force retention of at least about 92 percent of an initial compression force of 1.4×10 6 Pascals applied to the spacer article for about 0.2 to about 2 seconds at about 25° C. at about 15 minutes after the application of the initial compression force.
Claim 7
Dependent Claim
76 words
The spacer article of claim 2 , wherein the first constrained layer damper has a height about 0.01 to about 0.5 mm greater than the height of the first protrusion having the greatest height on the upper surface of the base, and wherein the second constrained layer damper has a height about 0.01 to about 0.5 mm greater than the height of the second protrusion having the greatest height on the lower surface of the base.
Claim 8
Dependent Claim
57 words
The spacer article of claim 2 wherein the spacer article has a force retention of at least about 92 percent of an initial compression force of 1.4×10 6 Pascals applied to the spacer article for about 0.2 to about 2 seconds at about 25° C. at about 15 minutes after the application of the initial compression force.
Claim 9
Dependent Claim
76 words
The spacer article of claim 2 , wherein the first constrained layer damper has a height about 0.02 to about 0.1 mm greater than the height of the first protrusion having the greatest height on the upper surface of the base, and wherein the second constrained layer damper has a height about 0.02 to about 0.1 mm greater than the height of the second protrusion having the greatest height on the lower surface of the base.
Claim 10
Dependent Claim
96 words
A disk drive assembly comprising: (a) a disk drive, the disk drive having a spindle; (b) a rotatable storage article positioned such that the spindle extends through a through hole in the rotatable storage article; (c) the damped spacer article of claim 2 , wherein the damped spacer article is positioned such that the spindle extends through the through hole in the spacer article, wherein the spacer article is positioned adjacent to and in contact with the rotatable storage article; and (d) a means for securing the rotatable storage article and spacer article onto the spindle.
Claim 11
Dependent Claim
45 words
The spacer article of claim 1 , wherein said first constrained layer damper has a height such that it ranges from about 95 to about 200 percent of the height of the first protrusion having a greatest height on the upper surface of the base.
Claim 12
Dependent Claim
45 words
The spacer article of claim 10 , wherein said first constrained layer damper has a height such that it ranges from about 102 to about 120 percent of the height of the first protrusion having a greatest height on the lower surface of the base.
Claim 13
Dependent Claim
13 words
The spacer article of claim 1 wherein the constrained layer damper is segmented.
References Cited (Backward Citations)
US2819032A
Cited
US3078969A
Cited
US3071217A
Cited
US3159249A
Cited
US3160549A
Cited
US4324400A
Cited
US4495432A
Cited
US4539673A
Cited
US4870429A
Cited
US5131619A
Cited
US4945432A
Cited
EP0341785A1
Cited
EP0507515A2
Cited
US5308887A
Cited
US5183863A
Cited
WO1993001599A1
Cited
US5262232A
Cited
US5367418A
Cited
US5422768A
Cited
US5538774A
Cited
US5590004A
Cited
WO1996021560A2
Cited
US5691037A
Cited
US5663851A
Cited
US5725931A
Cited
US5781374A
Cited
US6040957A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-09-03 | 2005-03-05 | 2005-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-09-03 | 2009-03-05 | 2009-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-09-03 | 2013-03-05 | 2013-09-04 | $7700.00 | Window Closed / Lapsed |