US6498700B2
Expired / Lapsed
US
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Damping material, damping method and disc drive
Assignee: Nitto Denko Corp
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Filing: 1999-08-24
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Granted: 2002-12-24
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Expires: 2019-08-24
Abstract
Abstract A damping material is made of a porous member having an absolute characteristic impedance value of not less than 800 kg/m 2 ·S in the frequency range of from 1.0 to 3.0 kHz. A damping method has steps of providing a damping material in the interior or on the periphery of a vibration-generating apparatus, characterized in that as the damping material there is used a compressible porous member having an air permeability of from 1×{fraction (1/10)} 10 to 2×{fraction (1/10)} 2 cc/cm 2 /sec based on an atmospheric pressure difference of 2.039×{fraction (1/10)} 4 mMH 2 O or a porous member having an absolute impedance value of not less than 800 kg/m 2 ·S in a frequency range of from 1 to 3 kHz or one obtained by providing a film layer thereon. A disc drive has a motor for rotating a disc as a data recording medium and a damping material provided in the interior and/or on the periphery of a housing having at least a space in which the disc can be mounted.
Inventors
- 👤 Nobuyuki Takahashi
- 👤 Hideyuki Kitai
- 👤 Kazumasa Tanaka
- 👤 Manabu Matsunaga
- 👤 Yasunori Sugihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:42
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/36; F16F1/3605; G; G11; G11B; G11B33/00; G11B33/02; G11B33/08
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
39 words
A damping material made of one of fibers aggregated into fabric and a foamed product having an absolute characteristic impedance value of not less than 800 kg/m 2 •S in a frequency range of from 1.0 to 3.0 kHz.
Claim 2
Dependent Claim
39 words
A damping material made of one of fibers aggregated into fabric and a foamed product having an absolute characteristic impedance value of not less than 800 kg/m 2 •S in a frequency range of from 1.0 to 3.0 kHz.
Claim 3
Dependent Claim
40 words
A damping material according to claim 1 , wherein said damping material satisfies a relationship: α≧0.01 f neper/m, supposing that a damping factor is α and a frequency is f in the frequency range of from 1.0 to 3.0 kHz.
Claim 4
Dependent Claim
26 words
A damping material according to claim 2 , wherein said damping material exhibits a repulsion stress of from 10 to 200 gf/cm 2 at 50% compression.
Claim 5
Dependent Claim
26 words
A damping material according to claim 1 , wherein said damping material exhibits a repulsion stress of from 10 to 200 gf/cm 2 at 50% compression.
Claim 6
Dependent Claim
50 words
A damping material according to claim 1 , wherein said fibers are one of natural fibers, synthetic organic fibers, and synthetic inorganic fibers, and wherein said foamed product is one of olefin polymer, urethane polymer, acrylic polymer, vinyl chloride polymer, SBR polymer, NR polymer, NBR polymer, and a blend thereof.
Claim 7
Dependent Claim
26 words
A damping material according to claim 1 , wherein said foamed product includes (a) ethylene, (b) α-olefin, and (c) one of cyclic polyenes and noncyclic polyenes.
Claim 8
Dependent Claim
28 words
A damping material according to claim 1 , wherein said foamed product is one of natural rubber, butyl rubber, chloroprene rubber, acrylic rubber, styrene-butadiene rubber, and nitrile-butadiene rubber.
Claim 9
Dependent Claim
62 words
A damping method comprising a step of: providing a damping material one of in an interior and on a periphery of a vibration-generating apparatus, wherein said damping material comprises one of fibers aggregated into fabric and a foamed product having an absolute impedance value of not less than 800 kg/m 2 •S in a frequency range of from 1 to 3 kHz.
Claim 10
Dependent Claim
62 words
A damping method comprising a step of: providing a damping material one of in an interior and on a periphery of a vibration-generating apparatus, wherein said damping material comprises one of fibers aggregated into fabric and a foamed product having an absolute impedance value of not less than 800 kg/m 2 •S in a frequency range of from 1 to 3 kHz.
Claim 11
Dependent Claim
71 words
A damping method according to claim 8 wherein said one of fibers aggregated into fabric and a foamed product constituting the damping material exhibits one of the following condition (1) a sound absorbing coefficient of not less than 20% at a frequency of 3.15 kHz and (2) a damping factor α satisfying in a frequency range of from 1 to 3 kHz the relationship α≧0.01 f neper/m wherein f is frequency.
Claim 12
Dependent Claim
49 words
A damping method according to claim 9 , wherein said vibration-generating apparatus is a disc drive for rotating disc and said one of fibers aggregated into fabric and a foamed product constituting the damping material exhibits a repulsion stress of from 10 to 200 gf/cm 2 at 50% compression.
Claim 13
Dependent Claim
49 words
A damping method according to claim 8 wherein said vibration-generating apparatus is a disc drive for rotating a disc and said one of fibers aggregated into fabric and a foamed product constituting the damping material exhibits a repulsion stress of from 10 to 200 gf/cm 2 at 50% compression.
Claim 14
Dependent Claim
80 words
A disc drive comprising: a motor for rotating a disc as a data recording medium; and a damping material provided in an interior and/or on a periphery of a housing having at least a space in which said disc can be mounted, wherein said damping material comprising one of fibers aggregated into fabric and a foamed product having an absolute impedance value of not less than 800 mkg/m 2 •S in a frequency range of from 1 to 3 kHz.
Claim 15
Dependent Claim
80 words
A disc drive comprising: a motor for rotating a disc as a data recording medium; and a damping material provided in an interior and/or on a periphery of a housing having at least a space in which said disc can be mounted, wherein said damping material comprising one of fibers aggregated into fabric and a foamed product having an absolute impedance value of not less than 800 mkg/m 2 •S in a frequency range of from 1 to 3 kHz.
Claim 16
Dependent Claim
175 words
A damping method comprising a step of: providing a damping material one of in an interior and on a periphery of a vibration-generating apparatus, wherein said damping material comprises one of a compressible fiber aggregate and a compressible foamed product having an air permeability of from 1×1/10 10 to 2×1/10 2 cc/cm 2 /sec based on an atmospheric pressure difference of 2.039 ×1/10 4 mmH 2 O, and a film layer formed on said one of a compressible fiber aggregate and a compressible foamed product, wherein said one of a compressible fiber aggregate and a compressible foamed product has one of the following condition (1) a sound absorbing coefficient of not less than 20% at a frequency of 3.15 kHz and (2) a damping factor α satisfying in a frequency range of from 1 to 3 kHz the relationship α≧0.01 f neper/m where f is frequency, and said film layer has a thickness of from 5 to 200 μm and is made of one of a polyester, polyethylene, polyamide, polyimide, polystyrene and vinyl chloride polymer.
Claim 17
Dependent Claim
175 words
A damping method comprising a step of: providing a damping material one of in an interior and on a periphery of a vibration-generating apparatus, wherein said damping material comprises one of a compressible fiber aggregate and a compressible foamed product having an air permeability of from 1×1/10 10 to 2×1/10 2 cc/cm 2 /sec based on an atmospheric pressure difference of 2.039 ×1/10 4 mmH 2 O, and a film layer formed on said one of a compressible fiber aggregate and a compressible foamed product, wherein said one of a compressible fiber aggregate and a compressible foamed product has one of the following condition (1) a sound absorbing coefficient of not less than 20% at a frequency of 3.15 kHz and (2) a damping factor α satisfying in a frequency range of from 1 to 3 kHz the relationship α≧0.01 f neper/m where f is frequency, and said film layer has a thickness of from 5 to 200 μm and is made of one of a polyester, polyethylene, polyamide, polyimide, polystyrene and vinyl chloride polymer.
Claim 18
Dependent Claim
44 words
A damping method according to claim 13 , wherein said vibration-generating apparatus is a disc drive for rotating a disc and said damping material is made of a porous member having a repulsion stress of from 10 to 200 gf/cm 2 at 50% compression.
Claim 19
Dependent Claim
78 words
A damping method comprising a step of: providing a damping material one of in an interior and on a periphery of a vibration-generating apparatus, wherein said damping material comprises one of fibers aggregated into fabric and a foamed product having an absolute impedance value of not less than 800 kg/m 2 •S in a frequency range of from 1 to 3 kHz, and a film layer on said one of fibers aggregated into fabric and a foamed product.
Claim 20
Dependent Claim
78 words
A damping method comprising a step of: providing a damping material one of in an interior and on a periphery of a vibration-generating apparatus, wherein said damping material comprises one of fibers aggregated into fabric and a foamed product having an absolute impedance value of not less than 800 kg/m 2 •S in a frequency range of from 1 to 3 kHz, and a film layer on said one of fibers aggregated into fabric and a foamed product.
Claim 21
Dependent Claim
97 words
A damping method according to claim 15 , wherein said one of fibers aggregated into fabric and a foamed product has one of the following conditions (1) a sound absorbing coefficient of not less than 20% at a frequency of 3.15 kHz and (2) a damping factor α satisfying in a frequency range of from 1 to 3 kHz the relationship α≧0.01 f neper/m where f is frequency, and said film layer has a thickness of from 5 to 200 μm and is made of one of a polyester, polyethylene, polyamide, polyimide, polystyrene and vinyl chloride polymer.
Claim 22
Dependent Claim
45 words
A damping method according to claim 16 wherein said vibration-generating apparatus is a disc drive for rotating a disc and said one of fibers aggregated into fabric and a foamed product has a repulsion stress of from 10 to 200 gf/cm 2 at 50% compression.
Claim 23
Dependent Claim
45 words
A damping method according to claim 15 wherein said vibration-generating apparatus is a disc drive for rotating a disc and said one of fibers aggregated into fabric and a foamed product has a repulsion stress of from 10 to 200 gf/cm 2 to 50% compression.
Claim 24
Dependent Claim
102 words
A disc drive comprising: motor for rotating a disc as a data recording medium; and a damping material provided in an interior and/or on a periphery of a housing having at least a space in which said disc can be mounted, wherein said damping material comprises on of a compressible fiber aggregate and a compressible foamed product having an air permeability of from 1 ×1/10 10 to 2 ×1/10 2 cc/cm 2 /sec based on an atmospheric pressure difference of 2.039 ×1/10 4 mmH2O and a film layer formed on said one of a compressible fiber aggreagate and a compressible foamed product.
Claim 25
Dependent Claim
102 words
A disc drive comprising: motor for rotating a disc as a data recording medium; and a damping material provided in an interior and/or on a periphery of a housing having at least a space in which said disc can be mounted, wherein said damping material comprises on of a compressible fiber aggregate and a compressible foamed product having an air permeability of from 1 ×1/10 10 to 2 ×1/10 2 cc/cm 2 /sec based on an atmospheric pressure difference of 2.039 ×1/10 4 mmH2O and a film layer formed on said one of a compressible fiber aggreagate and a compressible foamed product.
Claim 26
Dependent Claim
97 words
A disc drive comprising: a motor for rotating a disc as a data recording medium; and a damping material provided in an interior and/or on a periphery of a housing having at least a space in which said disc can be mounted, wherein said damping material comprises one of fibers aggregated into fabric and a foamed product having an absolute impedance value of not less than 800 kg/m 2 •S in a frequency range of from 1 to 3 kHz, and a film layer formed on said one of fibers aggregated into fabric and a foamed product.
Claim 27
Dependent Claim
97 words
A disc drive comprising: a motor for rotating a disc as a data recording medium; and a damping material provided in an interior and/or on a periphery of a housing having at least a space in which said disc can be mounted, wherein said damping material comprises one of fibers aggregated into fabric and a foamed product having an absolute impedance value of not less than 800 kg/m 2 •S in a frequency range of from 1 to 3 kHz, and a film layer formed on said one of fibers aggregated into fabric and a foamed product.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-12-23 | 2006-06-24 | 2006-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-12-23 | 2010-06-24 | 2010-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-12-23 | 2014-06-24 | 2014-12-24 | $7700.00 | Window Closed / Lapsed |