US4460060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibratory diaphragm for loudspeaker
Assignee: Toray Industries Inc
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Filing: 1981-08-27
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Granted: 1984-07-17
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Expires: 2001-08-27
Abstract
Abstract This is a vibratory diaphragm for a loudspeaker of sound appliances such as stereophonic phonographs or television receivers, which is made of composite material composed of polyimide resin, graphite granules and fabric of high strength and high modulus filaments. A vibratory diaphragm having well-balanced characteristics in the specific modulus, the internal loss, the mechanical strength, the thermal stability and the fatigue resistance is obtained. The polyimide resin gives high thermal stability, while the graphite granules greatly increase the internal loss. The fabric of high strength and high modulus filaments improves the specific modulus, the mechanical strength and the fatigue resistance.
Inventors
- 👤 Shigeru Hasumi
- 👤 Kazuo Tanaka
- 👤 Takashi Nishidoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:41
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/26; Y10T428/266; Y10T428/269; Y10T428/30; Y10T442/00; Y10T442/20; Y10T442/2008; Y10T442/2861; Y10T442/2893; Y10T442/2926; Y10T442/2984; Y10T442/2992
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
25 words
A vibratory diaphragm for a loudspeaker made of composite material composed of polyimide resin, graphite granules and fabric of high strength and high modulus filaments.
Claim 2
Dependent Claim
25 words
A vibratory diaphragm for a loudspeaker made of composite material composed of polyimide resin, graphite granules and fabric of high strength and high modulus filaments.
Claim 3
Dependent Claim
17 words
A vibratory diaphragm for a loudspeaker as claimed in claim 1, wherein the thickness is 0.02-0.7 mm.
Claim 4
Dependent Claim
22 words
A vibratory diaphragm for a loudspeaker as claimed in claim 1, wherein the content of the polyimide resin is 35-65% by volume.
Claim 5
Dependent Claim
20 words
A vibratory diaphragm for a loudspeaker as claimed in claim 1, wherein the polyimide resin is a polymer of bismaleimide.
Claim 6
Dependent Claim
23 words
A vibratory diaphragm for a loudspeaker as claimed in claim 4, wherein the bismaleimide is N,N'-ethylene-bismaleimide, N,N'-hexamethylene-bismaleimide, N,N'-mataphenylene-bismaleimide, N,N'-paraphenylene-bismaleimide, N,N'-p,p'-diphenylmethane-bismaleimide, N,N'-p,p'-diphenylether-bismaleimide or N,N'-p,p'-dicyclohexylmethane-bismaleimide.
Claim 7
Dependent Claim
20 words
A vibratory diaphragm for a loudspeaker as claimed in claim 1, wherein the polyimide resin is a copolymer of bismaleimide.
Claim 8
Dependent Claim
45 words
A vibratory diaphragm for a loudspeaker as claimed in claim 6, wherein the copolymerized compound is 4,4'-diaminodiphenylmethane, condensation product of aniline and formaldhyde, 4,4'-diaminodiphenylether, 4,4'-diaminodicyclohexylmethane, 4,4'-diaminodiphenylsulfone, metaphenylenediamine, paraphenylenediamine, cyanic acid ester of bispehnol-A or their oligomer, derivative of isocyanuric acid, vinyl compound or epoxy compound.
Claim 9
Dependent Claim
57 words
A vibratory diaphragm for a loudspeaker as claimed in claim 6, wherein the bismaleimide is N,N'-ethylene-bismaleimide, N,N'-hexamethylene-bismaleimide, N,N'-metaphenylene-bismaleimide, N,N'-paraphenylene-bismaleimide, N,N'-p,p'-diphenylmethane-bismaleimide, N,N'-p,p'-diphenylether-bismaleimide or N,N'-p,p'-dicyclohexylmethane-bismaleimide, and the copolymerized compound is 4,4'-diaminodiphenylmethane, condensation product of aniline and formaldhyde, 4,4'-diaminodiphenylether, 4,4'-diaminodicyclohexylmethane, 4,4'-diaminodiphenylsulfone, metaphenylenediamine, paraphenylenediamine, cyanic acid ester of bisphenol-A or their oligomer, derivative of isocyanuric acid, vinyl compound or epoxy compound.
Claim 10
Dependent Claim
22 words
A vibratory diaphragm for a loudspeaker as claimed in claim 1, wherein the content of the graphite granules is 5-30% by volume.
Claim 11
Dependent Claim
22 words
A vibratory diaphragm for a loudspeaker as claimed in claim 1, wherein the average diameter of the graphite granules is 1-200 microns.
Claim 12
Dependent Claim
22 words
A vibratory diaphragm for a loudspeaker as claimed in claim 10, wherein the average diameter of the graphite granules is 5-50 microns.
Claim 13
Dependent Claim
22 words
A vibratory diaphragm for a loudspeaker as claimed in claim 1, wherein the content of the fabric is 20 -50% by volume.
Claim 14
Dependent Claim
17 words
A vibratory diaphragm for a loudspeaker as claimed in claim 1, wherein the fabric is woven fabric.
Claim 15
Dependent Claim
26 words
A vibratory diaphragm for a loudspeaker as claimed in claim 13, wherein the woven fabric is plane weave fabric, twill weave fabric or satin weave fabric.
Claim 16
Dependent Claim
34 words
A vibratory diaphragm for a loudspeaker as claimed in claim 13, wherein the woven fabric is made of at least one kind of filament selected from the group consisting of carbon, glass and polyaramid.
Claim 17
Dependent Claim
22 words
A vibratory diaphragm for a loudspeaker as claimed in claim 13, wherein the weave density of the woven fabric is 3-40 filaments/cm.
Claim 18
Dependent Claim
22 words
A vibratory diaphragm for a loudspeaker as claimed in claim 16, wherein the weave density of the woven fabric is 4-30 filaments/cm.
Claim 19
Dependent Claim
24 words
A vibratory diaphragm for a loudspeaker as claimed in claim 1, wherein the cross sectional area of the filament is 0.0003-0.1 mm 2 .
Claim 20
Dependent Claim
17 words
A vibratory diaphragm for a loudspeaker as claimed in claim 1, wherein the fabric is non-woven fabric.
Claim 21
Dependent Claim
42 words
A vibratory diaphragm for a loudspeaker as claimed in claim 1, wherein the content of the polyimide resin is 35-65% by volume, the content of the graphite granules is 5-30% by volume and the content of the fabric is 20-50% by volume.
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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) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |