US4076098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker diaphragm
Assignee: B&W Loudspeakers Ltd
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Filing: 1976-03-15
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Granted: 1978-02-28
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Expires: 1996-03-15
Abstract
Abstract This invention relates to loudspeaker diaphragms and methods of making such diaphragms. It is an object of the invention to improve damping of standing waves formed in a loudspeaker diaphragm. To this end a diaphragm in accordance with the invention is made of textile material impregnated with a stiffening material which does not completely fill the spaces between the threads of the textile material, said spaces being partially filled with damping material. The textile material is preferably a woven glass-fiber fabric or a fabric woven or knitted from an aramid fiber. The stiffening material is preferably a synthetic resin, for example, a phenolic, epoxy or melamine resin and the damping material is preferably a polyvinyl-acetate emulsion or a vinyl resin-based thermoplastic material of the kind used as a cone edge dampener.
Inventors
- 👤 Dennis Charles Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:03
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; B; B29; B29C; B29C70/00; B29C70/003; B29C70/0035; B29C70/04; B29C70/06; B29C70/10; B29C70/16; B29C70/22; B29C70/222; H04R7/26; H04R2231/00; H04R2231/001; H04R2307/00; H04R2307/025; H04R2307/029
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
73 words
A loudspeaker diaphragm comprising: (a) a textile material having spaces between adjacent threads, (b) an impregnant stiffening material for stiffening the threads and which does not completely fill the spaces between the threads of the textile material, the impregnant comprising a first synthetic resin, and (c) a damping material at least partially filling the spaces, the damping material comprising a second synthetic resin, and wherein said damping material is different from said impregnant.
Claim 2
Dependent Claim
73 words
A loudspeaker diaphragm comprising: (a) a textile material having spaces between adjacent threads, (b) an impregnant stiffening material for stiffening the threads and which does not completely fill the spaces between the threads of the textile material, the impregnant comprising a first synthetic resin, and (c) a damping material at least partially filling the spaces, the damping material comprising a second synthetic resin, and wherein said damping material is different from said impregnant.
Claim 3
Dependent Claim
17 words
A diaphragm as claimed claim 1, wherein the said textile material is a woven glass fibre fabric.
Claim 4
Dependent Claim
21 words
A diaphragm as claimed in claim 1, wherein said textile material is a fabric woven or knitted from an aramid fibre.
Claim 5
Dependent Claim
18 words
A diaphragm as claimed in claim 1, wherein the stiffening material is a phenolic, epoxy or melamine resin.
Claim 6
Dependent Claim
15 words
A diaphragm as claimed in claim 1, wherein said damping material is a polyvinyl-acetate emulsion.
Claim 7
Independent Claim
82 words
A method for forming a loudspeaker, comprising: (a) providing a textile material having spaces between adjacent threads, (b) applying an impregnant to stiffen the textile, the impregnant being applied such that it does not fill up the spaces and comprising a first synthetic resin, (c) coating the impregnated textile with a damping material to at least partially fill up the spaces, the damping material comprising a second synthetic resin, and wherein the first synthetic resin is different from the second synthetic resin.
Claim 8
Independent Claim
82 words
A method for forming a loudspeaker, comprising: (a) providing a textile material having spaces between adjacent threads, (b) applying an impregnant to stiffen the textile, the impregnant being applied such that it does not fill up the spaces and comprising a first synthetic resin, (c) coating the impregnated textile with a damping material to at least partially fill up the spaces, the damping material comprising a second synthetic resin, and wherein the first synthetic resin is different from the second synthetic resin.
Claim 9
Dependent Claim
17 words
A method as claimed in claim 6, wherein said textile material is a woven glass fibre fabric.
Claim 10
Dependent Claim
21 words
A method as claimed in claim 6, wherein said textile material is a fabric woven or knitted from an aramid fibre.
Claim 11
Dependent Claim
18 words
A method as claimed in claim 6, wherein the stiffening material is a phenolic, epoxy or melamine resin.
Claim 12
Dependent Claim
15 words
A method as claimed in claim 6, wherein said damping material is a polyvinyl-acetate emulsion.
References Cited (Backward Citations)
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Cited
US2171389A
Cited
US2549091A
Cited
US3093207A
Cited
US3627567A
Cited
US3937905A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |