US5031720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speaker diaphragm
Assignee: Kenwood KK
•
Filing: 1988-11-28
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Granted: 1991-07-16
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Expires: 2008-11-28
Abstract
Abstract A speaker diaphragm is formed by heat-pressurized molding a composite structure of fabric cloth and resin sank into the fabric cloth. The fabric cloth is woven from high strength and high elasticity polyethylene fiber which has at least tensile modulus of 4,500 kg/mm 2 (500 g/d).
Inventors
- 👤 Shuhei Ohta
- 👤 Masakatu Sakamoto
- 👤 Shiro Iwakura
- 👤 Yoshikazu Shirasaki
- 👤 Ichiro Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:53
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/2861; Y10T442/291; Y10T442/30; Y10T442/3179; Y10T442/322; Y10T442/3228; Y10T442/326; Y10T442/3472
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
53 words
A speaker diaphragm comprising fabric and thermoset resin sunk into said fabric, the fabric being woven to constitute a matrix in a diaphragm, characterized in that said fabric is of polyethylene fiber, said thermoset resin is of vinyl-ester and/or unsaturated polyester, and a sound velocity of the diaphragm is at least 2,800 m/sec.
Claim 2
Dependent Claim
53 words
A speaker diaphragm comprising fabric and thermoset resin sunk into said fabric, the fabric being woven to constitute a matrix in a diaphragm, characterized in that said fabric is of polyethylene fiber, said thermoset resin is of vinyl-ester and/or unsaturated polyester, and a sound velocity of the diaphragm is at least 2,800 m/sec.
Claim 3
Dependent Claim
30 words
A speaker diaphragm according to claim 1, wherein said fiber is high strength and high elasticity polyethylene fiber which has at least tensile strength of 180 kg/mm 2 (20 g/d).
Claim 4
Dependent Claim
31 words
A speaker diaphragm according to claim 1, wherein the diaphragm is molded into a cone having a neck and a heat-resistance layer is laminated at a neck part of the cone.
Claim 5
Dependent Claim
23 words
A speaker diaphragm according to claim 1 further comprising a back layer laminated to said unitary structure of polyethylene fiber fabric and resin.
Claim 6
Dependent Claim
44 words
A speaker diaphragm according to claim 4, wherein said back layer is a resin layer reinforced by fabric woven from at least one selected from a group of carbon fiber, glass fiber, silicon carbide fiber, fully aromatic polyamide fiber and fully aromatic polyester fiber.
Claim 7
Dependent Claim
16 words
A speaker diaphragm according to claim 4, wherein said back layer is a paper gulp layer.
Claim 8
Dependent Claim
37 words
A speaker diaphragm according to claim 1, wherein said fabric is cross-woven from a first yarn of high strength and high elasticity polyethylene fiber and a second yard of fiber different in characteristics from said polyethylene fiber.
Claim 9
Dependent Claim
17 words
A speaker diaphragm according to claim 7, wherein the fiber of said second yarn is a carbon.
Claim 10
Dependent Claim
18 words
A speaker diaphragm according to claim 7, wherein the fiber of said second yarn is fully aromatic polyamide.
Claim 11
Dependent Claim
20 words
A speaker diaphragm according to claim 7, wherein the fiber of said second yarn is a highly extended polyvinyl alcohol.
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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) | 1994-07-15 | 1995-01-14 | 1995-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-15 | 1999-01-14 | 1999-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-15 | 2003-01-14 | 2003-07-16 | $7700.00 | Window Closed / Lapsed |