Patent US4562899A successfully refreshed from Google Patents.
US4562899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm of electroacoustic transducer and method of manufacturing the same
Assignee: Yamaha Corp
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Filing: 1983-06-14
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Granted: 1986-01-07
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Expires: 2003-06-14
Abstract
Abstract A diaphragm of a loudspeaker is made up of a plurality of laminated composite sheets each including a number of fibers, for example, carbon fibers having a high Young's modulus to density ratio, and a matrix bonding together the fibers. Each composite sheet is divided into a plurality of adjoining sections formed by dividing the composite sheet about the center axis of the diaphragm. The divided composite sheets are laminated such that joints between adjacent sections of one composite sheet do not overlap joints between adjacent sections of the other composite sheet. In other embodiments a similar composite sheet is spirally bonded to the outer surface of the diaphragm or rings having different diameters and made of similar composite sheet are coaxially bonded along the outer surface of the diaphragm.
Inventors
- 👤 Akira Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:07
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/12; H04R7/122; H04R31/00; H04R31/003; Y; Y10; Y10T; Y10T428/00; Y10T428/19; Y10T428/192; Y10T428/21; Y10T428/24; Y10T428/24355; Y10T428/24471
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
121 words
A diaphragm of an electroacoustic transducer comprising a plurality of composite sheets each including fibers having a high Young's modulus to density ratio and a matrix bonding together said fibers, said composite sheets being laminated into an integral structure, each composite sheet further comprising a plurality of adjoining sections having joints therebetween and formed by dividing the composite sheet about a central axis of said diaphragm, said composite sheets further being laminated such that the joints between the adjoining sections of one composite sheet are not disposed circumferentially at the same positions as the joints between the adjoining sections of the other composite sheet, such joints being of sufficient mechanical strength to withstand the vibrations encountered in service in a diaphragm.
Claim 2
Dependent Claim
121 words
A diaphragm of an electroacoustic transducer comprising a plurality of composite sheets each including fibers having a high Young's modulus to density ratio and a matrix bonding together said fibers, said composite sheets being laminated into an integral structure, each composite sheet further comprising a plurality of adjoining sections having joints therebetween and formed by dividing the composite sheet about a central axis of said diaphragm, said composite sheets further being laminated such that the joints between the adjoining sections of one composite sheet are not disposed circumferentially at the same positions as the joints between the adjoining sections of the other composite sheet, such joints being of sufficient mechanical strength to withstand the vibrations encountered in service in a diaphragm.
Claim 3
Dependent Claim
33 words
The diaphragm of an electroacoustic transducer according to claim 1 wherein the fibers of each composite sheet extend in a substantially radial direction with respect to the direction of vibration of said diaphragm.
Claim 4
Dependent Claim
35 words
The diaphragm of an electroacoustic transducer according to claim 1 wherein said fibers are selected from the group consisting of glass fibers, carbon fibers, graphite fibers, boron fibers, silicon carbide fibers and aromatic polyamide fibers.
Claim 5
Dependent Claim
28 words
The diaphragm of an electroacoustic transducer according to claim 2 wherein circumferential side edge portions of said adjoining sections are bonded together so that they are not overlapped.
Claim 6
Dependent Claim
68 words
The diaphragm of an electroacoustic transducer according to claim 1 which further comprises a stripe-shaped composite sheet constituted by a plurality of fibers extending in the same direction and a matrix bonding together said fibers, said stripe-shaped composite sheet being laminated to a surface of one of said composite sheets with the fibers in said stripe-shaped composite sheet being substantially orthogonal to the fibers in said composite sheets.
Claim 7
Dependent Claim
28 words
The diaphragm of an electroacoustic transducer according to claim 5, said stripe-shaped composite sheet extending spirally along said surface of one of said composite sheets of said diaphragm.
Claim 8
Dependent Claim
60 words
The diaphragm of an electroacoustic transducer according to claim 1 which further comprises a plurality of ring-shaped composite sheets of different diameters which are bonded to a surface of one of said composite sheets of said diaphragm, each of said ring-shaped composite sheets comprising a plurality of fibers extending in a circumferential direction about said central axis of said diaphragm.
Claim 9
Dependent Claim
22 words
The diaphragm of an electroacoustic transducer according to claim 5 which further comprises a flange bonded to a periphery of said diaphragm.
Claim 10
Dependent Claim
23 words
The diaphragm of an electroacoustic transducer according to claim 5 which further comprises a rib bonded to a neck portion of said diaphragm.
Claim 11
Dependent Claim
126 words
A diaphragm of an electroacoustic transducer comprising a plurality of composite sheets including fibers having a high Young's modulus to density ratio and a matrix bonding together said fibers, said composite sheet being laminated into an integral structure, said composite sheet including a plurality of adjoining sections formed by dividing the composite sheet about a center axis of said diaphragm, and a stripe-shaped composite sheet constituted by a plurality of fibers extending in the same direction and a matrix bonding together said fibers, said stripe-shaped composite sheet being arranged circumferentially on a surface of one of said composite sheets of said diaphragm and being laminated to said surface with said fibers on said stripe-shaped composite sheet being substantially orthogonal to said fibers in said composite sheets.
Claim 12
Dependent Claim
126 words
A diaphragm of an electroacoustic transducer comprising a plurality of composite sheets including fibers having a high Young's modulus to density ratio and a matrix bonding together said fibers, said composite sheet being laminated into an integral structure, said composite sheet including a plurality of adjoining sections formed by dividing the composite sheet about a center axis of said diaphragm, and a stripe-shaped composite sheet constituted by a plurality of fibers extending in the same direction and a matrix bonding together said fibers, said stripe-shaped composite sheet being arranged circumferentially on a surface of one of said composite sheets of said diaphragm and being laminated to said surface with said fibers on said stripe-shaped composite sheet being substantially orthogonal to said fibers in said composite sheets.
Claim 13
Dependent Claim
31 words
The diaphragm of an electroacoustic transducer according to claim 10 wherein said stripe-shaped composite sheet is spirally wound on the surface of said one of said composite sheets of said diaphragm.
Claim 14
Dependent Claim
58 words
The diaphragm of an electroacoustic transducer according to claim 10 wherein said stripe-shaped composite sheet comprises a plurality of ring-shaped composite sheets of different diameters which are bonded to the surface of said diaphragm, each of said ring-shaped composite sheets comprising a plurality of reinforced fibers extending in a circumferential direction about said center axis of said diaphragm.
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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) | 1989-01-06 | 1989-07-08 | 1990-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-06 | 1993-07-08 | 1994-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-06 | 1997-07-08 | 1998-01-07 | $7700.00 | Window Closed / Lapsed |