US3834486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibration diaphragm and cone edge of a loudspeaker
Assignee: Sekisui Chemical Co Ltd
•
Filing: 1972-05-30
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Granted: 1974-09-10
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Expires: 1992-05-30
Abstract
Abstract Herein disclosed are an improved vibration diaphragm and an improved cone edge of a loudspeaker, wherein the vibration diaphragm is formed of a foamed plastics which is formed with portions having a density or densities lower than the remaining portion of the diaphragm and/or which has at least one coating of resin applied to at least one surface of the foamed plastics in the form of an aqueous emulsion and wherein the cone edge is formed of a foamed plastics having a closed-cellular structure. The vibration diaphragm and cone edge, which may preferably be used in combination with each other, will contribute to improving the acoustic characteristics of the loudspeaker to a considerable extent.
Inventors
- 👤 Y Tsuge
- 👤 N Koizumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:52
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/12; H04R7/122; H04R31/00; H04R31/003; H04R7/125; H04R7/16; H04R7/18; H04R7/20; H04R2307/00; H04R2307/029
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
42 words
A conical vibrating diaphragm of a foamed thermoplastic resin for a loudspeaker having a multiplicity of separate spaced portions in each of which the density of said foamed thermoplastic resin is lower than the density of the remaining portion of said diaphragm.
Claim 2
Dependent Claim
42 words
A conical vibrating diaphragm of a foamed thermoplastic resin for a loudspeaker having a multiplicity of separate spaced portions in each of which the density of said foamed thermoplastic resin is lower than the density of the remaining portion of said diaphragm.
Claim 3
Dependent Claim
18 words
A conical vibration diaphragm as claimed in claim 1, in which said thermoplastic resin is an acrylic resin.
Claim 4
Dependent Claim
17 words
A conical vibration diaphragm as claimed in claim 1, in which said spaced portions are substantially circular.
Claim 5
Dependent Claim
17 words
A conical vibration diaphragm as claimed in claim 1, in which said spaced portions are substantially polygonal.
Claim 6
Dependent Claim
35 words
A conical vibration diaphragm as claimed in claim 1, in which at least one surface of said diaphragm is coated with at least one uniform layer of a resin applied as an aqueous emulsion thereof.
Claim 7
Dependent Claim
23 words
A conical vibration diaphragm as claimed in claim 5, in which the resin of said at least one layer is a thermoplastic resin.
Claim 8
Dependent Claim
23 words
A conical vibration diaphragm as claimed in claim 5, in which the resin of said at least one layer is a rubber resin.
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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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |