US3564163A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ribbon loudspeaker
Assignee: Individual
•
Filing: 1967-04-20
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Granted: 1971-02-16
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Expires: 1987-04-20
Abstract
Abstract This disclosure describes a ribbon-type loudspeaker having a ribbon carrying voice currents and being positioned between magnetic poles. Various means to attenuate or eliminate standing waves on the ribbon are shown.
Inventors
- 👤 Gilbert L Hobrough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:22
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/04; H04R9/046; H04R9/047; H04R9/048
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
90 words
In a ribbon loudspeaker having a sound radiating conductor suspended between magnetic poles, said sound radiating conductor having supported terminal sections and a suspended centralized section therebetween, the improvement comprising: motion reduction means coextending longitudinally with said suspended centralized section from each terminal section to a point less than half way across said suspended centralized section, and coacting with said terminal sections for reducing the motion of said suspended centralized section to a degree which progressively decreases from said supported terminal sections toward the center of said suspended centralized section.
Claim 2
Dependent Claim
90 words
In a ribbon loudspeaker having a sound radiating conductor suspended between magnetic poles, said sound radiating conductor having supported terminal sections and a suspended centralized section therebetween, the improvement comprising: motion reduction means coextending longitudinally with said suspended centralized section from each terminal section to a point less than half way across said suspended centralized section, and coacting with said terminal sections for reducing the motion of said suspended centralized section to a degree which progressively decreases from said supported terminal sections toward the center of said suspended centralized section.
Claim 3
Dependent Claim
45 words
The combination as set forth in claim 1 wherein said motion reduction means comprises means for reducing the electromotive forces applied to end portions of said suspended centralized section of said sound radiating conductor relative to the electromotive forces applied to more centralized portions thereof.
Claim 4
Dependent Claim
43 words
The combination as set forth in claim 1 wherein said motion reduction means includes means for reducing the magnetic flux density in the region of end portions of said suspended centralized section of said sound radiating conductor relative to more centralized sections thereof.
Claim 5
Dependent Claim
47 words
The combination as set forth in claim 3 wherein said means for reducing the magnetic flux progressively decreases the intensity of said flux along the length of said suspended centralized section of said sound radiating conductor to produce an absence of flux at the support terminal sections.
Claim 6
Dependent Claim
41 words
The combination as set forth in claim 3 wherein said means for reducing the magnetic flux comprises means for diverting flux produced by said magnetic poles away from the end portions of said suspended centralized section of said sound radiating conductor.
Claim 7
Dependent Claim
34 words
The combination as set forth in claim 5 wherein said means for diverting comprises at least one magnetic shunt positioned to virtually eliminate flux at the supported terminal sections of said sound radiating conductor.
Claim 8
Dependent Claim
42 words
The combination as set forth in claim 1 wherein said motion reduction means comprises means for increasing the mass per unit length of the end portions of said suspended centralized section of said sound radiating conductor relative to more centralized sections thereof.
Claim 9
Dependent Claim
57 words
The combination as set forth in claim 3 wherein said means for reducing the magnetic flux comprises a pair of magnetic shunts and means for positioning said shunts beyond the suspended centralized section of said sound radiating conductor for sharply reducing the magnetic flux applied to end portions of said centralized section of said sound radiating conductor.
Claim 10
Dependent Claim
21 words
The combination as set forth in claim 8 wherein said magnetic shunts constitute support means for supporting said sound radiating conductor.
Claim 11
Dependent Claim
36 words
The combination as set forth in claim 1 wherein said motion reduction means comprises means for dissipating mechanical energy of wave motion of the end portions of said suspended centralized section of said sound radiating conductor.
Claim 12
Dependent Claim
34 words
The combination as set forth in claim 10 wherein said means for dissipating comprises a mass of viscous material positioned upon the end portions of said suspended centralized section of said sound radiating conductor.
Claim 13
Dependent Claim
34 words
The combination as set forth in claim 3 wherein said motion reduction means includes a mass of viscous material positioned upon the end portions of said suspended centralized section of said sound radiating conductor.
Claim 14
Dependent Claim
44 words
The combination as set forth in claim 1 wherein at least one pole is magnetized to produce reduced flux density at the end portions of said suspended Centralized section of said second radiating conductor relative to the flux density at more centralized portions thereof.
Claim 15
Dependent Claim
28 words
The combination as set forth in claim 13 wherein said magnetized pole has a flux density distribution along the length thereof which approximates half of a sine wave.
Claim 16
Dependent Claim
31 words
The combination as set forth in claim 13 further including means for dissipating mechanical energy of wave motion of end portions of the suspended centralized section of said sound radiating conductor.
Claim 17
Dependent Claim
34 words
The combination as set forth in claim 15 wherein said means for dissipating comprises a mass of viscous material positioned upon the end portions of said suspended centralized section of said sound radiating conductor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |