Patent US4049926A successfully refreshed from Google Patents.
US4049926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ribbon loudspeaker achieves focusing and uniformity of the magnetic flux in the working gap
Assignee: Individual
•
Filing: 1976-01-05
•
Granted: 1977-09-20
•
Expires: 1996-01-05
Abstract
Abstract A ribbon loudspeaker, according to the invention, comprises permanent magnets spaced from each other along an axis and making up a magnetic system, and sound-reproducing ribbons freely vibrating, independent of each other placed in a working gap between the poles of permanent magnets. The side surfaces of the permanent magnets are made convex and spaced from the axis, whereas their pole surfaces are made concave and spaced along the axis. The permanent magnets are magnetized by way of separate magnetization of their central parts in the plane of a sound-reproducing ribbon and portions adjoining their side surfaces. The proposed ribbon loudspeaker ensures higher fidelity of sound.
Inventors
- 👤 Alexei Fedoseevich Kasatkin
- 👤 Jury Vasilievich Smirnov
- 👤 Ilya Afanasievich Feldman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:23
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/04; H04R9/046; H04R9/047; H04R9/048
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
86 words
A ribbon loudspeaker comprising at least two permanent magnets together making up a magnetic system, said magnets being spaced from each other generally along an axis, each permanent magnet having a pair of generally convex opposing side surfaces spaced from said axis, and having a pair of generally concave opposing pole surfaces spaced from each other along said axis, the facing concave pole surfaces of two adjacent permanent magnets together defining a working gap; and a freely vibrating sound reproducing ribbon positioned in said working gap.
Claim 2
Dependent Claim
86 words
A ribbon loudspeaker comprising at least two permanent magnets together making up a magnetic system, said magnets being spaced from each other generally along an axis, each permanent magnet having a pair of generally convex opposing side surfaces spaced from said axis, and having a pair of generally concave opposing pole surfaces spaced from each other along said axis, the facing concave pole surfaces of two adjacent permanent magnets together defining a working gap; and a freely vibrating sound reproducing ribbon positioned in said working gap.
Claim 3
Dependent Claim
16 words
A ribbon loudspeaker as defined in claim 1, wherein said axis comprises an axis of symmetry.
Claim 4
Dependent Claim
54 words
A ribbon loudspeaker as defined in claim 1, wherein a plurality of similarly-shaped permanent magnets are provided and spaced from each other along said axis, each pair of facing concave pole surfaces of two adjacent permanent magnets together defining a working gap, and a freely vibrating sound reproducing ribbon positioned in each working gap.
Claim 5
Dependent Claim
21 words
A ribbon loudspeaker as defined in claim 1, wherein said convex side surfaces are disposed on opposite sides of said axis.
Claim 6
Dependent Claim
30 words
A ribbon loudspeaker as defined in claim 1, wherein said convex side surfaces are generally parallel to said axis, and said concave pole surfaces are generally orthogonal to said axis.
Claim 7
Dependent Claim
17 words
A ribbon loudspeaker as defined in claim 1, wherein said ribbon is disposed generally along said axis.
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) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |