GB442900A - Improvements in or relating to permanent magnet assemblies - Google Patents
Improvements in or relating to permanent magnet assembliesInfo
- Publication number
- GB442900A GB442900A GB2661434A GB2661434A GB442900A GB 442900 A GB442900 A GB 442900A GB 2661434 A GB2661434 A GB 2661434A GB 2661434 A GB2661434 A GB 2661434A GB 442900 A GB442900 A GB 442900A
- Authority
- GB
- United Kingdom
- Prior art keywords
- annular
- polepiece
- gap
- plate
- shunt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/025—Magnetic circuit
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Surgical Instruments (AREA)
Abstract
442,900. Magnets. ENGLISH STEEL CORPORATION, Ltd., Vickers Works, and SWAN, J. C., 74, Totley Brook. Road, Dore, both in Sheffield. Sept. 17, 1934, No. 26614. [Class 35] [See also Group XXXIX] A permanent magnet for loud-speakers &c. has two coaxial annular air gaps in series, the inner gap being shunted by a piece of magnetic material so arranged that the flux across the two gaps is in the required proportions. In the arrangement shown, an annular magnet 15 is provided with a plate 21 forming an outer polepiece for the outer air gap and a base plate 10. To the plate 10 are secured a central stem 12, which may be of magnet steel, carrying a central polepiece 13, and an annular member 16 carrying an annular polepiece 19 and serving as a shunt for the gap between the members 13 and 19. A ring 25 of non-magnetic material may be introduced to increase the reluctance of the shunt, or the shunt may be of such size as to be normally saturated. A coil 32 in the inner gap is carried by a diaphragm 29 attached by a ring 31 to a cone 27 mounted on the annular polepiece 19 and a coil 38 in the outer gap is carried by a diaphragm 37 attached by rings 34:, 35 to arms 33 mounted on the plate 21. In a modification, the diaphragm 29 is supported by arms attached to the ring 35 and is separate from the cone 27, which is retained as a baffle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2661434A GB442900A (en) | 1934-09-17 | 1934-09-17 | Improvements in or relating to permanent magnet assemblies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2661434A GB442900A (en) | 1934-09-17 | 1934-09-17 | Improvements in or relating to permanent magnet assemblies |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB442900A true GB442900A (en) | 1936-02-18 |
Family
ID=10246391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2661434A Expired GB442900A (en) | 1934-09-17 | 1934-09-17 | Improvements in or relating to permanent magnet assemblies |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB442900A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2638510A (en) * | 1949-01-06 | 1953-05-12 | Caesar David Zeitouni | Duplex loud-speaker |
| DE1281600B (en) * | 1958-06-25 | 1968-10-31 | Magnetfab Bonn Gmbh | Annular gap magnet system with high field strength in which a coil moves in the air gap |
| US4256930A (en) * | 1978-02-22 | 1981-03-17 | Tannoy Products Limited | Loudspeaker having improved magnetic assembly |
| GB2153628A (en) * | 1984-01-27 | 1985-08-21 | Tannoy Ltd | Moving coil loudspeaker |
| GB2261135A (en) * | 1991-11-02 | 1993-05-05 | Meir Mordechai | A loudspeaker |
-
1934
- 1934-09-17 GB GB2661434A patent/GB442900A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2638510A (en) * | 1949-01-06 | 1953-05-12 | Caesar David Zeitouni | Duplex loud-speaker |
| DE1281600B (en) * | 1958-06-25 | 1968-10-31 | Magnetfab Bonn Gmbh | Annular gap magnet system with high field strength in which a coil moves in the air gap |
| US4256930A (en) * | 1978-02-22 | 1981-03-17 | Tannoy Products Limited | Loudspeaker having improved magnetic assembly |
| GB2153628A (en) * | 1984-01-27 | 1985-08-21 | Tannoy Ltd | Moving coil loudspeaker |
| GB2261135A (en) * | 1991-11-02 | 1993-05-05 | Meir Mordechai | A loudspeaker |
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