GB374335A - Improvements in electrodynamic loud speakers - Google Patents
Improvements in electrodynamic loud speakersInfo
- Publication number
- GB374335A GB374335A GB2382231A GB2382231A GB374335A GB 374335 A GB374335 A GB 374335A GB 2382231 A GB2382231 A GB 2382231A GB 2382231 A GB2382231 A GB 2382231A GB 374335 A GB374335 A GB 374335A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil
- pole
- magnetic field
- loud speakers
- support
- 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
- H04R9/04—Construction, mounting, or centering of coil
Abstract
374,335. Loud speakers. THORNTON, A. A., 7, Essex Street, Strand, London. -(Magnavox Co. ; Oakland, California, U.S.A.) Aug. 24, 1931, No. 23822. [Class 40 (iv).] The coil 14 attached to the diaphragm 15 of a moving-coil loudspeaker is substantially longer than the depth of the annular air gap in the magnetic field in which the coil is located. Thus the end portions of the coil are always outside the influence of the field, and a uniform number of turns in the coil is maintained in the magnetic field as the coil vibrates. With this arrangement, the impedance remains constant, and lowfrequency response is improved. In the construction shown, the coil 14 is centred by a support 16 in the annular gap between the central pole 12 and the surrounding pole 11 of a pot magnet. The end of the inner pole 12 is formed as a disc-like member of the same thickness as the plate 11, though this detail is not shown in the Figure. The ends of the coil are brought along the support 16 to terminals 18, 19.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2382231A GB374335A (en) | 1931-08-24 | 1931-08-24 | Improvements in electrodynamic loud speakers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2382231A GB374335A (en) | 1931-08-24 | 1931-08-24 | Improvements in electrodynamic loud speakers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB374335A true GB374335A (en) | 1932-06-09 |
Family
ID=10201866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2382231A Expired GB374335A (en) | 1931-08-24 | 1931-08-24 | Improvements in electrodynamic loud speakers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB374335A (en) |
-
1931
- 1931-08-24 GB GB2382231A patent/GB374335A/en not_active Expired
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