GB368708A - Improvements in loud speakers of the moving coil type - Google Patents
Improvements in loud speakers of the moving coil typeInfo
- Publication number
- GB368708A GB368708A GB3624930A GB3624930A GB368708A GB 368708 A GB368708 A GB 368708A GB 3624930 A GB3624930 A GB 3624930A GB 3624930 A GB3624930 A GB 3624930A GB 368708 A GB368708 A GB 368708A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bar
- magnet
- diaphragm
- polepiece
- pole
- 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)
- Magnetic Treatment Devices (AREA)
- Measuring Magnetic Variables (AREA)
- Developing Agents For Electrophotography (AREA)
Abstract
368,708. Loud-speakers. LANCHESTER, F. W., Dyott End, Oxford Road, Moseley, Birmingham. Dec. 2, 1930, No. 36249. [Class 40 (iv).] In a moving-coil instrument the outer pole of the annular field gap is formed in a bar which is clamped to a baffle-board containing the diaphragm and the inner pole is centred by a ring of non-magnetic material. In a permanent magnet instrument the bar-magnet 2, Fig. 2, flux-carrying members 5, and polebar 1 are clamped together by bolts 6, which also tighten the central polepiece 3 against a brass tube 4, Fig. 1, carried on a shoulder on the inner polepiece 3 and fitting a recess in the pole-bar 1. In a modification the members 5 are dispensed with, the magnet ends being bent round to engage the bar 1. When the diaphragm is conical the bar 1 carrying the magnet assembly is bolted through the spacing chocks 8, Figs. 6 and 7, to the baffle board 7. When a flat diaphragm is used the bar 1 is bolted directly to the baffle board. The permanent magnet may be replaced by a soft iron or mild steel bars or yoke, and the assembly excited by a winding round the central polepiece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3624930A GB368708A (en) | 1930-12-02 | 1930-12-02 | Improvements in loud speakers of the moving coil type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3624930A GB368708A (en) | 1930-12-02 | 1930-12-02 | Improvements in loud speakers of the moving coil type |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB368708A true GB368708A (en) | 1932-03-02 |
Family
ID=10386364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3624930A Expired GB368708A (en) | 1930-12-02 | 1930-12-02 | Improvements in loud speakers of the moving coil type |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB368708A (en) |
-
1930
- 1930-12-02 GB GB3624930A patent/GB368708A/en not_active Expired
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