GB214787A - Improvements in or relating to telephone receivers - Google Patents
Improvements in or relating to telephone receiversInfo
- Publication number
- GB214787A GB214787A GB640023A GB640023A GB214787A GB 214787 A GB214787 A GB 214787A GB 640023 A GB640023 A GB 640023A GB 640023 A GB640023 A GB 640023A GB 214787 A GB214787 A GB 214787A
- Authority
- GB
- United Kingdom
- Prior art keywords
- casing
- core
- soft iron
- fixed
- 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
- H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
- H04R13/02—Telephone receivers
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
214,787. Dungey, J. W. March 6, 1923. Magnetic instruments.-In a telephone receiver in which the casing is of magnetized metal and encloses a core and coil winding, the casing A constitutes the sole permanent magnet and a core X or cores of soft iron is directly attached and fixed to the casing, the coil winding C being detained in a fixed position relative to the casing. The ends of the coil are led to insulated terminals F on the casing. The core X may be formed of soft iron wires; or it may be tubular and a central core Z be screw-threaded within the core for adjustment by means of an external nut or lever. The casing may be magnetized with one pole all round the rim against which the diaphragm is clamped and the other pole in the centre to which the soft iron core is fixed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB640023A GB214787A (en) | 1923-03-06 | 1923-03-06 | Improvements in or relating to telephone receivers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB640023A GB214787A (en) | 1923-03-06 | 1923-03-06 | Improvements in or relating to telephone receivers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB214787A true GB214787A (en) | 1924-05-01 |
Family
ID=9813812
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB640023A Expired GB214787A (en) | 1923-03-06 | 1923-03-06 | Improvements in or relating to telephone receivers |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB214787A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2419697A (en) * | 1943-11-19 | 1947-04-29 | Hettie Dent | Electromagnetic telephone receiver |
-
1923
- 1923-03-06 GB GB640023A patent/GB214787A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2419697A (en) * | 1943-11-19 | 1947-04-29 | Hettie Dent | Electromagnetic telephone receiver |
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