GB245727A - Improvements in or relating to loud-speakers or ear-phones for wireless reception and other applications - Google Patents
Improvements in or relating to loud-speakers or ear-phones for wireless reception and other applicationsInfo
- Publication number
- GB245727A GB245727A GB25333/25A GB2533325A GB245727A GB 245727 A GB245727 A GB 245727A GB 25333/25 A GB25333/25 A GB 25333/25A GB 2533325 A GB2533325 A GB 2533325A GB 245727 A GB245727 A GB 245727A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnet
- diaphragm
- loud
- speakers
- ear
- 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)
Abstract
245,727. Soc. Anon. des Brevets K.ornfeld, (Assignees of Kornfeld, A.). Jan. 9, 1925, [Convention date]. Telephones.-In a loudspeaker or earphone comprising an iron diaphragm 4, a magnet 2 polarized at its centre and periphery, a softiron core 6, and a central rod 7 adjustable so as to vary the air gap between its inner end and the diaphragm, the peripheries of the magnet 2 and the diaphragm 4 are connected by a cylindrical sheet-iron ring 3. The winding 9 is fixed. In a modification the core 6 is flush with the inner side of the magnet 2, but projects slightly beyond its outer side; in this construction the size of the coil 9 may be increased. The parts 2, 3 may be slit to eliminate Foucault currents. The system may be enclosed in a non- magnetic box 1.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH245727X | 1925-01-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB245727A true GB245727A (en) | 1926-04-08 |
Family
ID=4465106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB25333/25A Expired GB245727A (en) | 1925-01-09 | 1925-10-10 | Improvements in or relating to loud-speakers or ear-phones for wireless reception and other applications |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB245727A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4151379A (en) * | 1978-03-01 | 1979-04-24 | Ashworth William J | Electromagnetic speaker with bucking parallel high and low frequency coils drives sounding board and second diaphragm or external apparatus via magnetic coupling and having adjustable air gap and slot pole piece |
-
1925
- 1925-10-10 GB GB25333/25A patent/GB245727A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4151379A (en) * | 1978-03-01 | 1979-04-24 | Ashworth William J | Electromagnetic speaker with bucking parallel high and low frequency coils drives sounding board and second diaphragm or external apparatus via magnetic coupling and having adjustable air gap and slot pole piece |
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