GB242737A - Improvements in or relating to telephone receivers - Google Patents
Improvements in or relating to telephone receiversInfo
- Publication number
- GB242737A GB242737A GB21585/24A GB2158524A GB242737A GB 242737 A GB242737 A GB 242737A GB 21585/24 A GB21585/24 A GB 21585/24A GB 2158524 A GB2158524 A GB 2158524A GB 242737 A GB242737 A GB 242737A
- Authority
- GB
- United Kingdom
- Prior art keywords
- shell
- cores
- magnetic
- opposite polarity
- diaphragm
- 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)
- Toys (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
242,737. Dungey, J. W. Sept. 12, 1924. Magnetic instruments.-In a telephone receiver of the kind having a shell or rear part f which constitutes a permanently magnetized portion of the magnetic system, the shell is so magnetized as to have two or more independent magnetic systems therein, each system preferably including as a part of its circuit a core, which is associated. with one part cf the shell and is of opposite polarity to that of an adjacent core associated with another part of the shell. In the construction shown, the shell has two permanentlymagnetized portions a, b, a<1>, b<1> associated respectively with cores y z of opposite polarity, and an induced magnetic field is created within the part b, a<1>. The diaphragm c is secured in position within the ear-piece by a screw-threaded ring g, and its distance from the cores may be varied by making the diaphragm itself, or the cores, or parts of the cores ,adjustable.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB21585/24A GB242737A (en) | 1924-09-12 | 1924-09-12 | Improvements in or relating to telephone receivers |
| US78774A US1587289A (en) | 1924-09-12 | 1926-01-02 | Telephone receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB21585/24A GB242737A (en) | 1924-09-12 | 1924-09-12 | Improvements in or relating to telephone receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB242737A true GB242737A (en) | 1925-11-19 |
Family
ID=10165372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB21585/24A Expired GB242737A (en) | 1924-09-12 | 1924-09-12 | Improvements in or relating to telephone receivers |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US1587289A (en) |
| GB (1) | GB242737A (en) |
-
1924
- 1924-09-12 GB GB21585/24A patent/GB242737A/en not_active Expired
-
1926
- 1926-01-02 US US78774A patent/US1587289A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US1587289A (en) | 1926-06-01 |
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