GB738029A - Improvements relating to electromagnetic telephone instruments - Google Patents
Improvements relating to electromagnetic telephone instrumentsInfo
- Publication number
- GB738029A GB738029A GB276853A GB276853A GB738029A GB 738029 A GB738029 A GB 738029A GB 276853 A GB276853 A GB 276853A GB 276853 A GB276853 A GB 276853A GB 738029 A GB738029 A GB 738029A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnet
- pole
- shoes
- jan
- slots
- 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
Abstract
738,029. Receivers. SIEMENS BROS. & CO., Ltd. Jan. 22, 1954 [Jan. 30, 1953], No. 2768/53. Class 40 (4). In an electromagnetic telephone instrument comprising at least one permanent magnet 13 and a pair of pole-shoes 12 of rectangular crosssection projecting from the magnet ends, the pole-shoes 12 which have a major cross-sectional dimension equal to the depth of the magnet are twisted through a right-angle near their ends and have a pole-piece 12a which is bent over into a plane parallel to the end face of the magnet projecting from their narrower side. Such a magnet arrangement carrying coils 11, Fig. 3, is attached by means of a non- magnetic clip, which serves also to secure the pole shoes to the magnet, to a ring 2 resting on a flange 1a of the casing 1. Terminal blocks 7 having metal inserts 9 bored for the reception of plugs are located in slots 8 in the casing and the coil ends are soldered to the closed ends of the inserts. A disc of insulating material 3 seated on a recess in the ring 2 has slots through which the pole pieces 12a may project and a hole covered with a woven material which serves in conjunction with a mesh covered eyeletted aperture 17 to equalize the air pressures on each side of the diaphragm 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB276853A GB738029A (en) | 1953-01-30 | 1953-01-30 | Improvements relating to electromagnetic telephone instruments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB276853A GB738029A (en) | 1953-01-30 | 1953-01-30 | Improvements relating to electromagnetic telephone instruments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB738029A true GB738029A (en) | 1955-10-05 |
Family
ID=9745535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB276853A Expired GB738029A (en) | 1953-01-30 | 1953-01-30 | Improvements relating to electromagnetic telephone instruments |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB738029A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2958739A (en) * | 1954-08-13 | 1960-11-01 | Schalltechnik Dr Ing K Schoeps | Electroacoustic transducer |
-
1953
- 1953-01-30 GB GB276853A patent/GB738029A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2958739A (en) * | 1954-08-13 | 1960-11-01 | Schalltechnik Dr Ing K Schoeps | Electroacoustic transducer |
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