GB218743A - Improvements in telephone receivers, loud speaking telephones, and the like sound emitting devices - Google Patents
Improvements in telephone receivers, loud speaking telephones, and the like sound emitting devicesInfo
- Publication number
- GB218743A GB218743A GB988523A GB988523A GB218743A GB 218743 A GB218743 A GB 218743A GB 988523 A GB988523 A GB 988523A GB 988523 A GB988523 A GB 988523A GB 218743 A GB218743 A GB 218743A
- Authority
- GB
- United Kingdom
- Prior art keywords
- casing
- vessel
- hemispherical
- permanent magnet
- secured
- 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
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
218,743. British Thomson-Houston Co., Ltd., and Young, A. P. April 11. 1923. Magnetic instruments.-A sound transmitter or emitter, such as a telephone receiver, comprises a hemispherical vessel of magnetic material 11 with a permanent bar magnet 12 located axially therein and a vibratory member of magnetic material mounted with its edge adjacent to the edge of the vessel. The coil 16 may be mounted around a portion of the permanent magnet, which may be reduced in section and may be of round or square cross-section. The vessel may form the external casing of the instrument, and may be bronzed or lacquered. The vibratory member may be a diaphragm 13, Fig. 1, or may be mounted upon a sounding board of wood, cellulose acetate, mica, paper or other materials. Two vessels 11, Fig. 2, may be secured together with overlapping flanges and made sufficiently resilient at their rims to act as vibratory members. A permanent magnet 12 may be secured centrally of each vessel with an air gap between the adjacent poles, and an operating coil 16 may be mounted on brackets, or may be split in two with portions on the free ends of the magnets connected by a resilient conductor. A single magnet may be carried axially of the casing on brackets, and a coil mounted on each end adjacent the interiors of the two hemispherical vessels. The hemispherical vessel may be hung, Fig. 1, so that the diaphragm is horizontal. According to the Provisional Specification, the permanent magnet may be secured in the casing by means of a screw or by moulding it in position with the aid of an insulating material such as synthetic resin, and the casing may be coated with moulded insulating material or mounted in a casing made of such material. A straight bar permanent magnet may be mounted between two vibratory iron diaphragms which may form the ends of an iron cylinder, or two bar magnets may be used secured at their outer ends to the casing. A single hemispherical bowl may be suspended with the diaphragm above or below the bowl. Specifications 1912/98 and 600/12 are referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB988523A GB218743A (en) | 1923-04-11 | 1923-04-11 | Improvements in telephone receivers, loud speaking telephones, and the like sound emitting devices |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB988523A GB218743A (en) | 1923-04-11 | 1923-04-11 | Improvements in telephone receivers, loud speaking telephones, and the like sound emitting devices |
Publications (1)
Publication Number | Publication Date |
---|---|
GB218743A true GB218743A (en) | 1924-07-11 |
Family
ID=9880593
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB988523A Expired GB218743A (en) | 1923-04-11 | 1923-04-11 | Improvements in telephone receivers, loud speaking telephones, and the like sound emitting devices |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB218743A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4473721A (en) * | 1981-04-01 | 1984-09-25 | Siegfried Klein | High-frequency loud speaker |
US6481755B2 (en) | 1996-03-04 | 2002-11-19 | Georg Fischer Waga N.V. | Coupling device and method for fabricating a grip ring to be used in such a coupling device |
-
1923
- 1923-04-11 GB GB988523A patent/GB218743A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4473721A (en) * | 1981-04-01 | 1984-09-25 | Siegfried Klein | High-frequency loud speaker |
US6481755B2 (en) | 1996-03-04 | 2002-11-19 | Georg Fischer Waga N.V. | Coupling device and method for fabricating a grip ring to be used in such a coupling device |
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