GB210212A - Improvements in telephone receivers - Google Patents
Improvements in telephone receiversInfo
- Publication number
- GB210212A GB210212A GB3166722A GB3166722A GB210212A GB 210212 A GB210212 A GB 210212A GB 3166722 A GB3166722 A GB 3166722A GB 3166722 A GB3166722 A GB 3166722A GB 210212 A GB210212 A GB 210212A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screw
- diaphragm
- pole piece
- tipped
- magnet
- 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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/16—Mounting or tensioning of diaphragms or cones
- H04R7/24—Tensioning by means acting directly on free portions of diaphragm or cone
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
210,212. Brown, A. C. Nov. 20, 1922. Magnetic instruments.-The pole piece c in a telephone receiver is ground to a level with the diaphragm seating, so that the diaphragm originally rests upon it: the diaphragm being then raised slightly by a screw s, which is preferably formed of or tipped with hard elastic material such as ivorv, agate, glass or metal. The screw s may pass through a lug l in the case, which is split so as to form a spring grip to retain the screw s in position; or it may pass through the pole piece c. The screw s is formed with a shoulder to prevent the diaphragm being raised so far as to damage it. The permanent magnet m is preferably a bar magnet with its similarly-polarized ends turned up, as shown in Fig. 2, and ground flush with the pole piece and diaphragm seating. Or the magnet may be formed of a straight piece with separate pole pieces at each end ground flush in the same way. According to the Provisional Specification, the screw s may be tipped with wood or ebonite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3166722A GB210212A (en) | 1922-11-20 | 1922-11-20 | Improvements in telephone receivers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3166722A GB210212A (en) | 1922-11-20 | 1922-11-20 | Improvements in telephone receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB210212A true GB210212A (en) | 1924-01-31 |
Family
ID=10326579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3166722A Expired GB210212A (en) | 1922-11-20 | 1922-11-20 | Improvements in telephone receivers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB210212A (en) |
-
1922
- 1922-11-20 GB GB3166722A patent/GB210212A/en not_active Expired
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