GB190710440A - Improvements in Microphones for Telephones. - Google Patents
Improvements in Microphones for Telephones.Info
- Publication number
- GB190710440A GB190710440A GB190710440DA GB190710440A GB 190710440 A GB190710440 A GB 190710440A GB 190710440D A GB190710440D A GB 190710440DA GB 190710440 A GB190710440 A GB 190710440A
- Authority
- GB
- United Kingdom
- Prior art keywords
- constructed
- microphones
- current
- granular carbon
- electrodes
- 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
Landscapes
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
10,440. Browne, R. C. May 4. Telephones.-Microphones are so constructed that the current flows at right-angles to the direction of the pressure produced by the sound waves. A thin layer of granular carbon 26, Fig. 3, is retained between non-conducting walls 18, 19 supported by the insulating-frames 15, 16, 17. The retaining walls 18, 19 are constructed of mica and silk cemented together, and are respectively secured to the main diaphragm 13 and to the support 14. The electrodes 23, of platinum, gold, aluminium, &c., are preferably of thin metal, and project into the layer of granular carbon, being formed with current-focusing portions c so that the current is most dense in that portion of the granular carbon which is most greatly compressed. In a modified construction, three electrodes are employed. The thin layer of carbon 26 may be made of considerable length and breadth, so that very high resistance microphones may be constructed in this way.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB190710440T | 1907-05-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB190710440A true GB190710440A (en) | 1908-03-12 |
Family
ID=32206377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB190710440D Expired GB190710440A (en) | 1907-05-04 | 1907-05-04 | Improvements in Microphones for Telephones. |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB190710440A (en) |
-
1907
- 1907-05-04 GB GB190710440D patent/GB190710440A/en not_active Expired
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