GB438672A - Improvements in or relating to electrostatic devices for the interconversion of electrical vibrations and compressional vibrations in a fluid medium - Google Patents
Improvements in or relating to electrostatic devices for the interconversion of electrical vibrations and compressional vibrations in a fluid mediumInfo
- Publication number
- GB438672A GB438672A GB2169134A GB2169134A GB438672A GB 438672 A GB438672 A GB 438672A GB 2169134 A GB2169134 A GB 2169134A GB 2169134 A GB2169134 A GB 2169134A GB 438672 A GB438672 A GB 438672A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electret
- casing
- vibrations
- disc
- grid
- 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
- 239000012530 fluid Substances 0.000 title abstract 2
- 239000004411 aluminium Substances 0.000 abstract 1
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 230000005686 electrostatic field Effects 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/01—Electrostatic transducers characterised by the use of electrets
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
438,672. Receivers, transmitters, &c. GEMANT, A., 4b, Staverton Road, Oxford. July 24, 1934, No. 21691. [Class 40 (iv)] In an electrostatic instrument for the conversion of acoustic or other compressional vibrations in a fluid medium into electrical vibrations or vice versa, the electrostatic field is constituted by the surface field of one or more electrets. As shown, an electret disc 1 is clamped with its negatively-charged face against the wall 2 of a welded metallic casing 2, 3. This face of the electret disc 2 is metallized to ensure a good contact. An aluminium diaphragm 4 is secured in the casing opposite the positivelycharged face of the electret and a metal grid 5 or a perforated disc, insulated from the casing, is interposed between the electret and the diaphragm. The grid or disc 5 may be formed by metallizing the surface of the electret. The grid and the casing are connected in an external circuit, and movement of the diaphragm varies the ratio of the capacities between electret and grid, and between electret and casing, and so varies the current in the circuit. The casing is hermetically sealed and the interior dried.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2169134A GB438672A (en) | 1934-07-24 | 1934-07-24 | Improvements in or relating to electrostatic devices for the interconversion of electrical vibrations and compressional vibrations in a fluid medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2169134A GB438672A (en) | 1934-07-24 | 1934-07-24 | Improvements in or relating to electrostatic devices for the interconversion of electrical vibrations and compressional vibrations in a fluid medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB438672A true GB438672A (en) | 1935-11-21 |
Family
ID=10167219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2169134A Expired GB438672A (en) | 1934-07-24 | 1934-07-24 | Improvements in or relating to electrostatic devices for the interconversion of electrical vibrations and compressional vibrations in a fluid medium |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB438672A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2659022A (en) * | 1951-05-22 | 1953-11-10 | Tele King Corp | Electrostatic deflection system |
| US3108162A (en) * | 1960-04-11 | 1963-10-22 | Schindler Mark | Capacitor acousto-electric transducer and method of making the same |
| DE1247401B (en) * | 1964-10-24 | 1967-08-17 | Tesla Np | Electret microphone and its assembly method |
-
1934
- 1934-07-24 GB GB2169134A patent/GB438672A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2659022A (en) * | 1951-05-22 | 1953-11-10 | Tele King Corp | Electrostatic deflection system |
| US3108162A (en) * | 1960-04-11 | 1963-10-22 | Schindler Mark | Capacitor acousto-electric transducer and method of making the same |
| DE1247401B (en) * | 1964-10-24 | 1967-08-17 | Tesla Np | Electret microphone and its assembly method |
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