GB420390A - Microphone - Google Patents
MicrophoneInfo
- Publication number
- GB420390A GB420390A GB20193/33A GB2019333A GB420390A GB 420390 A GB420390 A GB 420390A GB 20193/33 A GB20193/33 A GB 20193/33A GB 2019333 A GB2019333 A GB 2019333A GB 420390 A GB420390 A GB 420390A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bores
- air
- membrane
- closed
- chamber
- 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
- H04R19/00—Electrostatic transducers
- H04R19/04—Microphones
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
420,390. Microphones. NEUMANN, G., 15, Michaelkirchstrasse, Berlin. July 17, 1933, No. 20193. Convention date, July 16, 1932. [Class 40 (iv)] In a microphone, more particularly a condenser microphone, having a thin, slightly stressed membrane, the restoring force of which is mainly determined by air cushions, the fixed electrode is provided both with closed bores of such a diameter and such a size that the air columns situated therein have a natural frequency above the audible range and also with bores which possess a greater volume than the first mentioned bores or are connected with separate air chambers and favour the lowest frequencies by resonance. The Figure shows a construction of condenser microphone in which a membrane 4 consisting of collodion film coated with beaten gold is pasted on the projecting edge 6 of the fixed electrode 5 in such a manner that the metal coating is not electrically connected with the edge 6. The electrode 5 is provided with closed bores 7 and also with a number of bores 7<1> which communicate with an annular chamber 10 closed by a cover 11, the sealing surface 12 of which is formed with a fine spiral groove which allows air to enter the chamber 10 along a long path but prevents all sound waves from passing to the interior of the chamber. The distances between the bores 7 may be varied and the bores 71 may be individually connected with an increased air space. An insulated contact pin 8 is connected with the membrane at 9.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE420390X | 1932-07-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB420390A true GB420390A (en) | 1934-11-30 |
Family
ID=6451375
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB20193/33A Expired GB420390A (en) | 1932-07-16 | 1933-07-17 | Microphone |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR749076A (en) |
GB (1) | GB420390A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2445821A (en) * | 1944-03-29 | 1948-07-27 | Noble E Brewer | Condenser microphone |
US3007012A (en) * | 1958-03-14 | 1961-10-31 | Rca Corp | Directional electrostatic microphone |
US3031538A (en) * | 1957-04-13 | 1962-04-24 | Gorike Rudolf | Small-size condenser microphone |
US4081626A (en) * | 1976-11-12 | 1978-03-28 | Polaroid Corporation | Electrostatic transducer having narrowed directional characteristic |
GB2142504A (en) * | 1983-06-28 | 1985-01-16 | Gibson Dawson Joseph | Microphone |
GB2456453B (en) * | 2006-10-18 | 2011-02-09 | Univ New York State Res Found | Miniature non-directional microphone |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE924325C (en) * | 1952-10-06 | 1955-02-28 | Nordwestdeutscher Rundfunk Ans | Condenser microphone |
-
1933
- 1933-01-14 FR FR749076D patent/FR749076A/en not_active Expired
- 1933-07-17 GB GB20193/33A patent/GB420390A/en not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2445821A (en) * | 1944-03-29 | 1948-07-27 | Noble E Brewer | Condenser microphone |
US3031538A (en) * | 1957-04-13 | 1962-04-24 | Gorike Rudolf | Small-size condenser microphone |
US3007012A (en) * | 1958-03-14 | 1961-10-31 | Rca Corp | Directional electrostatic microphone |
US4081626A (en) * | 1976-11-12 | 1978-03-28 | Polaroid Corporation | Electrostatic transducer having narrowed directional characteristic |
GB2142504A (en) * | 1983-06-28 | 1985-01-16 | Gibson Dawson Joseph | Microphone |
GB2456453B (en) * | 2006-10-18 | 2011-02-09 | Univ New York State Res Found | Miniature non-directional microphone |
Also Published As
Publication number | Publication date |
---|---|
FR749076A (en) | 1933-07-18 |
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