GB400629A - Improvements in or relating to condenser microphones - Google Patents
Improvements in or relating to condenser microphonesInfo
- Publication number
- GB400629A GB400629A GB1215632A GB1215632A GB400629A GB 400629 A GB400629 A GB 400629A GB 1215632 A GB1215632 A GB 1215632A GB 1215632 A GB1215632 A GB 1215632A GB 400629 A GB400629 A GB 400629A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diaphragm
- casing
- pins
- shield
- air space
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
400,629. Microphones. TELEPHONE MANUFACTURING CO., Ltd. and BURRIDGE, B. J., Martell Road, West Dulwich, London. April 27, 1932, No. 12156. [Class 40 (iv).] A condenser microphone comprising in combination a casing and fixed and movable electrodes, one of which is the diaphragm, is characterized in that the diaphragm is substantially untensioned, and the air space enclosed behind it is such that the pressure therein is not appreciably modified by movements of the diaphragm in normal operation. Preferably, the fixed electrode has a surrounding air space or spaces between it and the casing and there is no "breather hole" in the casing. In the construction shown, the fixed electrode consists of a large number of pins 16 extending from a plate 17, which is mounted on an insulating block 14 provided in a casing 10. The outer ends of the pins may all lie in a plane parallel to that of the diaphragm 20, which in the device shown is a flat sheet of gold foil. The diaphragm is clamped between a ring 21 and the upper end of the casing, which is formed with a lip 24 that serves to stretch the diaphragm slightly, but only sufficiently to prevent excessive slackness. The gap between the diaphragm and the back electrode is comparatively large, e.g. from À01 to À008 of an inch. The thickness of the diaphragm is preferably 2À5 X 10<-6> inches, and its "effective weight" is less than the estimated pressure produced by sound waves in normal use. A shield 25 may be provided to protect the diaphragm and also to serve as a sound filter which may be used to modify the frequency response. The shield may consist of two layers of wire gauze with an intermediate layer of cotton-wool. The diaphragm may be of conical form, and the back electrode may comprise a number of strips instead of pins.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1215632A GB400629A (en) | 1932-04-27 | 1932-04-27 | Improvements in or relating to condenser microphones |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1215632A GB400629A (en) | 1932-04-27 | 1932-04-27 | Improvements in or relating to condenser microphones |
Publications (1)
Publication Number | Publication Date |
---|---|
GB400629A true GB400629A (en) | 1933-10-27 |
Family
ID=9999358
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1215632A Expired GB400629A (en) | 1932-04-27 | 1932-04-27 | Improvements in or relating to condenser microphones |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB400629A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2157916A (en) * | 1984-04-10 | 1985-10-30 | Microtel Bv | An electric transducer and a method for manufacturing a transducer assembly |
GB2324222A (en) * | 1997-04-11 | 1998-10-14 | Sennheiser Electronic | Sweat-proof capacitor microphone |
EP1915028A2 (en) * | 2006-10-16 | 2008-04-23 | Japan Precision Instruments Inc. | Condenser microphone, microphone unit, and blood pressure gauge |
-
1932
- 1932-04-27 GB GB1215632A patent/GB400629A/en not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2157916A (en) * | 1984-04-10 | 1985-10-30 | Microtel Bv | An electric transducer and a method for manufacturing a transducer assembly |
GB2324222A (en) * | 1997-04-11 | 1998-10-14 | Sennheiser Electronic | Sweat-proof capacitor microphone |
US6111966A (en) * | 1997-04-11 | 2000-08-29 | Staat; Raimund | Capacitor microphone |
GB2324222B (en) * | 1997-04-11 | 2001-10-17 | Sennheiser Electronic | A capacitor microphone |
EP1915028A2 (en) * | 2006-10-16 | 2008-04-23 | Japan Precision Instruments Inc. | Condenser microphone, microphone unit, and blood pressure gauge |
EP1915028A3 (en) * | 2006-10-16 | 2011-01-26 | Japan Precision Instruments Inc. | Condenser microphone, microphone unit, and blood pressure gauge |
US8483399B2 (en) | 2006-10-16 | 2013-07-09 | Japan Precision Instruments Inc. | Condenser microphone, microphone unit, and blood pressure gauge |
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