GB369063A - Improvements in electro-acoustic devices - Google Patents
Improvements in electro-acoustic devicesInfo
- Publication number
- GB369063A GB369063A GB1418231A GB1418231A GB369063A GB 369063 A GB369063 A GB 369063A GB 1418231 A GB1418231 A GB 1418231A GB 1418231 A GB1418231 A GB 1418231A GB 369063 A GB369063 A GB 369063A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diaphragm
- surround
- shield
- damping
- microphone
- 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
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Headphones And Earphones (AREA)
Abstract
369,063. Sound reproducing and transmitting devices. BLUMLEIN, A. D., 57, Earl's Court Squars, and HOLMAN, H. E., 64A, The Chase, Clapham Common, both in London. May 13, 1931, No. 14182. [Class 40 (iv).] An electroacoustic device comprises a rigid piston-like diaphragm connected at its periphery to a flexible air-sealing surround, the resonant vibrations of the surround being damped. Preferably the surround is shielded and supports the diaphragm. As applied to a microphone the diaphragm a<1> is supported by an annulus c<1>, a shield m<1> lying close to the surround to provide air damping. A groove x<1> in the shield increases damping and a similar shield may be fitted at the rear of the diaphragm. Alternatively a packing of cotton wool or other damping material may rest lightly against the surround. To allow of variations of atmospheric pressure to be equalized on both sides of the diaphragm, capillary tunnels may be provided leading to the cavity behind the diaphragm. The main resonance of the diaphragm is damped electromagnetically as in Specifications 350,954 and 350,998. In other respects the microphone is identical with that described in Specification 350,998. The invention is also applicable to loud-speakers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1418231A GB369063A (en) | 1931-05-13 | 1931-05-13 | Improvements in electro-acoustic devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1418231A GB369063A (en) | 1931-05-13 | 1931-05-13 | Improvements in electro-acoustic devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB369063A true GB369063A (en) | 1932-03-17 |
Family
ID=10036488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1418231A Expired GB369063A (en) | 1931-05-13 | 1931-05-13 | Improvements in electro-acoustic devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB369063A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE854670C (en) * | 1948-10-02 | 1952-11-06 | Electroacustic Ges M B H | Damping device for telephones and microphones |
| CN106921920A (en) * | 2017-03-16 | 2017-07-04 | 浙江大学 | A kind of pistonphone of diaphragm seal |
-
1931
- 1931-05-13 GB GB1418231A patent/GB369063A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE854670C (en) * | 1948-10-02 | 1952-11-06 | Electroacustic Ges M B H | Damping device for telephones and microphones |
| CN106921920A (en) * | 2017-03-16 | 2017-07-04 | 浙江大学 | A kind of pistonphone of diaphragm seal |
| CN106921920B (en) * | 2017-03-16 | 2023-09-01 | 浙江大学 | Piston sounder sealed by film |
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