GB204023A - Improvements in and relating to loud-speaking apparatus - Google Patents
Improvements in and relating to loud-speaking apparatusInfo
- Publication number
- GB204023A GB204023A GB19500/23A GB1950023A GB204023A GB 204023 A GB204023 A GB 204023A GB 19500/23 A GB19500/23 A GB 19500/23A GB 1950023 A GB1950023 A GB 1950023A GB 204023 A GB204023 A GB 204023A
- Authority
- GB
- United Kingdom
- Prior art keywords
- armature
- magnets
- supported
- diaphragm
- flattened
- 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
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 1
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- 239000004411 aluminium Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 239000010445 mica Substances 0.000 abstract 1
- 229910052618 mica group Inorganic materials 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
- H04R11/00—Transducers of moving-armature or moving-core type
Abstract
204,023. British Thomson - Houston Co., Ltd., (Assignees of Hoxie, C. A.). Sept. 13, 1922, [Convention date]. Magnetic instruments.-In a sound-reproducing device, such as a telephone receiver, the diaphragm 21 is connected to a rigid member 12 supported at its ends and constructed so as to have no natural period of vibration within the range of audible frequencies. The member 12 may be a tube of aluminium, having an armature 14 placed over its middle portion and being flattened there so as to lie in the air gap between the poles of magnets 3, 4. The armature 14 is sufficiently thick to cause the member 12 to bend only in the end portions. The member 12 is supported in pillars 10 and may be adjusted by means of screws 16, 17. An actuating coil 18 surrounds the armature 14. The conical diaphragm 21 is formed with a flattened base 24 of flexible material such as mica so that the conical portion, which is connected rigidly to the armature 14 by a link 20, vibrates as a whole. The magnets 3, 4 are held on a bridging member 6 secured to a bracket 8 on the member 9.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US588088A US1752909A (en) | 1922-09-13 | 1922-09-13 | Loud-speaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB204023A true GB204023A (en) | 1924-07-31 |
Family
ID=24352439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB19500/23A Expired GB204023A (en) | 1922-09-13 | 1923-07-30 | Improvements in and relating to loud-speaking apparatus |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US1752909A (en) |
| FR (1) | FR572293A (en) |
| GB (1) | GB204023A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2951190A (en) * | 1954-10-28 | 1960-08-30 | Baermann Max | Electro-mechanical transformer |
-
1922
- 1922-09-13 US US588088A patent/US1752909A/en not_active Expired - Lifetime
-
1923
- 1923-07-30 GB GB19500/23A patent/GB204023A/en not_active Expired
- 1923-09-01 FR FR572293D patent/FR572293A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US1752909A (en) | 1930-04-01 |
| FR572293A (en) | 1924-06-03 |
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