GB481351A - Improvements in or relating to telephone receivers - Google Patents
Improvements in or relating to telephone receiversInfo
- Publication number
- GB481351A GB481351A GB16280/37A GB1628037A GB481351A GB 481351 A GB481351 A GB 481351A GB 16280/37 A GB16280/37 A GB 16280/37A GB 1628037 A GB1628037 A GB 1628037A GB 481351 A GB481351 A GB 481351A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relating
- proportions
- iron
- telephone receivers
- cobalt
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 4
- 229910000531 Co alloy Inorganic materials 0.000 abstract 1
- 229910000640 Fe alloy Inorganic materials 0.000 abstract 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 abstract 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 abstract 1
- 229910000756 V alloy Inorganic materials 0.000 abstract 1
- 229910017052 cobalt Inorganic materials 0.000 abstract 1
- 239000010941 cobalt Substances 0.000 abstract 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 abstract 1
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 229910052750 molybdenum Inorganic materials 0.000 abstract 1
- 239000011733 molybdenum Substances 0.000 abstract 1
- 239000010959 steel Substances 0.000 abstract 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/225—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for telephonic receivers
Abstract
In a telephone instrument of the magnetic diaphragm type, the polepieces are preferably formed of nickel-iron alloy in the proportions 45 : 55 and the diaphragm is made of an alloy of cobalt, iron, and vanadium in the proportions 49 : 49 : 2. The steel for the permanent magnet is composed of iron, cobalt, and molybdenum in the proportions 72 : 12 : 16. p
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US215787XA | 1936-08-01 | 1936-08-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB481351A true GB481351A (en) | 1938-03-09 |
Family
ID=21805020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB16280/37A Expired GB481351A (en) | 1936-08-01 | 1937-06-11 | Improvements in or relating to telephone receivers |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE422587A (en) |
| CH (1) | CH215787A (en) |
| FR (1) | FR824971A (en) |
| GB (1) | GB481351A (en) |
Cited By (4)
| 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 |
| DE947083C (en) * | 1952-10-01 | 1956-08-09 | Standard Elek K Ag | Electromagnetic sound device in capsule form |
| EP0204386A1 (en) * | 1985-06-07 | 1986-12-10 | Koninklijke Philips Electronics N.V. | Electrodynamic transducer comprising a two-part diaphragm |
| EP0262729A1 (en) * | 1986-09-29 | 1988-04-06 | Koninklijke Philips Electronics N.V. | Loudspeaker having a two-part diaphragm for use as a car loudspeaker |
-
0
- BE BE422587D patent/BE422587A/xx unknown
-
1937
- 1937-06-11 GB GB16280/37A patent/GB481351A/en not_active Expired
- 1937-07-29 CH CH215787D patent/CH215787A/en unknown
- 1937-07-30 FR FR824971D patent/FR824971A/en not_active Expired
Cited By (4)
| 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 |
| DE947083C (en) * | 1952-10-01 | 1956-08-09 | Standard Elek K Ag | Electromagnetic sound device in capsule form |
| EP0204386A1 (en) * | 1985-06-07 | 1986-12-10 | Koninklijke Philips Electronics N.V. | Electrodynamic transducer comprising a two-part diaphragm |
| EP0262729A1 (en) * | 1986-09-29 | 1988-04-06 | Koninklijke Philips Electronics N.V. | Loudspeaker having a two-part diaphragm for use as a car loudspeaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CH215787A (en) | 1941-07-15 |
| BE422587A (en) | |
| FR824971A (en) | 1938-02-21 |
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