GB791295A - Improvements in or relating to electro-magnetic telephones - Google Patents
Improvements in or relating to electro-magnetic telephonesInfo
- Publication number
- GB791295A GB791295A GB21008/55A GB2100855A GB791295A GB 791295 A GB791295 A GB 791295A GB 21008/55 A GB21008/55 A GB 21008/55A GB 2100855 A GB2100855 A GB 2100855A GB 791295 A GB791295 A GB 791295A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cover
- diaphragm
- magnetic
- electro
- relating
- 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
- H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
791,295. Microphones and receivers. PHILIPS ELECTRICAL INDUSTRIES, Ltd. July 20, 1955 [July 23, 1954], No. 21008/55. Class 40 (4). In an electromagnetic telephone instrument in which a magnetic diaphragm 2 is associated with wound pole pieces 5, 6 of a magnet 4, the pole pieces project through apertures in a cover 8 which are sealed by a foil disc 9 of non- magnetic material such as aluminium or acetobutyrate. This disc is positioned between the diaphragm and the cover, and restsrict the acoustic path between the rear of the diaphragm and a closed chamber 1 to an opening 3 in the foil and cover which is filled with an acoustic resistance material.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL331379X | 1954-07-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB791295A true GB791295A (en) | 1958-02-26 |
Family
ID=19784383
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB21008/55A Expired GB791295A (en) | 1954-07-23 | 1955-07-20 | Improvements in or relating to electro-magnetic telephones |
Country Status (5)
Country | Link |
---|---|
US (1) | US2852627A (en) |
BE (1) | BE540009A (en) |
CH (1) | CH331379A (en) |
GB (1) | GB791295A (en) |
NL (1) | NL85836C (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3179749A (en) * | 1960-03-03 | 1965-04-20 | Milton L Snow | Telephone instrument controlling device |
NL274625A (en) * | 1961-02-10 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1644788A (en) * | 1922-12-08 | 1927-10-11 | Western Electric Co | Acoustic device |
US2249161A (en) * | 1939-05-19 | 1941-07-15 | Bell Telephone Labor Inc | Electroacoustic device |
-
0
- BE BE540009D patent/BE540009A/xx unknown
- NL NL85836D patent/NL85836C/xx active
-
1955
- 1955-07-08 US US520886A patent/US2852627A/en not_active Expired - Lifetime
- 1955-07-20 GB GB21008/55A patent/GB791295A/en not_active Expired
- 1955-07-21 CH CH331379D patent/CH331379A/en unknown
Also Published As
Publication number | Publication date |
---|---|
NL85836C (en) | |
CH331379A (en) | 1958-07-15 |
US2852627A (en) | 1958-09-16 |
BE540009A (en) |
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