GB528400A - Electro-acoustic devices - Google Patents
Electro-acoustic devicesInfo
- Publication number
- GB528400A GB528400A GB13521/39A GB1352139A GB528400A GB 528400 A GB528400 A GB 528400A GB 13521/39 A GB13521/39 A GB 13521/39A GB 1352139 A GB1352139 A GB 1352139A GB 528400 A GB528400 A GB 528400A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil
- ribbon
- pairs
- air gap
- corrugated transversely
- 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
- H04R9/08—Microphones
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
528,400. Telephone instruments. STANDARD TELEPHONES & CABLES, Ltd. May 5, 1939, No. 13521. Convention date, May 5, 1938. [Class 40 (iv)] A ribbon diaphragm for a telephone transmitter or receiver comprises a portion of a single-layer multi-turn coil of fine wire bound into a ribbon, and preferably corrugated transversely. The coil may be wound on a rectangular former, and impregnated with a binder such as a cellulose cement thinned with amyl acetate and containing aluminium powder as a filler. One long side of the coil is then corrugated transversely to form the ribbon 17 and the other side and ends of the coil are slit as shown in Fig. 3, the parts 18, 19 serving, after shaping, to support the coil in the gap. In a modification for a double air gap, the two sides of the coil form the ribbon diaphragm, and the ends serve as supports, Fig. 6 (not shown). In Fig. 1, the air gap is formed between polepieces 15, 16 sandwiched between two pairs of permanent magnets 10, 11, 12, 13 with their like poles together. In Fig. 4, the two gaps are formed between pole-pieces 34, 35, 36 arranged between four pairs of magnets 30,31,32,33.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US206162A US2233886A (en) | 1938-05-05 | 1938-05-05 | Acoustic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB528400A true GB528400A (en) | 1940-10-29 |
Family
ID=22765238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB13521/39A Expired GB528400A (en) | 1938-05-05 | 1939-05-05 | Electro-acoustic devices |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2233886A (en) |
| GB (1) | GB528400A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2552878A (en) * | 1947-09-24 | 1951-05-15 | Electro Voice | Second order differential microphone |
| US3142796A (en) * | 1953-08-18 | 1964-07-28 | Harold D Goldberg | Method and apparatus utilizing a conductor loop in a magnetic field for measuring areas and related quantities |
| US2963557A (en) * | 1954-06-01 | 1960-12-06 | Rca Corp | Magnetic structure |
| US4317966A (en) * | 1980-02-19 | 1982-03-02 | Lister Clive R B | Vibratory ribbon speaker |
| US4550228A (en) * | 1983-02-22 | 1985-10-29 | Apogee Acoustics, Inc. | Ribbon speaker system |
| US6868166B1 (en) * | 1998-06-10 | 2005-03-15 | Xiafu Zhang | Chord-like vibration loudspeaker |
| JP5253795B2 (en) * | 2007-11-29 | 2013-07-31 | 株式会社オーディオテクニカ | Ribbon microphone and ribbon microphone unit |
| US9197965B2 (en) | 2013-03-15 | 2015-11-24 | James J. Croft, III | Planar-magnetic transducer with improved electro-magnetic circuit |
-
1938
- 1938-05-05 US US206162A patent/US2233886A/en not_active Expired - Lifetime
-
1939
- 1939-05-05 GB GB13521/39A patent/GB528400A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2233886A (en) | 1941-03-04 |
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