GB319942A - Improvements relating to loud speaker telephone instruments - Google Patents
Improvements relating to loud speaker telephone instrumentsInfo
- Publication number
- GB319942A GB319942A GB2919728A GB2919728A GB319942A GB 319942 A GB319942 A GB 319942A GB 2919728 A GB2919728 A GB 2919728A GB 2919728 A GB2919728 A GB 2919728A GB 319942 A GB319942 A GB 319942A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diaphragm
- attached
- coils
- pole plates
- supported
- 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
- 238000013016 damping Methods 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
- H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
319,942. Bernard, J. I. Oct. 10, 1928. Loud-speakers; magnetic instruments; diaphragms. - A soundreproducer of the moving-coil type has a diaphragm consisting of two or more re-entrant portions of conical shape to which are attached two or more driving coils located at different distances from the centre of the diaphragm. The diaphragm shown in Fig. 2, has re-entrant conical portions with coils k<1>, k<2>, and has an outer corrugated portion d attached to the baffle board l. The coils k<1>, k<2> may be wound on metallic spools to induce damping. The magnetic system consists of four electro or permanent magnets n<1> - - n<4>, Fig. 1, having pole plates p attached to the limbs q, the pole plates being supported on a framework r. The field coils m<5>, m<6>, Figs. 3, 4, may, be concentric with the diaphragm which may be supported by flexible arms e, attached at one end to the diaphragm, and at the other to the casing. The pole plates p have openings t to avoid closed air pockets. The Provisional Specification states that the diaphragm need not be of uniform thickness.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2919728A GB319942A (en) | 1928-10-10 | 1928-10-10 | Improvements relating to loud speaker telephone instruments |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2919728A GB319942A (en) | 1928-10-10 | 1928-10-10 | Improvements relating to loud speaker telephone instruments |
Publications (1)
Publication Number | Publication Date |
---|---|
GB319942A true GB319942A (en) | 1929-10-03 |
Family
ID=10287679
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2919728A Expired GB319942A (en) | 1928-10-10 | 1928-10-10 | Improvements relating to loud speaker telephone instruments |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB319942A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2789161A (en) * | 1951-04-05 | 1957-04-16 | Joseph B Brennan | Loud-speakers |
US7515723B2 (en) | 2000-12-26 | 2009-04-07 | Anders Sagren | Electro-acoustic converter with demountable diaphragm and voice coil assembly |
-
1928
- 1928-10-10 GB GB2919728A patent/GB319942A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2789161A (en) * | 1951-04-05 | 1957-04-16 | Joseph B Brennan | Loud-speakers |
US7515723B2 (en) | 2000-12-26 | 2009-04-07 | Anders Sagren | Electro-acoustic converter with demountable diaphragm and voice coil assembly |
US7551746B2 (en) | 2000-12-26 | 2009-06-23 | Anders Sagren | Drive unit for electro-acoustic converter with radially magnetized permanent magnetic bars |
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