GB312950A - Improvements in loud speakers and the like - Google Patents
Improvements in loud speakers and the likeInfo
- Publication number
- GB312950A GB312950A GB316528A GB316528A GB312950A GB 312950 A GB312950 A GB 312950A GB 316528 A GB316528 A GB 316528A GB 316528 A GB316528 A GB 316528A GB 312950 A GB312950 A GB 312950A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cone
- coil
- suspended
- secured
- annular
- 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
- H04R9/02—Details
- H04R9/025—Magnetic circuit
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/002—Damping circuit arrangements for transducers, e.g. motional feedback circuits
-
- 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
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
- H04R9/046—Construction
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
312,950. Lucas, O. D. Feb. 1, 1928. Diaphragms; magnetic instruments. - The coil of a moving coil loud-speaker &c. extends into two annular magnetic air gaps in such a manner that in addition to these air gaps there is a further air gap or gaps separating the inner poles and/or outer poles at the centre of the coil. In the construction, Fig. 1, the coil a carried by a cylinder g moves coaxially over cores c, b of opposite polarity provided with energizing coils e, d and supported at their outer ends on a soft iron pot h provided with an inner extension h<1> which forms the outer member of the annular air gaps. The cylinder g is suspended on a disc or radial arms f carried by a rod i which is secured to a cone m and is suspended by loops j, k of silk &c. Alternatively, the arms f may extend through slots in the pot h and be secured to the cone m as shown in Fig 2. In this modification, the annular magnetic fields are formed between a common core c and annuli c<2>, the ends of the core being secured to discs c' which are connected to the annuli c<2> by rods c<3> on which are wound energizing coils c'. The magnet within the cone m is covered by an inverted cone m<1>. The single coils d, e or c<4> may be substituted by three or more connected in series or parallel. According to a further modification (Fig. 3, not shown) the coil a is divided into two portions connected in series and located in annular fields of opposite polarity formed by two pot magnets. The cone' m may be suspended at each end by loops similar to j, k, Fig. 1, the distance of the points of suspension from the axis of the cone being preferably equal to the diameter of the base of the cone. Instead of the central cores being of equal length with an energizing coil on each, the core remote from the cone may be made considerably longer than the other so as to carry a single coil.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB316528A GB312950A (en) | 1928-02-01 | 1928-02-01 | Improvements in loud speakers and the like |
GB1329629A GB312979A (en) | 1928-02-01 | 1928-02-01 | Improvements in loud speakers and the like |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB316528A GB312950A (en) | 1928-02-01 | 1928-02-01 | Improvements in loud speakers and the like |
Publications (1)
Publication Number | Publication Date |
---|---|
GB312950A true GB312950A (en) | 1929-06-04 |
Family
ID=9753147
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB316528A Expired GB312950A (en) | 1928-02-01 | 1928-02-01 | Improvements in loud speakers and the like |
GB1329629A Expired GB312979A (en) | 1928-02-01 | 1928-02-01 | Improvements in loud speakers and the like |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1329629A Expired GB312979A (en) | 1928-02-01 | 1928-02-01 | Improvements in loud speakers and the like |
Country Status (1)
Country | Link |
---|---|
GB (2) | GB312950A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2926221A (en) * | 1957-11-21 | 1960-02-23 | William A Kagdis | Loudspeaker construction |
US3055991A (en) * | 1955-11-30 | 1962-09-25 | Guss Reuben | Loudspeaker |
US3686446A (en) * | 1968-12-19 | 1972-08-22 | Manger J W | Push-pull moving coil loudspeaker having electromagnetic centering means |
US4379951A (en) * | 1977-04-20 | 1983-04-12 | Gabr Saad Z M | Electro-acoustic transducer means |
-
1928
- 1928-02-01 GB GB316528A patent/GB312950A/en not_active Expired
- 1928-02-01 GB GB1329629A patent/GB312979A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3055991A (en) * | 1955-11-30 | 1962-09-25 | Guss Reuben | Loudspeaker |
US2926221A (en) * | 1957-11-21 | 1960-02-23 | William A Kagdis | Loudspeaker construction |
US3686446A (en) * | 1968-12-19 | 1972-08-22 | Manger J W | Push-pull moving coil loudspeaker having electromagnetic centering means |
US4379951A (en) * | 1977-04-20 | 1983-04-12 | Gabr Saad Z M | Electro-acoustic transducer means |
Also Published As
Publication number | Publication date |
---|---|
GB312979A (en) | 1929-06-04 |
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