GB784147A - Improvements in or relating to moving coil type sound reproducing devices - Google Patents
Improvements in or relating to moving coil type sound reproducing devicesInfo
- Publication number
- GB784147A GB784147A GB3230154A GB3230154A GB784147A GB 784147 A GB784147 A GB 784147A GB 3230154 A GB3230154 A GB 3230154A GB 3230154 A GB3230154 A GB 3230154A GB 784147 A GB784147 A GB 784147A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pole
- tip
- magnet
- gaps
- flux
- 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
- 230000004907 flux Effects 0.000 abstract 2
- 239000000696 magnetic material Substances 0.000 abstract 2
- 238000010079 rubber tapping Methods 0.000 abstract 2
- 101100298222 Caenorhabditis elegans pot-1 gene Proteins 0.000 abstract 1
- 230000001105 regulatory effect Effects 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
784,147. Loud-speakers. GOODMANS INDUSTRIES, Ltd. Nov. 8, 1955 [Nov. 8, 1954], No. 32301/54. Class 40 (4). Air gaps are provided at both ends of a central magnet structure for the operation of two moving coils, part of the flux for one of the air-gaps being by-passed by a tapping of magnetic material. The gap 10, Fig. 1, for a lowfrequency loudspeaker is defined by a pole-tip 4 and an annular pole-plate 5. The gap 8 for a high-frequency loud-speaker is defined by a subsidiary pole-tip 7 and the end of the pot 1. The proportions of flux across the two gaps may be adjusted by a regulated tapping of the magnet through a ring 19 of magnetic material. The rear of the high-frequency speaker is confined by a cover 16 so that the sound passes through passages 17 in the pole-tip 7 and through a horn-like passage in the magnet 3 and pole-tip 4. In Fig. 2 the pole-tip 7a is recessed into the magnet 3a. In Fig. 3 the pole-tips 4b, 7b abut so that the flux-paths across the air gaps are in parallel.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3230154A GB784147A (en) | 1954-11-08 | 1954-11-08 | Improvements in or relating to moving coil type sound reproducing devices |
| DEG18336A DE1040605B (en) | 1954-11-08 | 1955-11-08 | Sound playback device, in particular dynamic loudspeakers or the like. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3230154A GB784147A (en) | 1954-11-08 | 1954-11-08 | Improvements in or relating to moving coil type sound reproducing devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB784147A true GB784147A (en) | 1957-10-02 |
Family
ID=10336474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3230154A Expired GB784147A (en) | 1954-11-08 | 1954-11-08 | Improvements in or relating to moving coil type sound reproducing devices |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1040605B (en) |
| GB (1) | GB784147A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4143738A (en) * | 1977-01-29 | 1979-03-13 | Pioneer Electronic Corporation | Loudspeaker driver unit |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE317779C (en) * | ||||
| DE301391C (en) * | 1916-03-01 | |||
| AT127285B (en) * | 1929-09-28 | 1932-03-10 | Electrical Res Prod Inc | Electro-acoustic conversion devices such as speakers and the like. like |
| GB445935A (en) * | 1934-10-17 | 1936-04-17 | Alfred Sidney Evans | An improved sound reproducing device |
| GB452420A (en) * | 1935-02-15 | 1936-08-17 | Alfred Harold Whiteley | Improvements in and relating to electroacoustic apparatus |
| CH248118A (en) * | 1945-12-21 | 1947-04-15 | Schweiz Eidgenossenschaft Post | Electromagnetic handset. |
| GB696852A (en) * | 1951-05-30 | 1953-09-09 | Goodmans Ind Ltd | Improvements in or relating to loudspeakers and the like |
-
1954
- 1954-11-08 GB GB3230154A patent/GB784147A/en not_active Expired
-
1955
- 1955-11-08 DE DEG18336A patent/DE1040605B/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4143738A (en) * | 1977-01-29 | 1979-03-13 | Pioneer Electronic Corporation | Loudspeaker driver unit |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1040605B (en) | 1958-10-09 |
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