GB1409789A - Magnet assembly - Google Patents
Magnet assemblyInfo
- Publication number
- GB1409789A GB1409789A GB5977972A GB5977972A GB1409789A GB 1409789 A GB1409789 A GB 1409789A GB 5977972 A GB5977972 A GB 5977972A GB 5977972 A GB5977972 A GB 5977972A GB 1409789 A GB1409789 A GB 1409789A
- Authority
- GB
- United Kingdom
- Prior art keywords
- permanent magnet
- magnets
- loudspeakers
- iron
- return path
- 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
- H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
- H04R2209/022—Aspects regarding the stray flux internal or external to the magnetic circuit, e.g. shielding, shape of magnetic circuit, flux compensation coils
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
1409789 Loudspeakers GENERAL ELECTRIC CO 28 Dec 1972 [21 Jan 1972] 59779/72 Heading H4J A permanent magnet assembly for a loudspeaker comprises a radially magnetized ring- shaped permanent magnet 8 (Fig. 2) and a return path element 7 having two concentric ring- shaped members 9, 10 defining between them an opening at one end into which fits the permanent magnet 8. The other end of the return path element 7 has at least one small bridge, preferably three bridges 17, 18, 19 (Fig. 3) connecting members 9 and 10. At the open end the member 10 is of thickness greater than the remainder of the member 10. At the open end a polepiece 21 forms an air gap with member 10, the other end being in contact with member 10. A voice coil 4 wound on a form is coupled to a diaphragm (2), Fig. 1 (not shown). The permanent magnet may be of barium or strontium ferrite, cobalt-rare earth magnets of the Co5Sm type, " Alnico ", fine particle elongate of single domain magnets, or iron or iron-cobalt alloys. Loudspeakers of different characteristics may be obtained by using permanent magnets of different lengths.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US21971872A | 1972-01-21 | 1972-01-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1409789A true GB1409789A (en) | 1975-10-15 |
Family
ID=22820492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5977972A Expired GB1409789A (en) | 1972-01-21 | 1972-12-28 | Magnet assembly |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US3763334A (en) |
| JP (1) | JPS4883817A (en) |
| BE (1) | BE794025A (en) |
| DE (1) | DE2302385A1 (en) |
| ES (1) | ES410589A1 (en) |
| FR (1) | FR2168575B1 (en) |
| GB (1) | GB1409789A (en) |
| IT (1) | IT978181B (en) |
| NL (1) | NL7217774A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4451811A (en) * | 1979-07-30 | 1984-05-29 | Litton Systems, Inc. | Magnet structure |
| US4645960A (en) * | 1979-07-30 | 1987-02-24 | Litton Systems, Inc. | Ferro-fluid bearing |
| WO1990014169A1 (en) * | 1989-05-16 | 1990-11-29 | Infrawave Technology A.S | Electromechanical transducer for low frequency vibrations |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4878560A (en) * | 1989-03-16 | 1989-11-07 | Scott Robert T | Earmold |
| US5464079A (en) * | 1991-03-13 | 1995-11-07 | Alfred Teves Gmbh | Two-tube shock absorber |
| DE69430776T2 (en) * | 1993-04-28 | 2003-03-27 | Matsushita Electric Ind Co Ltd | Speaker apparatus |
| DE29512102U1 (en) * | 1995-07-27 | 1995-10-05 | Nokia (Deutschland) Gmbh, 75175 Pforzheim | Magnet system |
| DE19616794B4 (en) * | 1996-04-26 | 2005-09-29 | Harman Audio Electronic Systems Gmbh | speaker |
| DE10215364B4 (en) * | 2002-04-08 | 2004-05-27 | Harman/Becker Automotive Systems Gmbh (Straubing Division) | Drive arrangement for a loudspeaker |
| DE10232643A1 (en) * | 2002-07-18 | 2004-02-12 | Harman/Becker Automotive Systems Gmbh (Straubing Division) | Actuating structure for a loudspeaker has an arrangement of magnets with an actuating magnet, a pole core and a pole shank as well as an air gap |
| FR2960738B1 (en) * | 2010-05-28 | 2015-09-25 | Focal Jmlab | ACOUSTIC SPEAKER |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2293078A (en) * | 1939-12-05 | 1942-08-18 | B A Proctor Company Inc | Microphone |
| US2860721A (en) * | 1954-03-24 | 1958-11-18 | Fauthal A Hassan | Sound reproducing device |
| DE971442C (en) * | 1954-08-29 | 1959-01-29 | Standard Elek K Lorenz Ag | Dynamic speaker |
| USRE26030E (en) * | 1956-02-28 | 1966-05-24 | Dynamic transducer | |
| US3046362A (en) * | 1956-11-06 | 1962-07-24 | Stanley F White | Speaker |
| US2923783A (en) * | 1957-06-17 | 1960-02-02 | Stanley F White | Electro-acoustical transducer |
| US3413579A (en) * | 1966-03-14 | 1968-11-26 | Westinghouse Electric Corp | Magnetic field assembly for electro-mechanical transducers |
-
0
- BE BE794025D patent/BE794025A/en unknown
-
1972
- 1972-01-21 US US00219718A patent/US3763334A/en not_active Expired - Lifetime
- 1972-12-28 NL NL7217774A patent/NL7217774A/xx unknown
- 1972-12-28 GB GB5977972A patent/GB1409789A/en not_active Expired
-
1973
- 1973-01-13 ES ES410589A patent/ES410589A1/en not_active Expired
- 1973-01-16 IT IT19241/73A patent/IT978181B/en active
- 1973-01-18 DE DE2302385A patent/DE2302385A1/en active Pending
- 1973-01-19 FR FR7302001A patent/FR2168575B1/fr not_active Expired
- 1973-01-19 JP JP48008011A patent/JPS4883817A/ja active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4451811A (en) * | 1979-07-30 | 1984-05-29 | Litton Systems, Inc. | Magnet structure |
| US4645960A (en) * | 1979-07-30 | 1987-02-24 | Litton Systems, Inc. | Ferro-fluid bearing |
| WO1990014169A1 (en) * | 1989-05-16 | 1990-11-29 | Infrawave Technology A.S | Electromechanical transducer for low frequency vibrations |
Also Published As
| Publication number | Publication date |
|---|---|
| NL7217774A (en) | 1973-07-24 |
| US3763334A (en) | 1973-10-02 |
| FR2168575B1 (en) | 1977-02-04 |
| ES410589A1 (en) | 1975-12-16 |
| IT978181B (en) | 1974-09-20 |
| DE2302385A1 (en) | 1973-07-26 |
| JPS4883817A (en) | 1973-11-08 |
| FR2168575A1 (en) | 1973-08-31 |
| BE794025A (en) | 1973-05-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| CSNS | Application of which complete specification have been accepted and published, but patent is not sealed |