GB1386358A - Magnet system for an electro-acoustic electrodynamic transducer - Google Patents
Magnet system for an electro-acoustic electrodynamic transducerInfo
- Publication number
- GB1386358A GB1386358A GB3494072A GB3494072A GB1386358A GB 1386358 A GB1386358 A GB 1386358A GB 3494072 A GB3494072 A GB 3494072A GB 3494072 A GB3494072 A GB 3494072A GB 1386358 A GB1386358 A GB 1386358A
- Authority
- GB
- United Kingdom
- Prior art keywords
- upper plate
- core
- moving coil
- projections
- july
- 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
- 230000005520 electrodynamics Effects 0.000 title 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 4
- 229910052742 iron Inorganic materials 0.000 abstract 2
- 229910010293 ceramic material Inorganic materials 0.000 abstract 1
- 229920006395 saturated elastomer Polymers 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
- 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
Abstract
1386358 Moving coil transducers PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 26 July 1972 [29 July 1971] 34940/72 Heading H4J In a moving coil transducer such as a microphone the air gap is defined between a core 4 (Fig. 1) and an upper plate 2 by centering means integral with the upper plate 2. The centering means comprises three re-entrant projections 8 spaced 120 degrees apart and having ends 9 sufficiently low to permit movement of the moving coil. The inner walls 10 are accurately sized. Core 4 is integral with a lower plate 3 of soft iron. Upper plate 5 is of sintered iron and annular magnet 1 is oxidic ceramic material. An alternative transducer (Fig. 4) as a permanent magnet core 11. An upper plate 12 has three re-entrant projections 18 joined to a disc 14 which forms a pole piece for the magnet. The ends 9 (Fig. 1) and projections 18 (Fig. 4) have portions of reduced cross-section and these portions are magnetically saturated so as to present a high reluctance and, in consequence, low magnetic leakage.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7110445A NL7110445A (en) | 1971-07-29 | 1971-07-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1386358A true GB1386358A (en) | 1975-03-05 |
Family
ID=19813706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3494072A Expired GB1386358A (en) | 1971-07-29 | 1972-07-26 | Magnet system for an electro-acoustic electrodynamic transducer |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3891809A (en) |
| AT (1) | AT316668B (en) |
| DE (1) | DE2233656C3 (en) |
| FR (1) | FR2147288B1 (en) |
| GB (1) | GB1386358A (en) |
| IT (1) | IT963399B (en) |
| NL (1) | NL7110445A (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1957765A (en) * | 1934-05-08 | Magnetomotive force circuits | ||
| US2048222A (en) * | 1931-10-08 | 1936-07-21 | Deutsche Edelstahlwerke Ag | Improvements, in or relating to magnets |
| US2216961A (en) * | 1937-09-30 | 1940-10-08 | Rca Corp | Sound translating apparatus |
| US3462559A (en) * | 1964-08-03 | 1969-08-19 | Dallas Richard Wilder | Two-piece loudspeaker |
-
1971
- 1971-07-29 NL NL7110445A patent/NL7110445A/xx unknown
-
1972
- 1972-07-08 DE DE2233656A patent/DE2233656C3/en not_active Expired
- 1972-07-19 US US273299A patent/US3891809A/en not_active Expired - Lifetime
- 1972-07-26 GB GB3494072A patent/GB1386358A/en not_active Expired
- 1972-07-26 IT IT27463/72A patent/IT963399B/en active
- 1972-07-27 AT AT647972A patent/AT316668B/en not_active IP Right Cessation
- 1972-07-28 FR FR7227229A patent/FR2147288B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| AT316668B (en) | 1974-07-25 |
| FR2147288A1 (en) | 1973-03-09 |
| FR2147288B1 (en) | 1980-03-14 |
| US3891809A (en) | 1975-06-24 |
| IT963399B (en) | 1974-01-10 |
| DE2233656B2 (en) | 1979-04-05 |
| DE2233656C3 (en) | 1979-12-06 |
| DE2233656A1 (en) | 1973-02-08 |
| NL7110445A (en) | 1973-01-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3067366A (en) | Magnet system having little stray | |
| GB543716A (en) | Improvements in magnetic structures employing permanent magnets | |
| GB1460744A (en) | Loud speakers of the moving coil type | |
| GB1409789A (en) | Magnet assembly | |
| GB1493276A (en) | Magnetrons | |
| GB1408685A (en) | Electromagnets | |
| GB1159081A (en) | A Magnetic System for a Moving-Coil Transducer. | |
| GB1386358A (en) | Magnet system for an electro-acoustic electrodynamic transducer | |
| GB672467A (en) | Improvements in and relating to sound reproducing devices | |
| GB1535938A (en) | Electromagnetic transducers | |
| JPS57187914A (en) | Formation of bipolar radial anisotropic magnet | |
| GB1022850A (en) | Electro-acoustic transducer | |
| JPS579197A (en) | Speaker | |
| GB643465A (en) | Improvements relating to loudspeakers | |
| JPS5728497A (en) | Magnetic circuit for speaker | |
| JPS5225602A (en) | Dynamic pickup | |
| GB1336481A (en) | Method of magnetizing a permanent magnet assembly and a per manent magnet assembly when prepared by the method | |
| JPS59106296U (en) | Amplitude type electromagnetic acoustic transducer | |
| JPS56168499A (en) | Structure of electomagnetic sound generator | |
| GB1037244A (en) | Improvements in or relating to moving coil transducers | |
| JPS5723396A (en) | Field system device | |
| GB858977A (en) | Improvements in or relating to magnetic structures including a permanent magnet | |
| GB893838A (en) | Improvements relating to loudspeakers | |
| GB646180A (en) | Improvements in electrodynamic recording devices | |
| ES256749A1 (en) | Improvements in or relating to magnet systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |