GB1409789A - Magnet assembly - Google Patents

Magnet assembly

Info

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
Application number
GB5977972A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Publication of GB1409789A publication Critical patent/GB1409789A/en
Expired legal-status Critical Current

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.
GB5977972A 1972-01-21 1972-12-28 Magnet assembly Expired GB1409789A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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 Industrial 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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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
IT978181B (en) 1974-09-20
FR2168575B1 (en) 1977-02-04
JPS4883817A (en) 1973-11-08
NL7217774A (en) 1973-07-24
ES410589A1 (en) 1975-12-16
FR2168575A1 (en) 1973-08-31
US3763334A (en) 1973-10-02
DE2302385A1 (en) 1973-07-26
BE794025A (en) 1973-05-02

Similar Documents

Publication Publication Date Title
GB543716A (en) Improvements in magnetic structures employing permanent magnets
GB927545A (en) Improvements in magnet systems
GB1409789A (en) Magnet assembly
US3836733A (en) Electro-acoustic armature transducer
SU583783A3 (en) Converting device
GB660997A (en) Improvements in or relating to electro-magnetic translating devices
GB747736A (en) Improvements in or relating to devices comprising a circuit of highly-permeable material and a permanent magnet for producing a pre-magnetizing field in said circuit
US3041483A (en) Electromagnetic measuring coil
US3668321A (en) Magnetic coupler
GB1460744A (en) Loud speakers of the moving coil type
GB555105A (en) Electromagnetic devices
GB722694A (en) Improvements in or relating to circuit arrangements, each comprising a magnetron to be excited by pulses
GB1045807A (en) Loudspeaker
GB445935A (en) An improved sound reproducing device
GB672467A (en) Improvements in and relating to sound reproducing devices
GB1164307A (en) Magnets.
GB998986A (en) Loudspeaker structure
US1630380A (en) Loud-speaker unit
US1704084A (en) Sound reproducer
GB1336481A (en) Method of magnetizing a permanent magnet assembly and a per manent magnet assembly when prepared by the method
US3584161A (en) Balanced magnetic transducer
GB643465A (en) Improvements relating to loudspeakers
GB621011A (en) Improvements relating to magnetic devices
GB517572A (en) Improvements in or relating to electro-magnetic switches or the like
GB332238A (en) Improvements in or relating to electro-magnetic vibratory devices, such for example as loudspeakers

Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed