GB860439A - Improvements in or relating to magnetic arrangements - Google Patents

Improvements in or relating to magnetic arrangements

Info

Publication number
GB860439A
GB860439A GB12228/57A GB1222857A GB860439A GB 860439 A GB860439 A GB 860439A GB 12228/57 A GB12228/57 A GB 12228/57A GB 1222857 A GB1222857 A GB 1222857A GB 860439 A GB860439 A GB 860439A
Authority
GB
United Kingdom
Prior art keywords
magnets
magnet
auxiliary
operating region
main
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
GB12228/57A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB860439A publication Critical patent/GB860439A/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
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0273—Magnetic circuits with PM for magnetic field generation
    • H01F7/0289—Transducers, loudspeakers, moving coil arrangements
    • 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

860,439. Loud-speaker magnets. PHILIPS ELECTRICAL INDUSTRIES Ltd. April 15, 1957 [April 18, 1956], No. 12228/57. Class 40 (4). [Also in Groups XXXV and XL (a)] A magnet arrangement shown in Fig. 1 as applied to a loud-speaker comprises a main permanent magnet 1, at least one magneticallysoft part 3 which transmits the magnetic flux to an operating region, i.e. an air-gap 4, and at least one auxiliary permanent magnet 5 of different material and field strength from those of the main magnet, the auxiliary magnet being spaced away from the operating region and being so polarized and positioned in a region of stray flux as to increase the flux produced at the operating region and reduce the stray flux produced outside the latter, at least one of the magnets being of annular cross-section and radially magnetized, and at least another of the magnets being cylindrical and axially magnetized. In another embodiment an axiallymagnetized main magnet disc 1, Fig. 3, is disposed between two magnetically-soft discs 9, 10 about which are two auxiliary magnets 12, 13. Reference has been directed by the Comptroller to Specification 775,250.
GB12228/57A 1956-04-18 1957-04-15 Improvements in or relating to magnetic arrangements Expired GB860439A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE860439X 1956-04-18

Publications (1)

Publication Number Publication Date
GB860439A true GB860439A (en) 1961-02-08

Family

ID=6791821

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12228/57A Expired GB860439A (en) 1956-04-18 1957-04-15 Improvements in or relating to magnetic arrangements

Country Status (4)

Country Link
US (1) US2895092A (en)
BE (1) BE556726A (en)
FR (1) FR1171263A (en)
GB (1) GB860439A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1063658A3 (en) * 1999-06-25 2002-07-03 Delta Tooling Co., Ltd. Magnetic circuit
GB2440768A (en) * 2006-08-08 2008-02-13 Selex Sensors & Airborne Sys Magnet assembly for moving coil actuator
US7705702B2 (en) 2006-08-08 2010-04-27 Selex Galileo Ltd Actuator

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1130517B (en) * 1959-12-22 1962-05-30 Baermann Max Magnet arrangement for large-angle moving coil measuring instruments
US3134057A (en) * 1960-07-11 1964-05-19 Sumitomo Metal Ind Magnetic circuit for the deflection of flux leakage
US3120631A (en) * 1960-11-14 1964-02-04 Exxon Research Engineering Co Electromagnet for supporting and dropping weights
US3147350A (en) * 1961-12-18 1964-09-01 Lockheed Aircraft Corp Magnetically operated reed switch
US3198254A (en) * 1962-05-08 1965-08-03 Baker Oil Tools Inc Method and apparatus for completing wells
US3454913A (en) * 1966-11-14 1969-07-08 Eriez Mfg Co Permanent magnetic pulley
US3478289A (en) * 1968-02-12 1969-11-11 Robert A Parnell Permanent magnet assembly for a loudspeaker assembly
US3737822A (en) * 1970-06-10 1973-06-05 Magnetics Int Inc Magnetic separator
US4321652A (en) * 1979-04-30 1982-03-23 Minnesota Mining And Manufacturing Co. Low voltage transformer relay
US4363639A (en) * 1981-03-09 1982-12-14 Iowa State University Research Foundation, Inc. Gas trap for removing atmospheric pollutants and method of operation
US4549155A (en) * 1982-09-20 1985-10-22 The United States Of America As Represented By The United States Department Of Energy Permanent magnet multipole with adjustable strength
JPS59139794A (en) * 1983-01-31 1984-08-10 Ibuki Kogyo Kk Horn speaker eliminating leaked magnetic field
US4647887A (en) * 1984-12-24 1987-03-03 The United States Of America As Represented By The Secretary Of The Army Lightweight cladding for magnetic circuits
US5142260A (en) * 1991-03-08 1992-08-25 Harman International Industries, Incorporated Transducer motor assembly
US5380430A (en) * 1992-07-24 1995-01-10 Overton; James M. Magnetizing apparatus for treatment of fluids
US5409236A (en) * 1993-12-23 1995-04-25 Therrien; Joel M. Magnetic game or puzzle and method for making same
US6573817B2 (en) 2001-03-30 2003-06-03 Sti Optronics, Inc. Variable-strength multipole beamline magnet
JP4845677B2 (en) * 2006-10-31 2011-12-28 三洋電機株式会社 Electroacoustic transducer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2398653A (en) * 1942-10-15 1946-04-16 Gen Electric Magnetic structure

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1063658A3 (en) * 1999-06-25 2002-07-03 Delta Tooling Co., Ltd. Magnetic circuit
GB2440768A (en) * 2006-08-08 2008-02-13 Selex Sensors & Airborne Sys Magnet assembly for moving coil actuator
US7705702B2 (en) 2006-08-08 2010-04-27 Selex Galileo Ltd Actuator

Also Published As

Publication number Publication date
BE556726A (en)
FR1171263A (en) 1959-01-23
US2895092A (en) 1959-07-14

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