NO975614D0 - Magnetsystem - Google Patents

Magnetsystem

Info

Publication number
NO975614D0
NO975614D0 NO975614A NO975614A NO975614D0 NO 975614 D0 NO975614 D0 NO 975614D0 NO 975614 A NO975614 A NO 975614A NO 975614 A NO975614 A NO 975614A NO 975614 D0 NO975614 D0 NO 975614D0
Authority
NO
Norway
Prior art keywords
magnet system
magnet
Prior art date
Application number
NO975614A
Other languages
English (en)
Other versions
NO975614A (no
NO305270B1 (no
Inventor
Bjoern Boerja
Original Assignee
Seas Fabrikker As
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 Seas Fabrikker As filed Critical Seas Fabrikker As
Priority to NO975614A priority Critical patent/NO305270B1/no
Publication of NO975614D0 publication Critical patent/NO975614D0/no
Priority to US09/201,863 priority patent/US6020805A/en
Priority to DE69836309T priority patent/DE69836309T2/de
Priority to DK98850184T priority patent/DK0921707T3/da
Priority to EP98850184A priority patent/EP0921707B1/en
Priority to CNB981223990A priority patent/CN1178549C/zh
Publication of NO975614A publication Critical patent/NO975614A/no
Publication of NO305270B1 publication Critical patent/NO305270B1/no

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)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
NO975614A 1997-04-12 1997-12-04 Permanentmagnetmontasje NO305270B1 (no)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NO975614A NO305270B1 (no) 1997-12-04 1997-12-04 Permanentmagnetmontasje
US09/201,863 US6020805A (en) 1997-04-12 1998-12-01 Permanent magnet assembly
DE69836309T DE69836309T2 (de) 1997-12-04 1998-12-02 Permanentmagnetanordnung
DK98850184T DK0921707T3 (da) 1997-12-04 1998-12-02 Permanentmagnetindretning
EP98850184A EP0921707B1 (en) 1997-12-04 1998-12-02 Permanent magnet assembly
CNB981223990A CN1178549C (zh) 1997-12-04 1998-12-04 永久磁铁组件

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO975614A NO305270B1 (no) 1997-12-04 1997-12-04 Permanentmagnetmontasje

Publications (3)

Publication Number Publication Date
NO975614D0 true NO975614D0 (no) 1997-12-04
NO975614A NO975614A (no) 1999-04-26
NO305270B1 NO305270B1 (no) 1999-04-26

Family

ID=19901404

Family Applications (1)

Application Number Title Priority Date Filing Date
NO975614A NO305270B1 (no) 1997-04-12 1997-12-04 Permanentmagnetmontasje

Country Status (6)

Country Link
US (1) US6020805A (no)
EP (1) EP0921707B1 (no)
CN (1) CN1178549C (no)
DE (1) DE69836309T2 (no)
DK (1) DK0921707T3 (no)
NO (1) NO305270B1 (no)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1350414A1 (en) * 2000-12-26 2003-10-08 Anders Sagren Concentric co-planar multiband electro-acoustic converter
EP1381252A1 (en) * 2002-07-09 2004-01-14 FOCAL JMLab Multi-ferrite magnetic system for loudspeaker
GB0223654D0 (en) * 2002-10-10 2002-11-20 New Transducers Ltd Electromagnetic actuator
JP4078322B2 (ja) * 2004-03-11 2008-04-23 ホシデン株式会社 スピーカー
EP1808126B1 (en) * 2004-09-30 2012-12-26 Hitachi Metals, Ltd. Magnetic field generator for mri
JP2007040316A (ja) * 2005-07-29 2007-02-15 Smc Corp 環状磁石およびそれを用いた流体圧シリンダ
US7706563B2 (en) * 2005-12-19 2010-04-27 Harman International Industries, Incorporated Concentric radial ring motor
US20070297639A1 (en) * 2006-06-21 2007-12-27 Noll Michael A Multiple magnet loudspeaker
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
WO2009155691A1 (en) 2008-06-24 2009-12-30 Fallone Gino B Magnetic assembly and method for defining a magnetic field for an imaging volume
FR2960738B1 (fr) * 2010-05-28 2015-09-25 Focal Jmlab Haut-parleur acoustique
GB2492360A (en) * 2011-06-29 2013-01-02 Gp Acoustics Internat Ltd Permanent rare-earth magnet assembly for a loudspeaker
ITMI20121411A1 (it) * 2012-08-08 2014-02-09 Ciare S R L Assemblato magnetico per altoparlante.
JP5857932B2 (ja) * 2012-10-03 2016-02-10 アイシン精機株式会社 センサユニットの製造方法
CN105282662B (zh) * 2015-11-09 2019-01-22 黄顺君 一种与双绕组反并动圈同构同工的双径向磁路

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3478289A (en) * 1968-02-12 1969-11-11 Robert A Parnell Permanent magnet assembly for a loudspeaker assembly
US3979566A (en) * 1973-12-12 1976-09-07 Erazm Alfred Willy Electromagnetic transducer
US4679022A (en) * 1985-12-27 1987-07-07 Sumitomo Special Metal Co. Ltd. Magnetic field generating device for NMR-CT
US4829277A (en) * 1986-11-20 1989-05-09 General Motors Corporation Isotropic rare earth-iron field magnets for magnetic resonance imaging
JP2558387B2 (ja) * 1990-11-16 1996-11-27 株式会社日立製作所 ボイスコイルモータおよび磁気ディスク装置
WO1993003586A1 (en) * 1991-08-05 1993-02-18 Aura Systems, Inc. Voice coil actuator
US5461677A (en) * 1993-09-16 1995-10-24 Ferrofluidics Corporation Loudspeaker
US5661446A (en) * 1995-06-07 1997-08-26 Mts Systems Corporation Electromagnetic actuator
US5786741A (en) * 1995-12-21 1998-07-28 Aura Systems, Inc. Polygon magnet structure for voice coil actuator

Also Published As

Publication number Publication date
EP0921707A2 (en) 1999-06-09
CN1219835A (zh) 1999-06-16
DK0921707T3 (da) 2007-02-12
NO975614A (no) 1999-04-26
EP0921707B1 (en) 2006-11-02
DE69836309D1 (de) 2006-12-14
US6020805A (en) 2000-02-01
DE69836309T2 (de) 2007-05-24
NO305270B1 (no) 1999-04-26
CN1178549C (zh) 2004-12-01
EP0921707A3 (en) 2004-07-14

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