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JPS5627600A - Magnetic circuit of moving coil type transducer - Google Patents

Magnetic circuit of moving coil type transducer

Info

Publication number
JPS5627600A
JPS5627600A JP10253879A JP10253879A JPS5627600A JP S5627600 A JPS5627600 A JP S5627600A JP 10253879 A JP10253879 A JP 10253879A JP 10253879 A JP10253879 A JP 10253879A JP S5627600 A JPS5627600 A JP S5627600A
Authority
JP
Japan
Prior art keywords
slits
magnetic
moving coil
center pole
magnetic field
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.)
Pending
Application number
JP10253879A
Other languages
Japanese (ja)
Inventor
Kanenori Kishi
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP10253879A priority Critical patent/JPS5627600A/en
Publication of JPS5627600A publication Critical patent/JPS5627600A/en
Pending 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
    • H04R2209/021—Reduction of eddy currents in the magnetic circuit of electrodynamic loudspeaker transducer

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

PURPOSE:To distribute a magnetic field evenly while suppressing the generation of an eddy current by equally dividing a center pole by radially forming slits at the magnetic pole part of the center pole and a front plate. CONSTITUTION:The columnar center pole has the tip part, fitted in a moving coil, cut by four narrow-width slits 10 penetrating center point 9 to obtain eight equal parts 14 of 45 deg.. The cutting depth of each slit is nearly equal to the maximum amplitude of the moving coil and the number of slits is changeable in accordance with the diameter of the center pole and the purpose of use, but normally about 2-6. Consequently, since the slits are cut in the passing direction of magnetic flux, the possibility that the magnetic resistance increases is a little and the deterioration of the magnetic density of a gap magnetic field is small. Additionally, the cutting effect of slits and the effect of conduction layer formation are involved mutually, so that the generation of an eddy current. Further, an even magnetic field is provided through equal-angle division of slits.
JP10253879A 1979-08-10 1979-08-10 Magnetic circuit of moving coil type transducer Pending JPS5627600A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10253879A JPS5627600A (en) 1979-08-10 1979-08-10 Magnetic circuit of moving coil type transducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10253879A JPS5627600A (en) 1979-08-10 1979-08-10 Magnetic circuit of moving coil type transducer

Publications (1)

Publication Number Publication Date
JPS5627600A true JPS5627600A (en) 1981-03-17

Family

ID=14330041

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10253879A Pending JPS5627600A (en) 1979-08-10 1979-08-10 Magnetic circuit of moving coil type transducer

Country Status (1)

Country Link
JP (1) JPS5627600A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990005435A1 (en) * 1988-11-07 1990-05-17 Harman International Industries, Incorporated Shallow loudspeaker with slotted magnet structure
EP0339820A3 (en) * 1988-04-26 1991-03-20 Saad Gabr Electromagnetic transducer
US5042072A (en) * 1989-04-14 1991-08-20 Harman International Industries, Inc. Self-cooled loudspeaker
US5081684A (en) * 1988-11-07 1992-01-14 Harman International Industries, Incorporated Shallow loudspeaker with slotted magnet structure
US5883967A (en) * 1997-04-15 1999-03-16 Harman International Industries, Incorporated Slotted diaphragm loudspeaker
EP1137320A3 (en) * 2000-03-23 2003-01-02 Matsushita Electric Industrial Co., Ltd. Loudspeaker
EP2512153A1 (en) * 2011-04-12 2012-10-17 Harman International Industries, Incorporated Loudspeaker magnet assembly
EP2512154A1 (en) * 2011-04-12 2012-10-17 Harman International Industries, Incorporated Loudspeaker magnet having a channel
CN104320745A (en) * 2014-10-24 2015-01-28 歌尔声学股份有限公司 Speaker

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5187025A (en) * 1975-01-28 1976-07-30 Mitsubishi Electric Corp SUPIIKANOJIKI KAIRO

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5187025A (en) * 1975-01-28 1976-07-30 Mitsubishi Electric Corp SUPIIKANOJIKI KAIRO

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0339820A3 (en) * 1988-04-26 1991-03-20 Saad Gabr Electromagnetic transducer
WO1990005435A1 (en) * 1988-11-07 1990-05-17 Harman International Industries, Incorporated Shallow loudspeaker with slotted magnet structure
US5081684A (en) * 1988-11-07 1992-01-14 Harman International Industries, Incorporated Shallow loudspeaker with slotted magnet structure
AU620185B2 (en) * 1988-11-07 1992-02-13 Harman International Industries Incorporated Shallow loudspeaker with slotted magnet structure
US5042072A (en) * 1989-04-14 1991-08-20 Harman International Industries, Inc. Self-cooled loudspeaker
US5883967A (en) * 1997-04-15 1999-03-16 Harman International Industries, Incorporated Slotted diaphragm loudspeaker
EP1137320A3 (en) * 2000-03-23 2003-01-02 Matsushita Electric Industrial Co., Ltd. Loudspeaker
US6836551B2 (en) 2000-03-23 2004-12-28 Matsushita Electric Industrial Co., Ltd. Loudspeaker
EP2512153A1 (en) * 2011-04-12 2012-10-17 Harman International Industries, Incorporated Loudspeaker magnet assembly
EP2512154A1 (en) * 2011-04-12 2012-10-17 Harman International Industries, Incorporated Loudspeaker magnet having a channel
US8548191B2 (en) 2011-04-12 2013-10-01 Harman International Industries, Incorporated Loudspeaker magnet having a channel
US8879774B2 (en) 2011-04-12 2014-11-04 Harman International Industries, Incorporated Loudspeaker magnet assembly with two inner magnets comprising a central bore
CN104320745A (en) * 2014-10-24 2015-01-28 歌尔声学股份有限公司 Speaker
US9763011B2 (en) 2014-10-24 2017-09-12 Goertek, Inc. Speaker

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