JPS57133798A - Electromagnetic converter - Google Patents

Electromagnetic converter

Info

Publication number
JPS57133798A
JPS57133798A JP1989281A JP1989281A JPS57133798A JP S57133798 A JPS57133798 A JP S57133798A JP 1989281 A JP1989281 A JP 1989281A JP 1989281 A JP1989281 A JP 1989281A JP S57133798 A JPS57133798 A JP S57133798A
Authority
JP
Japan
Prior art keywords
yoke
fixed
external
center
permanent magnet
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
JP1989281A
Other languages
Japanese (ja)
Inventor
Akira Nikaido
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.)
Citizen Holdings Co Ltd
Citizen Watch Co Ltd
Original Assignee
Citizen Holdings Co Ltd
Citizen Watch Co 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 Citizen Holdings Co Ltd, Citizen Watch Co Ltd filed Critical Citizen Holdings Co Ltd
Priority to JP1989281A priority Critical patent/JPS57133798A/en
Publication of JPS57133798A publication Critical patent/JPS57133798A/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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

PURPOSE:To constitute an electromagnetic converter with good conversion efficiency, by using a hollow disc permanent magnet which is magnetized in different poles at the center and external circumference. CONSTITUTION:A magnetic ring 13 is closingly fixed to the inner circumference of a non-magnetic substance gap 12, which is located at the center of a diaphragm plate 16 and fixed with welding or adhesives. An external yoke 9 is fixed at the external circumference of a hollow disc permanent magnet 8 and the center yoke 10 is fixed at the hollow part of the said permanent magnet 8, and magnet poles by the permanent magnet consist of a magnet pole 9a of the external circumferential yoke 9, magnet poles 10a, 10b of the center yoke and a concentric air gap opposed with them. The magnetic circuit is fixed in a holder 7 and the diaphragm plate 16 is supported by an external ridge 7a of the holder 7. Thus, the magnetic ring 13 is constituted that it can be moved axially in the air gap between the external circumferential yoke 9 and the center yoke 10.
JP1989281A 1981-02-13 1981-02-13 Electromagnetic converter Pending JPS57133798A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1989281A JPS57133798A (en) 1981-02-13 1981-02-13 Electromagnetic converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1989281A JPS57133798A (en) 1981-02-13 1981-02-13 Electromagnetic converter

Publications (1)

Publication Number Publication Date
JPS57133798A true JPS57133798A (en) 1982-08-18

Family

ID=12011841

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1989281A Pending JPS57133798A (en) 1981-02-13 1981-02-13 Electromagnetic converter

Country Status (1)

Country Link
JP (1) JPS57133798A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6768806B1 (en) 1998-03-19 2004-07-27 Harman International Industries, Incorporated Shorting rings in dual-coil dual-gap loudspeaker drivers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6768806B1 (en) 1998-03-19 2004-07-27 Harman International Industries, Incorporated Shorting rings in dual-coil dual-gap loudspeaker drivers

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