EP0339820A3 - Electromagnetic transducer - Google Patents

Electromagnetic transducer Download PDF

Info

Publication number
EP0339820A3
EP0339820A3 EP19890303509 EP89303509A EP0339820A3 EP 0339820 A3 EP0339820 A3 EP 0339820A3 EP 19890303509 EP19890303509 EP 19890303509 EP 89303509 A EP89303509 A EP 89303509A EP 0339820 A3 EP0339820 A3 EP 0339820A3
Authority
EP
European Patent Office
Prior art keywords
secondary coil
electromagnetic transducer
moving coil
coil
induction
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.)
Withdrawn
Application number
EP19890303509
Other languages
German (de)
French (fr)
Other versions
EP0339820A2 (en
Inventor
Saad Gabr
Yasser Gabr
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
Publication of EP0339820A2 publication Critical patent/EP0339820A2/en
Publication of EP0339820A3 publication Critical patent/EP0339820A3/en
Withdrawn legal-status Critical Current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
    • H04R2209/043—Short circuited voice coils driven by induction

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

In a moving coil electro magnetic transducer, a top plate (12), a back plate (16) and a pole piece (18) of the magnetic circuit of a magnet (14) may act as a shorted secondary coil around a moving coil (24). To prevent current flow in such a secondary coil wasting energy, the invention provides that at least one and preferably all such components are made electrically discontinuous by providing them with a radial slit (20) thereby to reduce energy dissipated by induction.
EP19890303509 1988-04-26 1989-04-10 Electromagnetic transducer Withdrawn EP0339820A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888809805A GB8809805D0 (en) 1988-04-26 1988-04-26 Electromagnetic transducer
GB8809805 1988-04-26

Publications (2)

Publication Number Publication Date
EP0339820A2 EP0339820A2 (en) 1989-11-02
EP0339820A3 true EP0339820A3 (en) 1991-03-20

Family

ID=10635840

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890303509 Withdrawn EP0339820A3 (en) 1988-04-26 1989-04-10 Electromagnetic transducer

Country Status (4)

Country Link
EP (1) EP0339820A3 (en)
JP (1) JPH01318399A (en)
AU (1) AU3301289A (en)
GB (1) GB8809805D0 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04103796U (en) * 1991-01-24 1992-09-07 株式会社ケンウツド Magnetic circuit for speakers and voice coil used therein
JPH0761200B2 (en) * 1991-10-16 1995-06-28 ラックス株式会社 Speaker
JP4630319B2 (en) * 2007-09-10 2011-02-09 宏一 平岡 Horn speaker

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR858268A (en) * 1938-05-04 1940-11-21 Henry Hugues & Son Improvements to electro-acoustic transmitters and similar devices
DE2131035A1 (en) * 1971-06-23 1973-01-11 Magnetfab Bonn Gmbh Annular loudspeaker magnet - with iron-epoxy resin powder poles of reduced electric conductivity
JPS5627600A (en) * 1979-08-10 1981-03-17 Kanenori Kishi Magnetic circuit of moving coil type transducer
US4293741A (en) * 1979-06-21 1981-10-06 Digre Clifford B Magnet assembly
US4295011A (en) * 1979-09-11 1981-10-13 Epicure Products Inc. Linear excursion-constant inductance loudspeaker
EP0339855A2 (en) * 1988-04-27 1989-11-02 Sony Corporation Electrodynamic loudspeaker

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR858268A (en) * 1938-05-04 1940-11-21 Henry Hugues & Son Improvements to electro-acoustic transmitters and similar devices
DE2131035A1 (en) * 1971-06-23 1973-01-11 Magnetfab Bonn Gmbh Annular loudspeaker magnet - with iron-epoxy resin powder poles of reduced electric conductivity
US4293741A (en) * 1979-06-21 1981-10-06 Digre Clifford B Magnet assembly
JPS5627600A (en) * 1979-08-10 1981-03-17 Kanenori Kishi Magnetic circuit of moving coil type transducer
US4295011A (en) * 1979-09-11 1981-10-13 Epicure Products Inc. Linear excursion-constant inductance loudspeaker
EP0339855A2 (en) * 1988-04-27 1989-11-02 Sony Corporation Electrodynamic loudspeaker

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 5, no. 78 (E-58)[750], 22nd May 1981; & JP-A-56 27 600 (OSANORI KISHI) 17-03-1981 *

Also Published As

Publication number Publication date
AU3301289A (en) 1989-11-02
JPH01318399A (en) 1989-12-22
GB8809805D0 (en) 1988-06-02
EP0339820A2 (en) 1989-11-02

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