GB409433A - Improvements in and relating to loud speakers - Google Patents

Improvements in and relating to loud speakers

Info

Publication number
GB409433A
GB409433A GB33455/32A GB3345532A GB409433A GB 409433 A GB409433 A GB 409433A GB 33455/32 A GB33455/32 A GB 33455/32A GB 3345532 A GB3345532 A GB 3345532A GB 409433 A GB409433 A GB 409433A
Authority
GB
United Kingdom
Prior art keywords
moving coil
wound
loud
series
parallel
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
GB33455/32A
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 GB409433A publication Critical patent/GB409433A/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
    • 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)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

409,433. Loud - speakers. BRZESKI, H., 7, Szopena, Warsaw. Nov. 25, 1932, No. 33455. [Class 40 (iv).] In a loud-speaker, the magnetic field due to the speech currents is limited to a small space round the moving coil so that energy losses due to hysteresis and eddy currents are reduced. In one embodiment, the pole-pieces have inserts 15, 16, Fig. 1, of material of high magnetic permeability, such as permalloy or ferrocart. The former 13 on which the moving coil is wound may be of similar material. In another embodiment, two moving coils, Fig. 3, wound in opposite directions may be utilised, each driving separate oppositely directed diaphragms. This arrangement is stated to overcome the effect of energizing the magnet system with badly smoothed alternating current. Preferably the moving coil is wound in superposed layers, the potential difference between corresponding turns of adjacent layers being constant. The windings may be tapped and the sections connected in series, parallel or in series-parallel to adapt them to the amplifier, Figs. 6, 7 (not shown). The leads 21, Fig. 1, from the moving coil are led to pins 20 contacting with springs 19 connected to terminals 18.
GB33455/32A 1932-11-09 1932-11-25 Improvements in and relating to loud speakers Expired GB409433A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1976874X 1932-11-09

Publications (1)

Publication Number Publication Date
GB409433A true GB409433A (en) 1934-05-03

Family

ID=7853775

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33455/32A Expired GB409433A (en) 1932-11-09 1932-11-25 Improvements in and relating to loud speakers

Country Status (3)

Country Link
US (1) US1976874A (en)
FR (1) FR749472A (en)
GB (1) GB409433A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2137047A (en) * 1983-03-15 1984-09-26 Donald Maynard Chave Moving coil loudspeakers

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2538164A (en) * 1946-07-08 1951-01-16 Pickering Associates Inc Electromagnetic sound reproducer
US2547565A (en) * 1946-09-26 1951-04-03 Wright Zimmerman Inc Speaker having a tubular pot
GB625591A (en) * 1947-03-04 1949-06-30 Paul Gustavus Adolphus Helmuth Improvements in magnets
US2538691A (en) * 1948-07-19 1951-01-16 Richard K Y Kim Voice coil for radio loud-speakers
US2745083A (en) * 1949-07-07 1956-05-08 Benjamin L Snavely Transducer, elements therefor, and methods of assembly thereof
DE1280324B (en) * 1965-02-17 1968-10-17 Paul Mauz Dynamic electro-acoustic converter
US3632904A (en) * 1970-03-24 1972-01-04 Paul Mauz Moving coil loudspeaker with eddy current suppression
JPS5023613B1 (en) * 1970-04-23 1975-08-08
JPS5235294B2 (en) * 1971-12-17 1977-09-08
JPS5234212B2 (en) * 1971-12-17 1977-09-02
WO1994016536A1 (en) * 1993-01-06 1994-07-21 Velodyne Acoustics, Inc. Speaker containing dual coil
AU679967B2 (en) * 1993-02-08 1997-07-17 Aura Systems, Inc. Double ended field coil actuator
US5487114A (en) * 1994-02-02 1996-01-23 Dinh; Khanh Magnetless speaker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2137047A (en) * 1983-03-15 1984-09-26 Donald Maynard Chave Moving coil loudspeakers

Also Published As

Publication number Publication date
US1976874A (en) 1934-10-16
FR749472A (en) 1933-07-24

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