GB664812A - Improvements in or relating to loudspeakers - Google Patents

Improvements in or relating to loudspeakers

Info

Publication number
GB664812A
GB664812A GB866647A GB866647A GB664812A GB 664812 A GB664812 A GB 664812A GB 866647 A GB866647 A GB 866647A GB 866647 A GB866647 A GB 866647A GB 664812 A GB664812 A GB 664812A
Authority
GB
United Kingdom
Prior art keywords
moving coil
march
loud
main winding
magnetic circuit
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
GB866647A
Inventor
Roger Chapman
Robert Henry Trier
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.)
Kolster Brandes Ltd
Original Assignee
Kolster Brandes 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 Kolster Brandes Ltd filed Critical Kolster Brandes Ltd
Priority to GB866647A priority Critical patent/GB664812A/en
Publication of GB664812A publication Critical patent/GB664812A/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
    • H04R9/06—Loudspeakers
    • 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)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

664,812. Loud - speakers. KOLSTER BRANDES, Ltd. March 25, 1948 [March 31, 1947], No. 8666/47. Class 40 (iv). In a moving coil loud-speaker, the moving coil comprises a tube 1, Fig. 1, of conducting material such as copper or aluminium or a short-circuited loop 13, Fig. 2, and is energized by induction from the main winding 6. In Fig. 1, the magnetic circuit is in the form of the usual pot magnet with a central pole 3 which consists of a bunch of wires moulded into a solid rod by embedding in plastic material or otherwise. The pot 4 and disc 5 may be laminated. In Fig. 2, in which the diaphragm is pyramidal, the coil 13 being of square section and having two sides operating in parallel air gaps, the magnetic circuit is made up of E-shaped and I-shaped laminations 9, 10. When the main winding 6 is connected in the anode circuit of an amplifier the standing current of the valve provides the steady flux and the A.C. component induces current in the moving coil.
GB866647A 1947-03-31 1947-03-31 Improvements in or relating to loudspeakers Expired GB664812A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB866647A GB664812A (en) 1947-03-31 1947-03-31 Improvements in or relating to loudspeakers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB866647A GB664812A (en) 1947-03-31 1947-03-31 Improvements in or relating to loudspeakers

Publications (1)

Publication Number Publication Date
GB664812A true GB664812A (en) 1952-01-16

Family

ID=9856878

Family Applications (1)

Application Number Title Priority Date Filing Date
GB866647A Expired GB664812A (en) 1947-03-31 1947-03-31 Improvements in or relating to loudspeakers

Country Status (1)

Country Link
GB (1) GB664812A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2118398A (en) * 1982-04-14 1983-10-26 Boaz Elieli Moving coil electroacoustic transducers
ITFI20110138A1 (en) * 2011-07-15 2013-01-16 Claudio Lastrucci "ACOUSTIC SYSTEM WITH ELECTRODYNAMIC SPEAKER FOR INDEPENDENT EXCITEMENT AND ITS CONTROL METHOD"

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2118398A (en) * 1982-04-14 1983-10-26 Boaz Elieli Moving coil electroacoustic transducers
ITFI20110138A1 (en) * 2011-07-15 2013-01-16 Claudio Lastrucci "ACOUSTIC SYSTEM WITH ELECTRODYNAMIC SPEAKER FOR INDEPENDENT EXCITEMENT AND ITS CONTROL METHOD"

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