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GB893838A - Improvements relating to loudspeakers - Google Patents

Improvements relating to loudspeakers

Info

Publication number
GB893838A
GB893838A GB3277358A GB3277358A GB893838A GB 893838 A GB893838 A GB 893838A GB 3277358 A GB3277358 A GB 3277358A GB 3277358 A GB3277358 A GB 3277358A GB 893838 A GB893838 A GB 893838A
Authority
GB
United Kingdom
Prior art keywords
air gap
coil
plate
magnetic
flux
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
GB3277358A
Inventor
Guy Rupert Fountain
Michael Hugh Fountain
Ronald Hastings Rackham
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.)
Tannoy Ltd
Original Assignee
Tannoy 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 Tannoy Ltd filed Critical Tannoy Ltd
Priority to GB3277358A priority Critical patent/GB893838A/en
Publication of GB893838A publication Critical patent/GB893838A/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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
    • 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
    • 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)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

893,838. Loud-speakers. TANNOY Ltd. Jan. 1, 1960 [Oct. 14, 1958], No. 32773/58. Class 40 (4). In a moving coil loud-speaker having two diaphragms, driven by respective speech coils, in separate air gaps arranged in series in a magnetic circuit, with one air gap having a higher flux density than the other, a magnetic shunt of small enough cross-sectional area to be appreciably saturated by the magnetic flux bridges the other air gap. A low-frequency diaphragm 1 is operated by a coil 14 moving in an annular air gap 15 surrounding one end of a cylindrical polepiece 16, while a high-frequency diaphragm 2 is operated by a coil 10 moving in an air gap 18 at the opposite end of the polepiece 16, a sleeve 21 constituting the ring magnet of the loud-speaker. A plate 19, centred about the axis of the system by a non-magnetic ring 23, completes the magnetic circuit between air gap 15 and sleeve 21 and a thinner plate 20 in closer proximity to coil 17 than plate 19 is to coil 14, completes the circuit at the other end of the polepiece 16. A flange 27, of small cross-sectional area so that it may be easily saturated, on plate 20, shunts the air gap 18 but does not alter the flux through the air gap 18 by a significant amount, although it causes the flux in air gap 15 to be appreciably increased (up to 20%), thus allowing a greater energy input to be used with the larger diaphragm 1.
GB3277358A 1958-10-14 1958-10-14 Improvements relating to loudspeakers Expired GB893838A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3277358A GB893838A (en) 1958-10-14 1958-10-14 Improvements relating to loudspeakers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3277358A GB893838A (en) 1958-10-14 1958-10-14 Improvements relating to loudspeakers

Publications (1)

Publication Number Publication Date
GB893838A true GB893838A (en) 1962-04-11

Family

ID=10343779

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3277358A Expired GB893838A (en) 1958-10-14 1958-10-14 Improvements relating to loudspeakers

Country Status (1)

Country Link
GB (1) GB893838A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2906541A1 (en) * 1978-02-22 1979-08-23 Tannoy Products Ltd VOICE COIL SPEAKER
AU2012205361B2 (en) * 2011-01-13 2016-06-16 Chris PELONIS Rhomboid shaped acoustic speaker

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2906541A1 (en) * 1978-02-22 1979-08-23 Tannoy Products Ltd VOICE COIL SPEAKER
US4256930A (en) * 1978-02-22 1981-03-17 Tannoy Products Limited Loudspeaker having improved magnetic assembly
AU2012205361B2 (en) * 2011-01-13 2016-06-16 Chris PELONIS Rhomboid shaped acoustic speaker

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