GB665815A - Improvements in sound reproducing devices - Google Patents

Improvements in sound reproducing devices

Info

Publication number
GB665815A
GB665815A GB129/46A GB12946A GB665815A GB 665815 A GB665815 A GB 665815A GB 129/46 A GB129/46 A GB 129/46A GB 12946 A GB12946 A GB 12946A GB 665815 A GB665815 A GB 665815A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
magnet
polepiece
centre pole
pole
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
GB129/46A
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi 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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB665815A publication Critical patent/GB665815A/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
    • H04R9/025—Magnetic circuit

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • 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

665,815. Loud-speakers. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Jan. 2, 1946 [Jan. 2, 1945], No. 129/46. Class 40 (iv). A sound reproducing device comprises an outer magnet 16 having a polepiece 17, and a centre pole 18 of opposite polarity, forming an annular air-gap for a coil 14 which operates a diaphragm 10, the centre pole 18 being hollow and containing a magnet 21 having a polarity opposite to that of the centre pole 18 with which it forms an air-gap for a further coil 15 operating a further diaphragm 11 arranged within the diaphragm 10. The inner diaphragm is connected so as to reproduce the higher frequencies and the outer diaphragm to reproduce the lower frequencies. The inner magnet assembly, consisting of a soft iron cup-shaped portion 22, 23 which supports the magnet 21 and polepiece 20 is readily detachable as a unit. The outer, conical diaphragm 10 is attached to the polepiece 17 at its outer edge by spider 24 and at its inner edge by a flexible member 28. The inner conical diaphragm 11 is attached to polepiece 20 at its outer edge by the spider 29 and at its inner edge by the flexible member 33 which is connected to a metal ring 32 anchored to the pole-piece 20. A compliant member 34 interposed between the two diaphragms allows them to vibrate independently. In a modification, Fig. 3 (not shown), the centre pole is solid and has its forward end provided with a recess, the magnet 21 being attached to a base which is detachably mounted in the bottom of the recess. In a further modification, Fig. 4 (not shown), it is arranged that the outer cone is geometrically a continuation of the inner cone. In this arrangement, the innermost magnet is mounted in a cup detachably mounted in a recess in an otherwise solid centre pole.
GB129/46A 1945-01-02 1946-01-02 Improvements in sound reproducing devices Expired GB665815A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US665815XA 1945-01-02 1945-01-02

Publications (1)

Publication Number Publication Date
GB665815A true GB665815A (en) 1952-01-30

Family

ID=22070412

Family Applications (1)

Application Number Title Priority Date Filing Date
GB129/46A Expired GB665815A (en) 1945-01-02 1946-01-02 Improvements in sound reproducing devices

Country Status (1)

Country Link
GB (1) GB665815A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4220832A (en) * 1976-12-02 1980-09-02 Tenna Corporation Two-way speaker with transformer-coupled split coil
EP0122990A1 (en) * 1983-04-25 1984-10-31 Tannoy Limited Moving coil loudspeakers
GB2153628A (en) * 1984-01-27 1985-08-21 Tannoy Ltd Moving coil loudspeaker
EP0341926A1 (en) * 1988-05-09 1989-11-15 Kh Technology Corporation Loudspeaker
US5062139A (en) * 1989-06-05 1991-10-29 Christensen Eugene J Coaxial loud speaker system
GB2261135A (en) * 1991-11-02 1993-05-05 Meir Mordechai A loudspeaker
US5418336A (en) * 1990-10-17 1995-05-23 Canon Research Centre Europe Ltd. Sound output device
US5548657A (en) * 1988-05-09 1996-08-20 Kef Audio (Uk) Limited Compound loudspeaker drive unit
GB2360899A (en) * 1999-12-17 2001-10-03 Goodmans Loudspeakers Ltd Coaxial loudspeaker with the magnetic circuit mounted in front of the diaphragm
EP1178701A2 (en) * 2000-08-02 2002-02-06 Fane Acoustics Limited Loudspeaker
GB2386026A (en) * 2002-02-28 2003-09-03 1 Ltd Loudspeaker
GB2427522A (en) * 2005-06-22 2006-12-27 Gp Acoustics Gap seal for a compound drive unit

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4220832A (en) * 1976-12-02 1980-09-02 Tenna Corporation Two-way speaker with transformer-coupled split coil
EP0122990A1 (en) * 1983-04-25 1984-10-31 Tannoy Limited Moving coil loudspeakers
GB2153628A (en) * 1984-01-27 1985-08-21 Tannoy Ltd Moving coil loudspeaker
US5548657A (en) * 1988-05-09 1996-08-20 Kef Audio (Uk) Limited Compound loudspeaker drive unit
GB2236929A (en) * 1988-05-09 1991-04-17 Kef Electronics Ltd Loudspeaker
GB2236929B (en) * 1988-05-09 1992-11-04 Kef Electronics Ltd Loudspeaker
EP0341926A1 (en) * 1988-05-09 1989-11-15 Kh Technology Corporation Loudspeaker
WO1989011201A1 (en) * 1988-05-09 1989-11-16 Kef Electronics Limited Loudspeaker
US5062139A (en) * 1989-06-05 1991-10-29 Christensen Eugene J Coaxial loud speaker system
US5418336A (en) * 1990-10-17 1995-05-23 Canon Research Centre Europe Ltd. Sound output device
GB2261135A (en) * 1991-11-02 1993-05-05 Meir Mordechai A loudspeaker
GB2360899B (en) * 1999-12-17 2002-03-27 Goodmans Loudspeakers Ltd Coaxial speaker
GB2360899A (en) * 1999-12-17 2001-10-03 Goodmans Loudspeakers Ltd Coaxial loudspeaker with the magnetic circuit mounted in front of the diaphragm
EP1178701A2 (en) * 2000-08-02 2002-02-06 Fane Acoustics Limited Loudspeaker
GB2365655A (en) * 2000-08-02 2002-02-20 Fane Acoustics Ltd Loudspeaker with an additional flat diaphragm connected to cone diaphragm
EP1178701A3 (en) * 2000-08-02 2004-11-03 Fane Acoustics Limited Loudspeaker
GB2386026A (en) * 2002-02-28 2003-09-03 1 Ltd Loudspeaker
GB2386026B (en) * 2002-02-28 2005-06-08 1 Ltd Loudspeaker
GB2427522A (en) * 2005-06-22 2006-12-27 Gp Acoustics Gap seal for a compound drive unit
GB2427522B (en) * 2005-06-22 2008-07-16 Gp Acoustics Compound Loudspeaker
US8139784B2 (en) 2005-06-22 2012-03-20 Gp Acoustics (Uk) Limited Compound loudspeaker

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