GB336084A - Improvements in or relating to loud speaking telephones - Google Patents

Improvements in or relating to loud speaking telephones

Info

Publication number
GB336084A
GB336084A GB2948429A GB2948429A GB336084A GB 336084 A GB336084 A GB 336084A GB 2948429 A GB2948429 A GB 2948429A GB 2948429 A GB2948429 A GB 2948429A GB 336084 A GB336084 A GB 336084A
Authority
GB
United Kingdom
Prior art keywords
coil
ring
screws
support
diaphragm
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
GB2948429A
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.)
NEVILLE JAMES MCAINSH
General Electric Co PLC
Original Assignee
NEVILLE JAMES MCAINSH
General Electric Co PLC
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 NEVILLE JAMES MCAINSH, General Electric Co PLC filed Critical NEVILLE JAMES MCAINSH
Priority to GB2948429A priority Critical patent/GB336084A/en
Publication of GB336084A publication Critical patent/GB336084A/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
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/041—Centering

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

336,084. General Electric Co., Ltd., Clark, F., and McAinsh, N. J. Sept. 30, 1929. Loud-speakers; magnetic instruments. - A moving coil loud-speaker has the coil former and centring device for the coil formed in one piece. In the construction shown, the frusto-conical diaphragm 8 is actuated by a coil 7 situated in the air gap of a pot magnet comprising a central core 1, end plates 4, 5 and shell 6. The diaphragm is flexibly mounted in a frame 9 which is fixed to the magnet assembly by screws 10, the fixing holes in the frame being slightly larger than the screws to provide for adjustment. The combined coil support and centring device 11, which may be of aluminium or an alloy thereof, consists of a cylindrical part on which the coil is wound, a tapering portion to which the diaphragm is secured by rivets 12 and ring 13, a flat part comprising arms 14 and an outer ring which is secured to support 9 by screws 15 and ring 16. A washer 17 is provided between device 11 and ring 16 and washers 18, 19 between device 11 and support 9, the leading-out wires from the coil, one of which is shown at 20, Fig. 2, passing between the washers 18, 19.
GB2948429A 1929-09-30 1929-09-30 Improvements in or relating to loud speaking telephones Expired GB336084A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2948429A GB336084A (en) 1929-09-30 1929-09-30 Improvements in or relating to loud speaking telephones

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2948429A GB336084A (en) 1929-09-30 1929-09-30 Improvements in or relating to loud speaking telephones

Publications (1)

Publication Number Publication Date
GB336084A true GB336084A (en) 1930-10-09

Family

ID=10292268

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2948429A Expired GB336084A (en) 1929-09-30 1929-09-30 Improvements in or relating to loud speaking telephones

Country Status (1)

Country Link
GB (1) GB336084A (en)

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