GB767309A - Improvements in or relating to moving coil type loudspeakers - Google Patents

Improvements in or relating to moving coil type loudspeakers

Info

Publication number
GB767309A
GB767309A GB6547/54A GB654754A GB767309A GB 767309 A GB767309 A GB 767309A GB 6547/54 A GB6547/54 A GB 6547/54A GB 654754 A GB654754 A GB 654754A GB 767309 A GB767309 A GB 767309A
Authority
GB
United Kingdom
Prior art keywords
pole
ferrous
loud
secured
permanent magnet
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
GB6547/54A
Inventor
John George Carter
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.)
GOODMANS IND Ltd
Original Assignee
GOODMANS IND 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
Priority to NL102625D priority Critical patent/NL102625C/xx
Priority to BE536113D priority patent/BE536113A/xx
Priority to NL195295D priority patent/NL195295A/xx
Application filed by GOODMANS IND Ltd filed Critical GOODMANS IND Ltd
Priority to GB6547/54A priority patent/GB767309A/en
Priority to US491145A priority patent/US2818471A/en
Priority to FR1119908D priority patent/FR1119908A/en
Priority to DEG16616A priority patent/DE1002396B/en
Publication of GB767309A publication Critical patent/GB767309A/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
    • 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

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)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

767,309. Loud-speakers. GOODMANS INDUSTRIES, Ltd. Feb. 22, 1955 [March 5, 1954], No. 6547/54. Class 40 (4). In a loud-speaker having separate coaxial moving coil systems for high and low frequency reproduction, the central pole-piece 2b which with an annular front plate 3 forms a first air gap 4 has provided at its front end an auxiliary pole element 2c of smaller diameter which with a supplementary pole plate 8 defines a second air gap 9 located in the same magnetic circuit. Pole tip 2b and permanent magnet 2a are secured in the casing by bolt 5 and the supplementary pole plate 8 is supported on a non- ferrous locating ring 7 or on non-ferrous distance pieces in an annular groove or recess 6. A domed high-frequency diaphragm 14 is clamped around its periphery between a pair of washers 17 and is enclosed by a perforated cover 15. A small acoustic horn 20 may be provided and the whole of the high-frequency unit may be secured to the pole-piece 2b by non-ferrous bolts 18. A ring-type permanent magnet may be used or the assembly may be mains energized.
GB6547/54A 1954-03-05 1954-03-05 Improvements in or relating to moving coil type loudspeakers Expired GB767309A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
NL102625D NL102625C (en) 1954-03-05
BE536113D BE536113A (en) 1954-03-05
NL195295D NL195295A (en) 1954-03-05
GB6547/54A GB767309A (en) 1954-03-05 1954-03-05 Improvements in or relating to moving coil type loudspeakers
US491145A US2818471A (en) 1954-03-05 1955-02-28 Moving coil type loudspeakers
FR1119908D FR1119908A (en) 1954-03-05 1955-03-01 Electro-dynamic speaker
DEG16616A DE1002396B (en) 1954-03-05 1955-03-03 Coaxial loudspeaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6547/54A GB767309A (en) 1954-03-05 1954-03-05 Improvements in or relating to moving coil type loudspeakers

Publications (1)

Publication Number Publication Date
GB767309A true GB767309A (en) 1957-01-30

Family

ID=9816486

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6547/54A Expired GB767309A (en) 1954-03-05 1954-03-05 Improvements in or relating to moving coil type loudspeakers

Country Status (6)

Country Link
US (1) US2818471A (en)
BE (1) BE536113A (en)
DE (1) DE1002396B (en)
FR (1) FR1119908A (en)
GB (1) GB767309A (en)
NL (2) NL102625C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2153628A (en) * 1984-01-27 1985-08-21 Tannoy Ltd Moving coil loudspeaker
GB2261135A (en) * 1991-11-02 1993-05-05 Meir Mordechai A loudspeaker

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB445935A (en) * 1934-10-17 1936-04-17 Alfred Sidney Evans An improved sound reproducing device
US2699472A (en) * 1950-07-21 1955-01-11 Rca Corp Coaxial, dual unit, electrodynamic loud-speaker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2153628A (en) * 1984-01-27 1985-08-21 Tannoy Ltd Moving coil loudspeaker
GB2261135A (en) * 1991-11-02 1993-05-05 Meir Mordechai A loudspeaker

Also Published As

Publication number Publication date
DE1002396B (en) 1957-02-14
NL102625C (en)
FR1119908A (en) 1956-06-27
BE536113A (en)
US2818471A (en) 1957-12-31
NL195295A (en)

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