GB311486A - Improvements relating to electro-magnetic acoustic devices for the interconversion of mechanical and electric oscillations, such as loud-speakers - Google Patents

Improvements relating to electro-magnetic acoustic devices for the interconversion of mechanical and electric oscillations, such as loud-speakers

Info

Publication number
GB311486A
GB311486A GB605228A GB605228A GB311486A GB 311486 A GB311486 A GB 311486A GB 605228 A GB605228 A GB 605228A GB 605228 A GB605228 A GB 605228A GB 311486 A GB311486 A GB 311486A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
loud
annular
whilst
interconversion
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
GB605228A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston 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
Priority to BE358497D priority Critical patent/BE358497A/fr
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB605228A priority patent/GB311486A/en
Priority to FR37085D priority patent/FR37085E/en
Priority to DEA56952D priority patent/DE547915C/en
Publication of GB311486A publication Critical patent/GB311486A/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

Abstract

311,486. British Thomson-Houston Co., Ltd., and Parry, R. D. Feb. 27, 1928. Diaphragms; magnetic instruments.-A conetype loud-speaker &c. comprises one or more coaxial circular flexible divisions dividing its diaphragm into two or more contiguous and preferably dfferent-sized portions, each of which is provided with separate operating means. The diaphragm may be in the form of a dish, cap of a sphere, cone or truncated cone, whilst the operating means may be reeds or other known types of armature devices, annular coils, closed rings of conducting material or annular magnetic members. The Figure shows a moving coil arrangement in which the diaphragm 1 is divided into two unequal portions 2, 3, the portion 2 being flexibly supported at 4 to a casing 5 whilst the portion 3 is flexibly supported at 6 to the portion 2. Each portion is positively actuated by coils 7, 8 located in the annular air gaps 10, 11 of a magnet structure 9. The co-operating pole pieces forming the air gaps are of opposite polarity. By splitting up the diaphragm into two unequal portions, one portion can be arranged to produce the high frequency and the other the low frequency vibrations. The Provisional Specification refers to a split disc diaphragm.
GB605228A 1925-01-09 1928-02-27 Improvements relating to electro-magnetic acoustic devices for the interconversion of mechanical and electric oscillations, such as loud-speakers Expired GB311486A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE358497D BE358497A (en) 1925-01-09
GB605228A GB311486A (en) 1928-02-27 1928-02-27 Improvements relating to electro-magnetic acoustic devices for the interconversion of mechanical and electric oscillations, such as loud-speakers
FR37085D FR37085E (en) 1925-01-09 1929-02-19 Improvements to sound-producing devices
DEA56952D DE547915C (en) 1928-02-27 1929-02-28 Conical membrane consisting of several zones of different sizes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB605228A GB311486A (en) 1928-02-27 1928-02-27 Improvements relating to electro-magnetic acoustic devices for the interconversion of mechanical and electric oscillations, such as loud-speakers

Publications (1)

Publication Number Publication Date
GB311486A true GB311486A (en) 1929-05-16

Family

ID=9807530

Family Applications (1)

Application Number Title Priority Date Filing Date
GB605228A Expired GB311486A (en) 1925-01-09 1928-02-27 Improvements relating to electro-magnetic acoustic devices for the interconversion of mechanical and electric oscillations, such as loud-speakers

Country Status (2)

Country Link
DE (1) DE547915C (en)
GB (1) GB311486A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0242856A2 (en) * 1986-04-21 1987-10-28 Thomas Deuble Coaxial loud speaker
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
WO2016046075A1 (en) * 2014-09-22 2016-03-31 Sennheiser Electronic Gmbh & Co. Kg Electrodynamic sound transducer
EP3041263A3 (en) * 2014-12-30 2016-09-28 Sonion Nederland B.V. Hybrid receiver module
FR3049149A1 (en) * 2016-03-17 2017-09-22 Cabasse SPEAKER AND METHOD FOR MANUFACTURING LOUDSPEAKER
FR3049148A1 (en) * 2016-03-17 2017-09-22 Cabasse PROCESS FOR MANUFACTURING COXIAL MEMBRANES FOR A SPEAKER
WO2021194339A1 (en) * 2020-03-25 2021-09-30 Lorentz Audio B.V. Electroacoustic transducer and loudspeaker, microphone and electronic device comprising said electroacoustic transducer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4105067A1 (en) * 1991-02-19 1991-12-12 Kraemer Rudolf Magnet for electrodynamic transducer i.e. loudspeaker - has cylindrical magnetic core surrounded by second magnet and opposite magnetic poles

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0242856A2 (en) * 1986-04-21 1987-10-28 Thomas Deuble Coaxial loud speaker
EP0242856A3 (en) * 1986-04-21 1989-03-15 Thomas Deuble Coaxial loud speaker
GB2386026A (en) * 2002-02-28 2003-09-03 1 Ltd Loudspeaker
GB2386026B (en) * 2002-02-28 2005-06-08 1 Ltd Loudspeaker
US8139784B2 (en) 2005-06-22 2012-03-20 Gp Acoustics (Uk) Limited Compound loudspeaker
GB2427522B (en) * 2005-06-22 2008-07-16 Gp Acoustics Compound Loudspeaker
GB2427522A (en) * 2005-06-22 2006-12-27 Gp Acoustics Gap seal for a compound drive unit
WO2016046075A1 (en) * 2014-09-22 2016-03-31 Sennheiser Electronic Gmbh & Co. Kg Electrodynamic sound transducer
US10194247B2 (en) 2014-09-22 2019-01-29 Sennheiser Electronic Gmbh & Co. Kg Electrodynamic sound transducer
EP3041263A3 (en) * 2014-12-30 2016-09-28 Sonion Nederland B.V. Hybrid receiver module
US9729974B2 (en) 2014-12-30 2017-08-08 Sonion Nederland B.V. Hybrid receiver module
FR3049149A1 (en) * 2016-03-17 2017-09-22 Cabasse SPEAKER AND METHOD FOR MANUFACTURING LOUDSPEAKER
FR3049148A1 (en) * 2016-03-17 2017-09-22 Cabasse PROCESS FOR MANUFACTURING COXIAL MEMBRANES FOR A SPEAKER
WO2021194339A1 (en) * 2020-03-25 2021-09-30 Lorentz Audio B.V. Electroacoustic transducer and loudspeaker, microphone and electronic device comprising said electroacoustic transducer

Also Published As

Publication number Publication date
DE547915C (en) 1932-03-30

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