GB986390A - An electro-acoustic transducer - Google Patents

An electro-acoustic transducer

Info

Publication number
GB986390A
GB986390A GB22725/61A GB2272561A GB986390A GB 986390 A GB986390 A GB 986390A GB 22725/61 A GB22725/61 A GB 22725/61A GB 2272561 A GB2272561 A GB 2272561A GB 986390 A GB986390 A GB 986390A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
less
diaphragms
glued
magnets
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
GB22725/61A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB986390A publication Critical patent/GB986390A/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
    • H04R9/06—Loudspeakers
    • H04R9/063—Loudspeakers using a plurality of acoustic drivers
    • 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
    • H04R9/046—Construction
    • H04R9/047—Construction in which the windings of the moving coil lay in the same plane

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

986,390. Electrodynamic transducers; diaphragms. G. R. POUTOT. June 22, 1961 [June 23, 1960], No. 22725/61. Heading H4J. A rigid diaphragm for a loud-speaker or microphone has, a specific gravity of less than 0À1, one plane side and on its opposite side at least one protrusion which carries a conductive member disposed in a magnetic field. The diaphragm 1a consists of a foamed polystyrene rectangular sheet (specific gravity less than 0À02) of dimensions 120 x 80 x 6 mm. and it has a number of parallel grooves 14 formed in one face thereof. An aluminium wire 2a or ribbon (Fig. 3, not shown) is glued to the projecting ribs 15 so as to form a number of rectangular loops (Fig. 11, not shown). The magnet system comprises a number of sheet-metal laminations 22, 23 of high permeability which are glued to plates 24 of a magnetic ferrite material, the individual " magnets " so formed being retained in a framework 18a, 18b, 25a, 25b. The diaphragm la is positioned and supported above the magnets by flexible strips 12a, 13a of foamed P.V.C. or polyurethane. Stranded leads 16 connect insulated terminals 20a, 20b to the coil (2a). The use of triangular shaped and trapezoidal diaphragms is discussed with reference to Figs. 4, 5 and 8, 10 respectively (not shown) and a number of conventional circular coils are used on a diaphragm described with reference to Figs. 13 and 14. It should be noted that for any free point on the plane side of the diaphragm a cone can be drawn with its vertex at the junction of a protrusion and the main portion of the diaphragm, with its axis at right angles to the plane of the diaphragm and with a vertex angle of less than 100 degrees such that the free point lies within the cone.
GB22725/61A 1960-06-23 1961-06-22 An electro-acoustic transducer Expired GB986390A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR830847A FR1269138A (en) 1960-06-23 1960-06-23 Improvements to loudspeakers, microphones, and similar electrodynamic devices

Publications (1)

Publication Number Publication Date
GB986390A true GB986390A (en) 1965-03-17

Family

ID=8734012

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22725/61A Expired GB986390A (en) 1960-06-23 1961-06-22 An electro-acoustic transducer

Country Status (4)

Country Link
US (1) US3171904A (en)
DE (2) DE1195356B (en)
FR (2) FR1269138A (en)
GB (1) GB986390A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2347818A (en) * 1999-03-10 2000-09-13 Steff Lin Flat type loud speaker
ES2376731A1 (en) * 2010-06-07 2012-03-16 ACÚSTICA BEYMA, S.L. Speaker of diaphragm folded. (Machine-translation by Google Translate, not legally binding)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1269138A (en) * 1960-06-23 1961-08-11 Improvements to loudspeakers, microphones, and similar electrodynamic devices
SU581598A1 (en) * 1974-12-17 1977-11-25 Kasatkin Aleksej F Band loudspeaker
US4210786A (en) * 1979-01-24 1980-07-01 Magnepan, Incorporated Magnetic field structure for planar speaker
FR2450020A1 (en) * 1979-02-20 1980-09-19 Soria Jean Yves Loudspeaker with several electrodynamic driving units - which fit over membrane to apply uniform force to latter
FR2477821A1 (en) * 1980-03-06 1981-09-11 3A Art Acoustique Appliquee Sa ELECTRODYNAMIC SPEAKER
FR2477824A1 (en) * 1980-03-07 1981-09-11 Spiteri Ernest IMPROVEMENTS IN ELECTRODYNAMIC LOUDSPEAKERS WITH EXPANDED POLYSTYRENE FLAT MEMBRANE
US4468530A (en) * 1982-01-25 1984-08-28 Torgeson W Lee Loudspeaker system
US4491698A (en) * 1982-06-17 1985-01-01 David A. Larson Electro-acoustic transducer with diaphragm and blank therefor
US4703510A (en) * 1982-06-17 1987-10-27 Larson David A Electro-acoustic transducer with diaphragm and blank therefor
US4536623A (en) * 1983-06-16 1985-08-20 Larson David A Electro-acoustic transducer with diaphragm and blank therefor
US4604792A (en) * 1984-12-20 1986-08-12 Lff & Associates Method for making electro-acoustic transducer apparatus

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE484339C (en) * 1929-10-15 Lorenz Akt Ges C Electrodynamic telephone, especially for loudspeakers
DE447620C (en) * 1927-08-06 Siemens & Halske Akt Ges Electrodynamic telephone
GB160223A (en) * 1919-11-18 1921-03-18 Adrian Francis Sykes Improvements in telephonic and like apparatus
NL15444C (en) * 1923-06-08
DE456570C (en) * 1926-04-02 1928-02-21 Siemens & Halske Akt Ges Electrodynamic telephone
CH133508A (en) * 1927-03-12 1929-06-15 Siemens Ag Membrane.
DE500723C (en) * 1928-11-13 1930-06-24 Siemens & Halske Akt Ges Electrodynamic telephone with a rust-shaped magnet system
US1987412A (en) * 1931-05-12 1935-01-08 Siemens Ag Acoustic apparatus
US2297218A (en) * 1937-04-24 1942-09-29 Hans E Henrich Loud-speaker
US2978671A (en) * 1951-08-11 1961-04-04 Harris Transducer Corp Electrodynamic transducer
US2978669A (en) * 1954-03-08 1961-04-04 Harris Transducer Corp Underwater electrodynamic acoustic transducer with air-filled composite diaphragm
FR1169701A (en) * 1957-03-15 1959-01-05 Ct D Etudes Et De Dev De L Ele Electromagnetic device, especially for microphones and headphones
NL112193C (en) * 1958-03-07
US3111187A (en) * 1959-11-23 1963-11-19 H J Leak & Company Ltd Diaphragm for electro acoustic transducer
FR1269138A (en) * 1960-06-23 1961-08-11 Improvements to loudspeakers, microphones, and similar electrodynamic devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2347818A (en) * 1999-03-10 2000-09-13 Steff Lin Flat type loud speaker
ES2376731A1 (en) * 2010-06-07 2012-03-16 ACÚSTICA BEYMA, S.L. Speaker of diaphragm folded. (Machine-translation by Google Translate, not legally binding)

Also Published As

Publication number Publication date
FR1269138A (en) 1961-08-11
FR87555E (en) 1966-01-07
DE1259948B (en) 1968-02-01
US3171904A (en) 1965-03-02
DE1195356B (en) 1965-06-24

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