GB1384716A - Loudspeaker diaphragm - Google Patents

Loudspeaker diaphragm

Info

Publication number
GB1384716A
GB1384716A GB2521672A GB2521672A GB1384716A GB 1384716 A GB1384716 A GB 1384716A GB 2521672 A GB2521672 A GB 2521672A GB 2521672 A GB2521672 A GB 2521672A GB 1384716 A GB1384716 A GB 1384716A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
mould
die
protuberances
moulding
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
GB2521672A
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.)
Sekisui Chemical Co Ltd
Panasonic Holdings Corp
Original Assignee
Sekisui Chemical Co Ltd
Matsushita Electric Industrial 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 claimed from JP4431971U external-priority patent/JPS483028U/ja
Priority claimed from JP4972571U external-priority patent/JPS484488U/ja
Priority claimed from JP6145171A external-priority patent/JPS5140523B1/ja
Application filed by Sekisui Chemical Co Ltd, Matsushita Electric Industrial Co Ltd filed Critical Sekisui Chemical Co Ltd
Publication of GB1384716A publication Critical patent/GB1384716A/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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/122—Non-planar diaphragms or cones comprising a plurality of sections or layers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/122—Non-planar diaphragms or cones comprising a plurality of sections or layers
    • H04R7/125—Non-planar diaphragms or cones comprising a plurality of sections or layers comprising a plurality of superposed layers in contact
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
    • H04R7/20—Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/029—Diaphragms comprising fibres

Landscapes

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

Abstract

1384716 Moulding diaphragms MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd and SEKISUI KAGAKU KOGYO KK 30 May 1972 [28 May 1971 5 July 1971 12 July 1971] 25216/72 Heading B5A [Also in Division H4] A loudspeaker diaphragm of foamed plastics material having spaced regions of density lower than the remainder of the diaphragm is made by placing foamed thermoplastic sheeting in a die and heating the die while pressing the sheeting to frusto conical shape. The die has locally different cooling rates and/or local recesses or protuberances which provide the lower density regions. Alternatively thermosetting material is poured into a mould and the mould is heated while the material is pressed into shape. The mould has locally different cooling rates and/or local recesses or protuberances. An aqueous emulsion of rubber or thermoplastic resin is applied by spraying, brushing or dipping to one or both faces of the diaphragm before or after moulding to form a coating. A peripheral suspension member 22 for the diaphragm is formed by pressing from a sheet of closed cell foam thermoplastics, e.g. E.V.A. copolymer alone or mixed with polyethylene, which has been cross-linked with an organic oxide or by irradiation.
GB2521672A 1971-05-28 1972-05-30 Loudspeaker diaphragm Expired GB1384716A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP4431971U JPS483028U (en) 1971-05-28 1971-05-28
JP4972571U JPS484488U (en) 1971-06-14 1971-06-14
JP6145171A JPS5140523B1 (en) 1970-08-14 1971-07-12

Publications (1)

Publication Number Publication Date
GB1384716A true GB1384716A (en) 1975-02-19

Family

ID=44583528

Family Applications (3)

Application Number Title Priority Date Filing Date
GB4837673A Expired GB1384717A (en) 1971-05-28 1972-05-30 Outer peripheral suspension members for loudspeakers
GB2521672A Expired GB1384716A (en) 1971-05-28 1972-05-30 Loudspeaker diaphragm
GB4837773A Expired GB1384718A (en) 1971-05-28 1972-05-30 Loudspeaker diaphragm

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB4837673A Expired GB1384717A (en) 1971-05-28 1972-05-30 Outer peripheral suspension members for loudspeakers

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB4837773A Expired GB1384718A (en) 1971-05-28 1972-05-30 Loudspeaker diaphragm

Country Status (3)

Country Link
US (1) US3834486A (en)
DE (1) DE2225710C3 (en)
GB (3) GB1384717A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2711996A1 (en) * 1976-03-19 1977-09-29 Hugh Dudley Harwood MEMBRANE FOR A SPEAKER
EP0087177A1 (en) * 1982-02-22 1983-08-31 Koninklijke Philips Electronics N.V. Electro-acoustic transducer having a diaphragm comprising a layer of polymethacrylimide foam
FR2562369A1 (en) * 1984-03-27 1985-10-04 Thomson Csf Method of manufacturing a transducer diaphragm from a polymer material comprising portions with different stiffnesses and diaphragm obtained by this method
GB2176673A (en) * 1985-06-05 1986-12-31 Reefgrade Limited Electro-mechanical transducer diaphragm
FR2665321A1 (en) * 1990-07-23 1992-01-31 Fontaine Pierre PROCESS FOR MANUFACTURING MEMBRANES FOR ELECTRO-MECHANICAL APPLICATIONS, ESPECIALLY FOR ELECTRO-MECHANICAL TRANDUCTORS AND PRODUCT THEREOF.

Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3960106A (en) * 1970-05-14 1976-06-01 Brey Robert J De Particle flow monitor
DE2500397C2 (en) * 1975-01-07 1986-05-28 Schorlemer, Frhr. von, Reinfried, Dipl.-Phys., 3500 Kassel Membrane for an electroacoustic transducer system and an electroacoustic transducer system equipped with it
JPS5278425A (en) * 1975-12-24 1977-07-01 Sanyo Electric Co Ltd Diaphragm for speaker
US4129195A (en) * 1975-12-24 1978-12-12 Sanyo Electric Co., Ltd. Diaphragm for speaker
JPS5379525A (en) * 1976-12-23 1978-07-14 Sony Corp Compound diaphtagm for speakers
JPS5748153Y2 (en) * 1977-11-26 1982-10-22
GB2059717B (en) * 1979-09-25 1984-04-04 Victor Company Of Japan Speaker diaphragm assembly and a method of manufacturing the same
US4445227A (en) * 1981-12-28 1984-04-24 Magnavox Consumer Electronics Company Loudspeaker having improved directional characteristics
GB2144600B (en) * 1983-08-04 1986-09-24 Standard Telephones Cables Ltd Electro acoustic transducer
EP0251057A1 (en) * 1986-06-21 1988-01-07 EWD Electronic-Werke Deutschland GmbH Loudspeaker
DE8712014U1 (en) * 1987-09-04 1987-10-29 Chen, Ding Pang, Taipeh/T'ai-pei Perimeter element for a loudspeaker
US5259036A (en) * 1991-07-22 1993-11-02 Shure Brothers, Inc. Diaphragm for dynamic microphones and methods of manufacturing the same
DE4321506C2 (en) * 1993-06-29 1999-07-29 Ulrich Ranke Loudspeaker diaphragm for a sound generator
CN1122436C (en) * 1994-11-30 2003-09-24 先锋电子股份有限公司 Loudspeaker vibrating diaphragm and methods for its production
FR2734685B1 (en) * 1995-05-23 1997-08-14 Silec Liaisons Elec PIEZOELECTRIC SPEAKER
JP3947321B2 (en) 1999-03-04 2007-07-18 パイオニア株式会社 Foam molded body, molding method thereof and speaker diaphragm using the same
DE19925787C1 (en) * 1999-06-05 2000-12-21 Roehm Gmbh Process for the production of membranes for electroacoustic transducers and membranes
US6724910B1 (en) 1999-10-04 2004-04-20 Harman International Industries, Incorporated Diaphragm stable through hygroscopic cycling
US6351544B1 (en) 1999-12-10 2002-02-26 Harman International Industries Incorporated Regressively hinged spider
JP2002374593A (en) * 2001-06-18 2002-12-26 Pioneer Electronic Corp Speaker diaphragm
DE10135414C1 (en) * 2001-07-25 2003-03-13 Roehm Gmbh Production of non-flat membranes for electroacoustic transducers
US6929091B2 (en) * 2002-10-28 2005-08-16 Sound Advance Systems, Inc. Planar diaphragm loudspeaker and related methods
ATE315880T1 (en) * 2003-09-11 2006-02-15 Akg Acoustics Gmbh DYNAMIC ELECTROACOUSTIC TRANSDUCER, ESPECIALLY SMALL SPEAKER
EP1694094A1 (en) * 2005-02-18 2006-08-23 AKG Acoustics GmbH Membrane for a dynamic converter
JP2008167150A (en) * 2006-12-28 2008-07-17 Matsushita Electric Ind Co Ltd Speaker
EP2271137A1 (en) * 2009-07-03 2011-01-05 DR. KURT MÜLLER GmbH & Co. KG Loudspeaker membrane and method for manufacturing a loudspeaker membrane
JP5665194B2 (en) * 2011-08-19 2015-02-04 株式会社オーディオテクニカ Electroacoustic transducer diaphragm and method of manufacturing the same
USD776086S1 (en) * 2014-04-23 2017-01-10 Martin Audio Limited Loudspeaker
KR102503134B1 (en) * 2015-02-05 2023-02-24 이글 어코스틱스 매뉴팩쳐링, 엘엘씨 Integrated voice coil and cone assembly and method of manufacturing the same
US9769570B2 (en) * 2015-03-31 2017-09-19 Bose Corporation Acoustic diaphragm
JP1549098S (en) * 2015-11-26 2016-05-16

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125647A (en) * 1964-03-17 Frequency-o cycles sec
BE377376A (en) * 1930-02-15
US1990409A (en) * 1932-02-19 1935-02-05 Neville Athol Ernest Acoustical diaphragm
US2146975A (en) * 1936-11-06 1939-02-14 Nagelvoort Adriaan Acoustic diaphragm
USRE24141E (en) * 1952-10-25 1956-04-10 Method of making the same
US2815823A (en) * 1953-03-02 1957-12-10 Rca Corp Loudspeaker structure
US2905260A (en) * 1955-02-24 1959-09-22 Muter Company Loud speaker diaphragm
US3093207A (en) * 1960-10-04 1963-06-11 R T Bozak Mfg Company Metallic diaphragm for electrodynamic loudspeakers
US3153463A (en) * 1961-08-30 1964-10-20 Muter Company Compound loudspeaker diaphragm
US3111189A (en) * 1962-01-12 1963-11-19 Theodore R Scholl Electrodynamic loudspeaker
US3285364A (en) * 1965-06-01 1966-11-15 Ling Temco Vought Inc Loudspeaker construction
AT274080B (en) * 1967-07-05 1969-09-10 Philips Nv Sound transducer with a foam membrane

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2711996A1 (en) * 1976-03-19 1977-09-29 Hugh Dudley Harwood MEMBRANE FOR A SPEAKER
EP0087177A1 (en) * 1982-02-22 1983-08-31 Koninklijke Philips Electronics N.V. Electro-acoustic transducer having a diaphragm comprising a layer of polymethacrylimide foam
US4517416A (en) * 1982-02-22 1985-05-14 U.S. Philips Corporation Electro-acoustic transducer having a diaphragm comprising a layer of polymethacrylimide foam
FR2562369A1 (en) * 1984-03-27 1985-10-04 Thomson Csf Method of manufacturing a transducer diaphragm from a polymer material comprising portions with different stiffnesses and diaphragm obtained by this method
GB2176673A (en) * 1985-06-05 1986-12-31 Reefgrade Limited Electro-mechanical transducer diaphragm
FR2665321A1 (en) * 1990-07-23 1992-01-31 Fontaine Pierre PROCESS FOR MANUFACTURING MEMBRANES FOR ELECTRO-MECHANICAL APPLICATIONS, ESPECIALLY FOR ELECTRO-MECHANICAL TRANDUCTORS AND PRODUCT THEREOF.
WO1992002108A1 (en) * 1990-07-23 1992-02-06 Audax Industries S.A. Method for preparing membranes for acoustic applications in particular for loudspeakers, and membranes obtained by such method
US5380960A (en) * 1990-07-23 1995-01-10 Audax Industries Process for the preparation of films or diaphragms for acoustic applications

Also Published As

Publication number Publication date
GB1384717A (en) 1975-02-19
DE2264881A1 (en) 1975-08-21
DE2264881B2 (en) 1976-10-14
US3834486A (en) 1974-09-10
DE2225710A1 (en) 1972-12-14
DE2225710B2 (en) 1975-04-24
DE2225710C3 (en) 1975-12-04
GB1384718A (en) 1975-02-19

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years