EP0492914A2 - Lautsprecherkonus und Randringanordnung - Google Patents

Lautsprecherkonus und Randringanordnung Download PDF

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Publication number
EP0492914A2
EP0492914A2 EP91311619A EP91311619A EP0492914A2 EP 0492914 A2 EP0492914 A2 EP 0492914A2 EP 91311619 A EP91311619 A EP 91311619A EP 91311619 A EP91311619 A EP 91311619A EP 0492914 A2 EP0492914 A2 EP 0492914A2
Authority
EP
European Patent Office
Prior art keywords
surround
cone
loudspeaker
injection moulding
assembly
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.)
Withdrawn
Application number
EP91311619A
Other languages
English (en)
French (fr)
Other versions
EP0492914A3 (en
Inventor
Patrick Arthur T.T. Plastics Leach
David Ian T.T. Plastics Leach
Marshall Terence Robin Nigel Collinson
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.)
TGI PLC
Original Assignee
TGI 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
Priority claimed from GB909027670A external-priority patent/GB9027670D0/en
Priority claimed from GB919105149A external-priority patent/GB9105149D0/en
Priority claimed from GB919120591A external-priority patent/GB9120591D0/en
Application filed by TGI PLC filed Critical TGI PLC
Publication of EP0492914A2 publication Critical patent/EP0492914A2/de
Publication of EP0492914A3 publication Critical patent/EP0492914A3/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H04R7/16—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
    • 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
    • H04R2307/204—Material aspects of the outer suspension of loudspeaker diaphragms

Definitions

  • the invention relates to loudspeakers and more particularly to drive units for loudspeakers.
  • the most basic loudspeaker cone is formed about its periphery with a corrugation which forms a suspension or surround by which the cone is able to move under the influence of its drive means which is usually a moving coil motor.
  • More advanced speaker cones are provided with a peripheral suspension in the form of a corrugated member of flexible rubber or other elastomeric material and which is sometimes known as a roll surround.
  • Such elastomeric suspensions are normally compression moulded from thermosetting elastomeric materials and are secured to the material of the cone with the aid of an adhesive. This requires skilled hand assembly to ensure concentricity and a reliable bond and is thus slow and expensive. This form of assembly is however usually justified by the improved acoustic performance which results from the provision of a compliant suspension for the cone.
  • cone will be used to describe any kind of air moving device whether flat or conical or of other shape and whether or not it is driven by a moving coil or other mechanism.
  • a loudspeaker cone and surround assembly wherein the surround is an injection moulding formed directly onto the cone.
  • the invention is a loudspeaker cone and surround assembly wherein the cone is an injection moulding formed directly onto the surround.
  • the cross-sectional thickness of the cone can be tailored as desired, e.g from relatively thick near the centre to relatively thin near its margin.
  • the cone is of a plastics material and the surround is of an elastomer.
  • both cone and surround are injection moulded.
  • the cone comprises a polypropylene polymer and the surround comprises a styrene-ethylene butylene-styrene polymer.
  • a paper or the like gasket may be directly moulded onto the surround when the surround is made.
  • the paper gasket can be placed in the mould before the elastomer is injected to form the surround.
  • the junction between the material of the cone and the material of the surround preferably comprises an overlapping portion to lend strength to the joint.
  • the material of the surround can overlap both sides of the outer peripheral margin of the cone.
  • the overlap is invisible, in which case it can be situated only on the rear surface of the cone.
  • the junction between the cone and the surround is situated close to the edge of the active portion of the surround, that is to say the portion designed to move in use, so that the material of the surround does not form part of the air driving activity of the cone since this might adversely influence the acoustic characteristics of the cone.
  • the invention is a method of making a loudspeaker cone and flexible surround assembly comprising arranging a cone in the mould cavity of an injection moulding apparatus and injection moulding a surround material onto the periphery of the cone under heat and pressure to form a surround or suspension which is chemically bonded to the material of the cone.
  • the cone comprises polypropylene and is injection moulded and preferably the surround comprises an elastomeric material.
  • the invention is a method of making a loudspeaker cone and flexible surround assembly comprising arranging a surround in a mould cavity of an injection moulding apparatus and injection moulding a cone material onto the surround under heat and pressure to form a cone which is chemically bonded to the material of the surround.
  • the cone comprises polypropylene and preferably the surround comprises an elastomeric material and is injection moulded.
  • One method of making the loudspeaker cone and flexible surround assembly comprises injection moulding a polypropylene cone in a first cavity in an injection moulding machine and thereafter altering the shape of the cavity to define a peripheral surround cavity into which the peripheral edge of the cone extends and injection moulding an elastomer into the surround cavity whereby it chemically bonds to the edge of the cone.
  • the cone can be moulded first in one mould cavity and then transferred to another mould cavity in which the surround is injection moulded onto the cone.
  • the polypropylene used for the cone may be a homopolymer or co-polymer and may comprise a proportion of a filler such as mica.
  • the plastic material will have a high melt flow index to allow the material to be moulded in a cavity having a thin section.
  • the elastomer of the suspension is preferably a styrene-ethylene butylene-styrene polymer such as that sold by Evode Plastics Limited under their registered trademark Evoprene G.
  • the elastomer has a shore A hardness below 40.
  • a preferred injection moulding apparatus will have two injection units and barrels one of which injects the material of the cone into the mould cavity and the other of which injects the material of the suspension into the mould cavity.
  • the cone could be moulded from other plastics such as ABS, polystyrene, PVC, nylon or polyethylene or any other rigid polymer.
  • the surround is preferably of styreneethylene butylene-styrene but could be of flexible PVC or of a thermoplastic rubber alloy compound.
  • a loudspeaker drive cone and surround assembly of generally conventional appearance and comprising a frusto-conical drive cone 1 which, in use, is attached at its inner margin 11 in any convenient manner to a loudspeaker drive motor, e.g. a moving coil, not shown, the outer margin 3 of the cone 1 being attached to a compliant surround or suspension 2 which in turn is secured in any convenient fashion to a loudspeaker drive unit chassis (not shown).
  • the peripheral margin 3 of the loudspeaker drive cone 1 has been injection moulded from polypropylene and the flexible elastomeric surround or suspension 2, which is of generally conventional configuration, has been injection moulded thereon.
  • the surround is annular in shape and comprises an outer flange 5 by which it is attached to the loudspeaker drive unit chassis (not shown), a part circular roll or bellows 6 which is the active part of the cone suspension and an inner flange 7, which is moulded onto the rear face 9 of the cone 1 so as to overlap the outer margin 3 of the cone to some extent.
  • the overlapping join is thus invisible in use.
  • the outer edge 8 of the cone 1 is preferably positioned closely adjacent to the roll or bellows 6 of the surround 2 so that the surround does not adversely affect the acoustic properties of the cone.
  • the material of the surround 2 is a styrene-ethylene butylene-styrene which bonds chemically under the heat and pressure of the injection moulding process to the polypropylene cone to form an integral unit therewith, thereby obviating the need to glue the cone and surround together as has been necessary heretofore. In this way the alignment between the cone and surround can be controlled more predictably than is the case with hand assembly, and the connection between the cone and surround can be achieved consistently.
  • a paper gasket 10 is arranged in the mould prior to the injection moulding of the surround 2, whereby the gasket 10 is bonded to the flange 5.
  • the cone and surround unit can be secured to the chassis (not shown) of a drive unit using conventional, that is, non-harmful, adhesives.
  • the invention thus provides a novel drive cone and surround assembly which can be manufactured more efficiently than was previously the case.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Manufacturing & Machinery (AREA)
  • Multimedia (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
EP19910311619 1990-12-20 1991-12-13 Loudspeaker cone and surround assembly Withdrawn EP0492914A3 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
GB909027670A GB9027670D0 (en) 1990-12-20 1990-12-20 Loudspeakers
GB9027670 1990-12-20
GB9105149 1991-03-12
GB919105149A GB9105149D0 (en) 1991-03-12 1991-03-12 Loudspeakers
GB9120591 1991-09-27
GB919120591A GB9120591D0 (en) 1991-09-27 1991-09-27 Loudspeakers

Publications (2)

Publication Number Publication Date
EP0492914A2 true EP0492914A2 (de) 1992-07-01
EP0492914A3 EP0492914A3 (en) 1992-10-21

Family

ID=27265415

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910311619 Withdrawn EP0492914A3 (en) 1990-12-20 1991-12-13 Loudspeaker cone and surround assembly

Country Status (2)

Country Link
EP (1) EP0492914A3 (de)
JP (1) JPH077791A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0627868A1 (de) * 1993-05-28 1994-12-07 Bose Corporation Antriebssystem-Randring für Lautsprecher
EP0632674A1 (de) * 1993-06-28 1995-01-04 Sony Corporation Membran zur Verwendung mit einem elektroakustischen Wandler und Verfahren zu ihrer Herstellung
WO1998002016A2 (en) * 1996-07-09 1998-01-15 B & W Loudspeakers Limited Loudspeaker drive unit
GB2327903A (en) * 1997-10-14 1999-02-10 Kurt Mueller A speaker cone and a method of manufacture thereof
WO2000032010A2 (en) * 1998-11-24 2000-06-02 B & W Loudspeakers Limited Auxiliary bass radiator units
US6252633B1 (en) * 1997-07-03 2001-06-26 U.S. Philips Corporation Television signal receiver
CN109391861A (zh) * 2018-10-26 2019-02-26 河南朗博校准检测有限公司 一种基于声学的传声器
CN113676821A (zh) * 2021-07-20 2021-11-19 伸锦电子(上海)有限公司 一种复合音盆及其生产工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4484312B2 (ja) * 2000-05-01 2010-06-16 株式会社デンソー 硬質の成形樹脂部と軟質部材部とよりなる樹脂成形品

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2056817A (en) * 1979-09-10 1981-03-18 Semperit Ag A loudspeaker membrane
GB1604934A (en) * 1978-05-30 1981-12-16 Mordaunt Short Ltd Loudspeaker cone terminations and their formation
JPS58201496A (ja) * 1982-05-20 1983-11-24 Sanyo Electric Co Ltd スピ−カ用振動板の製造方法
DE3241757A1 (de) * 1982-11-11 1984-05-17 Elektrotechnik Ehmann Gmbh, 6953 Gundelsheim Schwingeinsatz fuer einen elektromechanischen wandler und verfahren zu dessen herstellung
WO1990003710A1 (de) * 1988-09-20 1990-04-05 Nokia Unterhaltungselektronik (Deutschland) Gmbh Membran mit sicke
GB2228391A (en) * 1989-02-10 1990-08-22 Pioneer Electronic Corp Metal mold for loudspeaker diaphragm

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1604934A (en) * 1978-05-30 1981-12-16 Mordaunt Short Ltd Loudspeaker cone terminations and their formation
GB2056817A (en) * 1979-09-10 1981-03-18 Semperit Ag A loudspeaker membrane
JPS58201496A (ja) * 1982-05-20 1983-11-24 Sanyo Electric Co Ltd スピ−カ用振動板の製造方法
DE3241757A1 (de) * 1982-11-11 1984-05-17 Elektrotechnik Ehmann Gmbh, 6953 Gundelsheim Schwingeinsatz fuer einen elektromechanischen wandler und verfahren zu dessen herstellung
WO1990003710A1 (de) * 1988-09-20 1990-04-05 Nokia Unterhaltungselektronik (Deutschland) Gmbh Membran mit sicke
GB2228391A (en) * 1989-02-10 1990-08-22 Pioneer Electronic Corp Metal mold for loudspeaker diaphragm

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 8, no. 49 (E-230)6 March 1984 & JP-A-58 201 496 ( SANYO DENKI KK ) *

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0627868A1 (de) * 1993-05-28 1994-12-07 Bose Corporation Antriebssystem-Randring für Lautsprecher
US5418337A (en) * 1993-05-28 1995-05-23 Bose Corporation Loudspeaker driver surrounding
EP0632674A1 (de) * 1993-06-28 1995-01-04 Sony Corporation Membran zur Verwendung mit einem elektroakustischen Wandler und Verfahren zu ihrer Herstellung
US5521886A (en) * 1993-06-28 1996-05-28 Sony Corporation Diaphragm for use with an electro-acoustic transducer and method of producing the same
CN1071986C (zh) * 1993-06-28 2001-09-26 索尼公司 电声转换器用的膜片及其制作方法
US6219432B1 (en) 1996-07-09 2001-04-17 B&W Loudspeakers Limited Loudspeaker drive unit
WO1998002016A3 (en) * 1996-07-09 1998-05-14 B & W Loudspeakers Loudspeaker drive unit
WO1998002016A2 (en) * 1996-07-09 1998-01-15 B & W Loudspeakers Limited Loudspeaker drive unit
US6252633B1 (en) * 1997-07-03 2001-06-26 U.S. Philips Corporation Television signal receiver
GB2327903B (en) * 1997-10-14 2000-01-12 Kurt Mueller Speaker cone
GB2327903A (en) * 1997-10-14 1999-02-10 Kurt Mueller A speaker cone and a method of manufacture thereof
GB2328177B (en) * 1997-10-14 2000-01-12 Kurt Mueller Speaker cone
GB2328177A (en) * 1997-10-14 1999-02-17 Kurt Mueller Injection moulding an elastomeric surround to a speaker cone
WO2000032010A2 (en) * 1998-11-24 2000-06-02 B & W Loudspeakers Limited Auxiliary bass radiator units
WO2000032010A3 (en) * 1998-11-24 2000-07-27 B & W Loudspeakers Auxiliary bass radiator units
US6396936B1 (en) 1998-11-24 2002-05-28 B&W Loudspeaker Limited Auxiliary bass radiator units
CN109391861A (zh) * 2018-10-26 2019-02-26 河南朗博校准检测有限公司 一种基于声学的传声器
CN113676821A (zh) * 2021-07-20 2021-11-19 伸锦电子(上海)有限公司 一种复合音盆及其生产工艺
CN113676821B (zh) * 2021-07-20 2024-03-15 伸锦电子(上海)有限公司 一种复合音盆及其生产工艺

Also Published As

Publication number Publication date
JPH077791A (ja) 1995-01-10
EP0492914A3 (en) 1992-10-21

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