EP0944292A3 - Loadspeaker diaphram of an injection foam molded body - Google Patents

Loadspeaker diaphram of an injection foam molded body Download PDF

Info

Publication number
EP0944292A3
EP0944292A3 EP99105479A EP99105479A EP0944292A3 EP 0944292 A3 EP0944292 A3 EP 0944292A3 EP 99105479 A EP99105479 A EP 99105479A EP 99105479 A EP99105479 A EP 99105479A EP 0944292 A3 EP0944292 A3 EP 0944292A3
Authority
EP
European Patent Office
Prior art keywords
resin mixture
mixture material
mold
injection
skin layers
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Withdrawn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
EP99105479A
Other languages
German (de)
French (fr)
Other versions
EP0944292A2 (en
Inventor
Masatoshi c/oTOHOKU PIONEER ELECTRONIC CORP. Sato
Kunio c/oTOHOKU PIONEER ELECTRONIC CORP. Mitobe
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.)
Tohoku Pioneer Corp
Pioneer Corp
Original Assignee
Tohoku Pioneer Electronic Corp
Pioneer Electronic Corp
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 Tohoku Pioneer Electronic Corp, Pioneer Electronic Corp filed Critical Tohoku Pioneer Electronic Corp
Publication of EP0944292A2 publication Critical patent/EP0944292A2/en
Publication of EP0944292A3 publication Critical patent/EP0944292A3/en
Withdrawn legal-status Critical Current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
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising 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
    • 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
    • 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)
  • Manufacturing & Machinery (AREA)
  • Multimedia (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

An inorganic or organic filler in an amount of 3 to 30 % by weight is added to a resin containing a foaming agent. The resulting resin mixture material is injection molded into a loudspeaker diaphragm (1) having a three-layer structure in which a foamed layer (3) is covered with unfoamed skin layers (2). For forming the three-layer structure, a resin mixture material of polypropylene containing a foaming agent is injected into a cavity of a mold (20). Immediately after the injection and the completion of forming the skin layers (2), the mold (20) is separated so that the material may start foaming at its inside to form the foamed layer (3). Since the surfaces of the resin mixture material are in contact with the inner surfaces of the mold in the injection, the surfaces of the resin mixture material have solidified before the foaming takes place, so as to form the unfoamed skin layers (2). By adjusting the filler to the appropriate content, the loudspeaker diaphragm (1) is improved in appearance quality while keeping the other physical properties with favourable characteristics.
EP99105479A 1998-03-19 1999-03-17 Loadspeaker diaphram of an injection foam molded body Withdrawn EP0944292A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP07101198A JP3602327B2 (en) 1998-03-19 1998-03-19 Speaker diaphragm by injection foam molding
JP7101198 1998-03-19

Publications (2)

Publication Number Publication Date
EP0944292A2 EP0944292A2 (en) 1999-09-22
EP0944292A3 true EP0944292A3 (en) 2005-03-02

Family

ID=13448145

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99105479A Withdrawn EP0944292A3 (en) 1998-03-19 1999-03-17 Loadspeaker diaphram of an injection foam molded body

Country Status (2)

Country Link
EP (1) EP0944292A3 (en)
JP (1) JP3602327B2 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9925595D0 (en) * 1999-10-28 1999-12-29 Goodmans Loudspeakers Limited Loudspeaker
US6480563B2 (en) 2000-12-19 2002-11-12 Ge Medical Systems Global Technology Co., Llc System and method of aligning scintillator crystalline structures for computed tomography imaging
JP2003037891A (en) 2001-07-23 2003-02-07 Daicel Chem Ind Ltd Frame for electroacoustic transducer and method for manufacturing the same
JP4033048B2 (en) * 2003-06-11 2008-01-16 ソニー株式会社 Speaker diaphragm manufacturing method and speaker diaphragm
JP4700323B2 (en) * 2004-10-28 2011-06-15 ホシデン株式会社 Flat panel speaker
JP2019054309A (en) * 2016-01-28 2019-04-04 パナソニックＩｐマネジメント株式会社 Speaker diaphragm, loudspeaker, and manufacturing method of speaker diaphragm
CN110256767A (en) * 2019-07-26 2019-09-20 东莞市众一新材料科技有限公司 A kind of high-strength septic tank plastics and preparation method thereof
CN112511957A (en) * 2020-11-02 2021-03-16 歌尔股份有限公司 Vibrating plate for sound production device and sound production device
CN112866879B (en) * 2021-01-04 2022-09-20 歌尔股份有限公司 Ball top, vibrating diaphragm and loudspeaker

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3930979A (en) * 1973-07-18 1976-01-06 Imperial Chemical Industries Limited Porous diaphragms
EP0481306A1 (en) * 1990-10-05 1992-04-22 Sumitomo Chemical Company, Limited Method for molding polypropylene resin
JPH08340594A (en) * 1995-06-14 1996-12-24 Tohoku Pioneer Kk Speaker diaphragm made of injection foamed mold
US5650105A (en) * 1994-05-24 1997-07-22 Yocum; Fred D. Method for making a loudspeaker cone with an integral surround

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3930979A (en) * 1973-07-18 1976-01-06 Imperial Chemical Industries Limited Porous diaphragms
EP0481306A1 (en) * 1990-10-05 1992-04-22 Sumitomo Chemical Company, Limited Method for molding polypropylene resin
US5650105A (en) * 1994-05-24 1997-07-22 Yocum; Fred D. Method for making a loudspeaker cone with an integral surround
JPH08340594A (en) * 1995-06-14 1996-12-24 Tohoku Pioneer Kk Speaker diaphragm made of injection foamed mold

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 04 30 April 1997 (1997-04-30) *

Also Published As

Publication number Publication date
JPH11275687A (en) 1999-10-08
EP0944292A2 (en) 1999-09-22
JP3602327B2 (en) 2004-12-15

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