JPS57155898A - Diaphragm for speaker - Google Patents

Diaphragm for speaker

Info

Publication number
JPS57155898A
JPS57155898A JP4093881A JP4093881A JPS57155898A JP S57155898 A JPS57155898 A JP S57155898A JP 4093881 A JP4093881 A JP 4093881A JP 4093881 A JP4093881 A JP 4093881A JP S57155898 A JPS57155898 A JP S57155898A
Authority
JP
Japan
Prior art keywords
material sheet
sheet
core material
foamed
heated
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.)
Pending
Application number
JP4093881A
Other languages
Japanese (ja)
Inventor
Toru Yamamoto
Hirotoshi Niiguchi
Mitsuru Yashiro
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.)
Panasonic Holdings Corp
Original Assignee
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
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP4093881A priority Critical patent/JPS57155898A/en
Publication of JPS57155898A publication Critical patent/JPS57155898A/en
Pending 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

Abstract

PURPOSE:To flatten frequency characteristics by lessening fluctuations by heat- sealing a surface material sheet of thermoplastic resin, obtained by mixing carbon fiber and adhesive fiber, on the surface of a foamed material sheet consisting essentialy of thermoplastic resin. CONSTITUTION:A surface sheet 1 while superposed on the surface of a core material sheet 2 is passed between heater-incorporated rollers 3 and 3'. Then, since those rollers 3 and 3' are heated at low temperature, the core material sheet 2 and surface material sheet 1 are heat-sealed. The resulting composite sheet 6 is heated at high temperature by heaters 4 and 4' for several seconds. A foamed material in the core material sheet 2 is heated above its foaming start temperature by the heaters 4 and 4' to be foamed, and polyethylene short fiber of the surface material sheet 1 and polyethylene which is the base material of the core material sheet 2 are molten. Thus, the composite sheet 6 is treated by cold press between dies 5 and 5' to be formed in a diaphragm shape.
JP4093881A 1981-03-20 1981-03-20 Diaphragm for speaker Pending JPS57155898A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4093881A JPS57155898A (en) 1981-03-20 1981-03-20 Diaphragm for speaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4093881A JPS57155898A (en) 1981-03-20 1981-03-20 Diaphragm for speaker

Publications (1)

Publication Number Publication Date
JPS57155898A true JPS57155898A (en) 1982-09-27

Family

ID=12594437

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4093881A Pending JPS57155898A (en) 1981-03-20 1981-03-20 Diaphragm for speaker

Country Status (1)

Country Link
JP (1) JPS57155898A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59158197A (en) * 1983-02-25 1984-09-07 Agency Of Ind Science & Technol Diaphragm for speaker
JPS63315238A (en) * 1987-12-28 1988-12-22 シュレイナー　ルシュトバート　グロエプ　ビー　ブイ Manufacture of molded article by using sandwich structure
CN109094581A (en) * 2018-08-28 2018-12-28 中车工业研究院有限公司 A kind of high-speed train equipment ceiling skirtboard and preparation method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59158197A (en) * 1983-02-25 1984-09-07 Agency Of Ind Science & Technol Diaphragm for speaker
JPS63315238A (en) * 1987-12-28 1988-12-22 シュレイナー　ルシュトバート　グロエプ　ビー　ブイ Manufacture of molded article by using sandwich structure
CN109094581A (en) * 2018-08-28 2018-12-28 中车工业研究院有限公司 A kind of high-speed train equipment ceiling skirtboard and preparation method thereof
CN109094581B (en) * 2018-08-28 2019-11-26 中车工业研究院有限公司 A kind of high-speed train equipment ceiling skirtboard and preparation method thereof

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