JPS5657396A - Acoustic diaphragm - Google Patents

Acoustic diaphragm

Info

Publication number
JPS5657396A
JPS5657396A JP13403979A JP13403979A JPS5657396A JP S5657396 A JPS5657396 A JP S5657396A JP 13403979 A JP13403979 A JP 13403979A JP 13403979 A JP13403979 A JP 13403979A JP S5657396 A JPS5657396 A JP S5657396A
Authority
JP
Japan
Prior art keywords
diaphragm
graphite
sheet
sound speed
resin
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.)
Granted
Application number
JP13403979A
Other languages
Japanese (ja)
Other versions
JPS6052639B2 (en
Inventor
Hiroshi Hasegawa
Takashi Wakabayashi
Morihiro Miyazaki
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 JP13403979A priority Critical patent/JPS6052639B2/en
Publication of JPS5657396A publication Critical patent/JPS5657396A/en
Publication of JPS6052639B2 publication Critical patent/JPS6052639B2/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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

PURPOSE:To obtain a diaphragm having a high sound speed and large internal loss, by using a material obtained by bonding the graphite via the polyaminobismaleimide resin. CONSTITUTION:The acoustic diaphragm is formed by bonding the graphite with the polyaminobismaleimide resin. Such diaphragm is preferably formed into a sheet having a thickness of about 0.5mm. by mixing the 20.0g polyaminobismaleimide resin and about 30.0g graphite impalpable powder to be then kneaded by two pieces of 120 deg.C rolls about 10min. This sheet is then held between the iron plates the surfaces of which are coated by the fluorine-group resin to be pressed by 500kg/cm and at 250 deg.C and then receive an after-cure for 5hr and at 250 deg.C. Thus a flat plate is obtained with a thickness of 100mum. The plate of 1X4.5cm is cut out of the flat plate. A sound speed of 4,800m/sec and Q=27 or so is measured for the sound speed via the cantilever. After this the sheet is crashed and then pressed with a pressure of 400kg/cm to produce a column having the diameter of 40mm.. This column then receives a transfer forming with 500kg/cm and at 260 deg.C to obtain a cone for a woofer. In such way, an excellent acoustic diaphragm can be obtained.
JP13403979A 1979-10-16 1979-10-16 acoustic diaphragm Expired JPS6052639B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13403979A JPS6052639B2 (en) 1979-10-16 1979-10-16 acoustic diaphragm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13403979A JPS6052639B2 (en) 1979-10-16 1979-10-16 acoustic diaphragm

Publications (2)

Publication Number Publication Date
JPS5657396A true JPS5657396A (en) 1981-05-19
JPS6052639B2 JPS6052639B2 (en) 1985-11-20

Family

ID=15118934

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13403979A Expired JPS6052639B2 (en) 1979-10-16 1979-10-16 acoustic diaphragm

Country Status (1)

Country Link
JP (1) JPS6052639B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983000791A1 (en) * 1981-08-27 1983-03-03 Hasumi, Shigeru Vibrating plate for speaker

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0356158U (en) * 1989-10-03 1991-05-30

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983000791A1 (en) * 1981-08-27 1983-03-03 Hasumi, Shigeru Vibrating plate for speaker
EP0086837B1 (en) * 1981-08-27 1985-12-27 Toray Industries, Inc. Vibrating plate for speaker

Also Published As

Publication number Publication date
JPS6052639B2 (en) 1985-11-20

Similar Documents

Publication Publication Date Title
JPS5546661A (en) Diaphragm for acoustic apparatus and its manufacture
JPS5657396A (en) Acoustic diaphragm
JPS5262425A (en) Speaker diaphragm manufacturing method
JPS5275316A (en) Diaphragm for speakers
JPS52111714A (en) Electrokinetic type electroacoustic transducer with metallic vibr ating plate
JPS55127437A (en) Production of composite ion-exchange membrane
JPS5391085A (en) Deposition apparatus of gas phase chemical reaction substance utilized plasma discharge
JPS5535558A (en) Sounding material
JPS54105525A (en) Diaphragm for speakers
JPS53100222A (en) Production of diaphragm for speakers
JPS5226600A (en) Process for preparing cationic polymers
JPS5313239A (en) Manufacturing process of laminated electrical heat plate
JPS5616395A (en) Speaker diaphragm
JPS56168492A (en) Speaker diaphragm
JPS53140017A (en) Production of wooden instrument
JPS5298516A (en) Production of diaphragm for speakers
JPS5689198A (en) Diaphragm for speaker
JPS5275428A (en) Diaphragm for speakers
JPS5614796A (en) Diaphragm for loudspeaker
JPS51120355A (en) Process for making diaphragm by photoetching
JPS5275314A (en) Diaphragm for speaker
JPS5656094A (en) Manufacture of acoustic enclosure
JPS5793797A (en) Vibration diaphragm for speaker
JPS56146397A (en) Composite acoustic diaphragm
JPS5275429A (en) Diaphragm for speakers