JPS56797A - Manufacture for acoustic diaphragm plate - Google Patents

Manufacture for acoustic diaphragm plate

Info

Publication number
JPS56797A
JPS56797A JP2412080A JP2412080A JPS56797A JP S56797 A JPS56797 A JP S56797A JP 2412080 A JP2412080 A JP 2412080A JP 2412080 A JP2412080 A JP 2412080A JP S56797 A JPS56797 A JP S56797A
Authority
JP
Japan
Prior art keywords
diaphragm plate
elasticity
crude oil
specific modulus
pitch
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
JP2412080A
Other languages
Japanese (ja)
Other versions
JPS5711558B2 (en
Inventor
Nobuhiro Tsukagoshi
Teruo Toma
Shinichi Yokozeki
Toshikazu Yoshino
Yasuhiro Arai
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.)
Pioneer Corp
Original Assignee
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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP2412080A priority Critical patent/JPS56797A/en
Publication of JPS56797A publication Critical patent/JPS56797A/en
Publication of JPS5711558B2 publication Critical patent/JPS5711558B2/ja
Granted 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
    • 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

Landscapes

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

Abstract

PURPOSE:To enable to form diaphragm plate having greater specific modulus of elasticity and internal loss, by carbonizing the mixture of crude oil separated pitch and graphite powder. CONSTITUTION:Crude oil separated pitch and graphite powder are mixed, and it is pressed into desired diaphragm plate shape. Next, this mold is heated in air for surface oxidation and at the next process, is made nonfusible to avoid deformation. Next, the mold via the nonfusible process is heated under nonoxidative atmosphere such as nitrogen or argon gas for carbonization. Thus, the diaphragm plate having greater specific modulus of elasticity and internal loss can be formed in a simple process. Further, by using liquidified crude oil separation pitch, the specific modulus of elasticity can further be increased.
JP2412080A 1980-02-29 1980-02-29 Manufacture for acoustic diaphragm plate Granted JPS56797A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2412080A JPS56797A (en) 1980-02-29 1980-02-29 Manufacture for acoustic diaphragm plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2412080A JPS56797A (en) 1980-02-29 1980-02-29 Manufacture for acoustic diaphragm plate

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP2411980A Division JPS55157652A (en) 1980-02-29 1980-02-29 Molding composition

Publications (2)

Publication Number Publication Date
JPS56797A true JPS56797A (en) 1981-01-07
JPS5711558B2 JPS5711558B2 (en) 1982-03-04

Family

ID=12129444

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2412080A Granted JPS56797A (en) 1980-02-29 1980-02-29 Manufacture for acoustic diaphragm plate

Country Status (1)

Country Link
JP (1) JPS56797A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5924411A (en) * 1982-07-30 1984-02-08 Sony Corp Video and audio reproducing device
US4766529A (en) * 1982-05-11 1988-08-23 Casio Computer Co., Ltd. Operator guidance by computer voice synthesizer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5454621A (en) * 1977-10-11 1979-05-01 Matsushita Electric Ind Co Ltd Diaphragm for acoustic apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5454621A (en) * 1977-10-11 1979-05-01 Matsushita Electric Ind Co Ltd Diaphragm for acoustic apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4766529A (en) * 1982-05-11 1988-08-23 Casio Computer Co., Ltd. Operator guidance by computer voice synthesizer
JPS5924411A (en) * 1982-07-30 1984-02-08 Sony Corp Video and audio reproducing device

Also Published As

Publication number Publication date
JPS5711558B2 (en) 1982-03-04

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