JPS55136793A - Diaphragm plate for speaker - Google Patents

Diaphragm plate for speaker

Info

Publication number
JPS55136793A
JPS55136793A JP4563679A JP4563679A JPS55136793A JP S55136793 A JPS55136793 A JP S55136793A JP 4563679 A JP4563679 A JP 4563679A JP 4563679 A JP4563679 A JP 4563679A JP S55136793 A JPS55136793 A JP S55136793A
Authority
JP
Japan
Prior art keywords
speaker
film
diaphragm plate
foaming
methylenediisocyanate
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
JP4563679A
Other languages
Japanese (ja)
Other versions
JPS5857957B2 (en
Inventor
Kazuro Okuzawa
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 JP4563679A priority Critical patent/JPS5857957B2/en
Publication of JPS55136793A publication Critical patent/JPS55136793A/en
Publication of JPS5857957B2 publication Critical patent/JPS5857957B2/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; DEAF-AID SETS; 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 establish the speaker rich in the heat resistance, light and highly efficient, by pressing and heating the polyparabanic acid foaming film of specific density made of the copolymer of methylenediisocyanate and hydrocyanic acid. CONSTITUTION:The polyparabanic acid foaming film 0.4-1.0 in density obtained with the copolymer of methylenediisocyanate and hydrocyanic acid is used to form the dome diaphragm plate by heating and pressing the material. Further, molten film is formed on one side of the foaming layer and porosity of foaming layer is choked with molten film. Thus, the speaker excellent in the heat resistance and light and highly efficient can be obtained.
JP4563679A 1979-04-13 1979-04-13 Diaphragm for speaker Expired JPS5857957B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4563679A JPS5857957B2 (en) 1979-04-13 1979-04-13 Diaphragm for speaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4563679A JPS5857957B2 (en) 1979-04-13 1979-04-13 Diaphragm for speaker

Publications (2)

Publication Number Publication Date
JPS55136793A true JPS55136793A (en) 1980-10-24
JPS5857957B2 JPS5857957B2 (en) 1983-12-22

Family

ID=12724841

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4563679A Expired JPS5857957B2 (en) 1979-04-13 1979-04-13 Diaphragm for speaker

Country Status (1)

Country Link
JP (1) JPS5857957B2 (en)

Also Published As

Publication number Publication date
JPS5857957B2 (en) 1983-12-22

Similar Documents

Publication Publication Date Title
GB1302590A (en)
JPS55136793A (en) Diaphragm plate for speaker
JPS52133711A (en) Circuit two-way operation system
IE781394L (en) Producing oriented polymer material
JPS5366985A (en) Heat-shrinkable multi-layered foaming sheet
JPS5275316A (en) Diaphragm for speakers
JPS56109097A (en) Diaphragm plate for speaker and its manufacture
JPS5262425A (en) Speaker diaphragm manufacturing method
KR880007202A (en) Thermoforming method of thermoplastic resin sheet and apparatus therefor
JPS56125200A (en) Electrode plate electret for electrostatic type electro-acoustic converter
JPS56147598A (en) Diaphragm plate for speaker and its manufacture
JPS57155897A (en) Diaphragm for speaker
JPS53120791A (en) Melt extrusion-coated material
JPS55121794A (en) Speaker diaphragm
JPS5762696A (en) Diaphragm for speaker
JPS5610795A (en) Acoustic diaphragm
JPS57155898A (en) Diaphragm for speaker
JPS57164696A (en) Manufacture of diaphragm plate for speaker
JPS5267613A (en) Speaker
JPS56164699A (en) Diaphragm plate for speaker
JPS5624759A (en) Preparation of electrode separator
JPS5658395A (en) Manufacture for diaphragm plate for speaker
JPS56100599A (en) Diaphragm for speaker
JPS5285075A (en) Preparation of semipermeable membrane composition
JPS57173195A (en) Heat-sensitive transfer paper