JPS56141697A - Preparation of vibration diaphragm for speaker - Google Patents

Preparation of vibration diaphragm for speaker

Info

Publication number
JPS56141697A
JPS56141697A JP4583680A JP4583680A JPS56141697A JP S56141697 A JPS56141697 A JP S56141697A JP 4583680 A JP4583680 A JP 4583680A JP 4583680 A JP4583680 A JP 4583680A JP S56141697 A JPS56141697 A JP S56141697A
Authority
JP
Japan
Prior art keywords
bobbin
metallic
base body
cylindrical
forming
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
JP4583680A
Other languages
Japanese (ja)
Inventor
Minetaro Hirose
Tsutomu Hiroki
Yoshiro Shimamune
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP4583680A priority Critical patent/JPS56141697A/en
Publication of JPS56141697A publication Critical patent/JPS56141697A/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
    • 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

Abstract

PURPOSE:To make a material of a metallic foil inexpensive and reduce a manufacturing cost, by making use of heating so that hot forming is performed at the same time in the process of surface hardening treatment including a heating process, and reducing a forming complicacy of a metallic foil prior to the surface hardening treatment. CONSTITUTION:The bobbin 1a is not cylindrical entirely but remains formed in a nearly cylindrical shape which becomes narrower in the lower part in the figure. When a temperature of the metallic base body 1 rises in a state as shown in the figure, the metallic body 1 is softened and simultaneously the elongation percentage becomes large, too, therefore, said punch 10 sinks into the bobbin 1a by its own- weight, it is formed so as to widen the narrow part of the bobbin 1a and correct it to a cylindrical form, and it is formed to a shape of the part 8a in the figure. Thereafter, when a temperature further rises, hardening layer forming atoms diffuse and permeate on the surface of the metallic base body 1 from the dispersing agent 2, and a harden layer is formed.
JP4583680A 1980-04-08 1980-04-08 Preparation of vibration diaphragm for speaker Pending JPS56141697A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4583680A JPS56141697A (en) 1980-04-08 1980-04-08 Preparation of vibration diaphragm for speaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4583680A JPS56141697A (en) 1980-04-08 1980-04-08 Preparation of vibration diaphragm for speaker

Publications (1)

Publication Number Publication Date
JPS56141697A true JPS56141697A (en) 1981-11-05

Family

ID=12730300

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4583680A Pending JPS56141697A (en) 1980-04-08 1980-04-08 Preparation of vibration diaphragm for speaker

Country Status (1)

Country Link
JP (1) JPS56141697A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6185809B1 (en) * 1996-06-19 2001-02-13 Akg Acoustics Gmbh Method of manufacturing a diaphragm for an electroacoustic transducer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6185809B1 (en) * 1996-06-19 2001-02-13 Akg Acoustics Gmbh Method of manufacturing a diaphragm for an electroacoustic transducer

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