JPS57178497A - Manufacture of upper plate for speaker - Google Patents

Manufacture of upper plate for speaker

Info

Publication number
JPS57178497A
JPS57178497A JP6284881A JP6284881A JPS57178497A JP S57178497 A JPS57178497 A JP S57178497A JP 6284881 A JP6284881 A JP 6284881A JP 6284881 A JP6284881 A JP 6284881A JP S57178497 A JPS57178497 A JP S57178497A
Authority
JP
Japan
Prior art keywords
speaker
upper plate
less carbon
product
manufacture
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
JP6284881A
Other languages
Japanese (ja)
Inventor
Kiyomasa Matsumoto
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.)
DAIICHI KIKO KK
DAIICHI KIKOU KK
TOUYOU DENKI KK
TOYO DENKI KK
Original Assignee
DAIICHI KIKO KK
DAIICHI KIKOU KK
TOUYOU DENKI KK
TOYO DENKI KK
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 DAIICHI KIKO KK, DAIICHI KIKOU KK, TOUYOU DENKI KK, TOYO DENKI KK filed Critical DAIICHI KIKO KK
Priority to JP6284881A priority Critical patent/JPS57178497A/en
Publication of JPS57178497A publication Critical patent/JPS57178497A/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/024—Manufacturing aspects of the magnetic circuit of loudspeaker or microphone transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Manufacturing & Machinery (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

PURPOSE:To manufacture an upper plate for a speaker which has superior cm magnetic performance by using a bar material of iron containing less carbon by employing a forging method. CONSTITUTION:A plastic bar material 6 iron containing less carbon is cut to obtain a discoid raw material 7. The raw material 7 is placed in a die 9 which has a die hole 8 conforming to the external circumference shape of an upper plate for a speaker and cold forging is carried out with a press hammer 10 to obtain a discoid intermediate product 11. At the surface center part of this intermediate product 11, a recess 13 is formed with a press hammer 12 and after this product is turned over, a similar recess 14 is formed on its reverse side. Then, the center part is punched with a punch 15 to form a center hole 16, thus obtaining a product. Consequently, the upper plate for the speaker which has superior magnetic performance is obtained by using a material which contains less carbon.
JP6284881A 1981-04-25 1981-04-25 Manufacture of upper plate for speaker Pending JPS57178497A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6284881A JPS57178497A (en) 1981-04-25 1981-04-25 Manufacture of upper plate for speaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6284881A JPS57178497A (en) 1981-04-25 1981-04-25 Manufacture of upper plate for speaker

Publications (1)

Publication Number Publication Date
JPS57178497A true JPS57178497A (en) 1982-11-02

Family

ID=13212132

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6284881A Pending JPS57178497A (en) 1981-04-25 1981-04-25 Manufacture of upper plate for speaker

Country Status (1)

Country Link
JP (1) JPS57178497A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01126693U (en) * 1987-05-07 1989-08-30

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5398589A (en) * 1977-02-10 1978-08-29 Hisao Miyashita Precision finishing method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5398589A (en) * 1977-02-10 1978-08-29 Hisao Miyashita Precision finishing method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01126693U (en) * 1987-05-07 1989-08-30

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