CA1090086A - Procede de fabrication de plaques magnetiques pour transducteurs electroacoustiques - Google Patents

Procede de fabrication de plaques magnetiques pour transducteurs electroacoustiques

Info

Publication number
CA1090086A
CA1090086A CA249,429A CA249429A CA1090086A CA 1090086 A CA1090086 A CA 1090086A CA 249429 A CA249429 A CA 249429A CA 1090086 A CA1090086 A CA 1090086A
Authority
CA
Canada
Prior art keywords
plate
perforations
thickness
magnet
magnetic plate
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.)
Expired
Application number
CA249,429A
Other languages
English (en)
Inventor
Toyosaku 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.)
Nippon Gakki Co Ltd
Original Assignee
Nippon Gakki 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 Nippon Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
Application granted granted Critical
Publication of CA1090086A publication Critical patent/CA1090086A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • 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
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Powder Metallurgy (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
CA249,429A 1975-04-04 1976-04-02 Procede de fabrication de plaques magnetiques pour transducteurs electroacoustiques Expired CA1090086A (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP50-40250 1975-04-04
JP4025075A JPS51115817A (en) 1975-04-04 1975-04-04 Magnet plate for electro-acoustic transducing and the method of its ma nufacture

Publications (1)

Publication Number Publication Date
CA1090086A true CA1090086A (fr) 1980-11-25

Family

ID=12575442

Family Applications (1)

Application Number Title Priority Date Filing Date
CA249,429A Expired CA1090086A (fr) 1975-04-04 1976-04-02 Procede de fabrication de plaques magnetiques pour transducteurs electroacoustiques

Country Status (3)

Country Link
JP (1) JPS51115817A (fr)
CA (1) CA1090086A (fr)
GB (1) GB1524124A (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54145958A (en) * 1978-05-09 1979-11-14 Yokohama Kagaku Kinzoku Kk Method of producing porous magnet and mold used for executing same
ES2016502A6 (es) * 1989-08-31 1990-11-01 Uralita Sa Teja ceramica.
GB2315266B (en) * 1996-07-12 1999-11-17 Ibm Magnet and method for manufacturing a magnet

Also Published As

Publication number Publication date
JPS51115817A (en) 1976-10-12
JPS5442609B2 (fr) 1979-12-15
GB1524124A (en) 1978-09-06

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Legal Events

Date Code Title Description
MKEX Expiry