JPS5657399A - Magnetic circuit - Google Patents

Magnetic circuit

Info

Publication number
JPS5657399A
JPS5657399A JP13385879A JP13385879A JPS5657399A JP S5657399 A JPS5657399 A JP S5657399A JP 13385879 A JP13385879 A JP 13385879A JP 13385879 A JP13385879 A JP 13385879A JP S5657399 A JPS5657399 A JP S5657399A
Authority
JP
Japan
Prior art keywords
given
working
secure
reproduced sound
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.)
Pending
Application number
JP13385879A
Other languages
Japanese (ja)
Inventor
Koji Maekawa
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 JP13385879A priority Critical patent/JPS5657399A/en
Publication of JPS5657399A publication Critical patent/JPS5657399A/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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit

Landscapes

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

Abstract

PURPOSE:To secure an easy magnetization and at the same way obtain a high- fidelity reproduced sound, by using the iron component received a plastic working for at least one of the component members of the magnetic circuit opposing to the magnetic gap. CONSTITUTION:A press forming is given via a pair of pressing molds 12 to the dughnut-shaped material 11 made of the iron component. The step area 11b is formed around the center hole 11a of the material 11 by the projection 12c of the cope 12a of the mold 12, and finally a finish working is given to secure the prescribed measurements for the inner diameter of the hole 11a and the external shape of the material. In this way, the plate 1 is obtained. For this plate 1, the particles of the material 11 are arranged along the radius direction owing to the pressure caused by the pressing working. As a result, the magnetic flux produced by the permanent magnet becomes easy to pass with a reduction given to the distortion for the current of the voice coil, thus obtaining a high-fidelity reproduced sound.
JP13385879A 1979-10-17 1979-10-17 Magnetic circuit Pending JPS5657399A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13385879A JPS5657399A (en) 1979-10-17 1979-10-17 Magnetic circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13385879A JPS5657399A (en) 1979-10-17 1979-10-17 Magnetic circuit

Publications (1)

Publication Number Publication Date
JPS5657399A true JPS5657399A (en) 1981-05-19

Family

ID=15114679

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13385879A Pending JPS5657399A (en) 1979-10-17 1979-10-17 Magnetic circuit

Country Status (1)

Country Link
JP (1) JPS5657399A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102847785A (en) * 2011-06-29 2013-01-02 英业达股份有限公司 Process method of one-time stamping and manufacturing method of CPU backplane

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102847785A (en) * 2011-06-29 2013-01-02 英业达股份有限公司 Process method of one-time stamping and manufacturing method of CPU backplane

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