Title:
MAGNETIC CIRCUIT, SPEAKER, AND HEADPHONE
Document Type and Number:
Japanese Patent JP2005311449
Kind Code:
A
Abstract:
To obtain a strong and efficient magnetic circuit by improving the magnetic characteristics of the permanent magnet of a disk or circular shape.
The magnetic circuit has the permanent magnet 12 of a disk or circular shape which is magnetized in the axial direction of a disk or a circular ring. The permanent magnet 12 is divided into a plurality of magnets 12a in a circumferential direction, and the plurality of magnets 12a are each formed by a transverse magnetic field press method using a direction perpendicular to the central axis of the disk or circle as a press direction.
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Inventors:
TSUNODA NAOTAKA
HARA TAKESHI
HARA TAKESHI
Application Number:
JP2004121919A
Publication Date:
November 04, 2005
Filing Date:
April 16, 2004
Export Citation:
Assignee:
SONY CORP
International Classes:
H04R1/10; H02K33/18; H04R9/02; (IPC1-7): H04R9/02; H02K33/18; H04R1/10
Attorney, Agent or Firm:
Yoshitsuno Kakuda
Hironobu Isoyama
Hironobu Isoyama
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