MAGNETIC CIRCUIT FOR SPEAKER DEVICE AND SPEAKER DEVICE

WIPO Patent Application WO/2011/004480

A1

A thin magnetic circuit for driving a flat voice coil which allows a reduction in the thickness of a speaker device.  A magnetic circuit (20) for a speaker device is provided with magnetic gaps (20G) arranged in the direction of vibration of a voice coil (30).  Among magnetic pole surfaces partitioned by a voice coil facing the magnetic gaps, a magnetic pole surface on one side is provided with a first magnetic pole surface (20X) comprising a magnetic body including a magnet (21) and also with  a second magnetic pole surface (20Y) comprising a plate-like magnetic body magnetically joined to the magnet.  In the plate-like magnetic body, a joint surface, which is located between the plate-like magnetic body and the magnetic body forming the first magnetic pole surface, and the second magnetic pole surface are formed in a step-like shape, and the first magnetic pole surface and the second magnetic pole surface have substantially the same height.

JP4913573	Magnetic circuit for speaker and speaker
JP2017521951	Sound transducer

HORIGOME MINORU (JP)
KOBAYASHI HIROYUKI (JP)
HIKICHI TOSHIHIRO (JP)
FURUTO AKIHIKO (JP)

PCT/JP2009/062483

January 13, 2011

July 09, 2009

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PIONEER CORP (JP)
PIONEER TOHOKU CORP (JP)
HORIGOME MINORU (JP)
KOBAYASHI HIROYUKI (JP)
HIKICHI TOSHIHIRO (JP)
FURUTO AKIHIKO (JP)

H04R9/02; H04R9/04

JP2005159409A	2005-06-16
JPS63250995A	1988-10-18

EICHI Patent & Trademark Corp. et al. (JP)
Patent business corporation Wisdom international patent firm (JP)

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