SPEAKER, AND MODULE AND ELECTRONIC DEVICE USING SUCH SPEAKER

Title:

SPEAKER, AND MODULE AND ELECTRONIC DEVICE USING SUCH SPEAKER

Document Type and Number:

WIPO Patent Application WO/2004/068899

Kind Code:

A1

Abstract:

There is provided a speaker which realizes compatibility between size reduction and sound pressure increase. Further, this speaker also improves the heat capacity of the magnetic circuit and the heat dissipation ability of the voice coil. A magnetic circuit of outer magnet type is formed. It has at least two bar magnets (21), and has a straight section in a magnetic gap defined by an upper plate (22) and a lower plate (23). And the shape of the voice coil (28) is of track type.

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Inventors:

TOMOEDA SHIGERU
FUKUYAMA TAKANORI
SUMIYAMA MASAHIDE

Application Number:

PCT/JP2004/000714

Publication Date:

August 12, 2004

Filing Date:

January 27, 2004

Export Citation:

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Assignee:

MATSUSHITA ELECTRIC IND CO LTD (JP)
TOMOEDA SHIGERU
FUKUYAMA TAKANORI
SUMIYAMA MASAHIDE

International Classes:

H04R9/02; (IPC1-7): H04R9/02

Foreign References:

JP2003032786A	2003-01-31
JP2002186092A	2002-06-28
JPH05191892A	1993-07-30
JP2002526003A	2002-08-13

Other References: