Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Masahide Sumiyama0
Shigeru Tomoeda0
Takanori Fukuyama0
Date of Patent
June 17, 2008
0Patent Application Number
105116720
Date Filed
January 27, 2004
0Patent Primary Examiner
Patent abstract
A loudspeaker is provided that satisfies requirements for both a small size and a high sound pressure. In addition, the heat capacity of the magnetic circuit and the heat dissipation of the voice coil are improved in this loudspeaker. Using at least two pieces of bar magnets (21), an outer magnet type magnetic circuit is structured in which the magnetic gap comprising an upper plate (22) and a lower plate (23) has a straight section. Also, the configuration of the voice coil (28) is that of a track.
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