Speaker, and module and electronic device using the such speaker
AssigneeMatsushita Elec. Ind. Co. Ltd.
InventorsShigeru Tomoeda, Takanori Fukuyama, Masahide Sumiyama
Life of this patent
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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.
Claims14
A loudspeaker comprising a frame coupled to a magnetic circuit formed by supporting in a manner sandwiching at least two pieces of bar magnets with an upper plate and a lower plate, a diaphragm coupled to a perimeter of the frame, and a voice coil a part of which being disposed in a magnetic gap of the magnetic circuit, wherein the voice coil has a shape of a track.
Dependencies are inferred from the claim text.