Masahide Sumiyama

Loudspeaker, and module and electronic apparatus using the loudspeaker

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.

Flat panel speaker system with a coated diaphragm

A speaker system having a structure in which the room surrounding the first diaphragm and the room adjacent to the second diaphragm are acoustically coupled. The second diaphragm has coating on a surface. Applying the coating to the second diaphragm enhances the reliability and performance of the speaker system. Besides, the diversely definable geometry of the diaphragm allows an electronic device employing the speaker system or the speaker module to have flexibility in design.

Speaker module and apparatus using this

A speaker module includes a first diaphragm and a second diaphragm acoustically coupled with each other as a part of a wall forming a hermetic space with a panel. A light emitting section emits light to the panel, and the panel transmits the light to a side of the second diaphragm. The speaker module is configured to emit sound and light.