Patent ID: 7426283
Filing Date: 2008-09-16
Classification: H04R

Abstract:
1. A speaker device comprising: a magnet that generates magnetic flux; an inner-radial magnetic-flux applying unit including an outer circumferential surface; an outer-radial magnetic-flux applying unit including an inner circumferential surface, a main unit having a first diameter, and at least one piece of annular sub-unit having a second diameter stacked on an end of the main unit on a side of an opening of the main unit; a voice coil that is supported in a vibrating manner in a magnetic gap that is formed between the outer circumferential surface and the inner circumferential surface by a magnetic circuit formed with the magnet, the inner-radial magnetic-flux applying unit, and the outer-radial magnetic-flux applying unit, to which the magnetic flux is applied via the inner-radial magnetic-flux applying unit and the outer-radial magnetic-flux applying unit; a heat-dissipating member that is made of a material with a good thermal conductivity, encompasses an end portion of the outer-radial magnetic-flux applying unit including the sub-unit, and is thermally bonded with the outer-radial magnetic-flux applying unit; and a frame that encloses the magnetic circuit, wherein an outer peripheral portion of the heat-dissipating member is thermally bonded with the frame, and wherein the outer peripheral portion includes a frame contact portion that widens along an inner surface of the frame in a manner so as to skirt cover the magnet in a nested-structure manner with the frame, while thermally bonding with the frame.