US Patent 7221773 Oval speaker apparatus and method of manufacturing the same

An oval speaker apparatus includes a diaphragm whose outer peripheral shape in a plan view is oval or elliptical; an oval or elliptical voice coil for driving the diaphragm; an edge which is joined to an outer periphery of the diaphragm; and a frame to which an outer peripheral edge of the edge is fixed. Further, lead wire which is led out from the voice coil is wired so as to traverse the surface of the edge along the minor-axis direction of the diaphragm, and is provided with slack.