Patent ID: 6493452
Filing Date: 2002-12-10
Classification: H04R

Abstract:
A speaker unit comprising:a woofer having a diaphragm with an elliptically shaped sound emitting opening; and a separate speaker having an elliptically shaped diaphragm with an area smaller than an area of the diaphragm of the woofer, the separate speaker being located in front of the diaphragm of the woofer and attached at a center axis of the elliptically shaped sound emitting opening of the woofer with an open space therearound and coincident with a center axis of the elliptically shaped diaphragm of the separate speaker, and the separate speaker emitting a sound higher in frequency than a sound of the woofer, wherein the separate speaker having the elliptically shaped diaphragm is attached in such a manner that a longest diameter and a shortest diameter of the ellipse thereof are made respectively coincident with a longest diameter and a shortest diameter of the elliptically shaped sound emitting opening of the woofer, and wherein when the longest diameter and the shortest diameter of the elliptically shaped sound emitting opening of the separate speaker are each taken as 1, respective ratios thereof relative to a longest diameter and a shortest diameter of the elliptically shaped diaphragm of the woofer are selected to be between &frac13; and {fraction (1/2.5)}, respectively.