Patent ID: 7522741
Filing Date: 2009-04-21
Classification: H04M,H04R

Abstract:
1. An electro-acoustic apparatus having a housing with a housing wall that is defined by an inner wall surface, and having an electro-acoustic transducer that is arranged facing the inner wall surface, wherein the transducer is provided and constructed to generate sound and to emit the generated sound in a sound output direction right through a front chamber volume, and wherein inside the apparatus a sound transmission volume is provided, through which the generated sound channeled right through the front chamber volume can be channeled at least partially in the sound output direction, and wherein in the housing wall there is provided a sound outlet aperture running in the sound output direction and arranged relative to the sound transmission volume offset transversely to the sound output direction, and wherein between the sound transmission volume and the sound outlet aperture there is provided a sound guide channel, which runs substantially transversely to the sound output direction and by means of which the sound transmission volume and the sound outlet aperture are acoustically connected and which forms an acoustic mass; and wherein the sound guide channel and the sound transmission volume are formed by means of a gutter-form recess and a cup-shaped recess provided in the housing wall, both recesses opening out into the inner wall surface, and by means of an annular additional member that lies acoustically tight against the inner wall surface and acoustically tightly seals the gutter-form recess and in which a sound transmission aperture is provided for conducting the generated sound to the sound transmission volume.