Patent ID: 6359541
Filing Date: 2002-03-19
Classification: H04R

Abstract:
A surface-mounted electromagnetic sound generator comprising:a case; a yoke including a magnetic-circuit board accommodated inside said case and having cut-outs; a coil attached to said yoke and having terminals; a ring-shaped magnet placed about said coil and having an inner circumferential surface, an outer circumferential surface and an underside provided with a plurality of recesses at symmetrical positions thereof, each recess extending through the magnet in tunnel-like fashion from the inner circumferential surface to the outer circumferential surface; a vibration plate disposed to oppose said yoke; and a plurality of surface-mounted electrodes each having: a joining portion led out to the exterior of said case for being joined to an external electrically conductive member; and a connecting portion led into one of the space formed by the recesses of said magnet and the cut-outs of said yoke; and wherein the terminals of said coil extend into the plurality of space formed by the recesses of said magnet and the cut-outs of said yoke and attached to respective ones of the connecting portions of the electrodes.