Patent ID: 6608541
Filing Date: 2003-08-19
Classification: H04R

Abstract:
An electromagnetic actuator comprising: (a) a magnet; (b) a pole piece mounted on the magnet; (c) a yoke facing the pole piece; (d) a coil base having a vibration coil facing the pole piece mounted thereon; (e) a leaf spring supporting the coil base; (f) a weight disposed around the periphery of the yoke and supported by the leaf spring, said weight vibrating responsive to excitation of the vibration coil; (g) a voice coil facing the pole piece; (h) a case enclosing (a) through (g); (i) a cover covering one side of the case; and (j) a diaphragm which vibrates responsive to excitation of the voice coil, whereinthe arms of the coil base are inserted through notches formed in the yoke, the vibration coil and the voice coil being disposed in a gap between the pole piece and a face of the yoke.