Patent ID: 7319773
Filing Date: 2008-01-15
Classification: H04B,H04M,H04R

Abstract:
1. A subminiature bone conduction speaker using a vibrating plate comprising: a body having a shape of a cylinder of which upper portion is opened; a yoke which is disposed in a lower portion of the body and of which center has a protrusion; a ring type magnet which is formed on the edge of the yoke and apart from an end portion of the protrusion by a predetermined clearance; an upper plate which is formed on the magnet; a mastoid to transmit a vibration to a skull of a user for stimulating an auditory nerve of the user; an acoustic vibrating plate which is inserted at a lower side of the mastoid to cover the opening portion of the body and which is made of an elastic material; an auxiliary vibrating plate which is inserted under the acoustic vibrating plate which is inserted to the mastoid; the auxiliary vibrating plate including a howl-prevention hole, so that a howling effect is prevented at ears of the user; a voice coil which is attached to the auxiliary vibrating plate and which is inserted between the end portion of the protrusion of the yoke and the ring type magnet; a front cap for fixing the acoustic vibrating plate on the body; and an electrical signal input unit for inputting an electric signal to the voice coil.