Patent ID: 6718040
Filing Date: 2004-04-06
Classification: H04R

Abstract:
A loudspeaker device comprising:a transformer comprising: a bobbin having a cavity; a primary winding wound around said bobbin; and a secondary winding wound around said bobbin and magnetically coupled with said primary winding; wherein at least one of said primary winding and said secondary winding is divided into at least two portions which include a portion wound at an inside region of the transformer and a portion wound at an outside region of the transformer; at least a portion of the other one of said primary winding and said secondary winding is wound between said at least two portions obtained by dividing the one of said primary winding and said secondary winding; and at least a portion of said cavity of said bobbin is used as a space to dispose another member therein; and a loudspeaker, connected to said transformer, and including a sound-producing body having a piezoelectric body; wherein at least a portion of said loudspeaker is provided in said cavity of said bobbin.