Patent ID: 6744895
Filing Date: 2004-06-01
Classification: H04R

Abstract:
A loudspeaker, comprising:a cylindrical case; a first diaphragm provided in the case at an upper side portion thereof; a second diaphragm provided in the case at a lower side portion thereof; an annular first voice coil secured to an underside of the first diaphragm for vibrating the first diaphragm; an annular second voice coil secured to an upper side of the second diaphragm for vibrating the second diaphragm; an annular first permanent magnet; a second permanent magnet disposed within an inner space of the annular first permanent magnet; a first magnetic gap formed on an outer side of the second permanent magnet for applying a magnetic flux to the first voice coil; and a second permanent magnetic gap formed on an inner side of the annular first permanent magnet for applying a magnetic flux to the second voice coil.