Patent ID: 8045747

Claim:
A bi-directional loudspeaker comprising: A frame ( 2 ); A spider ( 15 ), having a waving surface and a hole in the centre, is mounted on a top of said frame ( 2 ); A supporting ring ( 12 ) fitted onto an exterior of said spider ( 15 ); A diaphragm ( 9 ) is disposed between the frame ( 2 ) and the spider ( 15 ); A U-yoke ( 3 ) is disposed between the frame ( 2 ) and diaphragm ( 9 ); A voice coil ( 8 ) having one end thereof fitted into the U-yoke ( 3 ), is disposed between the diaphragm ( 9 ) and the U-yoke ( 3 ); A first magnet ( 4 ), a washer ( 5 ), a copper cap ( 6 ) and a second magnet ( 7 ) are arranged in above order and incorporated between said U-yoke ( 3 ) and voice coil ( 8 ); A dust cap ( 18 ) mounted on a top of the diaphragm ( 9 ); and A connector ( 1 ) for providing signal input is disposed on a side of the frame ( 2 ) and electrically connected with said voice coil ( 8 ); said bi-directional loudspeaker is characterized in that: Said diaphragm ( 9 ) is in a cone shape whose a wider opening is facing downwardly and an apex penetrates a centre of the spider ( 15 ); an inner edge ( 10 ) of said apex is fixed with a top of said voice coil ( 8 ); a periphery ( 16 ) of the spider ( 15 ) is fixed with an upper edge ( 14 ) of the supporting ring ( 12 ) and a bottom edge ( 13 ) hereof is fixed with an exterior ( 11 ) of the diaphragm ( 9 ); Said spider ( 15 ), spacer ( 12 ) and diaphragm ( 9 ) are coupled by an adhesive and fixed on the top of said frame ( 2 ).