Patent ID: 6327371
Filing Date: 2001-12-04
Classification: H04R

Abstract:
A loudspeaker, comprisinga frame;an upper suspension having one end connected to said frame, and an opposite end connected to a diaphragm;a lower suspension having one end connected to said frame;a motor structure including a top plate, a back plate, a magnet connected between said top plate and said back plate and a pole piece concentrically disposed within a bore collectively formed by said top plate and said magnet, a gap being formed between said pole piece and said top plate;a voice coil including a former carrying a wire winding, said former being formed with a number of vent bores spaced from said wire winding;an adaptor including a wall having a first end, a second end and an intermediate portion between said first and second ends, said first end of said wall being directly mounted to said former in position so that said intermediate portion extends along side said former in alignment with said vent bores therein, said intermediate portion of said wall being radially spaced from said former to form a passage therebetween;each of said diaphragm and said lower suspension being connected to said wall of said adaptor which is interposed between said former and said lower suspension and diaphragm so that said voice coil is positioned for axial movement in said gap between said top plate and pole piece;a cavity being formed in an area overlying said pole piece from which air is vented along a flow path which includes said vent bores in said former and said passage in between said intermediate portion of said wall of said adaptor and said former, said intermediate portion of said adaptor being located relative to said former so that air passing through said vent bores is deflected by said intermediate portion in a direction toward said wire winding of said voice coil.