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US 6,639,994 B1Granted
Loudspeaker having adjustable motor strength
AssigneeJL Audio, Inc.
InventorsLucio Proni, Brett E. Hanes
Life of this patent
Estimating the term…
Abstract
A loudspeaker comprises a motor structure which incorporates a magnetic flux control system including a field winding, a controller connected between a voltage source and the field winding and, a polarity reversal switch preferably located across the filed winding. The magnetic flux control system is operative to produce a magnetic flux, which, depending on the level and polarity of electrical current supplied to the field winding, either reinforces or opposes the static magnetic flux produced by the magnet of the motor structure of the loudspeaker, thus altering the motor strength of the loudspeaker system.
Claims31
A loudspeaker, comprising:
- a motor structure including a back plate, a top plate, a magnetic gap and a permanent magnet interposed between said back plate and top plate which creates magnetic flux within said magnetic gap;
- a frame having a first end connected to an upper suspension and a second end connected to said motor structure;
- a voice coil movable within said magnetic gap, said voice coil being connected to a diaphragm which extends between said voice coil and said upper suspension, said voice coil having an outer surface wrapped with a wire winding which is adapted to connect to a source of electrical energy, said voice coil producing a magnetic flux when energized with electrical energy which alternately opposes and reinforces said magnetic flux created by said permanent magnet within said magnetic gap;
- a magnetic flux control system adapted to connect to said source of electrical energy and including a field winding and a controller, said controller being manually adjustable to a desired setting to vary the level of electrical current supplied to said field winding so as to vary the magnetic flux produced by said field winding, said field winding being located within said motor structure in position such that said magnetic flux produced by said field winding is effective to either reinforce or to oppose the magnetic flux created by said permanent magnet within said magnetic gap.
1 more element
A loudspeaker, comprising:
- a motor structure including a back plate, a top plate, a magnetic gap and a permanent magnet interposed between said back plate and top plate which creates magnetic flux within said magnetic gap;
- a frame having a first end connected to an upper suspension and a second end connected to said motor structure;
- a voice coil movable within said magnetic gap, said voice coil being connected to a diaphragm which extends between said voice coil and said upper suspension, said voice coil having an outer surface wrapped with a wire winding which is adapted to connect to a source of electrical energy, said voice coil producing a magnetic flux when energized with electrical energy which alternately opposes and reinforces said magnetic flux created by said permanent magnet within said magnetic gap;
- a magnetic flux control system adapted to connect to said source of electrical energy and including a field winding and a controller, said controller being manually adjustable to a desired setting to vary the level and polarity of electrical current supplied to said field winding so as to vary the magnetic flux produced by said field winding, said field winding being located within said motor structure in position such that said magnetic flux produced by said filed winding is effective to either reinforce or to oppose the magnetic flux created by said permanent magnet within said magnetic gap.
1 more element
A loudspeaker, comprising:
- a motor structure including a back plate, a top plate, a permanent magnet connected between said back plate and said top plate, and, a pole piece concentrically disposed within said top plate forming a magnetic gap therebetween within which magnetic flux is created by said permanent magnet;
- a frame having a first end connected to an upper suspension and a second end connected to said motor structure;
- a voice coil movable within said magnetic gap, said voice coil being connected to a diaphragm which extends between said voice coil and said upper suspension, said voice coil having an outer surface wrapped with a wire winding which is adapted to connect to a source of electrical energy, said voice coil producing a magnetic flux when energized with electrical energy which alternately opposes and reinforces said magnetic flux created by said permanent magnet within said magnetic gap;
- a magnetic flux control system adapted to connect to said source of electrical energy and including a field winding and a controller, said controller being manually adjustable to a desired setting to vary the level and polarity of electrical current supplied to said field winding so as to alter the magnetic flux produced by said field winding, said field winding being located within said motor structure in position such that said magnetic flux produced by said field winding is effective to either reinforce or to oppose the magnetic flux created by said permanent magnet within said magnetic gap.
1 more element
A loudspeaker, comprising:
- a motor structure including a back plate, a top plate, a pole piece connected to said back plate, a permanent magnet connected between said pole piece and said top plate and a pot wall concentrically disposed about said top plate forming a magnetic gap therebetween within which magnetic flux is created by said permanent magnet;
- a frame having a first end connected to an upper suspension and a second end connected to said motor structure;
- a voice coil movable within said magnetic gap, said voice coil being connected to a diaphragm which extends between said voice coil and said upper suspension, said voice coil having an outer surface wrapped with a wire winding which is adapted to connect to a source of electrical energy, said voice coil producing a magnetic flux when energized with electrical energy which alternately opposes and reinforces said magnetic flux created by said permanent magnet within said magnetic gap;
- a magnetic flux control system adapted to connect to said source of electrical energy and including a field winding and a controller, said controller being manually adjustable to a desired setting to vary the level of electrical current supplied to said field winding so as to alter the magnetic flux produced by said field winding, said field winding being located within said motor structure in position such that said magnetic flux produced by said field winding is effective to either reinforce or to oppose the magnetic flux created by said permanent magnet within said magnetic gap.
1 more element
A loudspeaker, comprising:
- a motor structure including a back plate, a top plate, a magnetic gap and a permanent magnet interposed between said back plate and top plate which creates magnetic flux within said magnetic gap;
- a frame having a first end connected to an upper suspension and a second end connected to said motor structure;
- a voice coil movable with said magnetic gap, said voice coil being connected to a diaphragm which extends between said voice coil and said upper suspension, said voice coil having an outer surface wrapped with a wire winding which is adapted to connect to a source of electrical energy, said voice coil producing a magnetic flux when energized with electrical energy which alternately opposes and reinforces said magnetic flux created by said permanent magnet within said magnetic gap;
- a field winding having opposed ends adapted to connect to said source of electrical energy including a positive terminal and a negative terminal, said field winding being located within said motor structure in position such that the magnetic flux produced by said field winding is effective to either reinforce or to oppose the magnetic flux created by said permanent magnet within said magnetic gap dependent on the connection of said opposed ends of said field winding to the terminals of said source of electrical energy;
- and
- a polarity reversal switch which is effective to change the polarity of the electrical current supplied to said field winding by said source of electrical energy.
3 more elements
The method of adjusting the motor strength of a loudspeaker comprising:
- (a) providing a motor structure having a magnetic gap within which magnetic flux is created by a permanent magnet, said motor structure including a voice coil having an outer surface wrapped with a wire winding connected to a source of electrical energy;
- (b) applying electrical energy to said voice coil from the source to produce a magnetic flux which alternately opposes and reinforces the magnetic flux created by said permanent magnet;
- (c) providing a field winding within said motor structure, and connecting the field winding to said source of electrical energy;
- (d) manually controlling the level of the electrical current supplied to the field winding so that the magnetic flux produced by the field winding is effective either to reinforce or to oppose the magnetic flux of the permanent magnet within the magnetic gap.
1 more element
Dependencies are inferred from the claim text.