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US 6,549,637 B1Granted
Loudspeaker with differential flow vent means
AssigneePeavey Electronics Corporation
InventorJon M. Risch
Life of this patent
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AssigneePeavey Electronics Corporation
InventorJon M. Risch
Estimating the term…
Differential flow vents allow airflow within a vent to be preferential. A flange disposed within a vent introduces non-linearities and causes a preferred direction of airflow into an expanding volume. The differential flow vents are used in conjunction with the natural motion of the loudspeaker cone acting as a pump to cool the loudspeaker cabinet enclosure without having to directly cool the woofer magnet structure. In one embodiment, at least one pair of opposed differential flow vents within the cabinet enclosure provide fresh air to be preferentially circulated to cool the interior of a loudspeaker system. In another embodiment, by providing an odd number of opposed differential flow vents within the cabinet enclosure, positive air circulation also results. By making either the pairs or odd number of differential flow vents to be asymmetrical, dynamic woofer offset is compensated. By placing the differential flow vents in the backplate of the woofer magnet structure and using the natural motion of the woofer speaker cone acting as a pump, cabinet enclosed air may be preferentially pumped into the magnet structure for cooling heated components. By providing the differential flow vents in both the cabinet enclosure and in the backplate of the woofer magnet structure, maximal cooling is achieved. Where system linearity is not an issue, pairs of opposed symmetrical differential flow vents may be used in the cabinet enclosure and or woofer magnet structure for cooling.
A loudspeaker device with differential flow vent means comprising an enclosure and a loudspeaker assembly, said enclosure being substantially closed to define an interior space for substantially encompassing said loudspeaker assembly within said space, differential flow vent means providing communication between said space and ambient air, said flow vent means defining a first cross-sectional area and a second cross-sectional area smaller than said first cross-sectional area for producing a greater resistance to airflow in one direction from said second cross-sectional area to said first cross-sectional area than in the opposite direction.
A loudspeaker device with differential flow vent means comprising an enclosure and a loudspeaker assembly, said enclosure being substantially closed to define an interior space for substantially encompassing said loudspeaker assembly within said space, a pair of differential flow vents, one of said vents providing greater resistance to airflow from ambient air into said space, and the other of said vents providing greater resistance to airflow from said space to ambient air, the resistance to airflow of one of said vents being greater than that of the other of said vents.
A loudspeaker device with differential flow vent means comprising an enclosure and a loudspeaker assembly, said enclosure being substantially closed to define an interior space for substantially encompassing said loudspeaker assembly within said space, a pair of differential flow vents, one of said vents providing greater resistance to airflow from ambient air into said space, and the other of said vents providing greater resistance to airflow from said space to ambient air, and an additional differential flow vent providing greater resistance to airflow from ambient air into said space.
A loudspeaker device with differential flow vent means comprising an enclosure and a loudspeaker assembly, said enclosure being substantially closed to define an interior space for substantially encompassing said loudspeaker assembly within said space, a pair of differential flow vents, one of said vents providing greater resistance to airflow from ambient air into said space, and the other of said vents providing greater resistance to airflow from said space to ambient air, and an additional differential flow vent providing greater resistance to airflow from said space into said ambient air.
A speaker assembly with differential flow vent means comprising a speaker cone having a central axis, a generally annular electrical winding supported by the speaker cone and forming a voice coil for vibrating the speaker cone, a pole piece positioned coaxially of said voice coil, a magnet structure cooperable with the pole piece for driving said speaker cone in response to electrical signals applied to the coil, said pole piece and said magnet structure defining an air chamber therebetween, a backplate for supporting the magnet structure and pole piece having a first surface exterior to the air chamber and a second surface opposite the first surface in communication with the interior of the air chamber, and differential flow vent means disposed within said backplate to provide communication between the air chamber and the exterior of said assembly, said differential flow vent means comprising a plurality of elongated passages extending through the back plate between the first and second surfaces, and being disposed substantially parallel to said central axis, each of said passages having a differential flow vent therein, one of said vents providing greater resistance to airflow from the exterior of said assembly into said chamber, and the other of said vents providing greater resistance to airflow from said chamber to the exterior of said assembly.
A loudspeaker device with differential flow vent means comprising an enclosure, said enclosure being substantially closed to define an interior space, first differential flow vent means comprising a pair of differential flow vents, one of said vents providing greater resistance to airflow from ambient air into said space, and the other of said vents providing greater resistance to airflow from said space to ambient air, the resistance to airflow of one of said vents being greater than that of the other of said vents, a speaker assembly supported within said space, said woofer assembly including a speaker cone having a central axis, a generally annular electrical winding support by the speaker cone and forming a voice coil for vibrating the speaker cone, a pole piece positioned coaxially of said voice coil, a magnet structure cooperable with the pole piece for driving said speaker cone in response to electrical signals applied to the coil, said pole piece and said magnet structure defining an air chamber therebetween, a backplate for supporting the magnet structure and pole piece, and second differential flow vent means disposed within said backplate to provide communication between the air chamber and said space, said second differential flow vent means comprising a pair of elongated passages and being disposed substantially parallel to said central axis, each of said passages having a differential flow vent therein, one of said vents of said passages providing greater resistance to airflow from said space into said chamber, and the other of said vents of said passages providing greater resistance to airflow from said chamber to said space.
A loudspeaker device with differential flow vent means comprising an enclosure, said enclosure being substantially closed to define an interior space, first differential flow vent means comprising a pair of differential flow vents, one of said vents providing greater resistance to airflow from ambient air into said space, and the other of said vents providing greater resistance to airflow from said space to ambient air, and an additional differential flow vent providing greater resistance to airflow from ambient air into said space, a speaker assembly supported within said space, said woofer assembly including a speaker cone having a central axis, a generally annular electrical winding supported by the speaker cone and forming a voice coil for vibrating the speaker cone, a pole piece positioned coaxially of said voice coil, a magnet structure cooperable with the pole piece for driving said speaker cone in response to electrical signals applied to the coil, said pole piece and said magnet structure defining an air chamber therebetween, a backplate for supporting the magnet structure and pole piece, and second differential flow vent means disposed within said backplate to provide communication between the air chamber and said space, said second differential flow vent means comprising a pair of elongated passages and being disposed substantially parallel to said central axis, each of said passages having a differential flow vent therein, one of said vents of said passages providing greater resistance to airflow from said space into said chamber, and the other of said vents of said passages providing greater resistance to airflow from said chamber to said space.
A loudspeaker device with differential flow vent means comprising an enclosure, said enclosure being substantially closed to define an interior space, first differential flow vent means comprising a pair of differential flow vents, one of said vents providing greater resistance to airflow from ambient air into said space, and the other of said vents providing greater resistance to airflow from said space to ambient air, and an additional differential flow vent providing greater resistance to airflow from said space into said ambient air, a speaker assembly supported within said space, said woofer assembly including a speaker cone having a central axis, a generally annular electrical winding supported by the speaker cone and forming a voice coil for vibrating the speaker cone, a pole piece positioned coaxially of said voice coil, a magnet structure cooperable with the pole piece for driving said speaker cone in response to electrical signals applied to the coil, said pole piece and said magnet structure defining an air chamber therebetween, a backplate for supporting the magnet structure and pole piece, and second differential flow vent means disposed within said backplate to provide communication between the air chamber and said space, said second differential flow vent means comprising a pair of elongated passages and being disposed substantially parallel to said central axis, each of said passages having a differential flow vent therein, one of said vents of said passages providing greater resistance to airflow from said space into said chamber, and the other of said vents of said passages providing greater resistance to airflow from said chamber to said space.
Dependencies are inferred from the claim text.