Planar speaker with damping to reduce noise
AssigneeDell Products L.P.
InventorsChien Yu Huang, Cola Hung Shih
Life of this patent
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Abstract
In some examples, a computing device may include one or more planar speakers. Individual planar speakers may include damping material adhered to either a top surface of a front pole or a bottom surface of a cone. The damping material may reduce a noise caused by the cone hitting the front pole (e.g., when reproducing loud passages in media content) to an inaudible (e.g., 30 db or less) level. The noise may be reduced by up to 35 decibels between about 250 Hertz to about 450 Hertz. The damping material may comprise a polyurethane foam and may have a height of between about 0.1 millimeters to about 1.0 millimeters and preferably about 0.2 millimeters.
Claims17
A planar speaker comprising:
- a cone;
- a surround attached to an outer edge of the cone;
- a magnet;
- a voice coil comprising multiple windings placed around the magnet, the voice coil attached to a bottom of the cone;
- a front pole mounted on a top surface of the magnet and below the cone;
- and
- damping material that is adhered to a top surface of the front pole;
- wherein playing back content that causes the cone to move towards the front pole causes the rear surface of the cone to come in contact with the damping material, and wherein the cone has an asymmetric excursion caused in part by the damping material.
A planar speaker comprising:
- a cone;
- a surround attached to an outer edge of the cone;
- a magnet;
- a voice coil comprising multiple windings placed around the magnet, the voice coil attached to a bottom of the cone;
- a front pole mounted on a top surface of the magnet and below the cone;
- and
- damping material that is adhered to a bottom surface of the cone;
- wherein playing back content that causes the cone to move towards the front pole causes the damping material to come in contact with the front pole, and wherein the cone has an asymmetric excursion caused in part by the damping material.
A computing device comprising:
- one or more processors;
- one or more non-transitory computer-readable storage media to store instructions that are executable by the one or more processors and to store media content;
- and
- a planar speaker comprising:
- a cone;
- a surround attached to an outer edge of the cone;
- a magnet;
- a voice coil comprising multiple windings placed around the magnet, the voice coil attached to a bottom of the cone;
- a front pole mounted on a top surface of the magnet and below the cone;
- and
- damping material that is located between a rear surface of the cone and a top surface of the front pole;
- wherein:
- playing back the media content using the planar speaker causes the cone to move towards the front pole;
- and
- the damping material reduces a noise caused by the rear surface of the cone contacting the top surface of the front pole, causing the cone to have an asymmetric excursion.
Dependencies are inferred from the claim text.