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US 11,240,592 B2Granted
Bass reflex port and acoustic device
AssigneeYamaha Corporation
InventorsAkira Miki, Hirofumi Onitsuka, Katsuya Uchida
Life of this patent
Estimating the term…
Abstract
An acoustic device includes an enclosure and a bass reflex port that includes a tube body. An inner wall surface of the tube body includes multiple regions in which viscous resistances in a tube axis direction of moving air and the inner wall surface are different. The multiple regions are provided along a circumferential direction of the inner wall surface. The tube body is attached to an opening area in the enclosure.
Claims20
A bass reflex port for an acoustic device, the bass reflex port comprising:
- a tubular body including at an inner wall surface thereof:
- a first plurality of regions arranged spaced apart along a circumferential direction thereof and extending in an axial direction of the tubular body, from an entrance end of the tubular body to an exit end of the tubular body, each of the first plurality of regions providing a first air viscous resistance in the axial direction;
- and
- a second plurality of regions arranged spaced apart along the circumferential direction and extending in the axial direction, from the entrance end to the exit end, each of the second plurality of regions providing a second air viscous resistance, which is less than the first air viscous resistance, in the axial direction,
- wherein a flow rate of air passing over the first plurality of regions decreases toward the exit end at a greater rate than a flow rate of air passing over the third and fourth regions decreasing toward the exit end, so that positions and timings at which first eddies occurring due to air separating from the first plurality of regions and second eddies occurring due to air separating from the second plurality of regions differ in the circumferential direction.
2 more elements
An acoustic device comprising:
- an enclosure provided with an opening;
- and
- a bass reflex port arranged in the enclosure and comprising a tubular body, the tubular body being fixed to the enclosure at the opening,
- wherein the tubular body includes at an inner wall surface thereof:
- a first plurality of regions arranged spaced apart along a circumferential direction thereof and extending in an axial direction of the tubular body, from an entrance end of the tubular body to an exit end of the tubular body, each of the first plurality of regions providing a first air viscous resistance in the axial direction;
- and
- a second plurality of regions arranged spaced apart along the circumferential direction and extending in the axial direction, from the entrance end to the exit end, each of the second plurality of regions providing a second air viscous resistance, which is less than the first air viscous resistance, in the axial direction,
- wherein a flow rate of air passing over the first plurality of regions decreases toward the exit end at a greater rate than a flow rate of air passing over the third and fourth regions decreasing toward the exit end, so that positions and timings at which first eddies occurring due to air separating from the first plurality of regions and second eddies occurring due to air separating from the second plurality of regions differ in the circumferential direction.
5 more elements
Dependencies are inferred from the claim text.