| 摘要 |
Disclosed are a ring-shaped dust quantity detector, a vacuum cleaner, and a method for detecting dust quantity. The dust quantity detector is attached to a tube positioned on a passage, where dust sucked from a predetermined device flows, to measure the quantity of the dust inside the tube, while including: a ring-shaped attaching portion; and a sensor portion having a light-emitting unit prepared on one side of the inner circumference of the attaching portion for emitting light, and a plurality of light-receiving units arranged on the other side of the inner circumference of the attaching portion at a predetermined interval, to output pattern information by measuring the intensity of received light. |
