摘要 |
<p>A dust sensing unit (10) for use in a vacuum cleaner (100), which can detect whether there is dust or dirt on a surface to be cleaned and inform a user of the detected result in cleaning, is disclosed. The dust sensing unit (10) includes a body (11) having an air flowing passage (14) therein to move air laden with dust or dirt drawn in through a suction nozzle (110), a detecting sensor (25) disposed on the air flowing passage to detect whether the dust or dirt is passing through the air flowing passage (14), a lamp part (45) to operate according to a signal outputted from the detecting sensor (25), a rotating part (35) disposed to the body (11) to rotate by air flowing through the air flowing passage (14), and an electric generator (55) rotated by the rotating part (35) to generate an electric power.</p> |