| 摘要 |
A vacuum cleaner introduces dust, as well as air, from a nozzle connected with the distal end of a hose into a dust collecting section in the cleaner body through an intake section, while detecting, by means of a detector, the volume of dust being introduced, and controls the output of an electric blower in accordance with the detected volume. One end of the intake section is connected with the proximal end of the hose, while the other end projects into the dust collecting section. fight-emitting and light-receiving elements are provided in the intake section to constitute the detector so as to enable positive detection of dust, easy checking of the contamination of the detector, and easy wiping of the detector.
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