| 摘要 |
PROBLEM TO BE SOLVED: To provide a vacuum cleaner that is adaptable for determining whether dust inside a dust collection chamber reaches an upper limit or not. SOLUTION: The vacuum cleaner has an optoelectronic element 22 of an infrared ray sensor 20, which has a light-frequency converter (not illustrated) that converts light intensity received into a signal of a frequency corresponding to the intensity. A control device Z detects whether the dust collected in the chamber 11 reaches the upper limit H or not based on the frequency of the signal input from the sensor 20. COPYRIGHT: (C)2009,JPO&INPIT
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