| 摘要 |
This electric vacuum cleaner has a vacuum cleaner main unit housing an electrically powered fan (18). The electric vacuum cleaner has an air trunk in communication with the suction side of the electrically powered fan (18). The electric vacuum cleaner is movable upon a surface to be cleaned, and has a floor brush (23) dividing a portion of the air trunk. The electric vacuum cleaner has an optical sensor (53) which detects the amount of dirt and dust passing within the air trunk as a result of operation of the electrically powered fan (18). The electric vacuum cleaner has a cleaning efficiency calculation unit (59) for calculating cleaning efficiency on the basis of the accumulated amount of the amount of dirt and dust which has been detected by the optical sensor (53), the amount of movement upon the surface to be cleaned of the floor brush (23), and the amount of time of the movement upon the surface to be cleaned of the floor brush (23). The electric vacuum cleaner has a display means (20) capable of displaying the cleaning efficiency which has been calculated by the cleaning efficiency calculation unit (59). |
