Electric cleaner

Abstract

An electric vacuum cleaner includes an electric blower, a driver for driving the electric blower, a determination controller for controlling the electric power supply to the electric blower by transmitting a signal to the driver, and a dust amount sensor for sensing the amounts of dusts of different sizes. The determination controller controls the electric power supply to the electric blower based on the amounts of dusts of the different sizes sensed by the dust amount sensor.

Description

TECHNICAL FIELD[0001]The present invention relates to electric vacuum cleaners for household use.BACKGROUND ART[0002]In recent years, there have been proposed vacuum cleaners with various features. One such feature is to control the electric blower by detecting the amount of dust using a dust sensor disposed in an air passage through which dust is collected (see, for example, Examined Japanese Patent Publication No. H07-28847 and Japanese Patent No. 3006145).[0003]In the conventional electric vacuum cleaners, the number and the sizes of dusts are determined by the number of pulses and the pulse width, respectively, of a detection signal. However, the sizes of the detectable dusts are found to be limited by the circuit characteristics of the pulse converter which detects the size of the dust from the pulse width.[0004]The reasons of the limitation are as follows. For one thing, house dusts which can be collected by a vacuum cleaner have a difference in area of several thousand times....

AI Technical Summary

Benefits of technology

[0006]In view of the above-described problems, the present invention has an object of providing an electric vacuum cleaner capable of controlling dusts of different sizes with high accuracy.

Problems solved by technology

However, the sizes of the detectable dusts are found to be limited by the circuit characteristics of the pulse converter which detects the size of the dust from the pulse width.

For one thing, house dusts which can be collected by a vacuum cleaner have a difference in area of several thousand times. Therefore, when the characteristics of the detection circuit (especially the amplification factor and frequency characteristics of the detection signal) are adjusted to small dusts, the number of pulses of the signal can be detected but the pulse width is difficult to determine with respect to large dusts.

In contrast, when the characteristics of the detection circuit are adjusted to large dusts, it is difficult to detect reaction with respect to small dusts.

In addition, the transit speed tends to be delayed with respect to the air intake speed.

This means that the conventional electric vacuum cleaners cannot efficiently control dusts of sizes other than the size to which the characteristics of the detection circuit have been adjusted.

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