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US 5,815,884 AGranted
Dust indication system for vacuum cleaner
AssigneeYashima Electric Co., Ltd.
InventorsNobuo Imamura, Jun Yoshikawa
Life of this patent
Estimating the term…
Abstract
A vacuum cleaner includes an optical dust sensor for detecting a quantity of dust which sensor is provided at a predetermined position of a suction path for sucking air by a suction force of the vacuum cleaner, whereby an output signal is supplied to a display device so that a display corresponding to the quantity of the sucked dust, which signal is output from the optical dust sensor and is varied in a stageless manner corresponding to the quantity of the dust.
Claims22
A dust indication system for a vacuum cleaner, comprising;
- an optical dust sensor for optically detecting a quantity of dust suctioned through a suction path of a vacuum cleaner, and for outputting a detection signal corresponding to an amount of detected dust;
- an amplifier circuit for amplifying the detection signal from the optical dust sensor;
- a rectifying circuit for rectifying the amplified detection signal;
- a voltage-current convertor circuit for producing a current proportional to a voltage of the rectified amplified detection signal;
- and
- a display responsive to the current produced by the voltage-current convertor circuit for visually indicating a quantity of dust detected by the optical dust sensor, the optical dust sensor, the amplifier circuit, the rectifying circuit and the voltage-current convertor circuit operating together such that the current produced by the voltage-current convertor circuit varies continuously in correspondence to the quantity of dust detected by the optical dust sensor.
3 more elements
Dependencies are inferred from the claim text.