Vacuum cleaner
First Claim
1. A vacuum cleaner capable of producing a variable suction force, comprising:
- a dust sensor for detecting a quantity of dust being sucked by said vacuum cleaner and producing an output signal representative of a quantity of dust detected;
electrical energy generating means for generating a voltage representative of a suction force produced by said vacuum cleaner;
amplifying means for amplifying said output signal by a gain;
gain controlling means for varying said gain by which said amplifying means amplifies said output signal in response to a change in voltage generated by said electrical energy generating means.
1 Assignment
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Accused Products
Abstract
A vacuum cleaner rotates a propeller fan by its suction force. The propeller fan rotates a rotor of a d.c. electric energy generator so as to generate electrical energy, and a d.c. voltage corresponding to the suction force is obtained by the generation. The vacuum cleaner employs the d.c. voltage as an operating voltage for a dust sensor and the peripheral circuitry thereof. The vacuum cleaner compares the d.c. voltage with a constant voltage output from a constant-voltage circuit by a comparing circuitry. The vacuum cleaner lowers the gain of an amplifying circuitry based upon a signal output from the comparing circuitry in correspondance to an increasing of the d.c. voltage obtained by the d.c. electric energy generator. The amplifying circuitry amplifies output of the dust sensor. The vacuum cleaner automatically determines detection sensitivity to be a proper sensitivity. The detection sensitivity is the sensitivity for detecting dust, based upon an output from the dust sensor.
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Citations
6 Claims
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1. A vacuum cleaner capable of producing a variable suction force, comprising:
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a dust sensor for detecting a quantity of dust being sucked by said vacuum cleaner and producing an output signal representative of a quantity of dust detected; electrical energy generating means for generating a voltage representative of a suction force produced by said vacuum cleaner; amplifying means for amplifying said output signal by a gain; gain controlling means for varying said gain by which said amplifying means amplifies said output signal in response to a change in voltage generated by said electrical energy generating means. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification