Oscillator-exciting system for ultrasonic liquid nebulizer
First Claim
1. An oscillator-exciting system for an ultrasonic liquid nebulizer comprising a vessel containing liquid, a power source providing an electrical potential, a piezo-oscillator element disposed in said vessel, and a self-oscillating electric circuit connected across said power source potential and a reference potential, said self-oscillating circuit having said piezo-oscillator element connected thereto as a constituent element thereof, said oscillating circuit being adapted to oscillate at that frequency in which the electric impedance of said piezo-oscillator element is inductive, so as to nebulize the liquid by the oscillation of the piezo-oscillator element, said self-oscillating circuit including an oscillating transistor and a current-bias resistance connected between a base of the transistor and said power source potential, a second transistor having a collector-emitter circuit connected in series with at least a part of said current-bias resistance, a float magnet floating on the top surface of said liquid, and a reed switch disposed at the bottom of said vessel and aligned with said float magnet so as to be actuated by said float magnet in response to a lowering of the liquid below a predetermined level, said reed switch being connected between a base of said second transistor and said reference potential.
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Accused Products
Abstract
In an oscillator-exciting system for a ultrasonic liquid nebulizer, a piezo-oscillator element for nebulizing the liquid is electrically connected to a self-exciting oscillating circuit as a constituent element thereof and the circuit is oscillated at that frequency at which the electric impedance of the piezo-oscillator element is inductive. A protective transistor may be connected to a current-bias resistance of the oscillating circuit, which protective transistor may be cut off by a reed switch sensing the exhaustion of the liquid being nebulized and/or by an overcurrent sensing circuit, for ceasing the oscillation in case of liquid exhaustion and/or overcurrent.
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Citations
4 Claims
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1. An oscillator-exciting system for an ultrasonic liquid nebulizer comprising a vessel containing liquid, a power source providing an electrical potential, a piezo-oscillator element disposed in said vessel, and a self-oscillating electric circuit connected across said power source potential and a reference potential, said self-oscillating circuit having said piezo-oscillator element connected thereto as a constituent element thereof, said oscillating circuit being adapted to oscillate at that frequency in which the electric impedance of said piezo-oscillator element is inductive, so as to nebulize the liquid by the oscillation of the piezo-oscillator element, said self-oscillating circuit including an oscillating transistor and a current-bias resistance connected between a base of the transistor and said power source potential, a second transistor having a collector-emitter circuit connected in series with at least a part of said current-bias resistance, a float magnet floating on the top surface of said liquid, and a reed switch disposed at the bottom of said vessel and aligned with said float magnet so as to be actuated by said float magnet in response to a lowering of the liquid below a predetermined level, said reed switch being connected between a base of said second transistor and said reference potential.
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2. An oscillator-exciting system for a ultrasonic liquid nebulizer, comprising a vessel containing liquid, a power source providing an electrical potential, a piezo-oscillator element disposed in said vessel, and a self-oscillating electric circuit connected across said power source potential and a reference potential, said self-oscillating circuit having said piezo-oscillator element connected thereto as a constituent element thereof, said oscillating circuit being adapted to oscillate at that frequency in which the electric impedance of said piezo-oscillator element is inductive, so as to nebulize the liquid by the oscillation of the piezo-oscillator element, said self-oscillating circuit including an oscillating transistor and a current-bias resistance connected between a base of the transistor and said power source potential, a second transistor having a collector emitter circuit connected in series with at least a part of said current-bias resistance, a controlled rectifier having an anode-cathode circuit thereof connected between a base of said second transistor and said reference potential, and a means producing a voltage proportional to the load current of said self-oscillating circuit, said controlled rectifier having a gate connected to said voltage producing means so as to receive said voltage proportional to the load current for providing a low impedance path through said anode-cathode circuit in response to said load current exceeding a predetermined limit.
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3. An oscillator-exciting system for an ultrasonic liquid nebulizer, comprising a vessel containing liquid, a power source providing an electrical potential, a piezo-oscillator element disposed in said vessel, and a self-oscillating electric circuit connected across said power source potential and a reference potential, said self-oscillating circuit having said piezo-oscillator element connected thereto as a constituent element thereof, said oscillating circuit being adapted to oscillate at that frequency in which the electric impedance of said piezo-oscillator element is inductive, so as to nebulize the liquid by the oscillation of the piezo-oscillator element, said self-oscillating circuit including an oscillating transistor and a current-bias resistance connected between the base of the transistor and said power source potential, a second transistor having a collector-emitter circuit connected in series with at least a part of said current-bias resitance, a float magnet floating on the top surface of said liquid, a reed switch disposed at the bottom of said vessel in alignment with said float magnet so as to be actuated by said float magnet in response to a decrease in the liquid level below a predetermined level, said reed switch being connected between a base of said second transistor and said reference potential, a controlled rectifier having an anode-cathode circuit thereof connected between the base of said second transistor and said reference potential, and a means producing a voltage proportional to the load current of said self-oscillating circuit, said controlled rectifier having a gate connected to said means and receiving said voltage proportional to the load current for providing a low impedance path through said anode-cathode circuit in response to said load current exceeding a predetermined limit.
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4. An oscillator-exciting system for an ultrasonic liquid nebulizer, comprising a vessel containing liquid, a power source providing an electrical potential, a piezo-oscillator element disposed in said vessel, and a self-oscillating electric circuit connected across said power source potential and a reference potential, said self-oscillating circuit having said piezo-oscillator element connected thereto as a constituent element thereof, said oscillating circuit being adapted to oscillate at that frequency in which the electric impedance of said piezo-oscillator element is inductive, so as to nebulize the liquid by the oscillation of the piezo-oscillator element, a transformer electrically connected between said piezo-oscillator element and said oscillating circuit, said self-oscillating circuit including an oscillating transistor and a current-bias resistance connected between a base of the transistor and said power source potential, a second transistor having a collector-emitter circuit connected in series with at least a part of said current-bias resistance, a float magnet floating on the top surface of said liquid, and a reed switch disposed at the bottom of said vessel in alignment with said float magnet so as to be actuated by said float magnet in response to a lowering of the liquid level below a predetermined level said reed switch being connected betwee a base of said second transistor and said reference potential.
Specification