Ultrasonic atomizer with automatic control circuit
First Claim
1. A method of energizing an ultrasonic atomizer for converting liquids to aerosols, said atomizer including a piezoelectric ultrasonic transducer having at least one passageway adapted for the passage of a liquid to be converted into an aerosol, said method comprising the step ofexciting the ultrasonic transducer to vibrate at its resonant frequency by applying thereto percussion-like pulses of high energy having a recurrence frequency which is a sub-multiple of said resonant frequency.
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Abstract
A method and a device for energizing piezo-electric ultra-sound transducers, wherein rectangular pulses of calibrated duration generate in an oscillation circuit of the transducer damped waves with a frequency equal to the natural frequency of the transducer and modulated at the recurrence frequency of the rectangular pulses.
59 Citations
4 Claims
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1. A method of energizing an ultrasonic atomizer for converting liquids to aerosols, said atomizer including a piezoelectric ultrasonic transducer having at least one passageway adapted for the passage of a liquid to be converted into an aerosol, said method comprising the step of
exciting the ultrasonic transducer to vibrate at its resonant frequency by applying thereto percussion-like pulses of high energy having a recurrence frequency which is a sub-multiple of said resonant frequency.
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2. An ultrasonic atomizer for converting liquids to an aerosol, said atomizer having an electrical oscillating circuit and a piezoelectric ultrasonic transducer having at least one passageway for the passage of a liquid to be atomized, said transducer being connected in said oscillating circuit and adapted to vibrate at its ultrasonic resonant frequency, said atomizer comprising
a square wave pulse generator coupled to said oscillating circuit for producing high amplitude, percussion-like rectangular pulses of calibrated duration having a recurrence frequency which is a sub-multiple of the resonant frequency of said transducer thereby producing a vibration of said transducer which is amplitude modulated by said percussion-like pulses; - and
a feedback circuit coupled between said oscillating circuit and said pulse generator, said feedback circuit including a frequency divider having a frequency dividing ratio corresponding to the ratio of the frequency of said pulses and the frequency of said oscillating circuit. - View Dependent Claims (3, 4)
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Specification