Importance

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Abstract

An ultrasonic atomizing device comprising a piezoelectric vibrator, at least an interdigital transducer P comprising two parts P.sub.D and P.sub.F, at least an electrode G, electrode terminals T.sub.D, T.sub.F and T.sub.G formed on the parts P.sub.D, P.sub.F and electrode G, respectively, a vibrating plate connected to the piezoelectric vibrator, a self-oscillator circuit, and means for dispensing a liquid to the vibrating plate. The interdigital transducer P and the electrode G are formed on two end surfaces of the piezoelectric vibrator, respectively. When an electric signal with a frequency substantially equal to one of the resonance frequencies of the piezoelectric vibrator is applied to the piezoelectric vibrator through the electrode terminals T.sub.D and T.sub.G, the piezoelectric vibrator is vibrated acoustically. The acoustic vibration is not only transmitted to the vibrating plate, but also transduced to an electric signal between the electrode terminals T.sub.F and T.sub.G. The acoustic vibration transmitted to the vibrating plate is consumed for liquid atomization effectively. The voltage between the electrode terminals T.sub.F and T.sub.G, that arises from the piezoelectricity of the piezoelectric vibrator is fedback, and again, applied to the electrode terminals T.sub.D and T.sub.G, which is essential for supplying the mechanical vibration energy for liquid atomization. The self-oscillator circuit is confirmed to work for continuous, stable liquid atomization without special compensation, for considerably large resonance frequency deviation of the piezoelectric vibrator.

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