Ultrasonic wave nebulizer driving circuit
AssigneeTDK Electronics Co., Ltd.
InventorMinoru Takahashi
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Abstract
Positive feedback is applied from the piezo-electric vibrator in an ultrasonic nebulizer to the control electrode in the oscillator circuit for improved performance.
Claims9
In an ultrasonic nebulizer driving circuit that includes an oscillator for generating a high frequency signal to energize a piezo-electric vibrator that generates ultrasonic waves, said oscillator including a control element having a control electrode, means including a bias resistor for supplying a biasing current to said control electrode, the improvement comprising a positive feedback circuit to feed back a part of said high frequency signal to said control electrode independent of said bias resistor to supplement said biasing current and concomitantly enable said bias resistor to be reduced in wattage.
Dependencies are inferred from the claim text.