PROBLEM TO BE SOLVED: To provide an ion generator which can prevent noise arising from electric discharge from becoming offensive to ears.SOLUTION: When an ambient noise level is lower than a prescribed threshold, a voltage that is obtained by subtracting a reduction voltage calculated according to a difference between the noise level and the prescribed threshold from 9 V, is made a direct-current voltage, so that the amplitude of an oscillation voltage applied to the discharge electrode of the ion generator is controlled to become large or small according to the height of the noise level. Or, when the ambient noise level is lower than a prescribed threshold, a frequency that is obtained a reduction frequency calculated according to a difference between the noise level and the prescribed threshold from 250 Hz, is made a thyristor turn-on repetition frequency, so that the frequency of an alternating-current voltage applied to the discharge electrode is controlled to become high or low according to the height of the noise level.COPYRIGHT: (C)2013,JPO&INPIT【課題】放電に伴う騒音が耳障りとならないようにすることが可能なイオン発生装置を提供する。【解決手段】周囲の騒音レベルが所定の閾値より低い場合、騒音レベルと所定の閾値との差分に応じて算出した低減電圧を9Vから減算した電圧を、直流電圧とすることにより、騒音レベルの高/低に応じて、イオン発生部の放電電極に印加する振動電圧の振幅が大/小となるように制御する。また、周囲の騒音レベルが所定の閾値より低い場合、騒音レベルと所定の閾値との差分に応じて算出した低減周波数を250Hzから減算した周波数を 、サイリスタのターンオンの繰り返し周波数とすることにより、騒音レベルの高/低に応じて、放電電極に印加する交流電圧の周波数が高/低となるように制御する。【選択図】図9
