無電極放電灯点灯装置

Electrodeless discharge lamp lighting device

Abstract

【課題】間欠調光方式を用いた場合に、可聴音ノイズの発生を簡単に防止することができる無電極放電灯点灯装置を提供するものである。 【解決手段】内部に発光ガスを封入した発光体1と、この発光体1の近傍に配設された磁性体2と、半導体素子を含み高周波電力を発生する高周波電源4と、前記高周波電源4内の半導体素子を駆動するドライブ回路5と、前記発光体1の光出力を周期的に変化させる周期変化手段7と、前記磁性体2の周囲を巻回し前記高周波電源4に接続されたコイル6とからなる無電極放電灯点灯装置において、前記発光体1の光出力が周期的に変化する状態のそれぞれにおいて前記磁性体内の磁束密度が略一定となるように、周期変化手段7が前記ドライブ回路5の出力を変化させる。 【選択図】    図1
<P>PROBLEM TO BE SOLVED: To provide an electrodeless discharge lamp lighting device which can prevent audible noise easily when an intermittent light control method is used. <P>SOLUTION: The electrodeless discharge lamp lighting device comprises a light emitting body 1 in which light emitting gas is enclosed, a magnetic body 2 arranged near to the light emitting body 1, a high frequency power source 4 having a semiconductor element, generating high frequency, a driving circuit 5 driving the semiconductor element arranged in the high frequency power source 4, a period changing means 7 periodically changing the light output of the light emitting body 1, and a coil 6 coiled around the magnetic body 2 connected to the high frequency power source 4. The period changing means 7 changes the output of the driving circuit 5 so as to make the magnetic flux density in the magnetic body at respective state of periodic change of the light output of the light emitting body 1 almost constant. <P>COPYRIGHT: (C)2004,JPO

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