Patent ID: 6147461
Filing Date: 2000-11-14
Classification: H05B,Y02B,Y10S

Abstract:
An operating apparatus of a discharge lamp for operating the discharge lamp having an arc tube defining a discharge space, comprising:generation means for generating a first waveform signal having a frequency component of an acoustic resonance frequency exciting a mode which straightens an arc discharge, a center line of a waveform of the first waveform signal being maintained at a fixed level; andmodulation means for modulating the first waveform signal periodically so that a polarity of the center line of the first waveform signal changes alternately at a modulation frequency which is lower than the acoustic resonance frequency, and generating a modulated signal,wherein a modulation depth .alpha./.beta., where .alpha. is a peak-to-peak amplitude of the first waveform signal and .beta. is an effective value of an amplitude of the modulated signal, is set at such a value that a sealed material in the arc tube is prevented from adhering to a center portion of the arc tube in substantially a strip shape.