Electric lamp and discharge devices: systems – Current and/or voltage regulation
Patent
1999-03-16
2000-11-14
Wong, Don
Electric lamp and discharge devices: systems
Current and/or voltage regulation
315307, 315DIG7, G05F 100
Patent
active
061474614
ABSTRACT:
An operating apparatus of a discharge lamp for operating the discharge lamp having an arc tube defining a discharge space includes: 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; and modulation 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. 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.
REFERENCES:
patent: 5198727 (1993-03-01), Allen et al.
patent: 5773937 (1998-06-01), Miyazaki et al.
patent: 5880561 (1999-03-01), Miyazaki et al.
Kominami Satoshi
Miyazaki Koji
Matsushita Electric - Industrial Co., Ltd.
Vo Tuyet T.
Wong Don
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