Electric lamp and discharge devices: systems – Discharge device load
Reexamination Certificate
2009-03-10
2011-10-25
Owens, Douglas W (Department: 2821)
Electric lamp and discharge devices: systems
Discharge device load
C315S291000, C315S2090SC
Reexamination Certificate
active
08044613
ABSTRACT:
A discharge lamp lighting device includes: a power control circuit outputting DC current; an AC conversion circuit generating and outputting discharge lamp driving AC current by inverting the polarity of the DC current at a predetermined timing; a control circuit performing an AC conversion control process of controlling a polarity inversion timing of the discharge lamp driving AC current on the AC conversion circuit and performing an interval current control process of controlling a current value of the DC current every polarity inversion timing interval on the power control circuit; a detection unit detecting a discharge lamp driving voltage at the time of normal lighting; a history information storage periodically storing history information of the detected discharge lamp driving voltage, a statistics processing unit statistically processing the stored history information every predetermined period; and a statistical information storage storing information having been subjected to the statistical process as statistical information. Here, the control circuit sets and controls at least one of a frequency, a duty ratio, and a waveform of the discharge lamp driving AC current on the basis of a time-dependent tendency of the statistical information.
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Okawa Kazuo
Takezawa Takeshi
Terashima Tetsuo
Yamauchi Kentaro
Chen Jianzi
Oliff & Berridg,e PLC
Owens Douglas W
Seiko Epson Corporation
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