Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate
2011-08-16
2011-08-16
Cho, James (Department: 2819)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
C315S297000, C315S247000
Reexamination Certificate
active
07999490
ABSTRACT:
A light source includes an arc tube having a first electrode and a second electrode that emit light by discharge between the electrodes, and a driving unit that supplies a current between the first electrode and the second electrode and can change at least a waveform of frequency and waveform of the supplied current. The driving unit can perform lighting drive of the arc tube, using a driving waveform formed by combining a first lighting waveform having a maximum current value at a part other than a half-cycle rear end of the waveform and a second lighting waveform having a maximum current value at the half-cycle rear end of the waveform.
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Kimura Keishi
Okawa Kazuo
Takezawa Takeshi
Terashima Tetsuo
Yamauchi Kentaro
Cho James
Oliff & Berridg,e PLC
Seiko Epson Corporation
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