Projector using ballast controlled high-pressure discharge...

Details Projector using ballast controlled high-pressure discharge... Projector using ballast controlled high-pressure discharge...

2009-02-23

2011-10-25

Epps, Georgia Y (Department: 2878)

Optics: image projectors

Lamp control

Reexamination Certificate

active

08042953

ABSTRACT:
A projector includes: plural high-pressure discharge lamps; a high-pressure discharge lamp lighting device for lighting the plural high-pressure discharge lamps; a light combining system that combines and outputs lights from the plural high-pressure discharge lamps; an electro-optical modulation device that modulates the light from the light combining system according to image information; and a projection system that projects the light modulated by the electro-optical modulation device, wherein the high-pressure discharge lamp lighting device supplies alternating lamp currents having alternating-current waveforms with the same waveform and period and phases shifted by a predetermined amount with respect to each of the high-pressure discharge lamps to the respective plural high-pressure discharge lamps.

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patent: A-08-36180 (1996-02-01), None
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Jul. 12, 2010 European Search Report issued in Application No. EP 09 15 3414.

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