Light source, projector, and method of driving arc tube

Details Light source, projector, and method of driving arc tube Light source, projector, and method of driving arc tube

2007-10-30

2007-10-30

Vu, David H. (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S224000, C353S037000, C362S296040

Reexamination Certificate

active

11129378

ABSTRACT:
Aspects of the invention can relate to a light source that includes a light source lamp and an arc-tube drive unit. The light source lamp can include an arc tube that emits light between a pair of electrodes, a reflector that reflects the light from the arc tube to a region to be illuminated, and an auxiliary mirror that reflects the light emitted from the arc tube to the region to be illuminated toward the reflector. The arc-tube drive unit can drive the arc tube with an alternating current so that, of the pair of electrodes of the arc tube, the brightness of a first luminescent point generated in the vicinity of a first electrode adjacent to the auxiliary mirror is lower than the brightness of a second luminescent point generated in the vicinity of a second electrode remote from the auxiliary mirror.

REFERENCES:
patent: 4988918 (1991-01-01), Mori et al.
patent: 5491525 (1996-02-01), Yamasaki et al.
patent: 5589726 (1996-12-01), Gold
patent: A 06-289394 (1994-10-01), None
patent: A-09-120067 (1997-05-01), None
patent: A 11-143378 (1999-05-01), None

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