Methods and apparatus for operating very high pressure short...

Details Methods and apparatus for operating very high pressure short... Methods and apparatus for operating very high pressure short...

2008-01-29

2008-01-29

Vu, David H. (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S307000, C315SDIG002

Reexamination Certificate

active

07323824

ABSTRACT:
Methods and apparatus are provided for operating very high pressure short arc mercury discharge lamps primarily used for projection applications. The method includes controlling an alternating lamp current supplied to the lamp at a constant RMS value. In some embodiments, the lamp current is adjusted to a new constant RMS value to maintain lamp power between an upper power limit and a lower power limit. In other embodiments, lamp cooling is adjusted to maintain a wall temperature of the arc tube below a softening temperature.

REFERENCES:
patent: 5572094 (1996-11-01), Yamashita et al.
patent: 5608294 (1997-03-01), Derra et al.
patent: 6153987 (2000-11-01), Toda et al.
patent: 6232725 (2001-05-01), Derra et al.
patent: 6239556 (2001-05-01), Derra et al.
patent: WO 2004/002200 (2003-12-01), None

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