Method and device for lighting high pressure discharge lamps

Details Method and device for lighting high pressure discharge lamps Method and device for lighting high pressure discharge lamps

2005-07-05

2005-07-05

Wong, Don (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

C315S291000

Reexamination Certificate

active

06914393

ABSTRACT:
Improved method and device for lighting a high pressure discharge lamp are provided which prevent arc jump and inhibit deterioration of lamp voltage and luminance. The method includes the step of: alternately repeating a superposition operation for superposing a pulse current on a lamp current applied to the high pressure discharge lamp for a predetermined time period and a superposition stopping operation for stopping the superposition of the pulse current for a predetermined time period.

REFERENCES:
patent: 4665346 (1987-05-01), Tarroux
patent: 5485061 (1996-01-01), Ukita et al.
patent: 6291945 (2001-09-01), Toyama et al.
patent: 6392364 (2002-05-01), Yamamoto et al.
patent: 6700335 (2004-03-01), Prasad
patent: 6747422 (2004-06-01), Yamamoto et al.
patent: WO 95/35645 (1995-12-01), None

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