Light source device having a discharge lamp with high...

Details Light source device having a discharge lamp with high... Light source device having a discharge lamp with high...

2006-03-21

2006-03-21

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S2090SC, C315S291000, C315S360000

Reexamination Certificate

active

07015651

ABSTRACT:
To eliminate the disadvantage that the lamp current becomes large in a light source device with a discharge lamp with high radiance in a lamp with a low saturation lamp voltage, in a light source device having a discharge lamp with a pair of opposed electrodes connected to a feed device which starts the discharge lamp and which is used to supply the discharge current to the electrodes, the feed device is made to control the current feed such that the current flowing in the discharge lamp does not exceed a given current boundary value, such that, during the interval immediately after starting of the discharge lamp until sufficient heating of the discharge lamp is achieved, the current boundary value is a first boundary value, and that, after the interval expires, the current boundary value is changed to a second boundary value that is smaller than the first boundary value.

REFERENCES:
patent: 4240009 (1980-12-01), Paul
patent: 4289993 (1981-09-01), Harper et al.
patent: 5319286 (1994-06-01), Leyten
patent: 5705896 (1998-01-01), Choi
patent: 6049179 (2000-04-01), Kisaichi et al.
patent: 6313586 (2001-11-01), Yamamoto et al.
patent: 3261142 (2001-12-01), None

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