Light source device

Details Light source device Light source device

2005-05-20

2008-10-14

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Delayed application of the discharge potential

C313S112000, C313S571000

Reexamination Certificate

active

07436121

ABSTRACT:
A light source device for a projector device having a discharge lamp with a silica glass discharge vessel containing a pair of opposed electrodes and at least 0.15 mg/mm3of mercury, a concave reflector which surrounds the discharge lamp and reflects light emitted from the discharge lamp in a given direction, and a power supply device which selectively supplies a first wattage and a lower second wattage, is provided with a reflection heating arrangement which, in operation of the discharge lamp with the lower second wattage, returns at least part of the light emitted by the discharge lamp in the direction of the discharge lamp, and in operation of the discharge lamp at the first, higher wattage returns less light than in operation with the second wattage in the direction of the discharge lamp.

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patent: 4467238 (1984-08-01), Silverstein et al.
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patent: 1558016 (1979-12-01), None
European Search Report dated Jan. 14, 2008 for EP 05 01 0855.

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