High luminance electrodeless projection lamp

Details High luminance electrodeless projection lamp High luminance electrodeless projection lamp

1997-08-11

2000-01-18

Patel, Nimeshkumar D.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313634, 313637, 313638, 313 35, 315248, 315344, 220 21R, H01J 162, H01J 6304, H01J 1716, H01J 6130

Patent

active

060160314

ABSTRACT:
An Electrodeless High Intensity Discharge (EHID) lamp for projection applications. The lamp has a small (nominal dimensions: 2 mm I.D., 3 mm O.D., 6 mm internal length) capsule, which is constricted in a mid-portion thereof. The constriction squeezes the plasma within the capsule and provides a higher power density. This in turn produces a higher luminance in the center of the arc. This focal point of the projection system is constant over the life of the lamp, owing to the fact that the system is electrodeless. The arc tube or capsule is thickened in the vicinity of the constriction to permit heat transfer through the vitreous silica (commonly called quartz). The thickening carries the heat away from the now hotter mid-portion area. This thickening cools by virtue of increasing the thermal conduction through the glass.

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