Mercury-free arc tube for discharge lamp unit

Details Mercury-free arc tube for discharge lamp unit Mercury-free arc tube for discharge lamp unit

2006-08-29

2006-08-29

Patel, Ashok (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Having particular electrode structure

C313S357000

Reexamination Certificate

active

07098596

ABSTRACT:
An arc tube for a discharge bulb is provided for use in a vehicular lighting system. The arc tube includes a closed glass bulb that is pinch-sealed at opposite ends. Inner ends of a first electrode and a second electrode extend into the closed glass bulbs from the ends of the closed glass bulb. The atmosphere inside the closed glass bulb includes a starting rare gas, a primary light-emitting metal halide, and optionally, a buffer metal halide. The distance between the inner ends of the electrodes is between about 0.3 and 1.8, and the inner diameter of the closed glass bulb at a middle portion is between about 1.5 mm and 2.7 mm. Accordingly, a stable discharge is produced using between 15 W and 30 W of power.

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