Emission device for an ultra-high pressure mercury lamp

Details Emission device for an ultra-high pressure mercury lamp Emission device for an ultra-high pressure mercury lamp

2006-10-17

2006-10-17

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices

With gas or vapor

Having a particular total or partial pressure

C313S578000, C313S579000, C313S620000

Reexamination Certificate

active

07122960

ABSTRACT:
An emission device for an ultra-high pressure mercury lamp which maintains an electrode tip shape by which a stable discharge can always be carried out is achieved for a short arc ultra-high pressure mercury lamp with silica glass arc tube containing a pair of opposed electrodes spaced apart a distance of at most 2 mm and in which the arc tube is filled with at least 0.15 mg/mm3of mercury, a rare gas and a halogen in the range from 1×10−6μmole/mm3to 1×10−2μmole/mm3; by providing an operating device which produces a current feed by which the surface of the tip of at least one of the electrodes is shifted into a molten state during lamp operation.

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patent: 2003/0184230 (2003-10-01), Nishida

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