Mercury lamp of the short arc type having an electrode terminal

Details Mercury lamp of the short arc type having an electrode terminal Mercury lamp of the short arc type having an electrode terminal

1995-11-29

1998-01-27

O'Shea, Sandra L.

Electric lamp and discharge devices

With gas or vapor

Having specified electrode spacing

313631, 313621, H01J 6104

Patent

active

057125309

ABSTRACT:
A mercury lamp of the short arc type in which tantalum can absorb impurity gases to a sufficient degree even if the inside of the arc tube reaches a high temperature is achieved by providing an arc tube, within which mercury and an inert gas are encapsulated, with a pair of electrodes disposed opposite each other within the arc tube, each of the electrodes being supported by a respective terminal post, tantalum being provided on the terminal post of one of the electrodes, and by ensuring that both of the relationships (D2/D1)>1.3 and the relationship 0.2.ltoreq.(D2/D1).sup.2 /L.ltoreq.0.5 are satisfied at the same time, where D1 is an outer diameter of the terminal post in millimeters, D2 is an outer diameter of the electrode supported by the respective terminal post in millimeters, and L is a distance between a tip of the electrode on which the tantalum is provided and the tantalum on the terminal post of that electrode.

REFERENCES:
patent: 2714687 (1955-08-01), Isaacs et al.
patent: 3517248 (1970-06-01), Eckel
patent: 3621322 (1971-11-01), Rehmet
patent: 4937496 (1990-06-01), Neiger et al.
patent: 4988918 (1991-01-01), Mori et al.
patent: 5422539 (1995-06-01), Chodora
patent: 5481159 (1996-01-01), Hiramoto et al.

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