Mercury lamp of the short arc type and method for operation ther

Details Mercury lamp of the short arc type and method for operation ther Mercury lamp of the short arc type and method for operation ther

1997-09-26

1999-07-06

Patel, Nimeshkumar D.

Electric lamp and discharge devices

With gas or vapor

Having a particular total or partial pressure

313570, 313642, 313632, H01J 1704

Patent

active

059201525

ABSTRACT:
A mercury lamp of the short arc type with high radiant efficiency which satisfies the demand for an increase of the radiation amount of the light source, by suppressing the motion of the bright spot in the vicinity of the cathode tip suppresses the flickering of the irradiance and thus increases the arc stability, is achieved in a mercury lamp of the short arc type in which within an arc tube mercury and at least one rare gas are encapsulated, by either at least Ar being filled as the rare gas at an filling pressure of from 1 to 8 atm, and by the current density in the tip area of the cathode being 10 to 250 A/mm.sup.2 or alternatively, at least Kr being filled as the rare gas at an filling pressure of from 1 to 8 atm, and the current density in the tip area of the cathode being 10 to 310 A/mm.sup.2 during operation of the lamp. By operation of the above described lamp in a vertical orientation with the anode positioned above the cathode a further contribution to the attainment of the noted advantages is achieved.

REFERENCES:
patent: 4190786 (1980-02-01), Kira
patent: 4704346 (1987-11-01), Hiramoto et al.
patent: 5723944 (1998-03-01), Higashi et al.

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