High-pressure discharge lamp with stabilized arc

Details High-pressure discharge lamp with stabilized arc High-pressure discharge lamp with stabilized arc

1988-07-06

1990-03-06

Wieder, Kenneth

Electric lamp and discharge devices

With gas or vapor

Having particular electrode structure

313633, 313311, 313336, H01J 61073

Patent

active

049068954

ABSTRACT:
To improve the arc stability of a high-pressure arc discharge lamp, typically a xenon arc lamp, the cathode (4) has an essentially conical end portion (9), terminating in a roughly flat, or slightly rounded tip (10). The cathode is covered with a carbide layer (11) decreasing in thickness towards the tip (10) and, preferably, leaving a zone (12) adjacent the tip and extending over about one-third of the end zone (9) free from carbide. The carbide has a lower melting temperature than the tungsten of the electrode, and leaving the tip free from carbide prevents deterioration of the electrode due to melting of the carbide material, in operation of the lamp.

REFERENCES:
patent: 3054014 (1962-09-01), Gemsa
"Materials for Scientific Research", vol. 10 (12/1975), pp. 295 et seq., singer et al.

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