Electric lamp and discharge devices – Liquid electrode discharge devices – Auxiliary starting or holding electrode
Patent
1979-11-13
1982-11-23
Segal, Robert
Electric lamp and discharge devices
Liquid electrode discharge devices
Auxiliary starting or holding electrode
313229, 313228, H01J 1720, H01J 6122
Patent
active
043607560
ABSTRACT:
In a high intensity metal halide discharge lamp utilizing thorium in conjunction with a transport cycle for electrode activation, a getter, preferably cadmium or zinc is added to the lamp fill for the purpose of reducing the concentration of free iodine during operation. By so doing, deposition of thorium on the electrode tip during operation is assured and performance and maintenance are improved. The quantity of getter may include a portion supplied as a corrective measure to scavenge excess iodine released during manufacture, and another portion providing a long-term buffering capacity for capturing iodine released during the lamp's life by reaction of the dose, particularly ScI.sub.3 and ThI.sub.4, with the SiO.sub.2 of the lamp envelope.
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Bhattacharya Ashok K.
Spencer John E.
General Electric Company
Kempton Lawrence R.
Legree Ernest W.
Schlamp Philip L.
Segal Robert
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