Metal halide lamp containing thi.sub.4 with added elemental...

Details Metal halide lamp containing thi.sub.4 with added elemental... Metal halide lamp containing thi.sub.4 with added elemental...

H - Electricity

01

J

313/137

H01J 61/26 (2006.01) H01J 61/12 (2006.01)

Patent

CA 1162971

LD 7867 METAL HALIDE LAMP CONTAINING ThI4.WITH ADDED ELEMENTAL CADMIUM OR ZINC ABSTRACT OF THE DISCLOSURE 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 oper- ation. By so doing, deposition of thorium on the elec- trode 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 ScI3 and ThI4, with the Si02 of the lamp envelope.

364558

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