Electric lamp and discharge devices – With support and/or spacing structure for electrode and/or... – For plural electrodes of discharge device
Patent
1979-04-26
1980-11-04
Demeo, Palmer C.
Electric lamp and discharge devices
With support and/or spacing structure for electrode and/or...
For plural electrodes of discharge device
313218, 313229, 313346R, H01J 61073, H01J 6109, H01J 6118
Patent
active
042322430
ABSTRACT:
In a high pressure electric discharge lamp having tungsten electrodes and a discharge envelope filling of mercury, rare gas, and metal halides, activator material consisting essentially of scandium oxide is incorporated in the electrodes, in the form of a solidified melt substantially filling a cavity in the electrode and adherent to the electrode structure, and the halides of the filling consist of iodide(s) and bromide(s), including scandium iodide and/or scandium bromide, in relative proportions such that the atomic ratio of total bromine to total iodine is 20:80 to 60:40. The electrodes are preferably tungsten wire coils, the scandium oxide filling the interior of the coil and penetrating into the interstices between the coil turns. The filling preferably includes sodium iodide and/or sodium bromide, and may include additional iodides and/or bromides. The combination of the scandium oxide activator and the bromide/iodide filling gives high luminous efficacy and good lumen maintenance.
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DeMeo Palmer C.
The General Electric Company Limited
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