High pressure sodium lamp containing barium getter

Details High pressure sodium lamp containing barium getter High pressure sodium lamp containing barium getter

1978-09-25

1982-06-01

Segal, Robert

Electric lamp and discharge devices

With magnetic device

Field transverse to discharge

316 24, H01J 1970, H01J 6124

Patent

active

043330320

ABSTRACT:
A high pressure sodium lamp comprises an elongated arc tube within an evacuated outer jacket, the arc tube containing a fill including sodium and mercury. A barium getter film is disposed on the inner jacket wall at one end thereof. The film is longitudinally spaced more than 1 cm away from the end of the arc tube in order to reduce photoelectron emission from the barium which can cause sodium migration from the arc tube.

REFERENCES:
patent: 3519864 (1970-07-01), Gungle et al.
patent: 3753018 (1973-08-01), Beijer et al.
patent: 3780331 (1973-12-01), Knochel et al.
patent: 3882346 (1973-05-01), McVey
patent: 4025812 (1977-05-01), McVey

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