High pressure sodium vapor discharge device

Details High pressure sodium vapor discharge device High pressure sodium vapor discharge device

1986-12-16

1989-02-21

Moore, David K.

Electric lamp and discharge devices

With gas or vapor

Having particular electrode structure

313633, 313558, H01J 1704, H01J 1724

Patent

active

048068268

ABSTRACT:
A high pressure sodium vapor discharge device including a polycrystalline alumina arc tube which contains a fill including sodium and mercury is disclosed. An electrode is disposed at each end of the arc tube, and an emissive material including an oxygen getter, such as, zirconium and/or niobium, and thorium dioxide is coated on at least one of the electrodes. The improved emissive material coating reduces the rate of sodium loss from the arc tube and inhibits loss of luminosity due to discoloration of the arc tube.

REFERENCES:
patent: 2304412 (1942-12-01), Kern et al.
patent: 2731581 (1956-01-01), Krefft
patent: 3700951 (1972-10-01), Clarke et al.
patent: 4303846 (1981-12-01), Kimura et al.
patent: 4366410 (1982-12-01), Buhrer
patent: 4574219 (1986-03-01), Davenport et al.
patent: 4620129 (1986-10-01), Luthra

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